sysfs: make sysfs disconnect immediately from kobject on deletion

index 85a6686..5112f88 100644
@@ -504,19 +504,19 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 	struct sysfs_dirent * parent_sd = dentry->d_fsdata;
 	struct sysfs_dirent *cursor = filp->private_data;
 	struct list_head *p, *q = &cursor->s_sibling;
-	ino_t ino;
+	unsigned long ino;
 	int i = filp->f_pos;
 
 	switch (i) {
 		case 0:
-			ino = dentry->d_inode->i_ino;
+			ino = (unsigned long)parent_sd;
 			if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
 				break;
 			filp->f_pos++;
 			i++;
 			/* fallthrough */
 		case 1:
-			ino = parent_ino(dentry);
+			ino = (unsigned long)dentry->d_parent->d_fsdata;
 			if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
 				break;
 			filp->f_pos++;

@@ -538,10 +538,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 
 				name = sysfs_get_name(next);
 				len = strlen(name);
-				if (next->s_dentry)
-					ino = next->s_dentry->d_inode->i_ino;
-				else
-					ino = iunique(sysfs_sb, 2);
+				ino = (unsigned long)next;
 
 				if (filldir(dirent, name, len, filp->f_pos, ino,
 						 dt_type(next)) < 0)

index 4de5c6b..b8b010c 100644
@@ -140,6 +140,7 @@ struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent * sd)
 		inode->i_mapping->a_ops = &sysfs_aops;
 		inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
 		inode->i_op = &sysfs_inode_operations;
+		inode->i_ino = (unsigned long)sd;
 		lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
 
 		if (sd->s_iattr) {

index d3b9f5f..8273dd6 100644
@@ -33,16 +33,13 @@ fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
 }
 
 static ssize_t
-read(struct file * file, char __user * userbuf, size_t count, loff_t * off)
+read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
 {
 	char *buffer = file->private_data;
 	struct dentry *dentry = file->f_path.dentry;
 	int size = dentry->d_inode->i_size;
 	loff_t offs = *off;
-	int ret;
-
-	if (count > PAGE_SIZE)
-		count = PAGE_SIZE;
+	int count = min_t(size_t, bytes, PAGE_SIZE);
 
 	if (size) {
 		if (offs > size)

@@ -51,10 +48,9 @@ read(struct file * file, char __user * userbuf, size_t count, loff_t * off)
 			count = size - offs;
 	}
 
-	ret = fill_read(dentry, buffer, offs, count);
-	if (ret < 0) 
-		return ret;
-	count = ret;
+	count = fill_read(dentry, buffer, offs, count);
+	if (count < 0)
+		return count;
 
 	if (copy_to_user(userbuf, buffer, count))
 		return -EFAULT;

@@ -78,16 +74,15 @@ flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
 	return attr->write(kobj, buffer, offset, count);
 }
 
-static ssize_t write(struct file * file, const char __user * userbuf,
-		     size_t count, loff_t * off)
+static ssize_t write(struct file *file, const char __user *userbuf,
+		     size_t bytes, loff_t *off)
 {
 	char *buffer = file->private_data;
 	struct dentry *dentry = file->f_path.dentry;
 	int size = dentry->d_inode->i_size;
 	loff_t offs = *off;
+	int count = min_t(size_t, bytes, PAGE_SIZE);
 
-	if (count > PAGE_SIZE)
-		count = PAGE_SIZE;
 	if (size) {
 		if (offs > size)
 			return 0;

index 8273dd6..0f0027b 100644
@@ -23,7 +23,8 @@
 static int
 fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
 {
-	struct bin_attribute * attr = to_bin_attr(dentry);
+	struct sysfs_dirent *attr_sd = dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
 	struct kobject * kobj = to_kobj(dentry->d_parent);
 
 	if (!attr->read)

@@ -65,7 +66,8 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
 static int
 flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
 {
-	struct bin_attribute *attr = to_bin_attr(dentry);
+	struct sysfs_dirent *attr_sd = dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
 	struct kobject *kobj = to_kobj(dentry->d_parent);
 
 	if (!attr->write)

@@ -101,9 +103,9 @@ static ssize_t write(struct file *file, const char __user *userbuf,
 
 static int mmap(struct file *file, struct vm_area_struct *vma)
 {
-	struct dentry *dentry = file->f_path.dentry;
-	struct bin_attribute *attr = to_bin_attr(dentry);
-	struct kobject *kobj = to_kobj(dentry->d_parent);
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
+	struct kobject *kobj = to_kobj(file->f_path.dentry->d_parent);
 
 	if (!attr->mmap)
 		return -EINVAL;

@@ -114,7 +116,8 @@ static int mmap(struct file *file, struct vm_area_struct *vma)
 static int open(struct inode * inode, struct file * file)
 {
 	struct kobject *kobj = sysfs_get_kobject(file->f_path.dentry->d_parent);
-	struct bin_attribute * attr = to_bin_attr(file->f_path.dentry);
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
 	int error = -EINVAL;
 
 	if (!kobj || !attr)

@@ -150,7 +153,8 @@ static int open(struct inode * inode, struct file * file)
 static int release(struct inode * inode, struct file * file)
 {
 	struct kobject * kobj = to_kobj(file->f_path.dentry->d_parent);
-	struct bin_attribute * attr = to_bin_attr(file->f_path.dentry);
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
 	u8 * buffer = file->private_data;
 
 	kobject_put(kobj);

index 26c3088..d70ead5 100644
@@ -21,11 +21,10 @@ struct kobject *sysfs_get_kobject(struct dentry *dentry)
 	spin_lock(&dcache_lock);
 	if (!d_unhashed(dentry)) {
 		struct sysfs_dirent * sd = dentry->d_fsdata;
-		if (sd->s_type & SYSFS_KOBJ_LINK) {
-			struct sysfs_symlink * sl = sd->s_element;
-			kobj = kobject_get(sl->target_kobj);
-		} else
-			kobj = kobject_get(sd->s_element);
+		if (sd->s_type & SYSFS_KOBJ_LINK)
+			kobj = kobject_get(sd->s_elem.symlink.target_kobj);
+		else
+			kobj = kobject_get(sd->s_elem.dir.kobj);
 	}
 	spin_unlock(&dcache_lock);
 

@@ -39,11 +38,8 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
  repeat:
 	parent_sd = sd->s_parent;
 
-	if (sd->s_type & SYSFS_KOBJ_LINK) {
-		struct sysfs_symlink * sl = sd->s_element;
-		kobject_put(sl->target_kobj);
-		kfree(sl);
-	}
+	if (sd->s_type & SYSFS_KOBJ_LINK)
+		kobject_put(sd->s_elem.symlink.target_kobj);
 	if (sd->s_type & SYSFS_COPY_NAME)
 		kfree(sd->s_name);
 	kfree(sd->s_iattr);

@@ -70,8 +66,7 @@ static struct dentry_operations sysfs_dentry_ops = {
 	.d_iput		= sysfs_d_iput,
 };
 
-struct sysfs_dirent *sysfs_new_dirent(const char *name, void *element,
-				      umode_t mode, int type)
+struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
 {
 	char *dup_name = NULL;
 	struct sysfs_dirent * sd;

@@ -94,7 +89,6 @@ struct sysfs_dirent *sysfs_new_dirent(const char *name, void *element,
 	INIT_LIST_HEAD(&sd->s_sibling);
 
 	sd->s_name = name;
-	sd->s_element = element;
 	sd->s_mode = mode;
 	sd->s_type = type;
 

@@ -129,7 +123,7 @@ int sysfs_dirent_exist(struct sysfs_dirent *parent_sd,
 	struct sysfs_dirent * sd;
 
 	list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
-		if (sd->s_element) {
+		if (sd->s_type) {
 			if (strcmp(sd->s_name, new))
 				continue;
 			else

@@ -184,9 +178,10 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
 		goto out_dput;
 
 	error = -ENOMEM;
-	sd = sysfs_new_dirent(name, kobj, mode, SYSFS_DIR);
+	sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
 	if (!sd)
 		goto out_drop;
+	sd->s_elem.dir.kobj = kobj;
 	sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
 
 	error = sysfs_create(dentry, mode, init_dir);

@@ -259,10 +254,10 @@ static int sysfs_attach_attr(struct sysfs_dirent * sd, struct dentry * dentry)
 	int error = 0;
 
         if (sd->s_type & SYSFS_KOBJ_BIN_ATTR) {
-                bin_attr = sd->s_element;
+                bin_attr = sd->s_elem.bin_attr.bin_attr;
                 attr = &bin_attr->attr;
         } else {
-                attr = sd->s_element;
+                attr = sd->s_elem.attr.attr;
                 init = init_file;
         }
 

@@ -367,7 +362,7 @@ static void __sysfs_remove_dir(struct dentry *dentry)
 	mutex_lock(&dentry->d_inode->i_mutex);
 	parent_sd = dentry->d_fsdata;
 	list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) {
-		if (!sd->s_element || !(sd->s_type & SYSFS_NOT_PINNED))
+		if (!sd->s_type || !(sd->s_type & SYSFS_NOT_PINNED))
 			continue;
 		list_del_init(&sd->s_sibling);
 		sysfs_drop_dentry(sd, dentry);

@@ -499,7 +494,7 @@ static int sysfs_dir_open(struct inode *inode, struct file *file)
 	struct sysfs_dirent * sd;
 
 	mutex_lock(&dentry->d_inode->i_mutex);
-	sd = sysfs_new_dirent("_DIR_", NULL, 0, 0);
+	sd = sysfs_new_dirent("_DIR_", 0, 0);
 	if (sd)
 		sysfs_attach_dirent(sd, parent_sd, NULL);
 	mutex_unlock(&dentry->d_inode->i_mutex);

@@ -563,7 +558,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 
 				next = list_entry(p, struct sysfs_dirent,
 						   s_sibling);
-				if (!next->s_element)
+				if (!next->s_type)
 					continue;
 
 				name = next->s_name;

@@ -611,7 +606,7 @@ static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
 				struct sysfs_dirent *next;
 				next = list_entry(p, struct sysfs_dirent,
 						   s_sibling);
-				if (next->s_element)
+				if (next->s_type)
 					n--;
 				p = p->next;
 			}

@@ -678,9 +673,10 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
 	if (!shadow)
 		goto nomem;
 
-	sd = sysfs_new_dirent("_SHADOW_", kobj, inode->i_mode, SYSFS_DIR);
+	sd = sysfs_new_dirent("_SHADOW_", inode->i_mode, SYSFS_DIR);
 	if (!sd)
 		goto nomem;
+	sd->s_elem.dir.kobj = kobj;
 	/* point to parent_sd but don't attach to it */
 	sd->s_parent = sysfs_get(parent_sd);
 	sysfs_attach_dirent(sd, NULL, shadow);

index 62ab272..a6c72c6 100644
@@ -89,7 +89,6 @@ remove_from_collection(struct sysfs_buffer *buffer, struct inode *node)
 static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer)
 {
 	struct sysfs_dirent * sd = dentry->d_fsdata;
-	struct attribute * attr = to_attr(dentry);
 	struct kobject * kobj = to_kobj(dentry->d_parent);
 	struct sysfs_ops * ops = buffer->ops;
 	int ret = 0;

@@ -101,7 +100,7 @@ static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer
 		return -ENOMEM;
 
 	buffer->event = atomic_read(&sd->s_event);
-	count = ops->show(kobj,attr,buffer->page);
+	count = ops->show(kobj, sd->s_elem.attr.attr, buffer->page);
 	BUG_ON(count > (ssize_t)PAGE_SIZE);
 	if (count >= 0) {
 		buffer->needs_read_fill = 0;

@@ -229,11 +228,11 @@ fill_write_buffer(struct sysfs_buffer * buffer, const char __user * buf, size_t
 static int 
 flush_write_buffer(struct dentry * dentry, struct sysfs_buffer * buffer, size_t count)
 {
-	struct attribute * attr = to_attr(dentry);
+	struct sysfs_dirent *attr_sd = dentry->d_fsdata;
 	struct kobject * kobj = to_kobj(dentry->d_parent);
 	struct sysfs_ops * ops = buffer->ops;
 
-	return ops->store(kobj,attr,buffer->page,count);
+	return ops->store(kobj, attr_sd->s_elem.attr.attr, buffer->page, count);
 }
 
 

@@ -278,7 +277,8 @@ out:
 static int sysfs_open_file(struct inode *inode, struct file *file)
 {
 	struct kobject *kobj = sysfs_get_kobject(file->f_path.dentry->d_parent);
-	struct attribute * attr = to_attr(file->f_path.dentry);
+	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+	struct attribute *attr = attr_sd->s_elem.attr.attr;
 	struct sysfs_buffer_collection *set;
 	struct sysfs_buffer * buffer;
 	struct sysfs_ops * ops = NULL;

