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-rw-r--r--fs/block_dev.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 36c38f48a4e..528cf053ce9 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -355,10 +355,14 @@ static int bdev_set(struct inode *inode, void *data)
static LIST_HEAD(all_bdevs);
+static struct lock_class_key bdev_part_lock_key;
+
struct block_device *bdget(dev_t dev)
{
struct block_device *bdev;
struct inode *inode;
+ struct gendisk *disk;
+ int part = 0;
inode = iget5_locked(bd_mnt->mnt_sb, hash(dev),
bdev_test, bdev_set, &dev);
@@ -384,6 +388,11 @@ struct block_device *bdget(dev_t dev)
list_add(&bdev->bd_list, &all_bdevs);
spin_unlock(&bdev_lock);
unlock_new_inode(inode);
+ mutex_init(&bdev->bd_mutex);
+ disk = get_gendisk(dev, &part);
+ if (part)
+ lockdep_set_class(&bdev->bd_mutex, &bdev_part_lock_key);
+ put_disk(disk);
}
return bdev;
}