linux-kernel - Re: [PATCH] Hibernation: Fix lockdep report (v2)

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Date:	Wed, 14 Nov 2007 22:54:33 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Pavel Machek <pavel@....cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Berg <johannes@...solutions.net>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] Hibernation: Fix lockdep report (v2)


On Wed, 2007-11-14 at 22:42 +0000, Pavel Machek wrote:
> On Wed 2007-11-14 22:25:57, Rafael J. Wysocki wrote:
> > [Andrew, please consider this as 2.6.24 material, thanks.]
> > ---
> > From: Johannes Berg <johannes@...solutions.net>
> > 
> > Lockdep reports a circular locking dependency in the hibernate code
> > because
> >  - during system boot hibernate code (from an initcall) locks pm_mutex
> >    and then a sysfs buffer mutex via name_to_dev_t
> >  - during regular operation hibernate code locks pm_mutex under a
> >    sysfs buffer mutex because it's called from sysfs methods.
> > 
> > The deadlock can never happen because during initcall invocation nothing
> > can write to sysfs yet. This removes the lockdep report by marking the
> > initcall locking as being in a different class.
> > 
> > Signed-off-by: Johannes Berg <johannes@...solutions.net>
> > Cc: Alan Stern <stern@...land.harvard.edu>
> > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>

I guess mine got lost too :-)

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

> > Cc: Pavel Machek <pavel@....cz>
> 
> ACK...
> 

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