@@ -371,15 +371,15 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 static int sysfs_release(struct inode * inode, struct file * filp)
 {
 	struct kobject * kobj = to_kobj(filp->f_path.dentry->d_parent);
-	struct attribute * attr = to_attr(filp->f_path.dentry);
-	struct module * owner = attr->owner;
+	struct sysfs_dirent *attr_sd = filp->f_path.dentry->d_fsdata;
+	struct attribute *attr = attr_sd->s_elem.attr.attr;
 	struct sysfs_buffer * buffer = filp->private_data;
 
 	if (buffer)
 		remove_from_collection(buffer, inode);
 	kobject_put(kobj);
 	/* After this point, attr should not be accessed. */
-	module_put(owner);
+	module_put(attr->owner);
 
 	if (buffer) {
 		if (buffer->page)

@@ -484,11 +484,12 @@ int sysfs_add_file(struct dentry * dir, const struct attribute * attr, int type)
 		goto out_unlock;
 	}
 
-	sd = sysfs_new_dirent(attr->name, (void *)attr, mode, type);
+	sd = sysfs_new_dirent(attr->name, mode, type);
 	if (!sd) {
 		error = -ENOMEM;
 		goto out_unlock;
 	}
+	sd->s_elem.attr.attr = (void *)attr;
 	sysfs_attach_dirent(sd, parent_sd, NULL);
 
  out_unlock:

index 4960be8..2581bfa 100644
@@ -255,7 +255,7 @@ int sysfs_hash_and_remove(struct dentry * dir, const char * name)
 	parent_sd = dir->d_fsdata;
 	mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
 	list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
-		if (!sd->s_element)
+		if (!sd->s_type)
 			continue;
 		if (!strcmp(sd->s_name, name)) {
 			list_del_init(&sd->s_sibling);

index 141f7b1..0defb3a 100644
@@ -31,7 +31,6 @@ static struct sysfs_dirent sysfs_root = {
 	.s_count	= ATOMIC_INIT(1),
 	.s_sibling	= LIST_HEAD_INIT(sysfs_root.s_sibling),
 	.s_children	= LIST_HEAD_INIT(sysfs_root.s_children),
-	.s_element	= NULL,
 	.s_type		= SYSFS_ROOT,
 	.s_iattr	= NULL,
 };

index c728204..27df635 100644
@@ -48,30 +48,15 @@ static void fill_object_path(struct kobject * kobj, char * buffer, int length)
 static int sysfs_add_link(struct dentry * parent, const char * name, struct kobject * target)
 {
 	struct sysfs_dirent * parent_sd = parent->d_fsdata;
-	struct sysfs_symlink * sl;
 	struct sysfs_dirent * sd;
-	int error;
 
-	error = -ENOMEM;
-	sl = kzalloc(sizeof(*sl), GFP_KERNEL);
-	if (!sl)
-		goto err_out;
-
-	sl->target_kobj = kobject_get(target);
-
-	sd = sysfs_new_dirent(name, sl, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
+	sd = sysfs_new_dirent(name, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
 	if (!sd)
-		goto err_out;
-	sysfs_attach_dirent(sd, parent_sd, NULL);
+		return -ENOMEM;
 
+	sd->s_elem.symlink.target_kobj = kobject_get(target);
+	sysfs_attach_dirent(sd, parent_sd, NULL);
 	return 0;
-
- err_out:
-	if (sl) {
-		kobject_put(sl->target_kobj);
-		kfree(sl);
-	}
-	return error;
 }
 
 /**

74 lines not on this page · raw message

index d596812..064c1de 100644
@@ -624,7 +624,6 @@ int class_device_add(struct class_device *class_dev)
 		goto out3;
 	class_dev->uevent_attr.attr.name = "uevent";
 	class_dev->uevent_attr.attr.mode = S_IWUSR;
-	class_dev->uevent_attr.attr.owner = parent_class->owner;
 	class_dev->uevent_attr.store = store_uevent;
 	error = class_device_create_file(class_dev, &class_dev->uevent_attr);
 	if (error)

@@ -639,7 +638,6 @@ int class_device_add(struct class_device *class_dev)
 		}
 		attr->attr.name = "dev";
 		attr->attr.mode = S_IRUGO;
-		attr->attr.owner = parent_class->owner;
 		attr->show = show_dev;
 		error = class_device_create_file(class_dev, attr);
 		if (error) {

index d7fcf82..37930d0 100644
@@ -563,8 +563,6 @@ int device_add(struct device *dev)
 
 	dev->uevent_attr.attr.name = "uevent";
 	dev->uevent_attr.attr.mode = S_IWUSR;
-	if (dev->driver)
-		dev->uevent_attr.attr.owner = dev->driver->owner;
 	dev->uevent_attr.store = store_uevent;
 	error = device_create_file(dev, &dev->uevent_attr);
 	if (error)

@@ -579,8 +577,6 @@ int device_add(struct device *dev)
 		}
 		attr->attr.name = "dev";
 		attr->attr.mode = S_IRUGO;
-		if (dev->driver)
-			attr->attr.owner = dev->driver->owner;
 		attr->show = show_dev;
 		error = device_create_file(dev, attr);
 		if (error) {

index c0a979a..8791d06 100644
@@ -276,7 +276,7 @@ out:
 }
 
 static struct bin_attribute firmware_attr_data_tmpl = {
-	.attr = {.name = "data", .mode = 0644, .owner = THIS_MODULE},
+	.attr = {.name = "data", .mode = 0644},
 	.size = 0,
 	.read = firmware_data_read,
 	.write = firmware_data_write,

index a4fb703..4c6b33d 100644
@@ -146,8 +146,7 @@ static void pkt_kobj_release(struct kobject *kobj)
  **********************************************************/
 
 #define DEF_ATTR(_obj,_name,_mode) \
-	static struct attribute _obj = { \
-		.name = _name, .owner = THIS_MODULE, .mode = _mode }
+	static struct attribute _obj = { .name = _name, .mode = _mode }
 
 /**********************************************************
   /sys/class/pktcdvd/pktcdvd[0-7]/

index 8e222f2..b5df7e6 100644
@@ -2171,52 +2171,42 @@ static int create_files(struct bmc_device *bmc)
 	int err;
 
 	bmc->device_id_attr.attr.name = "device_id";
-	bmc->device_id_attr.attr.owner = THIS_MODULE;
 	bmc->device_id_attr.attr.mode = S_IRUGO;
 	bmc->device_id_attr.show = device_id_show;
 
 	bmc->provides_dev_sdrs_attr.attr.name = "provides_device_sdrs";
-	bmc->provides_dev_sdrs_attr.attr.owner = THIS_MODULE;
 	bmc->provides_dev_sdrs_attr.attr.mode = S_IRUGO;
 	bmc->provides_dev_sdrs_attr.show = provides_dev_sdrs_show;
 
 	bmc->revision_attr.attr.name = "revision";
-	bmc->revision_attr.attr.owner = THIS_MODULE;
 	bmc->revision_attr.attr.mode = S_IRUGO;
 	bmc->revision_attr.show = revision_show;
 
 	bmc->firmware_rev_attr.attr.name = "firmware_revision";
-	bmc->firmware_rev_attr.attr.owner = THIS_MODULE;
 	bmc->firmware_rev_attr.attr.mode = S_IRUGO;
 	bmc->firmware_rev_attr.show = firmware_rev_show;
 
 	bmc->version_attr.attr.name = "ipmi_version";
-	bmc->version_attr.attr.owner = THIS_MODULE;
 	bmc->version_attr.attr.mode = S_IRUGO;
 	bmc->version_attr.show = ipmi_version_show;
 
 	bmc->add_dev_support_attr.attr.name = "additional_device_support";
-	bmc->add_dev_support_attr.attr.owner = THIS_MODULE;
 	bmc->add_dev_support_attr.attr.mode = S_IRUGO;
 	bmc->add_dev_support_attr.show = add_dev_support_show;
 
 	bmc->manufacturer_id_attr.attr.name = "manufacturer_id";
-	bmc->manufacturer_id_attr.attr.owner = THIS_MODULE;
 	bmc->manufacturer_id_attr.attr.mode = S_IRUGO;
 	bmc->manufacturer_id_attr.show = manufacturer_id_show;
 
 	bmc->product_id_attr.attr.name = "product_id";
-	bmc->product_id_attr.attr.owner = THIS_MODULE;
 	bmc->product_id_attr.attr.mode = S_IRUGO;
 	bmc->product_id_attr.show = product_id_show;
 
 	bmc->guid_attr.attr.name = "guid";
-	bmc->guid_attr.attr.owner = THIS_MODULE;
 	bmc->guid_attr.attr.mode = S_IRUGO;
 	bmc->guid_attr.show = guid_show;
 
 	bmc->aux_firmware_rev_attr.attr.name = "aux_firmware_revision";
-	bmc->aux_firmware_rev_attr.attr.owner = THIS_MODULE;
 	bmc->aux_firmware_rev_attr.attr.mode = S_IRUGO;
 	bmc->aux_firmware_rev_attr.show = aux_firmware_rev_show;
 

index d1c7cac..7c9589a 100644
@@ -25,8 +25,7 @@ static spinlock_t cpufreq_stats_lock;
 
 #define CPUFREQ_STATDEVICE_ATTR(_name,_mode,_show) \
 static struct freq_attr _attr_##_name = {\
-	.attr = {.name = __stringify(_name), .owner = THIS_MODULE, \
-		.mode = _mode, }, \
+	.attr = {.name = __stringify(_name), .mode = _mode, }, \
 	.show = _show,\
 };
 

index 860345c..a648970 100644
@@ -120,7 +120,7 @@ store_speed (struct cpufreq_policy *policy, const char *buf, size_t count)
 
 static struct freq_attr freq_attr_scaling_setspeed =
 {
-	.attr = { .name = "scaling_setspeed", .mode = 0644, .owner = THIS_MODULE },
+	.attr = { .name = "scaling_setspeed", .mode = 0644 },
 	.show = show_speed,
 	.store = store_speed,
 };

index e749092..5409f3a 100644
@@ -199,7 +199,6 @@ static ssize_t show_available_freqs (struct cpufreq_policy *policy, char *buf)
 struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
 	.attr = { .name = "scaling_available_frequencies",
 		  .mode = 0444,
-		  .owner=THIS_MODULE
 		},
 	.show = show_available_freqs,
 };

index 58a8518..dcdba0f 100644
@@ -67,8 +67,7 @@
 #define DCDBAS_BIN_ATTR_RW(_name) \
 struct bin_attribute bin_attr_##_name = { \
 	.attr =  { .name = __stringify(_name), \
-		   .mode = 0600, \
-		   .owner = THIS_MODULE }, \
+		   .mode = 0600 }, \
 	.read =  _name##_read, \
 	.write = _name##_write, \
 }

index fc702e4..f8afecb 100644
@@ -687,18 +687,18 @@ static ssize_t write_rbu_packet_size(struct kobject *kobj, char *buffer,
 }
 
 static struct bin_attribute rbu_data_attr = {
-	.attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444},
+	.attr = {.name = "data", .mode = 0444},
 	.read = read_rbu_data,
 };
 
 static struct bin_attribute rbu_image_type_attr = {
-	.attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644},
+	.attr = {.name = "image_type", .mode = 0644},
 	.read = read_rbu_image_type,
 	.write = write_rbu_image_type,
 };
 
 static struct bin_attribute rbu_packet_size_attr = {
-	.attr = {.name = "packet_size",.owner = THIS_MODULE,.mode = 0644},
+	.attr = {.name = "packet_size", .mode = 0644},
 	.read = read_rbu_packet_size,
 	.write = write_rbu_packet_size,
 };

index d8806e4..1523227 100644
@@ -74,7 +74,7 @@ static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
 
 #define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
 struct edd_attribute edd_attr_##_name = { 	\
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
+	.attr = {.name = __stringify(_name), .mode = _mode },	\
 	.show	= _show,				\
 	.test	= _test,				\
 };

index c6281cc..b84b2b4 100644
@@ -131,21 +131,21 @@ struct efivar_attribute {
 
 #define EFI_ATTR(_name, _mode, _show, _store) \
 struct subsys_attribute efi_attr_##_name = { \
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \
+	.attr = {.name = __stringify(_name), .mode = _mode}, \
 	.show = _show, \
 	.store = _store, \
 };
 
 #define EFIVAR_ATTR(_name, _mode, _show, _store) \
 struct efivar_attribute efivar_attr_##_name = { \
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \
+	.attr = {.name = __stringify(_name), .mode = _mode}, \
 	.show = _show, \
 	.store = _store, \
 };
 
