From: NeilBrown The extra call to get_gendisk is not good. It causes a ->probe and possible module load before it is really appropriate to do this. Cc: Ingo Molnar Acked-by: Peter Zijlstra Signed-off-by: Neil Brown Signed-off-by: Andrew Morton --- fs/block_dev.c | 9 --------- 1 files changed, 9 deletions(-) diff -puN fs/block_dev.c~remove-lock_key-approach-to-managing-nested-bd_mutex-locks fs/block_dev.c --- a/fs/block_dev.c~remove-lock_key-approach-to-managing-nested-bd_mutex-locks +++ a/fs/block_dev.c @@ -355,14 +355,10 @@ static int bdev_set(struct inode *inode, 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); @@ -388,11 +384,6 @@ 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; } _