sysfs and driver core patches for 2.6.22

index ec8896b..1d533a2 100644
@@ -368,6 +368,69 @@ void debugfs_remove(struct dentry *dentry)
 }
 EXPORT_SYMBOL_GPL(debugfs_remove);
 
+/**
+ * debugfs_rename - rename a file/directory in the debugfs filesystem
+ * @old_dir: a pointer to the parent dentry for the renamed object. This
+ *          should be a directory dentry.
+ * @old_dentry: dentry of an object to be renamed.
+ * @new_dir: a pointer to the parent dentry where the object should be
+ *          moved. This should be a directory dentry.
+ * @new_name: a pointer to a string containing the target name.
+ *
+ * This function renames a file/directory in debugfs.  The target must not
+ * exist for rename to succeed.
+ *
+ * This function will return a pointer to old_dentry (which is updated to
+ * reflect renaming) if it succeeds. If an error occurs, %NULL will be
+ * returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -%ENODEV will be
+ * returned.
+ */
+struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+		struct dentry *new_dir, const char *new_name)
+{
+	int error;
+	struct dentry *dentry = NULL, *trap;
+	const char *old_name;
+
+	trap = lock_rename(new_dir, old_dir);
+	/* Source or destination directories don't exist? */
+	if (!old_dir->d_inode || !new_dir->d_inode)
+		goto exit;
+	/* Source does not exist, cyclic rename, or mountpoint? */
+	if (!old_dentry->d_inode || old_dentry == trap ||
+	    d_mountpoint(old_dentry))
+		goto exit;
+	dentry = lookup_one_len(new_name, new_dir, strlen(new_name));
+	/* Lookup failed, cyclic rename or target exists? */
+	if (IS_ERR(dentry) || dentry == trap || dentry->d_inode)
+		goto exit;
+
+	old_name = fsnotify_oldname_init(old_dentry->d_name.name);
+
+	error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode,
+		dentry);
+	if (error) {
+		fsnotify_oldname_free(old_name);
+		goto exit;
+	}
+	d_move(old_dentry, dentry);
+	fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name,
+		old_dentry->d_name.name, S_ISDIR(old_dentry->d_inode->i_mode),
+		NULL, old_dentry->d_inode);
+	fsnotify_oldname_free(old_name);
+	unlock_rename(new_dir, old_dir);
+	dput(dentry);
+	return old_dentry;
+exit:
+	if (dentry && !IS_ERR(dentry))
+		dput(dentry);
+	unlock_rename(new_dir, old_dir);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(debugfs_rename);
+
 static decl_subsys(debug, NULL, NULL);
 
 static int __init debugfs_init(void)

index 5a9c495..104e51e 100644
@@ -38,6 +38,9 @@ struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
 
 void debugfs_remove(struct dentry *dentry);
 
+struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+                struct dentry *new_dir, const char *new_name);
+
 struct dentry *debugfs_create_u8(const char *name, mode_t mode,
 				 struct dentry *parent, u8 *value);
 struct dentry *debugfs_create_u16(const char *name, mode_t mode,

@@ -85,6 +88,12 @@ static inline struct dentry *debugfs_create_symlink(const char *name,
 static inline void debugfs_remove(struct dentry *dentry)
 { }
 
+static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
+                struct dentry *new_dir, char *new_name)
+{
+	return ERR_PTR(-ENODEV);
+}
+
 static inline struct dentry *debugfs_create_u8(const char *name, mode_t mode,
 					       struct dentry *parent,
 					       u8 *value)

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index 904bf3d..b8ac7b0 100644
@@ -12,9 +12,17 @@ enum dmi_field {
 	DMI_PRODUCT_NAME,
 	DMI_PRODUCT_VERSION,
 	DMI_PRODUCT_SERIAL,
+	DMI_PRODUCT_UUID,
 	DMI_BOARD_VENDOR,
 	DMI_BOARD_NAME,
 	DMI_BOARD_VERSION,
+	DMI_BOARD_SERIAL,
+	DMI_BOARD_ASSET_TAG,
+	DMI_CHASSIS_VENDOR,
+	DMI_CHASSIS_TYPE,
+	DMI_CHASSIS_VERSION,
+	DMI_CHASSIS_SERIAL,
+	DMI_CHASSIS_ASSET_TAG,
 	DMI_STRING_MAX,
 };
 

index dca7348..7ff5aaf 100644
@@ -138,12 +138,24 @@ void bus_remove_file(struct bus_type * bus, struct bus_attribute * attr)
 	}
 }
 
-static struct kobj_type ktype_bus = {
+static struct kobj_type bus_ktype = {
 	.sysfs_ops	= &bus_sysfs_ops,
+};
+
+static int bus_uevent_filter(struct kset *kset, struct kobject *kobj)
+{
+	struct kobj_type *ktype = get_ktype(kobj);
+
+	if (ktype == &bus_ktype)
+		return 1;
+	return 0;
+}
 
+static struct kset_uevent_ops bus_uevent_ops = {
+	.filter = bus_uevent_filter,
 };
 
-static decl_subsys(bus, &ktype_bus, NULL);
+static decl_subsys(bus, &bus_ktype, &bus_uevent_ops);
 
 
 #ifdef CONFIG_HOTPLUG

index ac15206..b4ebd76 100644
@@ -597,10 +597,17 @@ int kset_add(struct kset * k)
 
 int kset_register(struct kset * k)
 {
+	int err;
+
 	if (!k)
 		return -EINVAL;
+
 	kset_init(k);
-	return kset_add(k);
+	err = kset_add(k);
+	if (err)
+		return err;
+	kobject_uevent(&k->kobj, KOBJ_ADD);
+	return 0;
 }
 
 

index 29f1291..18febe2 100644
@@ -21,7 +21,7 @@
 #include <linux/string.h>
 #include <linux/pm.h>
 #include <linux/device.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
 
 #include "base.h"
 

@@ -155,7 +155,7 @@ EXPORT_SYMBOL_GPL(sysdev_class_unregister);
 
 
 static LIST_HEAD(sysdev_drivers);
-static DECLARE_MUTEX(sysdev_drivers_lock);
+static DEFINE_MUTEX(sysdev_drivers_lock);
 
 /**
  *	sysdev_driver_register - Register auxillary driver

@@ -172,7 +172,7 @@ static DECLARE_MUTEX(sysdev_drivers_lock);
 int sysdev_driver_register(struct sysdev_class * cls,
 			   struct sysdev_driver * drv)
 {
-	down(&sysdev_drivers_lock);
+	mutex_lock(&sysdev_drivers_lock);
 	if (cls && kset_get(&cls->kset)) {
 		list_add_tail(&drv->entry, &cls->drivers);
 

@@ -184,7 +184,7 @@ int sysdev_driver_register(struct sysdev_class * cls,
 		}
 	} else
 		list_add_tail(&drv->entry, &sysdev_drivers);
-	up(&sysdev_drivers_lock);
+	mutex_unlock(&sysdev_drivers_lock);
 	return 0;
 }
 

