mtd: ubi: allow UBI volumes to provide NVMEM

index 437c5b83ffe51..69fa6fecb8494 100644
@@ -456,7 +456,7 @@ static void ubiblock_cleanup(struct ubiblock *dev)
 	idr_remove(&ubiblock_minor_idr, dev->gd->first_minor);
 }
 
-int ubiblock_remove(struct ubi_volume_info *vi)
+int ubiblock_remove(struct ubi_volume_info *vi, bool force)
 {
 	struct ubiblock *dev;
 	int ret;

@@ -470,7 +470,7 @@ int ubiblock_remove(struct ubi_volume_info *vi)
 
 	/* Found a device, let's lock it so we can check if it's busy */
 	mutex_lock(&dev->dev_mutex);
-	if (dev->refcnt > 0) {
+	if (dev->refcnt > 0 && !force) {
 		ret = -EBUSY;
 		goto out_unlock_dev;
 	}

@@ -545,7 +545,7 @@ static int ubiblock_notify(struct notifier_block *nb,
 		 */
 		break;
 	case UBI_VOLUME_REMOVED:
-		ubiblock_remove(&nt->vi);
+		ubiblock_remove(&nt->vi, true);
 		break;
 	case UBI_VOLUME_RESIZED:
 		ubiblock_resize(&nt->vi);

index f43430b9c1e65..bb55e863dd296 100644
@@ -572,7 +572,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
 		struct ubi_volume_info vi;
 
 		ubi_get_volume_info(desc, &vi);
-		err = ubiblock_remove(&vi);
+		err = ubiblock_remove(&vi, false);
 		break;
 	}
 

index c8f1bd4fa1008..44c0eeaf1e1b0 100644
@@ -979,7 +979,7 @@ static inline void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) {}
 int ubiblock_init(void);
 void ubiblock_exit(void);
 int ubiblock_create(struct ubi_volume_info *vi);
-int ubiblock_remove(struct ubi_volume_info *vi);
+int ubiblock_remove(struct ubi_volume_info *vi, bool force);
 #else
 static inline int ubiblock_init(void) { return 0; }
 static inline void ubiblock_exit(void) {}

@@ -987,7 +987,7 @@ static inline int ubiblock_create(struct ubi_volume_info *vi)
 {
 	return -ENOSYS;
 }
-static inline int ubiblock_remove(struct ubi_volume_info *vi)
+static inline int ubiblock_remove(struct ubi_volume_info *vi, bool force)
 {
 	return -ENOSYS;
 }

index e0618bbde3613..99b5f502c9dbc 100644
@@ -470,7 +470,7 @@ int ubiblock_remove(struct ubi_volume_info *vi, bool force)
 	}
 
 	/* Found a device, let's lock it so we can check if it's busy */
-	mutex_lock(&dev->dev_mutex);
+	mutex_lock_nested(&dev->dev_mutex, SINGLE_DEPTH_NESTING);
 	if (dev->refcnt > 0 && !force) {
 		ret = -EBUSY;
 		goto out_unlock_dev;

230 lines not on this page · raw message

index bb55e863dd296..0ba6aa6a2e11d 100644
@@ -1065,7 +1065,7 @@ static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
 		}
 
 		mutex_lock(&ubi_devices_mutex);
-		err = ubi_detach_mtd_dev(ubi_num, 0);
+		err = ubi_detach_mtd_dev(ubi_num, 0, false);
 		mutex_unlock(&ubi_devices_mutex);
 		break;
 	}

index 44c0eeaf1e1b0..54093858f3385 100644
@@ -939,7 +939,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
 int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
 		       int vid_hdr_offset, int max_beb_per1024,
 		       bool disable_fm);
-int ubi_detach_mtd_dev(int ubi_num, int anyway);
+int ubi_detach_mtd_dev(int ubi_num, int anyway, bool have_lock);
 struct ubi_device *ubi_get_device(int ubi_num);
 void ubi_put_device(struct ubi_device *ubi);
 struct ubi_device *ubi_get_by_major(int major);

index 99b5f502c9dbc..1d5148371991b 100644
@@ -533,6 +533,29 @@ static int ubiblock_resize(struct ubi_volume_info *vi)
 	return 0;
 }
 
+static int ubiblock_shutdown(struct ubi_volume_info *vi)
+{
+	struct ubiblock *dev;
+	struct gendisk *disk;
+	int ret = 0;
+
+	mutex_lock(&devices_mutex);
+	dev = find_dev_nolock(vi->ubi_num, vi->vol_id);
+	if (!dev) {
+		ret = -ENODEV;
+		goto out_unlock;
+	}
+	disk = dev->gd;
+
+out_unlock:
+	mutex_unlock(&devices_mutex);
+
+	if (!ret)
+		blk_mark_disk_dead(disk);
+
+	return ret;
+};
+
 static bool
 match_volume_desc(struct ubi_volume_info *vi, const char *name, int ubi_num, int vol_id)
 {

