linux-kernel - Re: [stable] [PATCH] backlight: grab ops

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Message-ID: <20101123085635.GH4693@pengutronix.de>
Date:	Tue, 23 Nov 2010 09:56:35 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Greg KH <greg@...ah.com>
Cc:	Richard Purdie <rpurdie@...ux.intel.com>,
	akpm <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de, stable@...nel.org
Subject: Re: [stable] [PATCH] backlight: grab ops_lock before testing
	bd->ops

Hi Greg,

On Mon, Nov 22, 2010 at 09:53:32AM -0800, Greg KH wrote:
> On Mon, Nov 22, 2010 at 11:05:32AM +0100, Uwe Kleine-König wrote:
> > Hello,
> > 
> > On Mon, Nov 22, 2010 at 09:59:07AM +0000, Richard Purdie wrote:
> > > On Mon, 2010-11-22 at 10:43 +0100, Uwe Kleine-König wrote:
> > > > According to the comment describing ops_lock in the definition of
> > > > struct backlight_device and when comparing with other functions in
> > > > backlight.c the mutex must be hold when checking ops to be non-NULL.
> > > > 
> > > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > > 
> > > Acked-by: Richard Purdie <rpurdie@...ux.intel.com>
> > The problem was introduced by c835ee7f4154992e6cf0674d7ee136f5d36247a4
> > (that is in 2.6.29-rc1).  Is this relevant for stable?
> 
> Yes.
> 
> What is the git commit id of the fix in Linus's tree?
I'll let you know when it hits his tree.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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