@@ -197,7 +197,7 @@ int sysdev_driver_register(struct sysdev_class * cls,
 void sysdev_driver_unregister(struct sysdev_class * cls,
 			      struct sysdev_driver * drv)
 {
-	down(&sysdev_drivers_lock);
+	mutex_lock(&sysdev_drivers_lock);
 	list_del_init(&drv->entry);
 	if (cls) {
 		if (drv->remove) {

@@ -207,7 +207,7 @@ void sysdev_driver_unregister(struct sysdev_class * cls,
 		}
 		kset_put(&cls->kset);
 	}
-	up(&sysdev_drivers_lock);
+	mutex_unlock(&sysdev_drivers_lock);
 }
 
 EXPORT_SYMBOL_GPL(sysdev_driver_register);

@@ -246,7 +246,7 @@ int sysdev_register(struct sys_device * sysdev)
 	if (!error) {
 		struct sysdev_driver * drv;
 
-		down(&sysdev_drivers_lock);
+		mutex_lock(&sysdev_drivers_lock);
 		/* Generic notification is implicit, because it's that
 		 * code that should have called us.
 		 */

@@ -262,7 +262,7 @@ int sysdev_register(struct sys_device * sysdev)
 			if (drv->add)
 				drv->add(sysdev);
 		}
-		up(&sysdev_drivers_lock);
+		mutex_unlock(&sysdev_drivers_lock);
 	}
 	return error;
 }

@@ -271,7 +271,7 @@ void sysdev_unregister(struct sys_device * sysdev)
 {
 	struct sysdev_driver * drv;
 
-	down(&sysdev_drivers_lock);
+	mutex_lock(&sysdev_drivers_lock);
 	list_for_each_entry(drv, &sysdev_drivers, entry) {
 		if (drv->remove)
 			drv->remove(sysdev);

@@ -281,7 +281,7 @@ void sysdev_unregister(struct sys_device * sysdev)
 		if (drv->remove)
 			drv->remove(sysdev);
 	}
-	up(&sysdev_drivers_lock);
+	mutex_unlock(&sysdev_drivers_lock);
 
 	kobject_unregister(&sysdev->kobj);
 }

@@ -308,7 +308,7 @@ void sysdev_shutdown(void)
 
 	pr_debug("Shutting Down System Devices\n");
 
-	down(&sysdev_drivers_lock);
+	mutex_lock(&sysdev_drivers_lock);
 	list_for_each_entry_reverse(cls, &system_subsys.list,
 				    kset.kobj.entry) {
 		struct sys_device * sysdev;

@@ -337,7 +337,7 @@ void sysdev_shutdown(void)
 				cls->shutdown(sysdev);
 		}
 	}
-	up(&sysdev_drivers_lock);
+	mutex_unlock(&sysdev_drivers_lock);
 }
 
 static void __sysdev_resume(struct sys_device *dev)

index 05dc876..7b3cc3c 100644
@@ -20,14 +20,16 @@
  */
 
 #include <linux/device.h>
+#include <linux/mutex.h>
+
 #include "power.h"
 
 LIST_HEAD(dpm_active);
 LIST_HEAD(dpm_off);
 LIST_HEAD(dpm_off_irq);
 
-DECLARE_MUTEX(dpm_sem);
-DECLARE_MUTEX(dpm_list_sem);
+DEFINE_MUTEX(dpm_mtx);
+DEFINE_MUTEX(dpm_list_mtx);
 
 int (*platform_enable_wakeup)(struct device *dev, int is_on);
 

@@ -59,12 +61,12 @@ int device_pm_add(struct device * dev)
 	pr_debug("PM: Adding info for %s:%s\n",
 		 dev->bus ? dev->bus->name : "No Bus",
 		 kobject_name(&dev->kobj));
-	down(&dpm_list_sem);
+	mutex_lock(&dpm_list_mtx);
 	list_add_tail(&dev->power.entry, &dpm_active);
 	device_pm_set_parent(dev, dev->parent);
 	if ((error = dpm_sysfs_add(dev)))
 		list_del(&dev->power.entry);
-	up(&dpm_list_sem);
+	mutex_unlock(&dpm_list_mtx);
 	return error;
 }
 

@@ -73,11 +75,11 @@ void device_pm_remove(struct device * dev)
 	pr_debug("PM: Removing info for %s:%s\n",
 		 dev->bus ? dev->bus->name : "No Bus",
 		 kobject_name(&dev->kobj));
-	down(&dpm_list_sem);
+	mutex_lock(&dpm_list_mtx);
 	dpm_sysfs_remove(dev);
 	put_device(dev->power.pm_parent);
 	list_del_init(&dev->power.entry);
-	up(&dpm_list_sem);
+	mutex_unlock(&dpm_list_mtx);
 }
 
 

index fb3d35a..2760f25 100644
@@ -14,12 +14,12 @@ extern void device_shutdown(void);
 /*
  * Used to synchronize global power management operations.
  */
-extern struct semaphore dpm_sem;
+extern struct mutex dpm_mtx;
 
 /*
  * Used to serialize changes to the dpm_* lists.
  */
-extern struct semaphore dpm_list_sem;
+extern struct mutex dpm_list_mtx;
 
 /*
  * The PM lists.

index a2c6418..f6cfea4 100644
@@ -80,7 +80,7 @@ static int resume_device_early(struct device * dev)
  */
 void dpm_resume(void)
 {
-	down(&dpm_list_sem);
+	mutex_lock(&dpm_list_mtx);
 	while(!list_empty(&dpm_off)) {
 		struct list_head * entry = dpm_off.next;
 		struct device * dev = to_device(entry);

@@ -88,13 +88,13 @@ void dpm_resume(void)
 		get_device(dev);
 		list_move_tail(entry, &dpm_active);
 
-		up(&dpm_list_sem);
+		mutex_unlock(&dpm_list_mtx);
 		if (!dev->power.prev_state.event)
 			resume_device(dev);
-		down(&dpm_list_sem);
+		mutex_lock(&dpm_list_mtx);
 		put_device(dev);
 	}
-	up(&dpm_list_sem);
+	mutex_unlock(&dpm_list_mtx);
 }
 
 

@@ -108,9 +108,9 @@ void dpm_resume(void)
 void device_resume(void)
 {
 	might_sleep();
-	down(&dpm_sem);
+	mutex_lock(&dpm_mtx);
 	dpm_resume();
-	up(&dpm_sem);
+	mutex_unlock(&dpm_mtx);
 }
 
 EXPORT_SYMBOL_GPL(device_resume);

index 96370ec..df6174d 100644
@@ -32,9 +32,9 @@ static void runtime_resume(struct device * dev)
 
 void dpm_runtime_resume(struct device * dev)
 {
-	down(&dpm_sem);
+	mutex_lock(&dpm_mtx);
 	runtime_resume(dev);
-	up(&dpm_sem);
+	mutex_unlock(&dpm_mtx);
 }
 EXPORT_SYMBOL(dpm_runtime_resume);
 

@@ -49,7 +49,7 @@ int dpm_runtime_suspend(struct device * dev, pm_message_t state)
 {
 	int error = 0;
 
-	down(&dpm_sem);
+	mutex_lock(&dpm_mtx);
 	if (dev->power.power_state.event == state.event)
 		goto Done;
 

