From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Wed, 24 Nov 2010 20:57:14 +0000 (-0800)
Subject: backlight: grab ops_lock before testing bd->ops
X-Git-Tag: v2.6.37-rc4~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1d73578e053b981c3611e5a211534290d24a5eb;p=pandora-kernel.git

backlight: grab ops_lock before testing bd->ops

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.

Fixes a problem added by c835ee7f4154992e6 ("backlight: Add suspend/resume
support to the backlight core") in Jan 2009.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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