linux-kernel - Re: [PATCH] block_dev.c mutex_lock

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Date:	Wed, 23 Aug 2006 13:51:57 -0400 (EDT)
From:	Jason Baron <jbaron@...hat.com>
To:	Andrew Morton <akpm@...l.org>
cc:	neilb@...e.de, arjan@...radead.org, mingo@...hat.com,
	axboe@...e.de, a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block_dev.c mutex_lock_nested() fix


On Wed, 23 Aug 2006, Andrew Morton wrote:

> On Wed, 23 Aug 2006 11:09:35 -0400 (EDT)
> Jason Baron <jbaron@...hat.com> wrote:
> 
> > 
> > Hi,
> > 
> > In the case below we are locking the whole disk not a partition. This 
> > change simply brings the code in line with the piece above where when we 
> > are the 'first' opener, and we are a partition.
> > 
> > thanks,
> > 
> > -Jason
> > 
> > Signed-off-by: Jason Baron <jbaron@...hat.com>
> > 
> > --- linux-2.6/fs/block_dev.c.bak
> > +++ linux-2.6/fs/block_dev.c
> > @@ -966,7 +966,7 @@ do_open(struct block_device *bdev, struc
> >  				rescan_partitions(bdev->bd_disk, bdev);
> >  		} else {
> >  			mutex_lock_nested(&bdev->bd_contains->bd_mutex,
> > -					  BD_MUTEX_PARTITION);
> > +					  BD_MUTEX_WHOLE);
> >  			bdev->bd_contains->bd_part_count++;
> >  			mutex_unlock(&bdev->bd_contains->bd_mutex);
> >  		}
> 
> This was allegedly (re-re-re-re-)fixed in 2.6.18-rc4-mm2. 
> lockdep-fix-blkdev_open-warning.patch and
> lockdep-fix-blkdev_open-warning-fix.patch.
> 
> Is this patch needed in that kernel?
> 

yes. Those patches address a similar type of issue, but not this specific 
one. 


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