@@ -59,7 +59,7 @@ int dpm_runtime_suspend(struct device * dev, pm_message_t state)
 	if (!(error = suspend_device(dev, state)))
 		dev->power.power_state = state;
  Done:
-	up(&dpm_sem);
+	mutex_unlock(&dpm_mtx);
 	return error;
 }
 EXPORT_SYMBOL(dpm_runtime_suspend);

@@ -78,8 +78,8 @@ EXPORT_SYMBOL(dpm_runtime_suspend);
  */
 void dpm_set_power_state(struct device * dev, pm_message_t state)
 {
-	down(&dpm_sem);
+	mutex_lock(&dpm_mtx);
 	dev->power.power_state = state;
-	up(&dpm_sem);
+	mutex_unlock(&dpm_mtx);
 }
 #endif  /*  0  */

index 42d2b86..9d6701c 100644
@@ -108,7 +108,7 @@ int suspend_device(struct device * dev, pm_message_t state)
 
 /*
  * This is called with interrupts off, only a single CPU
- * running. We can't do down() on a semaphore (and we don't
+ * running. We can't acquire a mutex or semaphore (and we don't
  * need the protection)
  */
 static int suspend_device_late(struct device *dev, pm_message_t state)

@@ -153,18 +153,18 @@ int device_suspend(pm_message_t state)
 	int error = 0;
 
 	might_sleep();
-	down(&dpm_sem);
-	down(&dpm_list_sem);
+	mutex_lock(&dpm_mtx);
+	mutex_lock(&dpm_list_mtx);
 	while (!list_empty(&dpm_active) && error == 0) {
 		struct list_head * entry = dpm_active.prev;
 		struct device * dev = to_device(entry);
 
 		get_device(dev);
-		up(&dpm_list_sem);
+		mutex_unlock(&dpm_list_mtx);
 
 		error = suspend_device(dev, state);
 
-		down(&dpm_list_sem);
+		mutex_lock(&dpm_list_mtx);
 
 		/* Check if the device got removed */
 		if (!list_empty(&dev->power.entry)) {

@@ -179,11 +179,11 @@ int device_suspend(pm_message_t state)
 				error == -EAGAIN ? " (please convert to suspend_late)" : "");
 		put_device(dev);
 	}
-	up(&dpm_list_sem);
+	mutex_unlock(&dpm_list_mtx);
 	if (error)
 		dpm_resume();
 
-	up(&dpm_sem);
+	mutex_unlock(&dpm_mtx);
 	return error;
 }
 

index 7b3cc3c..eb9f38d 100644
@@ -33,28 +33,7 @@ DEFINE_MUTEX(dpm_list_mtx);
 
 int (*platform_enable_wakeup)(struct device *dev, int is_on);
 
-
-/**
- *	device_pm_set_parent - Specify power dependency.
- *	@dev:		Device who needs power.
- *	@parent:	Device that supplies power.
- *
- *	This function is used to manually describe a power-dependency
- *	relationship. It may be used to specify a transversal relationship
- *	(where the power supplier is not the physical (or electrical)
- *	ancestor of a specific device.
- *	The effect of this is that the supplier will not be powered down
- *	before the power dependent.
- */
-
-void device_pm_set_parent(struct device * dev, struct device * parent)
-{
-	put_device(dev->power.pm_parent);
-	dev->power.pm_parent = get_device(parent);
-}
-EXPORT_SYMBOL_GPL(device_pm_set_parent);
-
-int device_pm_add(struct device * dev)
+int device_pm_add(struct device *dev)
 {
 	int error;
 

@@ -63,21 +42,20 @@ int device_pm_add(struct device * dev)
 		 kobject_name(&dev->kobj));
 	mutex_lock(&dpm_list_mtx);
 	list_add_tail(&dev->power.entry, &dpm_active);
-	device_pm_set_parent(dev, dev->parent);
-	if ((error = dpm_sysfs_add(dev)))
+	error = dpm_sysfs_add(dev);
+	if (error)
 		list_del(&dev->power.entry);
 	mutex_unlock(&dpm_list_mtx);
 	return error;
 }
 
-void device_pm_remove(struct device * dev)
+void device_pm_remove(struct device *dev)
 {
 	pr_debug("PM: Removing info for %s:%s\n",
 		 dev->bus ? dev->bus->name : "No Bus",
 		 kobject_name(&dev->kobj));
 	mutex_lock(&dpm_list_mtx);
 	dpm_sysfs_remove(dev);
-	put_device(dev->power.pm_parent);
 	list_del_init(&dev->power.entry);
 	mutex_unlock(&dpm_list_mtx);
 }

index f6cfea4..99679e7 100644
@@ -29,12 +29,11 @@ int resume_device(struct device * dev)
 
 	down(&dev->sem);
 
-	if (dev->power.pm_parent
-			&& dev->power.pm_parent->power.power_state.event) {
+	if (dev->parent && dev->parent->power.power_state.event) {
 		dev_err(dev, "PM: resume from %d, parent %s still %d\n",
 			dev->power.power_state.event,
-			dev->power.pm_parent->bus_id,
-			dev->power.pm_parent->power.power_state.event);
+			dev->parent->bus_id,
+			dev->parent->power.power_state.event);
 	}
 
 	if (dev->bus && dev->bus->resume) {

index 9d6701c..19fae88 100644
@@ -55,13 +55,12 @@ int suspend_device(struct device * dev, pm_message_t state)
 		dev_dbg(dev, "PM: suspend %d-->%d\n",
 			dev->power.power_state.event, state.event);
 	}
-	if (dev->power.pm_parent
-			&& dev->power.pm_parent->power.power_state.event) {
+	if (dev->parent && dev->parent->power.power_state.event) {
 		dev_err(dev,
 			"PM: suspend %d->%d, parent %s already %d\n",
 			dev->power.power_state.event, state.event,
-			dev->power.pm_parent->bus_id,
-			dev->power.pm_parent->power.power_state.event);
+			dev->parent->bus_id,
+			dev->parent->power.power_state.event);
 	}
 
 	dev->power.prev_state = dev->power.power_state;

index b2c4fde..3fd65ad 100644
@@ -269,13 +269,10 @@ struct dev_pm_info {
 	unsigned		should_wakeup:1;
 	pm_message_t		prev_state;
 	void			* saved_state;
-	struct device		* pm_parent;
 	struct list_head	entry;
 #endif
 };
 
-extern void device_pm_set_parent(struct device * dev, struct device * parent);
-
 extern int device_power_down(pm_message_t state);
 extern void device_power_up(void);
 extern void device_resume(void);

index 3fd65ad..6e7f066 100644
@@ -268,7 +268,6 @@ struct dev_pm_info {
 #ifdef	CONFIG_PM
 	unsigned		should_wakeup:1;
 	pm_message_t		prev_state;
-	void			* saved_state;
 	struct list_head	entry;
 #endif
 };

index 19fae88..af2cedf 100644
@@ -40,6 +40,14 @@ static inline char *suspend_verb(u32 event)
 }
 
 
+static void
+suspend_device_dbg(struct device *dev, pm_message_t state, char *info)
+{
+	dev_dbg(dev, "%s%s%s\n", info, suspend_verb(state.event),
+		((state.event == PM_EVENT_SUSPEND) && device_may_wakeup(dev)) ?
+		", may wakeup" : "");
+}
+
 /**
  *	suspend_device - Save state of one device.
  *	@dev:	Device.