 #define VAR_SUBSYS_ATTR(_name, _mode, _show, _store) \
 struct subsys_attribute var_subsys_attr_##_name = { \
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \
+	.attr = {.name = __stringify(_name), .mode = _mode}, \
 	.show = _show, \
 	.store = _store, \
 };

index bfce13c..5990dd5 100644
@@ -143,7 +143,6 @@ static struct bin_attribute eeprom_attr = {
 	.attr = {
 		.name = "eeprom",
 		.mode = S_IRUGO,
-		.owner = THIS_MODULE,
 	},
 	.size = EEPROM_SIZE,
 	.read = eeprom_read,

index 76645c1..1405ce5 100644
@@ -152,7 +152,6 @@ static struct bin_attribute user_eeprom_attr = {
 	.attr = {
 		.name = "eeprom",
 		.mode = S_IRUGO,
-		.owner = THIS_MODULE,
 	},
 	.size = USER_EEPROM_SIZE,
 	.read = max6875_read,

index 000c086..f4006e7 100644
@@ -479,7 +479,6 @@ alloc_group_attrs(ssize_t (*show)(struct ib_port *,
 
 		element->attr.attr.name  = element->name;
 		element->attr.attr.mode  = S_IRUGO;
-		element->attr.attr.owner = THIS_MODULE;
 		element->attr.show       = show;
 		element->index		 = i;
 

index cf1de95..4a5bddf 100644
@@ -117,7 +117,6 @@ static struct psmouse_attribute psmouse_attr_##_name = {			\
 		.attr	= {							\
 			.name	= __stringify(_name),				\
 			.mode	= _mode,					\
-			.owner	= THIS_MODULE,					\
 		},								\
 		.show	= psmouse_attr_show_helper,				\
 		.store	= psmouse_attr_set_helper,				\

index 91396fd..f0251a7 100644
@@ -516,40 +516,32 @@ static void pvr2_sysfs_add_control(struct pvr2_sysfs *sfp,int ctl_id)
 	}
 	sfp->item_last = cip;
 
-	cip->attr_name.attr.owner = THIS_MODULE;
 	cip->attr_name.attr.name = "name";
 	cip->attr_name.attr.mode = S_IRUGO;
 	cip->attr_name.show = fp->show_name;
 
-	cip->attr_type.attr.owner = THIS_MODULE;
 	cip->attr_type.attr.name = "type";
 	cip->attr_type.attr.mode = S_IRUGO;
 	cip->attr_type.show = fp->show_type;
 
-	cip->attr_min.attr.owner = THIS_MODULE;
 	cip->attr_min.attr.name = "min_val";
 	cip->attr_min.attr.mode = S_IRUGO;
 	cip->attr_min.show = fp->show_min;
 
-	cip->attr_max.attr.owner = THIS_MODULE;
 	cip->attr_max.attr.name = "max_val";
 	cip->attr_max.attr.mode = S_IRUGO;
 	cip->attr_max.show = fp->show_max;
 
-	cip->attr_val.attr.owner = THIS_MODULE;
 	cip->attr_val.attr.name = "cur_val";
 	cip->attr_val.attr.mode = S_IRUGO;
 
-	cip->attr_custom.attr.owner = THIS_MODULE;
 	cip->attr_custom.attr.name = "custom_val";
 	cip->attr_custom.attr.mode = S_IRUGO;
 
-	cip->attr_enum.attr.owner = THIS_MODULE;
 	cip->attr_enum.attr.name = "enum_val";
 	cip->attr_enum.attr.mode = S_IRUGO;
 	cip->attr_enum.show = fp->show_enum;
 
-	cip->attr_bits.attr.owner = THIS_MODULE;
 	cip->attr_bits.attr.name = "bit_val";
 	cip->attr_bits.attr.mode = S_IRUGO;
 	cip->attr_bits.show = fp->show_bits;

@@ -614,12 +606,10 @@ static void pvr2_sysfs_add_debugifc(struct pvr2_sysfs *sfp)
 
 	dip = kzalloc(sizeof(*dip),GFP_KERNEL);
 	if (!dip) return;
-	dip->attr_debugcmd.attr.owner = THIS_MODULE;
 	dip->attr_debugcmd.attr.name = "debugcmd";
 	dip->attr_debugcmd.attr.mode = S_IRUGO|S_IWUSR|S_IWGRP;
 	dip->attr_debugcmd.show = debugcmd_show;
 	dip->attr_debugcmd.store = debugcmd_store;
-	dip->attr_debuginfo.attr.owner = THIS_MODULE;
 	dip->attr_debuginfo.attr.name = "debuginfo";
 	dip->attr_debuginfo.attr.mode = S_IRUGO;
 	dip->attr_debuginfo.show = debuginfo_show;

@@ -795,7 +785,6 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		return;
 	}
 
-	sfp->attr_v4l_minor_number.attr.owner = THIS_MODULE;
 	sfp->attr_v4l_minor_number.attr.name = "v4l_minor_number";
 	sfp->attr_v4l_minor_number.attr.mode = S_IRUGO;
 	sfp->attr_v4l_minor_number.show = v4l_minor_number_show;

@@ -809,7 +798,6 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		sfp->v4l_minor_number_created_ok = !0;
 	}
 
-	sfp->attr_v4l_radio_minor_number.attr.owner = THIS_MODULE;
 	sfp->attr_v4l_radio_minor_number.attr.name = "v4l_radio_minor_number";
 	sfp->attr_v4l_radio_minor_number.attr.mode = S_IRUGO;
 	sfp->attr_v4l_radio_minor_number.show = v4l_radio_minor_number_show;

@@ -823,7 +811,6 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
 		sfp->v4l_radio_minor_number_created_ok = !0;
 	}
 
-	sfp->attr_unit_number.attr.owner = THIS_MODULE;
 	sfp->attr_unit_number.attr.name = "unit_number";
 	sfp->attr_unit_number.attr.mode = S_IRUGO;
 	sfp->attr_unit_number.show = unit_number_show;

index 4b23212..fe2f29c 100644
@@ -673,8 +673,7 @@ static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
 	struct device_attribute dev_attr_##_name = {			\
 		.attr = {						\
 			.name = __stringify(_name),			\
-			.mode = 0,					\
-			.owner = THIS_MODULE },				\
+			.mode = 0 },					\
 		.show   = NULL,						\
 		.store  = NULL,						\
 	}

index 7f03881..4d5998a 100644
@@ -117,7 +117,6 @@ static struct notification ibm_note;
 static struct bin_attribute ibm_apci_table_attr = {
 	    .attr = {
 		    .name = "apci_table",
-		    .owner = THIS_MODULE,
 		    .mode = S_IRUGO,
 	    },
 	    .read = ibm_read_apci_table,

index cd913a2..d803ddf 100644
@@ -499,7 +499,6 @@ static int pci_create_resource_files(struct pci_dev *pdev)
 			sprintf(res_attr_name, "resource%d", i);
 			res_attr->attr.name = res_attr_name;
 			res_attr->attr.mode = S_IRUSR | S_IWUSR;
-			res_attr->attr.owner = THIS_MODULE;
 			res_attr->size = pci_resource_len(pdev, i);
 			res_attr->mmap = pci_mmap_resource;
 			res_attr->private = &pdev->resource[i];

@@ -582,7 +581,6 @@ static struct bin_attribute pci_config_attr = {
 	.attr =	{
 		.name = "config",
 		.mode = S_IRUGO | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 256,
 	.read = pci_read_config,

@@ -593,7 +591,6 @@ static struct bin_attribute pcie_config_attr = {
 	.attr =	{
 		.name = "config",
 		.mode = S_IRUGO | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 4096,
 	.read = pci_read_config,

@@ -627,7 +624,6 @@ int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 			rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 			rom_attr->attr.name = "rom";
 			rom_attr->attr.mode = S_IRUSR;
-			rom_attr->attr.owner = THIS_MODULE;
 			rom_attr->read = pci_read_rom;
 			rom_attr->write = pci_write_rom;
 			retval = sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);

index ea5765c..b7f321d 100644
@@ -367,7 +367,7 @@ static struct device_attribute *pccard_socket_attributes[] = {
 };
 
 static struct bin_attribute pccard_cis_attr = {
-	.attr = { .name = "cis", .mode = S_IRUGO | S_IWUSR, .owner = THIS_MODULE},
+	.attr = { .name = "cis", .mode = S_IRUGO | S_IWUSR },
 	.size = 0x200,
 	.read = pccard_show_cis,
 	.write = pccard_store_cis,

index e27176c..b3f4c4e 100644
@@ -290,7 +290,6 @@ static struct bin_attribute ds1553_nvram_attr = {
 	.attr = {
 		.name = "nvram",
 		.mode = S_IRUGO | S_IWUGO,
-		.owner = THIS_MODULE,
 	},
 	.size = RTC_OFFSET,
 	.read = ds1553_nvram_read,

index d68288b..1638acd 100644
@@ -159,7 +159,6 @@ static struct bin_attribute ds1742_nvram_attr = {
 	.attr = {
 		.name = "nvram",
 		.mode = S_IRUGO | S_IWUGO,
-		.owner = THIS_MODULE,
 	},
 	.read = ds1742_nvram_read,
 	.write = ds1742_nvram_write,

index 12497da..b08cbac 100644
@@ -189,7 +189,6 @@ static struct bin_attribute arcmsr_sysfs_message_read_attr = {
 	.attr = {
 		.name = "mu_read",
 		.mode = S_IRUSR ,
-		.owner = THIS_MODULE,
 	},
 	.size = 1032,
 	.read = arcmsr_sysfs_iop_message_read,

@@ -199,7 +198,6 @@ static struct bin_attribute arcmsr_sysfs_message_write_attr = {
 	.attr = {
 		.name = "mu_write",
 		.mode = S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 1032,
 	.write = arcmsr_sysfs_iop_message_write,

@@ -209,7 +207,6 @@ static struct bin_attribute arcmsr_sysfs_message_clear_attr = {
 	.attr = {
 		.name = "mu_clear",
 		.mode = S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 1,
 	.write = arcmsr_sysfs_iop_message_clear,

index f247e78..c8ce90b 100644
@@ -1145,7 +1145,6 @@ static struct bin_attribute sysfs_ctlreg_attr = {
 	.attr = {
 		.name = "ctlreg",
 		.mode = S_IRUSR | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 256,
 	.read = sysfs_ctlreg_read,

@@ -1356,7 +1355,6 @@ static struct bin_attribute sysfs_mbox_attr = {
 	.attr = {
 		.name = "mbox",
 		.mode = S_IRUSR | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = sizeof(MAILBOX_t),
 	.read = sysfs_mbox_read,

index 8081b63..9658725 100644
@@ -73,7 +73,6 @@ static struct bin_attribute sysfs_fw_dump_attr = {
 	.attr = {
 		.name = "fw_dump",
 		.mode = S_IRUSR | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 0,
 	.read = qla2x00_sysfs_read_fw_dump,

@@ -149,7 +148,6 @@ static struct bin_attribute sysfs_nvram_attr = {
 	.attr = {
 		.name = "nvram",
 		.mode = S_IRUSR | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 512,
 	.read = qla2x00_sysfs_read_nvram,

@@ -198,7 +196,6 @@ static struct bin_attribute sysfs_optrom_attr = {
 	.attr = {
 		.name = "optrom",
 		.mode = S_IRUSR | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = OPTROM_SIZE_24XX,
 	.read = qla2x00_sysfs_read_optrom,

@@ -279,7 +276,6 @@ static struct bin_attribute sysfs_optrom_ctl_attr = {
 	.attr = {
 		.name = "optrom_ctl",
 		.mode = S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 0,
 	.write = qla2x00_sysfs_write_optrom_ctl,

@@ -327,7 +323,6 @@ static struct bin_attribute sysfs_vpd_attr = {
 	.attr = {
 		.name = "vpd",
 		.mode = S_IRUSR | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = 0,
 	.read = qla2x00_sysfs_read_vpd,

@@ -375,7 +370,6 @@ static struct bin_attribute sysfs_sfp_attr = {
 	.attr = {
 		.name = "sfp",
 		.mode = S_IRUSR | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = SFP_DEV_SIZE * 2,
 	.read = qla2x00_sysfs_read_sfp,

index 8efa07e..fde1ded 100644
@@ -314,7 +314,6 @@ static int at25_probe(struct spi_device *spi)
 	 */
 	at25->bin.attr.name = "eeprom";
 	at25->bin.attr.mode = S_IRUSR;
-	at25->bin.attr.owner = THIS_MODULE;
 	at25->bin.read = at25_bin_read;
 
 	at25->bin.size = at25->chip.byte_len;

index 1bf6f42..fe4e2a4 100644
@@ -2123,7 +2123,6 @@ static ssize_t radeon_show_edid2(struct kobject *kobj, char *buf, loff_t off, si
 static struct bin_attribute edid1_attr = {
 	.attr   = {
 		.name	= "edid1",
-		.owner	= THIS_MODULE,
 		.mode	= 0444,
 	},
 	.size	= EDID_LENGTH,

