Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 35a6027f authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Linus Torvalds
Browse files

[PATCH] new bd_mutex lockdep annotation 



Use the gendisk partition number to set a lock class.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Neil Brown <neilb@cse.unsw.edu.au>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Cc: Jason Baron <jbaron@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 2e7b651d

fs/block_dev.c

+9 −0
Original line number Diff line number Diff line
@@ -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;

}