@@ -66,37 +74,21 @@ int suspend_device(struct device * dev, pm_message_t state)
 	dev->power.prev_state = dev->power.power_state;
 
 	if (dev->class && dev->class->suspend && !dev->power.power_state.event) {
-		dev_dbg(dev, "class %s%s\n",
-			suspend_verb(state.event),
-			((state.event == PM_EVENT_SUSPEND)
-					&& device_may_wakeup(dev))
-				? ", may wakeup"
-				: ""
-			);
+		suspend_device_dbg(dev, state, "class ");
 		error = dev->class->suspend(dev, state);
 		suspend_report_result(dev->class->suspend, error);
 	}
 
-	if (!error && dev->type && dev->type->suspend && !dev->power.power_state.event) {
-		dev_dbg(dev, "%s%s\n",
-			suspend_verb(state.event),
-			((state.event == PM_EVENT_SUSPEND)
-					&& device_may_wakeup(dev))
-				? ", may wakeup"
-				: ""
-			);
+	if (!error && dev->type && dev->type->suspend
+	    && !dev->power.power_state.event) {
+		suspend_device_dbg(dev, state, "type ");
 		error = dev->type->suspend(dev, state);
 		suspend_report_result(dev->type->suspend, error);
 	}
 
-	if (!error && dev->bus && dev->bus->suspend && !dev->power.power_state.event) {
-		dev_dbg(dev, "%s%s\n",
-			suspend_verb(state.event),
-			((state.event == PM_EVENT_SUSPEND)
-					&& device_may_wakeup(dev))
-				? ", may wakeup"
-				: ""
-			);
+	if (!error && dev->bus && dev->bus->suspend
+	    && !dev->power.power_state.event) {
+		suspend_device_dbg(dev, state, "");
 		error = dev->bus->suspend(dev, state);
 		suspend_report_result(dev->bus->suspend, error);
 	}

@@ -114,14 +106,9 @@ static int suspend_device_late(struct device *dev, pm_message_t state)
 {
 	int error = 0;
 
-	if (dev->bus && dev->bus->suspend_late && !dev->power.power_state.event) {
-		dev_dbg(dev, "LATE %s%s\n",
-			suspend_verb(state.event),
-			((state.event == PM_EVENT_SUSPEND)
-					&& device_may_wakeup(dev))
-				? ", may wakeup"
-				: ""
-			);
+	if (dev->bus && dev->bus->suspend_late
+	    && !dev->power.power_state.event) {
+		suspend_device_dbg(dev, state, "LATE ");
 		error = dev->bus->suspend_late(dev, state);
 		suspend_report_result(dev->bus->suspend_late, error);
 	}

index 1ec0654..7370d7c 100644
@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 
 #include "base.h"
 

index b0088b0..3c503e1 100644
@@ -296,9 +296,8 @@ static void __device_release_driver(struct device * dev)
 {
 	struct device_driver * drv;
 
-	drv = dev->driver;
+	drv = get_driver(dev->driver);
 	if (drv) {
-		get_driver(drv);
 		driver_sysfs_remove(dev);
 		sysfs_remove_link(&dev->kobj, "driver");
 		klist_remove(&dev->knode_driver);

index 3c503e1..7ac474d 100644
@@ -281,17 +281,10 @@ int driver_attach(struct device_driver * drv)
 	return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);
 }
 
-/**
- *	device_release_driver - manually detach device from driver.
- *	@dev:	device.
- *
- *	Manually detach device from driver.
- *
+/*
  *	__device_release_driver() must be called with @dev->sem held.
- *	When called for a USB interface, @dev->parent->sem must be held
- *	as well.
+ *	When called for a USB interface, @dev->parent->sem must be held as well.
  */
-
 static void __device_release_driver(struct device * dev)
 {
 	struct device_driver * drv;

@@ -317,6 +310,13 @@ static void __device_release_driver(struct device * dev)
 	}
 }
 
+/**
+ *	device_release_driver - manually detach device from driver.
+ *	@dev:	device.
+ *
+ *	Manually detach device from driver.
+ *	When called for a USB interface, @dev->parent->sem must be held.
+ */
 void device_release_driver(struct device * dev)
 {
 	/*

index 5512d84..47eb02d 100644
@@ -44,6 +44,6 @@ struct class_device_attribute *to_class_dev_attr(struct attribute *_attr)
 
 extern char *make_class_name(const char *name, struct kobject *kobj);
 
-extern void devres_release_all(struct device *dev);
+extern int devres_release_all(struct device *dev);
 
 extern struct kset devices_subsys;

index e1c0730..e8beb8e 100644
@@ -10,6 +10,8 @@
 #include <linux/device.h>
 #include <linux/module.h>
 
+#include "base.h"
+
 struct devres_node {
 	struct list_head		entry;
 	dr_release_t			release;

index 99679e7..0c96106 100644
@@ -88,8 +88,7 @@ void dpm_resume(void)
 		list_move_tail(entry, &dpm_active);
 
 		mutex_unlock(&dpm_list_mtx);
-		if (!dev->power.prev_state.event)
-			resume_device(dev);
+		resume_device(dev);
 		mutex_lock(&dpm_list_mtx);
 		put_device(dev);
 	}

index af2cedf..5178b0f 100644
@@ -71,8 +71,6 @@ int suspend_device(struct device * dev, pm_message_t state)
 			dev->parent->power.power_state.event);
 	}
 
-	dev->power.prev_state = dev->power.power_state;
-
 	if (dev->class && dev->class->suspend && !dev->power.power_state.event) {
 		suspend_device_dbg(dev, state, "class ");
 		error = dev->class->suspend(dev, state);

index 24f10a1..a9cf8b3 100644
@@ -1109,11 +1109,6 @@ void usb_root_hub_lost_power(struct usb_device *rhdev)
 
 	dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
 
-	/* Make sure no potential wakeup events get lost,
-	 * by forcing the root hub to be resumed.
-	 */
-	rhdev->dev.power.prev_state.event = PM_EVENT_ON;
-
 	spin_lock_irqsave(&device_state_lock, flags);
 	hub = hdev_to_hub(rhdev);
 	for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {

index 6e7f066..273781c 100644
@@ -267,7 +267,6 @@ struct dev_pm_info {
 	unsigned		can_wakeup:1;
 #ifdef	CONFIG_PM
 	unsigned		should_wakeup:1;
-	pm_message_t		prev_state;
 	struct list_head	entry;
 #endif
 };

index 5178b0f..a3ff394 100644
@@ -71,21 +71,19 @@ int suspend_device(struct device * dev, pm_message_t state)
 			dev->parent->power.power_state.event);
 	}
 