@@ -2133,7 +2132,6 @@ static struct bin_attribute edid1_attr = {
 static struct bin_attribute edid2_attr = {
 	.attr   = {
 		.name	= "edid2",
-		.owner	= THIS_MODULE,
 		.mode	= 0444,
 	},
 	.size	= EDID_LENGTH,

index c65e81f..7e06223 100644
@@ -172,7 +172,7 @@ static struct class backlight_class = {
 
 #define DECLARE_ATTR(_name,_mode,_show,_store)			\
 {							 	\
-	.attr	= { .name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
+	.attr	= { .name = __stringify(_name), .mode = _mode }, \
 	.show	= _show,					\
 	.store	= _store,					\
 }

index 6ef8f0a..648b53c 100644
@@ -157,7 +157,7 @@ static struct class lcd_class = {
 
 #define DECLARE_ATTR(_name,_mode,_show,_store)			\
 {							 	\
-	.attr	= { .name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
+	.attr	= { .name = __stringify(_name), .mode = _mode }, \
 	.show	= _show,					\
 	.store	= _store,					\
 }

index 8ea17a5..4e13aa7 100644
@@ -252,7 +252,6 @@ static struct bin_attribute w1_f23_bin_attr = {
 	.attr = {
 		.name = "eeprom",
 		.mode = S_IRUGO | S_IWUSR,
-		.owner = THIS_MODULE,
 	},
 	.size = W1_EEPROM_SIZE,
 	.read = w1_f23_read_bin,

index 732db47..721261b 100644
@@ -48,7 +48,6 @@ static struct bin_attribute w1_therm_bin_attr = {
 	.attr = {
 		.name = "w1_slave",
 		.mode = S_IRUGO,
-		.owner = THIS_MODULE,
 	},
 	.size = W1_SLAVE_DATA_SIZE,
 	.read = w1_therm_read_bin,

index 63c0724..c1ee648 100644
@@ -128,7 +128,6 @@ static struct bin_attribute w1_slave_attr_bin_id = {
       .attr = {
               .name = "id",
               .mode = S_IRUGO,
-              .owner = THIS_MODULE,
       },
       .size = 8,
       .read = w1_slave_read_id,

@@ -167,7 +166,6 @@ static struct bin_attribute w1_default_attr = {
       .attr = {
               .name = "rw",
               .mode = S_IRUGO | S_IWUSR,
-              .owner = THIS_MODULE,
       },
       .size = PAGE_SIZE,
       .read = w1_default_read,

index fc4a3a2..6669a25 100644
@@ -842,8 +842,6 @@ static int __init ecryptfs_init(void)
 		goto out;
 	}
 	kset_set_kset_s(&ecryptfs_subsys, fs_subsys);
-	sysfs_attr_version.attr.owner = THIS_MODULE;
-	sysfs_attr_version_str.attr.owner = THIS_MODULE;
 	rc = do_sysfs_registration();
 	if (rc) {
 		printk(KERN_ERR "sysfs registration failed\n");

index 636593b..fd741ce 100644
@@ -74,7 +74,6 @@ struct mlog_attribute {
 #define define_mask(_name) {			\
 	.attr = {				\
 		.name = #_name,			\
-		.owner = THIS_MODULE,		\
 		.mode = S_IRUGO | S_IWUSR,	\
 	},					\
 	.mask = ML_##_name,			\

index 8a7d003..694b369 100644
@@ -393,7 +393,6 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len,
 		static struct attribute addpartattr = {
 			.name = "whole_disk",
 			.mode = S_IRUSR | S_IRGRP | S_IROTH,
-			.owner = THIS_MODULE,
 		};
 
 		sysfs_create_file(&p->kobj, &addpartattr);

index a2180c5..0d61234 100644
@@ -177,25 +177,20 @@ static int open(struct inode * inode, struct file * file)
 	if (!sysfs_get_dir_kobj(attr_sd->s_parent))
 		return -ENODEV;
 
-	/* Grab the module reference for this attribute */
-	error = -ENODEV;
-	if (!try_module_get(attr->attr.owner))
-		goto err_sput;
-
 	error = -EACCES;
 	if ((file->f_mode & FMODE_WRITE) && !(attr->write || attr->mmap))
-		goto err_mput;
+		goto err_out;
 	if ((file->f_mode & FMODE_READ) && !(attr->read || attr->mmap))
-		goto err_mput;
+		goto err_out;
 
 	error = -ENOMEM;
 	bb = kzalloc(sizeof(*bb), GFP_KERNEL);
 	if (!bb)
-		goto err_mput;
+		goto err_out;
 
 	bb->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!bb->buffer)
-		goto err_mput;
+		goto err_out;
 
 	mutex_init(&bb->mutex);
 	file->private_data = bb;

@@ -205,9 +200,7 @@ static int open(struct inode * inode, struct file * file)
 	sysfs_get(attr_sd);
 	return 0;
 
- err_mput:
-	module_put(attr->attr.owner);
- err_sput:
+ err_out:
 	sysfs_put_dir_kobj(attr_sd->s_parent);
 	kfree(bb);
 	return error;

@@ -216,13 +209,11 @@ static int open(struct inode * inode, struct file * file)
 static int release(struct inode * inode, struct file * file)
 {
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
-	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
 	struct bin_buffer *bb = file->private_data;
 
 	if (bb->mmapped)
 		sysfs_put_dir_kobj(attr_sd->s_parent);
 	sysfs_put(attr_sd);
-	module_put(attr->attr.owner);
 	kfree(bb->buffer);
 	kfree(bb);
 	return 0;

index cd80b20..245ffbc 100644
@@ -271,24 +271,15 @@ sysfs_write_file(struct file *file, const char __user *buf, size_t count, loff_t
 static int sysfs_open_file(struct inode *inode, struct file *file)
 {
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
-	struct attribute *attr = attr_sd->s_elem.attr.attr;
 	struct sysfs_buffer * buffer;
 	struct sysfs_ops * ops = NULL;
 	struct kobject *kobj;
 	int error;
 
-	/* Grab kobject first.  attr might go away underneath us if
-	 * we're not holding kobject.
-	 */
 	kobj = sysfs_get_dir_kobj(attr_sd->s_parent);
 	if (!kobj)
 		return -ENODEV;
 
-	/* Grab the module reference for this attribute */
-	error = -ENODEV;
-	if (!try_module_get(attr->owner))
-		goto err_sput;
-
 	/* if the kobject has no ktype, then we assume that it is a subsystem
 	 * itself, and use ops for it.
 	 */

@@ -305,7 +296,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 	 * or the subsystem have no operations.
 	 */
 	if (!ops)
-		goto err_mput;
+		goto err_out;
 
 	/* File needs write support.
 	 * The inode's perms must say it's ok, 

@@ -313,7 +304,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 	 */
 	if (file->f_mode & FMODE_WRITE) {
 		if (!(inode->i_mode & S_IWUGO) || !ops->store)
-			goto err_mput;
+			goto err_out;
 	}
 
 	/* File needs read support.

@@ -322,7 +313,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 	 */
 	if (file->f_mode & FMODE_READ) {
 		if (!(inode->i_mode & S_IRUGO) || !ops->show)
-			goto err_mput;
+			goto err_out;
 	}
 
 	/* No error? Great, allocate a buffer for the file, and store it

@@ -331,7 +322,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 	error = -ENOMEM;
 	buffer = kzalloc(sizeof(struct sysfs_buffer), GFP_KERNEL);
 	if (!buffer)
-		goto err_mput;
+		goto err_out;
 
 	init_MUTEX(&buffer->sem);
 	buffer->needs_read_fill = 1;

@@ -343,9 +334,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 	sysfs_get(attr_sd);
 	return 0;
 
- err_mput:
-	module_put(attr->owner);
- err_sput:
+ err_out:
 	sysfs_put_dir_kobj(attr_sd->s_parent);
 	return error;
 }

@@ -353,12 +342,9 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 static int sysfs_release(struct inode * inode, struct file * filp)
 {
 	struct sysfs_dirent *attr_sd = filp->f_path.dentry->d_fsdata;
-	struct attribute *attr = attr_sd->s_elem.attr.attr;
 	struct sysfs_buffer *buffer = filp->private_data;
 
 	sysfs_put(attr_sd);
-	/* After this point, attr should not be accessed. */
-	module_put(attr->owner);
 
 	if (buffer) {
 		if (buffer->page)

index 389ccf8..6e7c398 100644
@@ -100,8 +100,7 @@ struct sysdev_attribute {
 
 #define _SYSDEV_ATTR(_name,_mode,_show,_store)			\
 {								\
-	.attr = { .name = __stringify(_name), .mode = _mode,	\
-		 .owner = THIS_MODULE },			\
+	.attr = { .name = __stringify(_name), .mode = _mode },	\
 	.show	= _show,					\
 	.store	= _store,					\
 }

index c79944a..882f6f7 100644
@@ -22,7 +22,6 @@ struct dentry;
 
 struct attribute {
 	const char		* name;
-	struct module 		* owner;
 	mode_t			mode;
 };
 

@@ -39,14 +38,14 @@ struct attribute_group {
  */
 
 #define __ATTR(_name,_mode,_show,_store) { \
-	.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE },	\
+	.attr = {.name = __stringify(_name), .mode = _mode },	\
 	.show	= _show,					\
 	.store	= _store,					\
 }
 
 #define __ATTR_RO(_name) { \
-	.attr	= { .name = __stringify(_name), .mode = 0444, .owner = THIS_MODULE },	\
-	.show	= _name##_show,	\
+	.attr	= { .name = __stringify(_name), .mode = 0444 },	\
+	.show	= _name##_show,					\
 }
 
 #define __ATTR_NULL { .attr = { .name = NULL } }

index dcdb32b..13fa1df 100644
@@ -485,8 +485,7 @@ static void free_modinfo_##field(struct module *mod)                  \
         mod->field = NULL;                                            \
 }                                                                     \
 static struct module_attribute modinfo_##field = {                    \
-	.attr = { .name = __stringify(field), .mode = 0444,           \
-		  .owner = THIS_MODULE },                             \
+	.attr = { .name = __stringify(field), .mode = 0444 },         \
 	.show = show_modinfo_##field,                                 \
 	.setup = setup_modinfo_##field,                               \
 	.test = modinfo_##field##_exists,                             \

@@ -790,7 +789,7 @@ static ssize_t show_refcnt(struct module_attribute *mattr,
 }
 
 static struct module_attribute refcnt = {
-	.attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE },
+	.attr = { .name = "refcnt", .mode = 0444 },
 	.show = show_refcnt,
 };
 

@@ -848,7 +847,7 @@ static ssize_t show_initstate(struct module_attribute *mattr,
 }
 
 static struct module_attribute initstate = {
-	.attr = { .name = "initstate", .mode = 0444, .owner = THIS_MODULE },
+	.attr = { .name = "initstate", .mode = 0444 },
 	.show = show_initstate,
 };
 

@@ -1029,7 +1028,6 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
 		sattr->mattr.show = module_sect_show;
 		sattr->mattr.store = NULL;
 		sattr->mattr.attr.name = sattr->name;
-		sattr->mattr.attr.owner = mod;
 		sattr->mattr.attr.mode = S_IRUGO;
 		*(gattr++) = &(sattr++)->mattr.attr;
 	}

@@ -1087,7 +1085,6 @@ int module_add_modinfo_attrs(struct module *mod)
 		if (!attr->test ||
 		    (attr->test && attr->test(mod))) {
 			memcpy(temp_attr, attr, sizeof(*temp_attr));
-			temp_attr->attr.owner = mod;
 			error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
 			++temp_attr;
 		}

index e265b13..3a1d5bc 100644
@@ -487,7 +487,6 @@ param_sysfs_setup(struct module_kobject *mk,
 			pattr->mattr.show = param_attr_show;
 			pattr->mattr.store = param_attr_store;
 			pattr->mattr.attr.name = (char *)&kp->name[name_skip];
-			pattr->mattr.attr.owner = mk->mod;
 			pattr->mattr.attr.mode = kp->perm;
 			*(gattr++) = &(pattr++)->mattr.attr;
 		}

index 01a22ad..40b0972 100644
@@ -365,8 +365,7 @@ static ssize_t brforward_read(struct kobject *kobj, char *buf,
 
 static struct bin_attribute bridge_forward = {
 	.attr = { .name = SYSFS_BRIDGE_FDB,
-		  .mode = S_IRUGO,
-		  .owner = THIS_MODULE, },
+		  .mode = S_IRUGO, },
 	.read = brforward_read,
 };
 

index 0bc2aef..8ea600c 100644
@@ -29,8 +29,7 @@ struct brport_attribute {
 #define BRPORT_ATTR(_name,_mode,_show,_store)		        \
 struct brport_attribute brport_attr_##_name = { 	        \
 	.attr = {.name = __stringify(_name), 			\
-		 .mode = _mode, 				\
-		 .owner = THIS_MODULE, },			\
+		 .mode = _mode },				\
 	.show	= _show,					\
 	.store	= _store,					\
 };

index 99a0ba1..653c23c 100644
@@ -60,10 +60,7 @@ static struct dentry_operations sysfs_dentry_ops = {
 	.d_iput		= sysfs_d_iput,
 };
 
