From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 27 Nov 2009 13:06:56 +0000 (+0000)
Subject: drm/i915: Avoid NULL dereference with component_only tv_modes
X-Git-Tag: v2.6.33-rc1~323^2~5^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d271817baecbccb47da0d9f28c285a0dae8a06b7;p=pandora-kernel.git

drm/i915: Avoid NULL dereference with component_only tv_modes

In commit d2d9f2324, the guard for a valid video mode was removed. This
caused the regression:

  kernel crash during kms graphic boot on Intel GM4500 platform
  https://bugzilla.redhat.com/show_bug.cgi?id=540218

This patches changes the logic slightly not to rely on a coupled
variable, but to just check whether the video_modes is valid before
dereferencing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Zhenyu Wang <zhenyu.z.wang@intel.com>
[ickle: Actually reference the correct bug report]
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
---

Reading git-diff-tree failed