-	if (dev->class && dev->class->suspend && !dev->power.power_state.event) {
+	if (dev->class && dev->class->suspend) {
 		suspend_device_dbg(dev, state, "class ");
 		error = dev->class->suspend(dev, state);
 		suspend_report_result(dev->class->suspend, error);
 	}
 
-	if (!error && dev->type && dev->type->suspend
-	    && !dev->power.power_state.event) {
+	if (!error && dev->type && dev->type->suspend) {
 		suspend_device_dbg(dev, state, "type ");
 		error = dev->type->suspend(dev, state);
 		suspend_report_result(dev->type->suspend, error);
 	}
 
-	if (!error && dev->bus && dev->bus->suspend
-	    && !dev->power.power_state.event) {
+	if (!error && dev->bus && dev->bus->suspend) {
 		suspend_device_dbg(dev, state, "");
 		error = dev->bus->suspend(dev, state);
 		suspend_report_result(dev->bus->suspend, error);

@@ -104,8 +102,7 @@ static int suspend_device_late(struct device *dev, pm_message_t state)
 {
 	int error = 0;
 
-	if (dev->bus && dev->bus->suspend_late
-	    && !dev->power.power_state.event) {
+	if (dev->bus && dev->bus->suspend_late) {
 		suspend_device_dbg(dev, state, "LATE ");
 		error = dev->bus->suspend_late(dev, state);
 		suspend_report_result(dev->bus->suspend_late, error);

index 0c96106..00fd84a 100644
@@ -29,13 +29,6 @@ int resume_device(struct device * dev)
 
 	down(&dev->sem);
 
-	if (dev->parent && dev->parent->power.power_state.event) {
-		dev_err(dev, "PM: resume from %d, parent %s still %d\n",
-			dev->power.power_state.event,
-			dev->parent->bus_id,
-			dev->parent->power.power_state.event);
-	}
-
 	if (dev->bus && dev->bus->resume) {
 		dev_dbg(dev,"resuming\n");
 		error = dev->bus->resume(dev);

index a3ff394..26df9b2 100644
@@ -63,13 +63,6 @@ int suspend_device(struct device * dev, pm_message_t state)
 		dev_dbg(dev, "PM: suspend %d-->%d\n",
 			dev->power.power_state.event, state.event);
 	}
-	if (dev->parent && dev->parent->power.power_state.event) {
-		dev_err(dev,
-			"PM: suspend %d->%d, parent %s already %d\n",
-			dev->power.power_state.event, state.event,
-			dev->parent->bus_id,
-			dev->parent->power.power_state.event);
-	}
 
 	if (dev->class && dev->class->suspend) {
 		suspend_device_dbg(dev, state, "class ");

index cfe6f46..ae21755 100644
@@ -60,6 +60,9 @@ struct locomo {
 	unsigned int irq;
 	spinlock_t lock;
 	void __iomem *base;
+#ifdef CONFIG_PM
+	void *saved_state;
+#endif
 };
 
 struct locomo_dev_info {

@@ -565,7 +568,7 @@ static int locomo_suspend(struct platform_device *dev, pm_message_t state)
 	if (!save)
 		return -ENOMEM;
 
-	dev->dev.power.saved_state = (void *) save;
+	lchip->saved_state = save;
 
 	spin_lock_irqsave(&lchip->lock, flags);
 

@@ -605,8 +608,8 @@ static int locomo_resume(struct platform_device *dev)
 	struct locomo_save_data *save;
 	unsigned long r;
 	unsigned long flags;
-	
-	save = (struct locomo_save_data *) dev->dev.power.saved_state;
+
+	save = lchip->saved_state;
 	if (!save)
 		return 0;
 

@@ -628,6 +631,8 @@ static int locomo_resume(struct platform_device *dev)
 	locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
 
 	spin_unlock_irqrestore(&lchip->lock, flags);
+
+	lchip->saved_state = NULL;
 	kfree(save);
 
 	return 0;

index 798bbfc..eb06d0b 100644
@@ -51,6 +51,9 @@ struct sa1111 {
 	int		irq;
 	spinlock_t	lock;
 	void __iomem	*base;
+#ifdef CONFIG_PM
+	void		*saved_state;
+#endif
 };
 
 /*

@@ -822,7 +825,7 @@ static int sa1111_suspend(struct platform_device *dev, pm_message_t state)
 	save = kmalloc(sizeof(struct sa1111_save_data), GFP_KERNEL);
 	if (!save)
 		return -ENOMEM;
-	dev->dev.power.saved_state = save;
+	sachip->saved_state = save;
 
 	spin_lock_irqsave(&sachip->lock, flags);
 

@@ -878,7 +881,7 @@ static int sa1111_resume(struct platform_device *dev)
 	unsigned long flags, id;
 	void __iomem *base;
 
-	save = (struct sa1111_save_data *)dev->dev.power.saved_state;
+	save = sachip->saved_state;
 	if (!save)
 		return 0;
 

@@ -923,7 +926,7 @@ static int sa1111_resume(struct platform_device *dev)
 
 	spin_unlock_irqrestore(&sachip->lock, flags);
 
-	dev->dev.power.saved_state = NULL;
+	sachip->saved_state = NULL;
 	kfree(save);
 
 	return 0;

@@ -958,8 +961,8 @@ static int sa1111_remove(struct platform_device *pdev)
 		platform_set_drvdata(pdev, NULL);
 
 #ifdef CONFIG_PM
-		kfree(pdev->dev.power.saved_state);
-		pdev->dev.power.saved_state = NULL;
+		kfree(sachip->saved_state);
+		sachip->saved_state = NULL;
 #endif
 	}
 

index 4cbf946..3a0a1ee 100644
@@ -185,28 +185,21 @@ static int __devinit neponset_probe(struct platform_device *dev)
 /*
  * LDM power management.
  */
+static unsigned int neponset_saved_state;
+
 static int neponset_suspend(struct platform_device *dev, pm_message_t state)
 {
 	/*
 	 * Save state.
 	 */
-	if (!dev->dev.power.saved_state)
-		dev->dev.power.saved_state = kmalloc(sizeof(unsigned int), GFP_KERNEL);
-	if (!dev->dev.power.saved_state)
-		return -ENOMEM;
-
-	*(unsigned int *)dev->dev.power.saved_state = NCR_0;
+	neponset_saved_state = NCR_0;
 
 	return 0;
 }
 
 static int neponset_resume(struct platform_device *dev)
 {
-	if (dev->dev.power.saved_state) {
-		NCR_0 = *(unsigned int *)dev->dev.power.saved_state;
-		kfree(dev->dev.power.saved_state);
-		dev->dev.power.saved_state = NULL;
-	}
+	NCR_0 = neponset_saved_state;
 
 	return 0;
 }

index 7ff5aaf..f299e0d 100644
@@ -622,7 +622,8 @@ int bus_add_driver(struct device_driver *drv)
 	if (error)
 		goto out_put_bus;
 	drv->kobj.kset = &bus->drivers;
-	if ((error = kobject_register(&drv->kobj)))
+	error = kobject_register(&drv->kobj);
+	if (error)
 		goto out_put_bus;
 
 	if (drv->bus->drivers_autoprobe) {

@@ -772,7 +773,8 @@ static int bus_add_attrs(struct bus_type * bus)
 
 	if (bus->bus_attrs) {
 		for (i = 0; attr_name(bus->bus_attrs[i]); i++) {
-			if ((error = bus_create_file(bus,&bus->bus_attrs[i])))
+			error = bus_create_file(bus,&bus->bus_attrs[i]);
+			if (error)
 				goto Err;
 		}
 	}

index dd40d78..cff4fbf 100644
@@ -733,11 +733,14 @@ int device_add(struct device *dev)
 		}
 	}
 