-/*
- * Allocates a new sysfs_dirent and links it to the parent sysfs_dirent
- */
-static struct sysfs_dirent * __sysfs_new_dirent(void * element)
+struct sysfs_dirent *sysfs_new_dirent(void *element, umode_t mode, int type)
 {
 	struct sysfs_dirent * sd;
 

@@ -75,25 +72,25 @@ static struct sysfs_dirent * __sysfs_new_dirent(void * element)
 	atomic_set(&sd->s_event, 1);
 	INIT_LIST_HEAD(&sd->s_children);
 	INIT_LIST_HEAD(&sd->s_sibling);
+
 	sd->s_element = element;
+	sd->s_mode = mode;
+	sd->s_type = type;
 
 	return sd;
 }
 
-static void __sysfs_list_dirent(struct sysfs_dirent *parent_sd,
-			      struct sysfs_dirent *sd)
+void sysfs_attach_dirent(struct sysfs_dirent *sd,
+			 struct sysfs_dirent *parent_sd, struct dentry *dentry)
 {
-	if (sd)
-		list_add(&sd->s_sibling, &parent_sd->s_children);
-}
+	if (dentry) {
+		sd->s_dentry = dentry;
+		dentry->d_fsdata = sysfs_get(sd);
+		dentry->d_op = &sysfs_dentry_ops;
+	}
 
-static struct sysfs_dirent * sysfs_new_dirent(struct sysfs_dirent *parent_sd,
-						void * element)
-{
-	struct sysfs_dirent *sd;
-	sd = __sysfs_new_dirent(element);
-	__sysfs_list_dirent(parent_sd, sd);
-	return sd;
+	if (parent_sd)
+		list_add(&sd->s_sibling, &parent_sd->s_children);
 }
 
 /*

@@ -121,39 +118,6 @@ int sysfs_dirent_exist(struct sysfs_dirent *parent_sd,
 	return 0;
 }
 
-
-static struct sysfs_dirent *
-__sysfs_make_dirent(struct dentry *dentry, void *element, mode_t mode, int type)
-{
-	struct sysfs_dirent * sd;
-
-	sd = __sysfs_new_dirent(element);
-	if (!sd)
-		goto out;
-
-	sd->s_mode = mode;
-	sd->s_type = type;
-	sd->s_dentry = dentry;
-	if (dentry) {
-		dentry->d_fsdata = sysfs_get(sd);
-		dentry->d_op = &sysfs_dentry_ops;
-	}
-
-out:
-	return sd;
-}
-
-int sysfs_make_dirent(struct sysfs_dirent * parent_sd, struct dentry * dentry,
-			void * element, umode_t mode, int type)
-{
-	struct sysfs_dirent *sd;
-
-	sd = __sysfs_make_dirent(dentry, element, mode, type);
-	__sysfs_list_dirent(parent_sd, sd);
-
-	return sd ? 0 : -ENOMEM;
-}
-
 static int init_dir(struct inode * inode)
 {
 	inode->i_op = &sysfs_dir_inode_operations;

@@ -197,10 +161,11 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
 	if (sysfs_dirent_exist(parent->d_fsdata, name))
 		goto out_dput;
 
-	error = sysfs_make_dirent(parent->d_fsdata, dentry, kobj, mode,
-				  SYSFS_DIR);
-	if (error)
+	error = -ENOMEM;
+	sd = sysfs_new_dirent(kobj, mode, SYSFS_DIR);
+	if (!sd)
 		goto out_drop;
+	sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
 
 	error = sysfs_create(dentry, mode, init_dir);
 	if (error)

@@ -215,7 +180,6 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
 	goto out_dput;
 
  out_sput:
-	sd = dentry->d_fsdata;
 	list_del_init(&sd->s_sibling);
 	sysfs_put(sd);
  out_drop:

@@ -512,13 +476,16 @@ static int sysfs_dir_open(struct inode *inode, struct file *file)
 {
 	struct dentry * dentry = file->f_path.dentry;
 	struct sysfs_dirent * parent_sd = dentry->d_fsdata;
+	struct sysfs_dirent * sd;
 
 	mutex_lock(&dentry->d_inode->i_mutex);
-	file->private_data = sysfs_new_dirent(parent_sd, NULL);
+	sd = sysfs_new_dirent(NULL, 0, 0);
+	if (sd)
+		sysfs_attach_dirent(sd, parent_sd, NULL);
 	mutex_unlock(&dentry->d_inode->i_mutex);
 
-	return file->private_data ? 0 : -ENOMEM;
-
+	file->private_data = sd;
+	return sd ? 0 : -ENOMEM;
 }
 
 static int sysfs_dir_close(struct inode *inode, struct file *file)

@@ -691,9 +658,10 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
 	if (!shadow)
 		goto nomem;
 
-	sd = __sysfs_make_dirent(shadow, kobj, inode->i_mode, SYSFS_DIR);
+	sd = sysfs_new_dirent(kobj, inode->i_mode, SYSFS_DIR);
 	if (!sd)
 		goto nomem;
+	sysfs_attach_dirent(sd, NULL, shadow);
 
 	d_instantiate(shadow, igrab(inode));
 	inc_nlink(inode);

index fc46333..f6b86a8 100644
@@ -474,14 +474,25 @@ int sysfs_add_file(struct dentry * dir, const struct attribute * attr, int type)
 {
 	struct sysfs_dirent * parent_sd = dir->d_fsdata;
 	umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG;
-	int error = -EEXIST;
+	struct sysfs_dirent *sd;
+	int error = 0;
 
 	mutex_lock(&dir->d_inode->i_mutex);
-	if (!sysfs_dirent_exist(parent_sd, attr->name))
-		error = sysfs_make_dirent(parent_sd, NULL, (void *)attr,
-					  mode, type);
-	mutex_unlock(&dir->d_inode->i_mutex);
 
+	if (sysfs_dirent_exist(parent_sd, attr->name)) {
+		error = -EEXIST;
+		goto out_unlock;
+	}
+
+	sd = sysfs_new_dirent((void *)attr, mode, type);
+	if (!sd) {
+		error = -ENOMEM;
+		goto out_unlock;
+	}
+	sysfs_attach_dirent(sd, parent_sd, NULL);
+
+ out_unlock:
+	mutex_unlock(&dir->d_inode->i_mutex);
 	return error;
 }
 

index b463f17..d96bb9c 100644
@@ -49,6 +49,7 @@ static int sysfs_add_link(struct dentry * parent, const char * name, struct kobj
 {
 	struct sysfs_dirent * parent_sd = parent->d_fsdata;
 	struct sysfs_symlink * sl;
+	struct sysfs_dirent * sd;
 	int error;
 
 	error = -ENOMEM;

@@ -63,10 +64,10 @@ static int sysfs_add_link(struct dentry * parent, const char * name, struct kobj
 	strcpy(sl->link_name, name);
 	sl->target_kobj = kobject_get(target);
 
-	error = sysfs_make_dirent(parent_sd, NULL, sl, S_IFLNK|S_IRWXUGO,
-				SYSFS_KOBJ_LINK);
-	if (error)
+	sd = sysfs_new_dirent(sl, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
+	if (!sd)
 		goto err_out;
+	sysfs_attach_dirent(sd, parent_sd, NULL);
 
 	return 0;
 

index 812c8c3..104649c 100644
@@ -20,8 +20,11 @@ extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
 extern struct kobject *sysfs_get_kobject(struct dentry *dentry);
 extern void release_sysfs_dirent(struct sysfs_dirent * sd);
 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
-extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,
-				umode_t, int);
+extern struct sysfs_dirent *sysfs_new_dirent(void *element, umode_t mode,
+					     int type);
+extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
+				struct sysfs_dirent *parent_sd,
+				struct dentry *dentry);
 
 extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);

index 0f0027b..1dd1bf1 100644
@@ -20,6 +20,11 @@
 
 #include "sysfs.h"
 
+struct bin_buffer {
+	struct mutex	mutex;
+	void		*buffer;
+};
+
 static int
 fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
 {

@@ -36,7 +41,7 @@ fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
 static ssize_t
 read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
 {
-	char *buffer = file->private_data;
+	struct bin_buffer *bb = file->private_data;
 	struct dentry *dentry = file->f_path.dentry;
 	int size = dentry->d_inode->i_size;
 	loff_t offs = *off;

@@ -49,17 +54,23 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
 			count = size - offs;
 	}
 
-	count = fill_read(dentry, buffer, offs, count);
+	mutex_lock(&bb->mutex);
+
+	count = fill_read(dentry, bb->buffer, offs, count);
 	if (count < 0)
-		return count;
+		goto out_unlock;
 
-	if (copy_to_user(userbuf, buffer, count))
-		return -EFAULT;
+	if (copy_to_user(userbuf, bb->buffer, count)) {
+		count = -EFAULT;
+		goto out_unlock;
+	}
 
 	pr_debug("offs = %lld, *off = %lld, count = %zd\n", offs, *off, count);
 
 	*off = offs + count;
 
+ out_unlock:
+	mutex_unlock(&bb->mutex);
 	return count;
 }
 

@@ -79,7 +90,7 @@ flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
 static ssize_t write(struct file *file, const char __user *userbuf,
 		     size_t bytes, loff_t *off)
 {
-	char *buffer = file->private_data;
+	struct bin_buffer *bb = file->private_data;
 	struct dentry *dentry = file->f_path.dentry;
 	int size = dentry->d_inode->i_size;
 	loff_t offs = *off;

@@ -92,25 +103,38 @@ static ssize_t write(struct file *file, const char __user *userbuf,
 			count = size - offs;
 	}
 
-	if (copy_from_user(buffer, userbuf, count))
-		return -EFAULT;
+	mutex_lock(&bb->mutex);
+
+	if (copy_from_user(bb->buffer, userbuf, count)) {
+		count = -EFAULT;
+		goto out_unlock;
+	}
 
-	count = flush_write(dentry, buffer, offs, count);
+	count = flush_write(dentry, bb->buffer, offs, count);
 	if (count > 0)
 		*off = offs + count;
+
+ out_unlock:
+	mutex_unlock(&bb->mutex);
 	return count;
 }
 
 static int mmap(struct file *file, struct vm_area_struct *vma)
 {
+	struct bin_buffer *bb = file->private_data;
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
 	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
 	struct kobject *kobj = to_kobj(file->f_path.dentry->d_parent);
+	int rc;
 
 	if (!attr->mmap)
 		return -EINVAL;
 
-	return attr->mmap(kobj, attr, vma);
+	mutex_lock(&bb->mutex);
+	rc = attr->mmap(kobj, attr, vma);
+	mutex_unlock(&bb->mutex);
+
+	return rc;
 }
 
 static int open(struct inode * inode, struct file * file)

@@ -118,6 +142,7 @@ static int open(struct inode * inode, struct file * file)
 	struct kobject *kobj = sysfs_get_kobject(file->f_path.dentry->d_parent);
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
 	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
+	struct bin_buffer *bb = NULL;
 	int error = -EINVAL;
 
 	if (!kobj || !attr)

@@ -135,14 +160,22 @@ static int open(struct inode * inode, struct file * file)
 		goto Error;
 
 	error = -ENOMEM;
-	file->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	if (!file->private_data)
+	bb = kzalloc(sizeof(*bb), GFP_KERNEL);
+	if (!bb)
 		goto Error;
 
+	bb->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!bb->buffer)
+		goto Error;
+
+	mutex_init(&bb->mutex);
+	file->private_data = bb;
+
 	error = 0;
-    goto Done;
+	goto Done;
 
  Error:
+	kfree(bb);
 	module_put(attr->attr.owner);
  Done:
 	if (error)

@@ -155,11 +188,12 @@ static int release(struct inode * inode, struct file * file)
 	struct kobject * kobj = to_kobj(file->f_path.dentry->d_parent);
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
 	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
-	u8 * buffer = file->private_data;
+	struct bin_buffer *bb = file->private_data;
 
 	kobject_put(kobj);
 	module_put(attr->attr.owner);
-	kfree(buffer);
+	kfree(bb->buffer);
+	kfree(bb);
 	return 0;
 }
 

index 653c23c..ef45c3e 100644
@@ -34,6 +34,11 @@ struct kobject *sysfs_get_kobject(struct dentry *dentry)
 
 void release_sysfs_dirent(struct sysfs_dirent * sd)
 {
+	struct sysfs_dirent *parent_sd;
+
+ repeat:
+	parent_sd = sd->s_parent;
+
 	if (sd->s_type & SYSFS_KOBJ_LINK) {
 		struct sysfs_symlink * sl = sd->s_element;
 		kfree(sl->link_name);

