linux-kernel - [PATCH 001 of 4] Remove lock_key approach to managing nested bd

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Date:	Wed, 11 Oct 2006 16:09:08 +1000
From:	NeilBrown <neilb@...e.de>
To:	Andrew Morton <akpm@...l.org>
Cc:	Al Viro <viro@....linux.org.uk>
Subject: [PATCH 001 of 4] Remove lock_key approach to managing nested bd_mutex locks.


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 <mingo@...e.hu>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Neil Brown <neilb@...e.de>

### Diffstat output
 ./fs/block_dev.c |    9 ---------
 1 file changed, 9 deletions(-)

diff .prev/fs/block_dev.c ./fs/block_dev.c
--- .prev/fs/block_dev.c	2006-10-11 15:37:05.000000000 +1000
+++ ./fs/block_dev.c	2006-10-11 15:37:10.000000000 +1000
@@ -357,14 +357,10 @@ 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);
@@ -390,11 +386,6 @@ 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;
 }
-
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