-	if ((error = device_add_attrs(dev)))
+	error = device_add_attrs(dev);
+	if (error)
 		goto AttrsError;
-	if ((error = device_pm_add(dev)))
+	error = device_pm_add(dev);
+	if (error)
 		goto PMError;
-	if ((error = bus_add_device(dev)))
+	error = bus_add_device(dev);
+	if (error)
 		goto BusError;
 	kobject_uevent(&dev->kobj, KOBJ_ADD);
 	bus_attach_device(dev);

index 305117c..7b5a59c 100644
@@ -100,10 +100,11 @@ static int sub_alloc(struct idr *idp, void *ptr, int *starting_id)
 	int n, m, sh;
 	struct idr_layer *p, *new;
 	struct idr_layer *pa[MAX_LEVEL];
-	int l, id;
+	int l, id, oid;
 	long bm;
 
 	id = *starting_id;
+ restart:
 	p = idp->top;
 	l = idp->layers;
 	pa[l--] = NULL;

@@ -117,12 +118,23 @@ static int sub_alloc(struct idr *idp, void *ptr, int *starting_id)
 		if (m == IDR_SIZE) {
 			/* no space available go back to previous layer. */
 			l++;
+			oid = id;
 			id = (id | ((1 << (IDR_BITS * l)) - 1)) + 1;
+
+			/* if already at the top layer, we need to grow */
 			if (!(p = pa[l])) {
 				*starting_id = id;
 				return -2;
 			}
-			continue;
+
+			/* If we need to go up one layer, continue the
+			 * loop; otherwise, restart from the top.
+			 */
+			sh = IDR_BITS * (l + 1);
+			if (oid >> sh == id >> sh)
+				continue;
+			else
+				goto restart;
 		}
 		if (m != n) {
 			sh = IDR_BITS*l;

index 7b5a59c..30b33e2 100644
@@ -70,6 +70,26 @@ static void free_layer(struct idr *idp, struct idr_layer *p)
 	spin_unlock_irqrestore(&idp->lock, flags);
 }
 
+static void idr_mark_full(struct idr_layer **pa, int id)
+{
+	struct idr_layer *p = pa[0];
+	int l = 0;
+
+	__set_bit(id & IDR_MASK, &p->bitmap);
+	/*
+	 * If this layer is full mark the bit in the layer above to
+	 * show that this part of the radix tree is full.  This may
+	 * complete the layer above and require walking up the radix
+	 * tree.
+	 */
+	while (p->bitmap == IDR_FULL) {
+		if (!(p = pa[++l]))
+			break;
+		id = id >> IDR_BITS;
+		__set_bit((id & IDR_MASK), &p->bitmap);
+	}
+}
+
 /**
  * idr_pre_get - reserver resources for idr allocation
  * @idp:	idr handle

@@ -95,11 +115,10 @@ int idr_pre_get(struct idr *idp, gfp_t gfp_mask)
 }
 EXPORT_SYMBOL(idr_pre_get);
 
-static int sub_alloc(struct idr *idp, void *ptr, int *starting_id)
+static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa)
 {
 	int n, m, sh;
 	struct idr_layer *p, *new;
-	struct idr_layer *pa[MAX_LEVEL];
 	int l, id, oid;
 	long bm;
 

@@ -156,30 +175,13 @@ static int sub_alloc(struct idr *idp, void *ptr, int *starting_id)
 		pa[l--] = p;
 		p = p->ary[m];
 	}
-	/*
-	 * We have reached the leaf node, plant the
-	 * users pointer and return the raw id.
-	 */
-	p->ary[m] = (struct idr_layer *)ptr;
-	__set_bit(m, &p->bitmap);
-	p->count++;
-	/*
-	 * If this layer is full mark the bit in the layer above
-	 * to show that this part of the radix tree is full.
-	 * This may complete the layer above and require walking
-	 * up the radix tree.
-	 */
-	n = id;
-	while (p->bitmap == IDR_FULL) {
-		if (!(p = pa[++l]))
-			break;
-		n = n >> IDR_BITS;
-		__set_bit((n & IDR_MASK), &p->bitmap);
-	}
-	return(id);
+
+	pa[l] = p;
+	return id;
 }
 
-static int idr_get_new_above_int(struct idr *idp, void *ptr, int starting_id)
+static int idr_get_empty_slot(struct idr *idp, int starting_id,
+			      struct idr_layer **pa)
 {
 	struct idr_layer *p, *new;
 	int layers, v, id;

@@ -225,12 +227,31 @@ build_up:
 	}
 	idp->top = p;
 	idp->layers = layers;
-	v = sub_alloc(idp, ptr, &id);
+	v = sub_alloc(idp, &id, pa);
 	if (v == -2)
 		goto build_up;
 	return(v);
 }
 
+static int idr_get_new_above_int(struct idr *idp, void *ptr, int starting_id)
+{
+	struct idr_layer *pa[MAX_LEVEL];
+	int id;
+
+	id = idr_get_empty_slot(idp, starting_id, pa);
+	if (id >= 0) {
+		/*
+		 * Successfully found an empty slot.  Install the user
+		 * pointer and mark the slot full.
+		 */
+		pa[0]->ary[id & IDR_MASK] = (struct idr_layer *)ptr;
+		pa[0]->count++;
+		idr_mark_full(pa, id);
+	}
+
+	return id;
+}
+
 /**
  * idr_get_new_above - allocate new idr entry above or equal to a start id
  * @idp: idr handle

index 8268034..915572f 100644
@@ -83,4 +83,33 @@ void idr_remove(struct idr *idp, int id);
 void idr_destroy(struct idr *idp);
 void idr_init(struct idr *idp);
 
+
+/*
+ * IDA - IDR based id allocator, use when translation from id to
+ * pointer isn't necessary.
+ */
+#define IDA_CHUNK_SIZE		128	/* 128 bytes per chunk */
+#define IDA_BITMAP_LONGS	(128 / sizeof(long) - 1)
+#define IDA_BITMAP_BITS		(IDA_BITMAP_LONGS * sizeof(long) * 8)
+
+struct ida_bitmap {
+	long			nr_busy;
+	unsigned long		bitmap[IDA_BITMAP_LONGS];
+};
+
+struct ida {
+	struct idr		idr;
+	struct ida_bitmap	*free_bitmap;
+};
+
+#define IDA_INIT(name)		{ .idr = IDR_INIT(name), .free_bitmap = NULL, }
+#define DEFINE_IDA(name)	struct ida name = IDA_INIT(name)
+
+int ida_pre_get(struct ida *ida, gfp_t gfp_mask);
+int ida_get_new_above(struct ida *ida, int starting_id, int *p_id);
+int ida_get_new(struct ida *ida, int *p_id);
+void ida_remove(struct ida *ida, int id);
+void ida_destroy(struct ida *ida);
+void ida_init(struct ida *ida);
+
 #endif /* __IDR_H__ */

