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To: Tejun Heo <tj@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
       =?utf-8?Q?Am=C3=A9rico?= Wang <xiyou.wangcong@gmail.com>,
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       Arjan van de Ven <arjan@infradead.org>,
       Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>
Subject: Re: 2.6.33-rc3 -- INFO: possible recursive locking --  (s_active){++++.+}, at: [<c10d2941>] sysfs_hash_and_remove+0x3d/0x4f
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	<m13a2dho1o.fsf@fess.ebiederm.org> <201001101935.31882.rjw@sisk.pl>
	<m1wrzpbcmi.fsf@fess.ebiederm.org> <4B4BC2D3.7070003@kernel.org>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: Mon, 11 Jan 2010 16:32:31 -0800
In-Reply-To: <4B4BC2D3.7070003@kernel.org> (Tejun Heo's message of "Tue\, 12 Jan 2010 09\:31\:15 +0900")
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Tejun Heo <tj@kernel.org> writes:

> On 01/11/2010 11:26 AM, Eric W. Biederman wrote:
>> From: Eric W. Biederman <ebiederm@xmission.com>
>> Date: Sun, 10 Jan 2010 18:13:35 -0800
>> Subject: [PATCH] sysfs: Add support for lockdep subclasses to s_active
>> 
>> We have apparently valid cases where the code for a sysfs attribute
>> removes other sysfs attributes.  Without support for subclasses
>> lockdep flags a possible recursive lock problem as it figures
>> the first sysfs attribute could be attempting to remove itself.
>> 
>> By adding support for sysfs subclasses we can teach lockdep to
>> distinguish between different types of sysfs attributes and not
>> get confused.
>> 
>> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
>
> Acked-by: Tejun Heo <tj@kernel.org>

Now if I can just get a Tested-by  this patch will be all set ;)

Eric

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