@@ -624,6 +647,9 @@ static int ubiblock_notify(struct notifier_block *nb,
 	case UBI_VOLUME_REMOVED:
 		ubiblock_remove(&nt->vi, true);
 		break;
+	case UBI_VOLUME_SHUTDOWN:
+		ubiblock_shutdown(&nt->vi);
+		break;
 	case UBI_VOLUME_RESIZED:
 		ubiblock_resize(&nt->vi);
 		break;

index c153373c13dab..ccee4a28ffe97 100644
@@ -1088,7 +1088,6 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway, bool have_lock)
 		return -EINVAL;
 
 	spin_lock(&ubi_devices_lock);
-	put_device(&ubi->dev);
 	ubi->ref_count -= 1;
 	if (ubi->ref_count) {
 		if (!anyway) {

@@ -1099,6 +1098,12 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway, bool have_lock)
 		ubi_err(ubi, "%s reference count %d, destroy anyway",
 			ubi->ubi_name, ubi->ref_count);
 	}
+	spin_unlock(&ubi_devices_lock);
+
+	ubi_notify_all(ubi, UBI_VOLUME_SHUTDOWN, NULL);
+
+	spin_lock(&ubi_devices_lock);
+	put_device(&ubi->dev);
 	ubi_devices[ubi_num] = NULL;
 	spin_unlock(&ubi_devices_lock);
 

index 2c867d16f89f7..eed4b57c61bda 100644
@@ -352,6 +352,11 @@ int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
 		err = -EBUSY;
 		goto out_unlock;
 	}
+	spin_unlock(&ubi->volumes_lock);
+
+	ubi_volume_notify(ubi, vol, UBI_VOLUME_SHUTDOWN);
+
+	spin_lock(&ubi->volumes_lock);
 	ubi->volumes[vol_id] = NULL;
 	spin_unlock(&ubi->volumes_lock);
 

index a529347fd75b2..562f92504f2b7 100644
@@ -192,6 +192,7 @@ struct ubi_device_info {
  *			or a volume was removed)
  * @UBI_VOLUME_RESIZED: a volume has been re-sized
  * @UBI_VOLUME_RENAMED: a volume has been re-named
+ * @UBI_VOLUME_SHUTDOWN: a volume is going to removed, shutdown users
  * @UBI_VOLUME_UPDATED: data has been written to a volume
  *
  * These constants define which type of event has happened when a volume

@@ -202,6 +203,7 @@ enum {
 	UBI_VOLUME_REMOVED,
 	UBI_VOLUME_RESIZED,
 	UBI_VOLUME_RENAMED,
+	UBI_VOLUME_SHUTDOWN,
 	UBI_VOLUME_UPDATED,
 };
 

index eed4b57c61bda..3b997256cfba7 100644
@@ -124,6 +124,35 @@ static void vol_release(struct device *dev)
 	kfree(vol);
 }
 
+static struct fwnode_handle *find_volume_fwnode(struct ubi_volume *vol)
+{
+	struct fwnode_handle *fw_vols, *fw_vol;
+	const char *volname;
+	u32 reg;
+
+	fw_vols = device_get_named_child_node(vol->dev.parent->parent, "volumes");
+	if (!fw_vols)
+		return NULL;
+
+	fwnode_for_each_child_node(fw_vols, fw_vol) {
+		if (!fwnode_property_read_string(fw_vol, "volname", &volname) &&
+		    strncmp(volname, vol->name, vol->name_len))
+			continue;
+
+		/*
+		 * volume id (reg) in device tree greater than UBI_MAX_VOLUMES
+		 * can be used to match by volname only
+		 */
+		if (!fwnode_property_read_u32(fw_vol, "reg", &reg) &&
+		    reg < UBI_MAX_VOLUMES && vol->vol_id != reg)
+			continue;
+
+		return fw_vol;
+	}
+
+	return NULL;
+}
+
 /**
  * ubi_create_volume - create volume.
  * @ubi: UBI device description object

@@ -223,6 +252,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
 	vol->name_len  = req->name_len;
 	memcpy(vol->name, req->name, vol->name_len);
 	vol->ubi = ubi;
+	device_set_node(&vol->dev, find_volume_fwnode(vol));
 
 	/*
 	 * Finish all pending erases because there may be some LEBs belonging

@@ -597,6 +627,7 @@ int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
 	vol->dev.class = &ubi_class;
 	vol->dev.groups = volume_dev_groups;
 	dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
+	device_set_node(&vol->dev, find_volume_fwnode(vol));
 	err = device_register(&vol->dev);
 	if (err) {
 		cdev_del(&vol->cdev);

189 lines not on this page · raw message