linux-kernel - Re: 2.6.33-rc3 -- INFO: possible recursive locking -- (s_active){++++.+}, at: [<c10d2941>] sysfs_hash_and

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Date:	Tue, 12 Jan 2010 09:31:15 +0900
From:	Tejun Heo <tj@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Miles Lane <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: 2.6.33-rc3 -- INFO: possible recursive locking --  (s_active){++++.+},
 at: [<c10d2941>] sysfs_hash_and_remove+0x3d/0x4f

On 01/11/2010 11:26 AM, Eric W. Biederman wrote:
> From: Eric W. Biederman <ebiederm@...ssion.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@...ssion.com>

Acked-by: Tejun Heo <tj@...nel.org>

-- 
tejun
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