@@ -42,6 +47,10 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 	}
 	kfree(sd->s_iattr);
 	kmem_cache_free(sysfs_dir_cachep, sd);
+
+	sd = parent_sd;
+	if (sd && atomic_dec_and_test(&sd->s_count))
+		goto repeat;
 }
 
 static void sysfs_d_iput(struct dentry * dentry, struct inode * inode)

@@ -89,8 +98,10 @@ void sysfs_attach_dirent(struct sysfs_dirent *sd,
 		dentry->d_op = &sysfs_dentry_ops;
 	}
 
-	if (parent_sd)
+	if (parent_sd) {
+		sd->s_parent = sysfs_get(parent_sd);
 		list_add(&sd->s_sibling, &parent_sd->s_children);
+	}
 }
 
 /*

@@ -526,7 +537,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 			i++;
 			/* fallthrough */
 		case 1:
-			ino = (unsigned long)dentry->d_parent->d_fsdata;
+			ino = (unsigned long)parent_sd->s_parent;
 			if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
 				break;
 			filp->f_pos++;

@@ -643,13 +654,13 @@ int sysfs_make_shadowed_dir(struct kobject *kobj,
 
 struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
 {
+	struct dentry *dir = kobj->dentry;
+	struct inode *inode = dir->d_inode;
+	struct dentry *parent = dir->d_parent;
+	struct sysfs_dirent *parent_sd = parent->d_fsdata;
+	struct dentry *shadow;
 	struct sysfs_dirent *sd;
-	struct dentry *parent, *dir, *shadow;
-	struct inode *inode;
 
-	dir = kobj->dentry;
-	inode = dir->d_inode;
-	parent = dir->d_parent;
 	shadow = ERR_PTR(-EINVAL);
 	if (!sysfs_is_shadowed_inode(inode))
 		goto out;

@@ -661,6 +672,8 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
 	sd = sysfs_new_dirent(kobj, inode->i_mode, SYSFS_DIR);
 	if (!sd)
 		goto nomem;
+	/* point to parent_sd but don't attach to it */
+	sd->s_parent = sysfs_get(parent_sd);
 	sysfs_attach_dirent(sd, NULL, shadow);
 
 	d_instantiate(shadow, igrab(inode));

index 23a48a3..141f7b1 100644
@@ -28,6 +28,7 @@ static const struct super_operations sysfs_ops = {
 };
 
 static struct sysfs_dirent sysfs_root = {
+	.s_count	= ATOMIC_INIT(1),
 	.s_sibling	= LIST_HEAD_INIT(sysfs_root.s_sibling),
 	.s_children	= LIST_HEAD_INIT(sysfs_root.s_children),
 	.s_element	= NULL,

index 104649c..b4876de 100644
@@ -1,5 +1,6 @@
 struct sysfs_dirent {
 	atomic_t		s_count;
+	struct sysfs_dirent	* s_parent;
 	struct list_head	s_sibling;
 	struct list_head	s_children;
 	void 			* s_element;

index 1dd1bf1..a2180c5 100644
@@ -23,6 +23,7 @@
 struct bin_buffer {
 	struct mutex	mutex;
 	void		*buffer;
+	int		mmapped;
 };
 
 static int

@@ -30,12 +31,20 @@ fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
 {
 	struct sysfs_dirent *attr_sd = dentry->d_fsdata;
 	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
-	struct kobject * kobj = to_kobj(dentry->d_parent);
+	struct kobject *kobj;
+	int rc;
+
+	kobj = sysfs_get_dir_kobj(attr_sd->s_parent);
+	if (!kobj)
+		return -ENODEV;
 
-	if (!attr->read)
-		return -EIO;
+	rc = -EIO;
+	if (attr->read)
+		rc = attr->read(kobj, buffer, off, count);
 
-	return attr->read(kobj, buffer, off, count);
+	sysfs_put_dir_kobj(attr_sd->s_parent);
+
+	return rc;
 }
 
 static ssize_t

@@ -79,12 +88,20 @@ flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
 {
 	struct sysfs_dirent *attr_sd = dentry->d_fsdata;
 	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
-	struct kobject *kobj = to_kobj(dentry->d_parent);
+	struct kobject *kobj;
+	int rc;
+
+	kobj = sysfs_get_dir_kobj(attr_sd->s_parent);
+	if (!kobj)
+		return -ENODEV;
 
-	if (!attr->write)
-		return -EIO;
+	rc = -EIO;
+	if (attr->write)
+		rc = attr->write(kobj, buffer, offset, count);
 
-	return attr->write(kobj, buffer, offset, count);
+	sysfs_put_dir_kobj(attr_sd->s_parent);
+
+	return rc;
 }
 
 static ssize_t write(struct file *file, const char __user *userbuf,

@@ -124,14 +141,24 @@ static int mmap(struct file *file, struct vm_area_struct *vma)
 	struct bin_buffer *bb = file->private_data;
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
 	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
-	struct kobject *kobj = to_kobj(file->f_path.dentry->d_parent);
+	struct kobject *kobj;
 	int rc;
 
-	if (!attr->mmap)
-		return -EINVAL;
-
 	mutex_lock(&bb->mutex);
-	rc = attr->mmap(kobj, attr, vma);
+
+	kobj = sysfs_get_dir_kobj(attr_sd->s_parent);
+	if (!kobj)
+		return -ENODEV;
+
+	rc = -EINVAL;
+	if (attr->mmap)
+		rc = attr->mmap(kobj, attr, vma);
+
+	if (rc == 0 && !bb->mmapped)
+		bb->mmapped = 1;
+	else
+		sysfs_put_dir_kobj(attr_sd->s_parent);
+
 	mutex_unlock(&bb->mutex);
 
 	return rc;

@@ -139,58 +166,62 @@ static int mmap(struct file *file, struct vm_area_struct *vma)
 
 static int open(struct inode * inode, struct file * file)
 {
-	struct kobject *kobj = sysfs_get_kobject(file->f_path.dentry->d_parent);
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
 	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
 	struct bin_buffer *bb = NULL;
-	int error = -EINVAL;
+	int error;
 
-	if (!kobj || !attr)
-		goto Done;
+	/* Grab kobject first.  attr might go away underneath us if
+	 * we're not holding kobject.
+	 */
+	if (!sysfs_get_dir_kobj(attr_sd->s_parent))
+		return -ENODEV;
 
-	/* Grab the module reference for this attribute if we have one */
+	/* Grab the module reference for this attribute */
 	error = -ENODEV;
-	if (!try_module_get(attr->attr.owner)) 
-		goto Done;
+	if (!try_module_get(attr->attr.owner))
+		goto err_sput;
 
 	error = -EACCES;
 	if ((file->f_mode & FMODE_WRITE) && !(attr->write || attr->mmap))
-		goto Error;
+		goto err_mput;
 	if ((file->f_mode & FMODE_READ) && !(attr->read || attr->mmap))
-		goto Error;
+		goto err_mput;
 
 	error = -ENOMEM;
 	bb = kzalloc(sizeof(*bb), GFP_KERNEL);
 	if (!bb)
-		goto Error;
+		goto err_mput;
 
 	bb->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!bb->buffer)
-		goto Error;
+		goto err_mput;
 
 	mutex_init(&bb->mutex);
 	file->private_data = bb;
 
-	error = 0;
-	goto Done;
+	/* open succeeded, put kobj and pin attr_sd */
+	sysfs_put_dir_kobj(attr_sd->s_parent);
+	sysfs_get(attr_sd);
+	return 0;
 
- Error:
-	kfree(bb);
+ err_mput:
 	module_put(attr->attr.owner);
- Done:
-	if (error)
-		kobject_put(kobj);
+ err_sput:
+	sysfs_put_dir_kobj(attr_sd->s_parent);
+	kfree(bb);
 	return error;
 }
 
 static int release(struct inode * inode, struct file * file)
 {
-	struct kobject * kobj = to_kobj(file->f_path.dentry->d_parent);
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
 	struct bin_attribute *attr = attr_sd->s_elem.bin_attr.bin_attr;
 	struct bin_buffer *bb = file->private_data;
 
-	kobject_put(kobj);
+	if (bb->mmapped)
+		sysfs_put_dir_kobj(attr_sd->s_parent);
+	sysfs_put(attr_sd);
 	module_put(attr->attr.owner);
 	kfree(bb->buffer);
 	kfree(bb);

index b7d0e0e..b2406cb 100644
@@ -15,22 +15,28 @@
 DECLARE_RWSEM(sysfs_rename_sem);
 spinlock_t kobj_sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
 
-struct kobject *sysfs_get_kobject(struct dentry *dentry)
+struct kobject *sysfs_get_dir_kobj(struct sysfs_dirent *sd)
 {
-	struct kobject * kobj = NULL;
+	struct sysfs_elem_dir *sdir = &sd->s_elem.dir;
 
-	spin_lock(&dcache_lock);
-	if (!d_unhashed(dentry)) {
-		struct sysfs_dirent * sd = dentry->d_fsdata;
+	BUG_ON(!(sd->s_type & SYSFS_DIR));
 
-		if (sd->s_type & SYSFS_KOBJ_LINK)
-			sd = sd->s_elem.symlink.target_sd;
+	if (unlikely(!down_read_trylock(&sdir->rwsem)))
+		return NULL;
 
-		kobj = kobject_get(sd->s_elem.dir.kobj);
-	}
-	spin_unlock(&dcache_lock);
+	if (unlikely(!sdir->kobj))
+		up_read(&sdir->rwsem);
 
-	return kobj;
+	return sdir->kobj;
+}
+
+void sysfs_put_dir_kobj(struct sysfs_dirent *sd)
+{
+	struct sysfs_elem_dir *sdir = &sd->s_elem.dir;
+
+	BUG_ON(!(sd->s_type & SYSFS_DIR) || !sdir->kobj);
+
+	up_read(&sdir->rwsem);
 }
 
 void release_sysfs_dirent(struct sysfs_dirent * sd)

@@ -183,6 +189,7 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
 	sd = sysfs_new_dirent(name, mode, SYSFS_DIR);
 	if (!sd)
 		goto out_drop;
+	init_rwsem(&sd->s_elem.dir.rwsem);
 	sd->s_elem.dir.kobj = kobj;
 	sysfs_attach_dirent(sd, parent->d_fsdata, dentry);
 

@@ -328,11 +335,16 @@ const struct inode_operations sysfs_dir_inode_operations = {
 static void remove_dir(struct dentry * d)
 {
 	struct dentry * parent = dget(d->d_parent);
-	struct sysfs_dirent * sd;
+	struct sysfs_dirent *sd = d->d_fsdata;
+	struct sysfs_elem_dir *sdir = &sd->s_elem.dir;
+
+	/* disconnect kobject */
+	down_write(&sdir->rwsem);
+	sdir->kobj = NULL;
+	up_write(&sdir->rwsem);
 
 	mutex_lock(&parent->d_inode->i_mutex);
 	d_delete(d);
-	sd = d->d_fsdata;
  	list_del_init(&sd->s_sibling);
 	sysfs_put(sd);
 	if (d->d_inode)

@@ -683,6 +695,7 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
 	sd = sysfs_new_dirent("_SHADOW_", inode->i_mode, SYSFS_DIR);
 	if (!sd)
 		goto nomem;
+	init_rwsem(&sd->s_elem.dir.rwsem);
 	sd->s_elem.dir.kobj = kobj;
 	/* point to parent_sd but don't attach to it */
 	sd->s_parent = sysfs_get(parent_sd);

226 lines not on this page · raw message

index b9acf0e..b56186f 100644
@@ -1,4 +1,5 @@
 struct sysfs_elem_dir {
+	struct rw_semaphore	rwsem;
 	struct kobject		* kobj;
 };
 

@@ -42,7 +43,8 @@ extern void sysfs_delete_inode(struct inode *inode);
 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
 
-extern struct kobject *sysfs_get_kobject(struct dentry *dentry);
+extern struct kobject *sysfs_get_dir_kobj(struct sysfs_dirent *sd);
+extern void sysfs_put_dir_kobj(struct sysfs_dirent *sd);
 extern void release_sysfs_dirent(struct sysfs_dirent * sd);
 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,

@@ -86,12 +88,6 @@ struct sysfs_buffer_collection {
 	struct list_head	associates;
 };
 
-static inline struct kobject * to_kobj(struct dentry * dentry)
-{
-	struct sysfs_dirent * sd = dentry->d_fsdata;
-	return sd->s_elem.dir.kobj;
-}
-
 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 {
 	if (sd) {

index 8b1a00a..99a0ba1 100644
@@ -177,40 +177,53 @@ static int init_symlink(struct inode * inode)
 	return 0;
 }
 
-static int create_dir(struct kobject * k, struct dentry * p,
-		      const char * n, struct dentry ** d)
+static int create_dir(struct kobject *kobj, struct dentry *parent,
+		      const char *name, struct dentry **p_dentry)
 {
 	int error;
 	umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
+	struct dentry *dentry;
+	struct sysfs_dirent *sd;
 
