From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 6 Mar 2009 23:27:52 +0000 (+0000)
Subject: drm/i915: Check for dev->primary->master before dereference.
X-Git-Tag: v2.6.30-rc1~646^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=98787c057fdefdce6230ff46f2c1105835005a4c;p=pandora-kernel.git

drm/i915: Check for dev->primary->master before dereference.

I've hit the occasional oops inside i915_wait_ring() with an indication of
a NULL derefence of dev->primary->master.  Adding a NULL check is
consistent with the other potential users of dev->primary->master.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
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