From: Hans Verkuil <hverkuil@xs4all.nl>
Date: Fri, 26 Nov 2010 09:54:53 +0000 (-0300)
Subject: [media] v4l2-dev: fix race condition
X-Git-Tag: v2.6.37-rc7~22^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca9afe6f87b569cdf8e797395381f18ae23a2905;p=pandora-kernel.git

[media] v4l2-dev: fix race condition

The unregister function had a race condition with the v4l2_open
function. Ensure that both functions test and clear the REGISTER
flag from within a critical section.

Thanks to Laurent Pinchart for finding this race.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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