[PATCH] device-mapper: let freeze_bdev return error

 */

static int __lock_fs(struct mapped_device *md)

{

	int error = -ENOMEM;

	if (test_and_set_bit(DMF_FS_LOCKED, &md->flags))

		return 0;

	md->frozen_bdev = bdget_disk(md->disk, 0);

	if (!md->frozen_bdev) {

		DMWARN("bdget failed in __lock_fs");

		return -ENOMEM;

		goto out;

	}

	WARN_ON(md->frozen_sb);

	md->frozen_sb = freeze_bdev(md->frozen_bdev);

	if (IS_ERR(md->frozen_sb)) {

		error = PTR_ERR(md->frozen_sb);

		goto out_bdput;

	}

	/* don't bdput right now, we don't want the bdev

	 * to go away while it is locked.  We'll bdput

	 * in __unlock_fs

	 */

	return 0;

out_bdput:

	bdput(md->frozen_bdev);

	md->frozen_sb = NULL;

	md->frozen_bdev = NULL;

out:

	clear_bit(DMF_FS_LOCKED, &md->flags);

	return error;

}

static void __unlock_fs(struct mapped_device *md)