-	mutex_lock(&p->d_inode->i_mutex);
-	*d = lookup_one_len(n, p, strlen(n));
-	if (!IS_ERR(*d)) {
- 		if (sysfs_dirent_exist(p->d_fsdata, n))
-  			error = -EEXIST;
-  		else
-			error = sysfs_make_dirent(p->d_fsdata, *d, k, mode,
-								SYSFS_DIR);
-		if (!error) {
-			error = sysfs_create(*d, mode, init_dir);
-			if (!error) {
-				inc_nlink(p->d_inode);
-				(*d)->d_op = &sysfs_dentry_ops;
-				d_rehash(*d);
-			}
-		}
-		if (error && (error != -EEXIST)) {
-			struct sysfs_dirent *sd = (*d)->d_fsdata;
-			if (sd) {
- 				list_del_init(&sd->s_sibling);
-				sysfs_put(sd);
-			}
-			d_drop(*d);
-		}
-		dput(*d);
-	} else
-		error = PTR_ERR(*d);
-	mutex_unlock(&p->d_inode->i_mutex);
+	mutex_lock(&parent->d_inode->i_mutex);
+
+	dentry = lookup_one_len(name, parent, strlen(name));
+	if (IS_ERR(dentry)) {
+		error = PTR_ERR(dentry);
+		goto out_unlock;
+	}
+
+	error = -EEXIST;
+	if (sysfs_dirent_exist(parent->d_fsdata, name))
+		goto out_dput;
+
+	error = sysfs_make_dirent(parent->d_fsdata, dentry, kobj, mode,
+				  SYSFS_DIR);
+	if (error)
+		goto out_drop;
+
+	error = sysfs_create(dentry, mode, init_dir);
+	if (error)
+		goto out_sput;
+
+	inc_nlink(parent->d_inode);
+	dentry->d_op = &sysfs_dentry_ops;
+	d_rehash(dentry);
+
+	*p_dentry = dentry;
+	error = 0;
+	goto out_dput;
+
+ out_sput:
+	sd = dentry->d_fsdata;
+	list_del_init(&sd->s_sibling);
+	sysfs_put(sd);
+ out_drop:
+	d_drop(dentry);
+ out_dput:
+	dput(dentry);
+ out_unlock:
+	mutex_unlock(&parent->d_inode->i_mutex);
 	return error;
 }
 

index 7b9c5bf..b463f17 100644
@@ -49,30 +49,33 @@ static int sysfs_add_link(struct dentry * parent, const char * name, struct kobj
 {
 	struct sysfs_dirent * parent_sd = parent->d_fsdata;
 	struct sysfs_symlink * sl;
-	int error = 0;
+	int error;
 
 	error = -ENOMEM;
-	sl = kmalloc(sizeof(*sl), GFP_KERNEL);
+	sl = kzalloc(sizeof(*sl), GFP_KERNEL);
 	if (!sl)
-		goto exit1;
+		goto err_out;
 
 	sl->link_name = kmalloc(strlen(name) + 1, GFP_KERNEL);
 	if (!sl->link_name)
-		goto exit2;
+		goto err_out;
 
 	strcpy(sl->link_name, name);
 	sl->target_kobj = kobject_get(target);
 
 	error = sysfs_make_dirent(parent_sd, NULL, sl, S_IFLNK|S_IRWXUGO,
 				SYSFS_KOBJ_LINK);
-	if (!error)
-		return 0;
-
-	kobject_put(target);
-	kfree(sl->link_name);
-exit2:
-	kfree(sl);
-exit1:
+	if (error)
+		goto err_out;
+
+	return 0;
+
+ err_out:
+	if (sl) {
+		kobject_put(sl->target_kobj);
+		kfree(sl->link_name);
+		kfree(sl);
+	}
 	return error;
 }
 

index ef45c3e..26c3088 100644
@@ -41,10 +41,11 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 
 	if (sd->s_type & SYSFS_KOBJ_LINK) {
 		struct sysfs_symlink * sl = sd->s_element;
-		kfree(sl->link_name);
 		kobject_put(sl->target_kobj);
 		kfree(sl);
 	}
+	if (sd->s_type & SYSFS_COPY_NAME)
+		kfree(sd->s_name);
 	kfree(sd->s_iattr);
 	kmem_cache_free(sysfs_dir_cachep, sd);
 

@@ -69,19 +70,30 @@ static struct dentry_operations sysfs_dentry_ops = {
 	.d_iput		= sysfs_d_iput,
 };
 
-struct sysfs_dirent *sysfs_new_dirent(void *element, umode_t mode, int type)
+struct sysfs_dirent *sysfs_new_dirent(const char *name, void *element,
+				      umode_t mode, int type)
 {
+	char *dup_name = NULL;
 	struct sysfs_dirent * sd;
 
+	if (type & SYSFS_COPY_NAME) {
+		name = dup_name = kstrdup(name, GFP_KERNEL);
+		if (!name)
+			return NULL;
+	}
+
 	sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL);
-	if (!sd)
+	if (!sd) {
+		kfree(dup_name);
 		return NULL;
+	}
 
 	atomic_set(&sd->s_count, 1);
 	atomic_set(&sd->s_event, 1);
 	INIT_LIST_HEAD(&sd->s_children);
 	INIT_LIST_HEAD(&sd->s_sibling);
 
+	sd->s_name = name;
 	sd->s_element = element;
 	sd->s_mode = mode;
 	sd->s_type = type;

@@ -118,8 +130,7 @@ int sysfs_dirent_exist(struct sysfs_dirent *parent_sd,
 
 	list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
 		if (sd->s_element) {
-			const unsigned char *existing = sysfs_get_name(sd);
-			if (strcmp(existing, new))
+			if (strcmp(sd->s_name, new))
 				continue;
 			else
 				return -EEXIST;

@@ -173,7 +184,7 @@ static int create_dir(struct kobject *kobj, struct dentry *parent,
 		goto out_dput;
 
 	error = -ENOMEM;
-	sd = sysfs_new_dirent(kobj, mode, SYSFS_DIR);
+	sd = sysfs_new_dirent(name, kobj, mode, SYSFS_DIR);
 	if (!sd)
 		goto out_drop;
 	sysfs_attach_dirent(sd, parent->d_fsdata, dentry);

@@ -298,9 +309,7 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
 
 	list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
 		if (sd->s_type & SYSFS_NOT_PINNED) {
-			const unsigned char * name = sysfs_get_name(sd);
-
-			if (strcmp(name, dentry->d_name.name))
+			if (strcmp(sd->s_name, dentry->d_name.name))
 				continue;
 
 			if (sd->s_type & SYSFS_KOBJ_LINK)

@@ -490,7 +499,7 @@ static int sysfs_dir_open(struct inode *inode, struct file *file)
 	struct sysfs_dirent * sd;
 
 	mutex_lock(&dentry->d_inode->i_mutex);
-	sd = sysfs_new_dirent(NULL, 0, 0);
+	sd = sysfs_new_dirent("_DIR_", NULL, 0, 0);
 	if (sd)
 		sysfs_attach_dirent(sd, parent_sd, NULL);
 	mutex_unlock(&dentry->d_inode->i_mutex);

@@ -557,7 +566,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 				if (!next->s_element)
 					continue;
 
-				name = sysfs_get_name(next);
+				name = next->s_name;
 				len = strlen(name);
 				ino = (unsigned long)next;
 

@@ -669,7 +678,7 @@ struct dentry *sysfs_create_shadow_dir(struct kobject *kobj)
 	if (!shadow)
 		goto nomem;
 
-	sd = sysfs_new_dirent(kobj, inode->i_mode, SYSFS_DIR);
+	sd = sysfs_new_dirent("_SHADOW_", kobj, inode->i_mode, SYSFS_DIR);
 	if (!sd)
 		goto nomem;
 	/* point to parent_sd but don't attach to it */

index f6b86a8..62ab272 100644
@@ -484,7 +484,7 @@ int sysfs_add_file(struct dentry * dir, const struct attribute * attr, int type)
 		goto out_unlock;
 	}
 
-	sd = sysfs_new_dirent((void *)attr, mode, type);
+	sd = sysfs_new_dirent(attr->name, (void *)attr, mode, type);
 	if (!sd) {
 		error = -ENOMEM;
 		goto out_unlock;

index b8b010c..4960be8 100644
@@ -190,37 +190,6 @@ int sysfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
 	return error;
 }
 
-/*
- * Get the name for corresponding element represented by the given sysfs_dirent
- */
-const unsigned char * sysfs_get_name(struct sysfs_dirent *sd)
-{
-	struct attribute * attr;
-	struct bin_attribute * bin_attr;
-	struct sysfs_symlink  * sl;
-
-	BUG_ON(!sd || !sd->s_element);
-
-	switch (sd->s_type) {
-		case SYSFS_DIR:
-			/* Always have a dentry so use that */
-			return sd->s_dentry->d_name.name;
-
-		case SYSFS_KOBJ_ATTR:
-			attr = sd->s_element;
-			return attr->name;
-
-		case SYSFS_KOBJ_BIN_ATTR:
-			bin_attr = sd->s_element;
-			return bin_attr->attr.name;
-
-		case SYSFS_KOBJ_LINK:
-			sl = sd->s_element;
-			return sl->link_name;
-	}
-	return NULL;
-}
-
 static inline void orphan_all_buffers(struct inode *node)
 {
 	struct sysfs_buffer_collection *set;

@@ -288,7 +257,7 @@ int sysfs_hash_and_remove(struct dentry * dir, const char * name)
 	list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
 		if (!sd->s_element)
 			continue;
-		if (!strcmp(sysfs_get_name(sd), name)) {
+		if (!strcmp(sd->s_name, name)) {
 			list_del_init(&sd->s_sibling);
 			sysfs_drop_dentry(sd, dir);
 			sysfs_put(sd);

index d96bb9c..c728204 100644
@@ -57,14 +57,9 @@ static int sysfs_add_link(struct dentry * parent, const char * name, struct kobj
 	if (!sl)
 		goto err_out;
 
-	sl->link_name = kmalloc(strlen(name) + 1, GFP_KERNEL);
-	if (!sl->link_name)
-		goto err_out;
-
-	strcpy(sl->link_name, name);
 	sl->target_kobj = kobject_get(target);
 
-	sd = sysfs_new_dirent(sl, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
+	sd = sysfs_new_dirent(name, sl, S_IFLNK|S_IRWXUGO, SYSFS_KOBJ_LINK);
 	if (!sd)
 		goto err_out;
 	sysfs_attach_dirent(sd, parent_sd, NULL);

@@ -74,7 +69,6 @@ static int sysfs_add_link(struct dentry * parent, const char * name, struct kobj
  err_out:
 	if (sl) {
 		kobject_put(sl->target_kobj);
-		kfree(sl->link_name);
 		kfree(sl);
 	}
 	return error;

index b4876de..ac5fd2a 100644
@@ -3,6 +3,7 @@ struct sysfs_dirent {
 	struct sysfs_dirent	* s_parent;
 	struct list_head	s_sibling;
 	struct list_head	s_children;
+	const char		* s_name;
 	void 			* s_element;
 	int			s_type;
 	umode_t			s_mode;

@@ -21,8 +22,8 @@ extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
 extern struct kobject *sysfs_get_kobject(struct dentry *dentry);
 extern void release_sysfs_dirent(struct sysfs_dirent * sd);
 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
-extern struct sysfs_dirent *sysfs_new_dirent(void *element, umode_t mode,
-					     int type);
+extern struct sysfs_dirent *sysfs_new_dirent(const char *name, void *element,
+					     umode_t mode, int type);
 extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
 				struct sysfs_dirent *parent_sd,
 				struct dentry *dentry);

@@ -34,7 +35,6 @@ extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * na
 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
 extern void sysfs_remove_subdir(struct dentry *);
 
-extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd);
 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
 

@@ -47,7 +47,6 @@ extern const struct inode_operations sysfs_dir_inode_operations;
 extern const struct inode_operations sysfs_symlink_inode_operations;
 
 struct sysfs_symlink {
-	char * link_name;
 	struct kobject * target_kobj;
 };
 

index fea9a6b..c79944a 100644
@@ -76,6 +76,7 @@ struct sysfs_ops {
 #define SYSFS_KOBJ_BIN_ATTR	0x0008
 #define SYSFS_KOBJ_LINK 	0x0020
 #define SYSFS_NOT_PINNED	(SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR | SYSFS_KOBJ_LINK)
+#define SYSFS_COPY_NAME		(SYSFS_DIR | SYSFS_KOBJ_LINK)
 
 #ifdef CONFIG_SYSFS
 

index d70ead5..8372c0c 100644
@@ -13,6 +13,7 @@
 #include "sysfs.h"
 