248 lines not on this page · raw message

index c4342a0..2544aae 100644
@@ -15,6 +15,18 @@
 DECLARE_RWSEM(sysfs_rename_sem);
 spinlock_t sysfs_lock = SPIN_LOCK_UNLOCKED;
 
+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 502c949..687d959 100644
@@ -18,6 +18,7 @@ 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 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);

@@ -99,18 +100,6 @@ static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
 	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 2544aae..f09626c 100644
@@ -9,12 +9,42 @@
 #include <linux/module.h>
 #include <linux/kobject.h>
 #include <linux/namei.h>
+#include <linux/idr.h>
 #include <asm/semaphore.h>
 #include "sysfs.h"
 
 DECLARE_RWSEM(sysfs_rename_sem);
 spinlock_t sysfs_lock = SPIN_LOCK_UNLOCKED;
 
+static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_IDA(sysfs_ino_ida);
+
+int sysfs_alloc_ino(ino_t *pino)
+{
+	int ino, rc;
+
+ retry:
+	spin_lock(&sysfs_ino_lock);
+	rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino);
+	spin_unlock(&sysfs_ino_lock);
+
+	if (rc == -EAGAIN) {
+		if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL))
+			goto retry;
+		rc = -ENOMEM;
+	}
+
+	*pino = ino;
+	return rc;
+}
+
+static void sysfs_free_ino(ino_t ino)
+{
+	spin_lock(&sysfs_ino_lock);
+	ida_remove(&sysfs_ino_ida, ino);
+	spin_unlock(&sysfs_ino_lock);
+}
+
 void release_sysfs_dirent(struct sysfs_dirent * sd)
 {
 	if (sd->s_type & SYSFS_KOBJ_LINK) {

@@ -24,6 +54,7 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 		kfree(sl);
 	}
 	kfree(sd->s_iattr);
+	sysfs_free_ino(sd->s_ino);
 	kmem_cache_free(sysfs_dir_cachep, sd);
 }
 

@@ -54,14 +85,6 @@ static struct dentry_operations sysfs_dentry_ops = {
 	.d_iput		= sysfs_d_iput,
 };
 
-static unsigned int sysfs_inode_counter;
-ino_t sysfs_get_inum(void)
-{
-	if (unlikely(sysfs_inode_counter < 3))
-		sysfs_inode_counter = 3;
-	return sysfs_inode_counter++;
-}
-
 /*
  * Allocates a new sysfs_dirent and links it to the parent sysfs_dirent
  */

@@ -73,7 +96,11 @@ static struct sysfs_dirent * __sysfs_new_dirent(void * element)
 	if (!sd)
 		return NULL;
 
-	sd->s_ino = sysfs_get_inum();
+	if (sysfs_alloc_ino(&sd->s_ino)) {
+		kmem_cache_free(sysfs_dir_cachep, sd);
+		return NULL;
+	}
+
 	atomic_set(&sd->s_count, 1);
 	atomic_set(&sd->s_event, 1);
 	INIT_LIST_HEAD(&sd->s_children);

index 687d959..f4fdbbf 100644
@@ -111,7 +111,7 @@ static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 
 static inline void sysfs_put(struct sysfs_dirent * sd)
 {
-	if (atomic_dec_and_test(&sd->s_count))
+	if (sd && atomic_dec_and_test(&sd->s_count))
 		release_sysfs_dirent(sd);
 }
 

index d3b9f5f..606267a 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)

@@ -51,15 +48,14 @@ 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;
 
-	pr_debug("offs = %lld, *off = %lld, count = %zd\n", offs, *off, count);
+	pr_debug("offs = %lld, *off = %lld, count = %d\n", offs, *off, count);
 
 	*off = offs + count;
 

@@ -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 f09626c..b4c4824 100644
@@ -207,40 +207,53 @@ 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 b4c4824..90bed5d 100644
@@ -452,8 +452,9 @@ void sysfs_remove_dir(struct kobject * kobj)
 int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
 		     const char *new_name)
 {
-	int error = 0;
+	int error;
 	struct dentry * new_dentry;
+	struct sysfs_dirent *sd, *parent_sd;
 
 	if (!new_parent)
 		return -EFAULT;

@@ -462,40 +463,48 @@ int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
 	mutex_lock(&new_parent->d_inode->i_mutex);
 
 	new_dentry = lookup_one_len(new_name, new_parent, strlen(new_name));
-	if (!IS_ERR(new_dentry)) {
-		/* By allowing two different directories with the
-		 * same d_parent we allow this routine to move
-		 * between different shadows of the same directory
-		 */
-		if (kobj->dentry->d_parent->d_inode != new_parent->d_inode)
-			return -EINVAL;
-		else if (new_dentry->d_parent->d_inode != new_parent->d_inode)
-			error = -EINVAL;
-		else if (new_dentry == kobj->dentry)
-			error = -EINVAL;
-		else if (!new_dentry->d_inode) {
-			error = kobject_set_name(kobj, "%s", new_name);
-			if (!error) {
-				struct sysfs_dirent *sd, *parent_sd;
-
-				d_add(new_dentry, NULL);
-				d_move(kobj->dentry, new_dentry);
-
-				sd = kobj->dentry->d_fsdata;
-				parent_sd = new_parent->d_fsdata;
-
-				list_del_init(&sd->s_sibling);
-				list_add(&sd->s_sibling, &parent_sd->s_children);
-			}
-			else
-				d_drop(new_dentry);
-		} else
-			error = -EEXIST;
-		dput(new_dentry);
+	if (IS_ERR(new_dentry)) {
+		error = PTR_ERR(new_dentry);
+		goto out_unlock;
 	}
+
+	/* By allowing two different directories with the same
+	 * d_parent we allow this routine to move between different
+	 * shadows of the same directory
+	 */
+	error = -EINVAL;
+	if (kobj->dentry->d_parent->d_inode != new_parent->d_inode ||
+	    new_dentry->d_parent->d_inode != new_parent->d_inode ||
+	    new_dentry == kobj->dentry)
+		goto out_dput;
+
+	error = -EEXIST;
+	if (new_dentry->d_inode)
+		goto out_dput;
+
+	error = kobject_set_name(kobj, "%s", new_name);
+	if (error)
+		goto out_drop;
+
+	d_add(new_dentry, NULL);
+	d_move(kobj->dentry, new_dentry);
+
+	sd = kobj->dentry->d_fsdata;
+	parent_sd = new_parent->d_fsdata;
+
+	list_del_init(&sd->s_sibling);
+	list_add(&sd->s_sibling, &parent_sd->s_children);
+
+	error = 0;
+	goto out_unlock;
+
+ out_drop:
+	d_drop(new_dentry);
+ out_dput:
+	dput(new_dentry);
+ out_unlock:
 	mutex_unlock(&new_parent->d_inode->i_mutex);
 	up_write(&sysfs_rename_sem);
-
 	return error;
 }
 

index 90bed5d..f16aa7e 100644
@@ -85,10 +85,7 @@ 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;
 

@@ -105,25 +102,25 @@ 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);
 }
 
 /*

@@ -151,39 +148,6 @@ 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;

@@ -227,10 +191,11 @@ 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)

@@ -245,7 +210,6 @@ 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:

@@ -557,13 +521,16 @@ 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)

@@ -736,9 +703,10 @@ 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 b502c71..fd4b6dc 100644
@@ -444,14 +444,25 @@ 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 f4fdbbf..f8f49cc 100644
@@ -20,8 +20,11 @@ extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
 
 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 f16aa7e..5d50e1d 100644
@@ -47,6 +47,11 @@ static void sysfs_free_ino(ino_t ino)
 
 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);

@@ -56,6 +61,10 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 	kfree(sd->s_iattr);
 	sysfs_free_ino(sd->s_ino);
 	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)

@@ -119,8 +128,10 @@ 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);
+	}
 }
 
 /*

@@ -571,7 +582,10 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 			i++;
 			/* fallthrough */
 		case 1:
-			ino = parent_ino(dentry);
+			if (parent_sd->s_parent)
+				ino = parent_sd->s_parent->s_ino;
+			else
+				ino = parent_sd->s_ino;
 			if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
 				break;
 			filp->f_pos++;

@@ -688,13 +702,13 @@ 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;

@@ -706,6 +720,8 @@ 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 00ab912..31c1fc6 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 f8f49cc..ce05d6f 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 5d50e1d..6e8d6f5 100644
@@ -54,10 +54,11 @@ 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);
 	sysfs_free_ino(sd->s_ino);
 	kmem_cache_free(sysfs_dir_cachep, sd);

@@ -94,29 +95,41 @@ 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)
 {
-	struct sysfs_dirent * sd;
+	char *dup_name = NULL;
+	struct sysfs_dirent *sd = NULL;
+
+	if (type & SYSFS_COPY_NAME) {
+		name = dup_name = kstrdup(name, GFP_KERNEL);
+		if (!name)
+			goto err_out;
+	}
 
 	sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL);
 	if (!sd)
-		return NULL;
+		goto err_out;
 
-	if (sysfs_alloc_ino(&sd->s_ino)) {
-		kmem_cache_free(sysfs_dir_cachep, sd);
-		return NULL;
-	}
+	if (sysfs_alloc_ino(&sd->s_ino))
+		goto err_out;
 
 	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;
 
 	return sd;
+
+ err_out:
+	kfree(dup_name);
+	kmem_cache_free(sysfs_dir_cachep, sd);
+	return NULL;
 }
 
 void sysfs_attach_dirent(struct sysfs_dirent *sd,

@@ -148,8 +161,7 @@ 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;

@@ -203,7 +215,7 @@ 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);

@@ -334,9 +346,7 @@ 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)

@@ -427,9 +437,11 @@ void sysfs_remove_dir(struct kobject * kobj)
 int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
 		     const char *new_name)
 {
+	struct sysfs_dirent *sd = kobj->dentry->d_fsdata;
+	struct sysfs_dirent *parent_sd = new_parent->d_fsdata;
+	struct dentry *new_dentry;
+	char *dup_name;
 	int error;
-	struct dentry * new_dentry;
-	struct sysfs_dirent *sd, *parent_sd;
 
 	if (!new_parent)
 		return -EFAULT;

@@ -457,22 +469,31 @@ int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
 	if (new_dentry->d_inode)
 		goto out_dput;
 
+	/* rename kobject and sysfs_dirent */
+	error = -ENOMEM;
+	new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
+	if (!new_name)
+		goto out_drop;
+
 	error = kobject_set_name(kobj, "%s", new_name);
 	if (error)
-		goto out_drop;
+		goto out_free;
 
+	kfree(sd->s_name);
+	sd->s_name = new_name;
+
+	/* move under the new parent */
 	d_add(new_dentry, NULL);
 	d_move(kobj->dentry, new_dentry);
 
-	sd = kobj->dentry->d_fsdata;
-	parent_sd = new_parent->d_fsdata;
-
 	list_del_init(&sd->s_sibling);
 	list_add(&sd->s_sibling, &parent_sd->s_children);
 
 	error = 0;
 	goto out_unlock;
 
+ out_free:
+	kfree(dup_name);
  out_drop:
 	d_drop(new_dentry);
  out_dput:

@@ -535,7 +556,7 @@ 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);

@@ -605,7 +626,7 @@ 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 = next->s_ino;
 

@@ -717,7 +738,7 @@ 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 fd4b6dc..8240b16 100644
@@ -454,7 +454,7 @@ 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 5266eec..5c605b0 100644
@@ -191,37 +191,6 @@ 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;

@@ -305,7 +274,7 @@ 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 ce05d6f..d34b008 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 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);
 

@@ -48,7 +48,6 @@ 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 7d5d1ec..2f86b08 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 606267a..67a0d50 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 6e8d6f5..0791226 100644
@@ -52,11 +52,8 @@ 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);

@@ -95,8 +92,7 @@ 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 = NULL;

@@ -120,7 +116,6 @@ 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;
 

@@ -160,7 +155,7 @@ 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

@@ -215,9 +210,10 @@ 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);

@@ -290,10 +286,10 @@ 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;
         }
 

@@ -404,7 +400,7 @@ 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);

@@ -556,7 +552,7 @@ 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);

@@ -623,7 +619,7 @@ 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;

@@ -671,7 +667,7 @@ 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;
 			}

@@ -738,9 +734,10 @@ 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 8240b16..04f6b0e 100644
@@ -88,7 +88,6 @@ 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;

@@ -100,7 +99,7 @@ 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;

@@ -199,11 +198,11 @@ 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);
 }
 
 

@@ -248,7 +247,8 @@ 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;

@@ -341,15 +341,15 @@ 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)

@@ -454,11 +454,12 @@ 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 5c605b0..617d10c 100644
@@ -272,7 +272,7 @@ 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 31c1fc6..8f6d8b1 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,
 	.s_ino		= 1,

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;
 }
 
 /**

89 lines not on this page · raw message

index 0791226..e9fddcc 100644
@@ -15,6 +15,7 @@
 
 DECLARE_RWSEM(sysfs_rename_sem);
 spinlock_t sysfs_lock = SPIN_LOCK_UNLOCKED;
+spinlock_t kobj_sysfs_assoc_lock = SPIN_LOCK_UNLOCKED;
 
 static spinlock_t sysfs_ino_lock = SPIN_LOCK_UNLOCKED;
 static DEFINE_IDA(sysfs_ino_ida);

@@ -426,8 +427,13 @@ 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 39ab048..718e2e1 100644
@@ -62,6 +62,7 @@ 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 sysfs_lock;
+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 e9fddcc..2a94dc3 100644
@@ -54,7 +54,7 @@ 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 718e2e1..6071766 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 {

@@ -100,10 +100,11 @@ static inline 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);
 

index 67a0d50..5dc47fe 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 = %d\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)