 DECLARE_RWSEM(sysfs_rename_sem);
+spinlock_t kobj_sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
 
 struct kobject *sysfs_get_kobject(struct dentry *dentry)
 {

@@ -388,8 +389,13 @@ static void __sysfs_remove_dir(struct dentry *dentry)
 
 void sysfs_remove_dir(struct kobject * kobj)
 {
-	__sysfs_remove_dir(kobj->dentry);
+	struct dentry *d = kobj->dentry;
+
+	spin_lock(&kobj_sysfs_assoc_lock);
 	kobj->dentry = NULL;
+	spin_unlock(&kobj_sysfs_assoc_lock);
+
+	__sysfs_remove_dir(d);
 }
 
 int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,

index c1965b9..9dcd0b0 100644
@@ -61,6 +61,7 @@ extern void sysfs_remove_subdir(struct dentry *);
 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
 
+extern spinlock_t kobj_sysfs_assoc_lock;
 extern struct rw_semaphore sysfs_rename_sem;
 extern struct super_block * sysfs_sb;
 extern const struct file_operations sysfs_dir_operations;

index 5112f88..8b1a00a 100644
@@ -14,6 +14,36 @@
 
 DECLARE_RWSEM(sysfs_rename_sem);
 
+struct kobject *sysfs_get_kobject(struct dentry *dentry)
+{
+	struct kobject * kobj = NULL;
+
+	spin_lock(&dcache_lock);
+	if (!d_unhashed(dentry)) {
+		struct sysfs_dirent * sd = dentry->d_fsdata;
+		if (sd->s_type & SYSFS_KOBJ_LINK) {
+			struct sysfs_symlink * sl = sd->s_element;
+			kobj = kobject_get(sl->target_kobj);
+		} else
+			kobj = kobject_get(sd->s_element);
+	}
+	spin_unlock(&dcache_lock);
+
+	return kobj;
+}
+
+void release_sysfs_dirent(struct sysfs_dirent * sd)
+{
+	if (sd->s_type & SYSFS_KOBJ_LINK) {
+		struct sysfs_symlink * sl = sd->s_element;
+		kfree(sl->link_name);
+		kobject_put(sl->target_kobj);
+		kfree(sl);
+	}
+	kfree(sd->s_iattr);
+	kmem_cache_free(sysfs_dir_cachep, sd);
+}
+
 static void sysfs_d_iput(struct dentry * dentry, struct inode * inode)
 {
 	struct sysfs_dirent * sd = dentry->d_fsdata;

index a77c57e..812c8c3 100644
@@ -17,6 +17,8 @@ extern void sysfs_delete_inode(struct inode *inode);
 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
 
+extern struct kobject *sysfs_get_kobject(struct dentry *dentry);
+extern void release_sysfs_dirent(struct sysfs_dirent * sd);
 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,
 				umode_t, int);

@@ -79,36 +81,6 @@ static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
 	return ((struct bin_attribute *) sd->s_element);
 }
 
-static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
-{
-	struct kobject * kobj = NULL;
-
-	spin_lock(&dcache_lock);
-	if (!d_unhashed(dentry)) {
-		struct sysfs_dirent * sd = dentry->d_fsdata;
-		if (sd->s_type & SYSFS_KOBJ_LINK) {
-			struct sysfs_symlink * sl = sd->s_element;
-			kobj = kobject_get(sl->target_kobj);
-		} else
-			kobj = kobject_get(sd->s_element);
-	}
-	spin_unlock(&dcache_lock);
-
-	return kobj;
-}
-
-static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
-{
-	if (sd->s_type & SYSFS_KOBJ_LINK) {
-		struct sysfs_symlink * sl = sd->s_element;
-		kfree(sl->link_name);
-		kobject_put(sl->target_kobj);
-		kfree(sl);
-	}
-	kfree(sd->s_iattr);
-	kmem_cache_free(sysfs_dir_cachep, sd);
-}
-
 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 {
 	if (sd) {

index 133a108..cd80b20 100644
@@ -51,29 +51,15 @@ static struct sysfs_ops subsys_sysfs_ops = {
 	.store	= subsys_attr_store,
 };
 
-/**
- *	add_to_collection - add buffer to a collection
- *	@buffer:	buffer to be added
- *	@node:		inode of set to add to
- */
-
-static inline void
-add_to_collection(struct sysfs_buffer *buffer, struct inode *node)
-{
-	struct sysfs_buffer_collection *set = node->i_private;
-
-	mutex_lock(&node->i_mutex);
-	list_add(&buffer->associates, &set->associates);
-	mutex_unlock(&node->i_mutex);
-}
-
-static inline void
-remove_from_collection(struct sysfs_buffer *buffer, struct inode *node)
-{
-	mutex_lock(&node->i_mutex);
-	list_del(&buffer->associates);
-	mutex_unlock(&node->i_mutex);
-}
+struct sysfs_buffer {
+	size_t			count;
+	loff_t			pos;
+	char			* page;
+	struct sysfs_ops	* ops;
+	struct semaphore	sem;
+	int			needs_read_fill;
+	int			event;
+};
 
 /**
  *	fill_read_buffer - allocate and fill buffer from object.

@@ -175,10 +161,7 @@ sysfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 
 	down(&buffer->sem);
 	if (buffer->needs_read_fill) {
-		if (buffer->orphaned)
-			retval = -ENODEV;
-		else
-			retval = fill_read_buffer(file->f_path.dentry,buffer);
+		retval = fill_read_buffer(file->f_path.dentry,buffer);
 		if (retval)
 			goto out;
 	}

@@ -276,16 +259,11 @@ sysfs_write_file(struct file *file, const char __user *buf, size_t count, loff_t
 	ssize_t len;
 
 	down(&buffer->sem);
-	if (buffer->orphaned) {
-		len = -ENODEV;
-		goto out;
-	}
 	len = fill_write_buffer(buffer, buf, count);
 	if (len > 0)
 		len = flush_write_buffer(file->f_path.dentry, buffer, len);
 	if (len > 0)
 		*ppos += len;
-out:
 	up(&buffer->sem);
 	return len;
 }

@@ -294,7 +272,6 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 {
 	struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
 	struct attribute *attr = attr_sd->s_elem.attr.attr;
-	struct sysfs_buffer_collection *set;
 	struct sysfs_buffer * buffer;
 	struct sysfs_ops * ops = NULL;
 	struct kobject *kobj;

@@ -322,26 +299,14 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 	else
 		ops = &subsys_sysfs_ops;
 
+	error = -EACCES;
+
 	/* No sysfs operations, either from having no subsystem,
 	 * or the subsystem have no operations.
 	 */
-	error = -EACCES;
 	if (!ops)
 		goto err_mput;
 
-	/* make sure we have a collection to add our buffers to */
-	mutex_lock(&inode->i_mutex);
-	if (!(set = inode->i_private)) {
-		error = -ENOMEM;
-		if (!(set = inode->i_private = kmalloc(sizeof(struct sysfs_buffer_collection), GFP_KERNEL)))
-			goto err_mput;
-		else
-			INIT_LIST_HEAD(&set->associates);
-	}
-	mutex_unlock(&inode->i_mutex);
-
-	error = -EACCES;
-
 	/* File needs write support.
 	 * The inode's perms must say it's ok, 
 	 * and we must have a store method.

@@ -368,11 +333,9 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 	if (!buffer)
 		goto err_mput;
 
-	INIT_LIST_HEAD(&buffer->associates);
 	init_MUTEX(&buffer->sem);
 	buffer->needs_read_fill = 1;
 	buffer->ops = ops;
-	add_to_collection(buffer, inode);
 	file->private_data = buffer;
 
 	/* open succeeded, put kobj and pin attr_sd */

@@ -391,10 +354,8 @@ static int sysfs_release(struct inode * inode, struct file * filp)
 {
 	struct sysfs_dirent *attr_sd = filp->f_path.dentry->d_fsdata;
 	struct attribute *attr = attr_sd->s_elem.attr.attr;
-	struct sysfs_buffer * buffer = filp->private_data;
+	struct sysfs_buffer *buffer = filp->private_data;
 
-	if (buffer)
-		remove_from_collection(buffer, inode);
 	sysfs_put(attr_sd);
 	/* After this point, attr should not be accessed. */
 	module_put(attr->owner);

index 2581bfa..e4eb116 100644
@@ -190,24 +190,6 @@ int sysfs_create(struct dentry * dentry, int mode, int (*init)(struct inode *))
 	return error;
 }
 
-static inline void orphan_all_buffers(struct inode *node)
-{
-	struct sysfs_buffer_collection *set;
-	struct sysfs_buffer *buf;
-
-	mutex_lock_nested(&node->i_mutex, I_MUTEX_CHILD);
-	set = node->i_private;
-	if (set) {
-		list_for_each_entry(buf, &set->associates, associates) {
-			down(&buf->sem);
-			buf->orphaned = 1;
-			up(&buf->sem);
-		}
-	}
-	mutex_unlock(&node->i_mutex);
-}
-
-
 /*
  * Unhashes the dentry corresponding to given sysfs_dirent
  * Called with parent inode's i_mutex held.

@@ -215,23 +197,16 @@ static inline void orphan_all_buffers(struct inode *node)
 void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent)
 {
 	struct dentry * dentry = sd->s_dentry;
-	struct inode *inode;
 
 	if (dentry) {
 		spin_lock(&dcache_lock);
 		spin_lock(&dentry->d_lock);
 		if (!(d_unhashed(dentry) && dentry->d_inode)) {
-			inode = dentry->d_inode;
-			spin_lock(&inode->i_lock);
-			__iget(inode);
-			spin_unlock(&inode->i_lock);
 			dget_locked(dentry);
 			__d_drop(dentry);
 			spin_unlock(&dentry->d_lock);
 			spin_unlock(&dcache_lock);
 			simple_unlink(parent->d_inode, dentry);
-			orphan_all_buffers(inode);
-			iput(inode);
 		} else {
 			spin_unlock(&dentry->d_lock);
 			spin_unlock(&dcache_lock);

index 0defb3a..09edcad 100644
@@ -19,12 +19,9 @@ struct vfsmount *sysfs_mount;
 struct super_block * sysfs_sb = NULL;
 struct kmem_cache *sysfs_dir_cachep;
 
-static void sysfs_clear_inode(struct inode *inode);
-
 static const struct super_operations sysfs_ops = {
 	.statfs		= simple_statfs,
 	.drop_inode	= sysfs_delete_inode,
-	.clear_inode	= sysfs_clear_inode,
 };
 
 static struct sysfs_dirent sysfs_root = {

@@ -35,11 +32,6 @@ static struct sysfs_dirent sysfs_root = {
 	.s_iattr	= NULL,
 };
 
-static void sysfs_clear_inode(struct inode *inode)
-{
-	kfree(inode->i_private);
-}
-
 static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct inode *inode;

index b56186f..6802576 100644
@@ -72,22 +72,6 @@ extern const struct file_operations bin_fops;
 extern const struct inode_operations sysfs_dir_inode_operations;
 extern const struct inode_operations sysfs_symlink_inode_operations;
 
-struct sysfs_buffer {
-	struct list_head		associates;
-	size_t				count;
-	loff_t				pos;
-	char				* page;
-	struct sysfs_ops		* ops;
-	struct semaphore		sem;
-	int				orphaned;
-	int				needs_read_fill;
-	int				event;
-};
-
-struct sysfs_buffer_collection {
-	struct list_head	associates;
-};
-
 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 {
 	if (sd) {

index 8372c0c..b7d0e0e 100644
@@ -22,10 +22,11 @@ struct kobject *sysfs_get_kobject(struct dentry *dentry)
 	spin_lock(&dcache_lock);
 	if (!d_unhashed(dentry)) {
 		struct sysfs_dirent * sd = dentry->d_fsdata;
+
 		if (sd->s_type & SYSFS_KOBJ_LINK)
-			kobj = kobject_get(sd->s_elem.symlink.target_kobj);
-		else
-			kobj = kobject_get(sd->s_elem.dir.kobj);
+			sd = sd->s_elem.symlink.target_sd;
+
+		kobj = kobject_get(sd->s_elem.dir.kobj);
 	}
 	spin_unlock(&dcache_lock);
 

@@ -40,7 +41,7 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 	parent_sd = sd->s_parent;
 
 	if (sd->s_type & SYSFS_KOBJ_LINK)
-		kobject_put(sd->s_elem.symlink.target_kobj);
+		sysfs_put(sd->s_elem.symlink.target_sd);
 	if (sd->s_type & SYSFS_COPY_NAME)
 		kfree(sd->s_name);
 	kfree(sd->s_iattr);

162 lines not on this page · raw message

index 9dcd0b0..b9acf0e 100644
@@ -3,7 +3,7 @@ struct sysfs_elem_dir {
 };
 
 struct sysfs_elem_symlink {
-	struct kobject		* target_kobj;
+	struct sysfs_dirent	* target_sd;
 };
 
 struct sysfs_elem_attr {