drm/i915: Avoid NULL dereference with component_only tv_modes

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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>

...

This commit is contained in:

Chris Wilson 2009-11-27 13:06:56 +00:00 • committed by Eric Anholt

parent 9bedb9743f

commit d271817bae

1 changed files with 4 additions and 7 deletions

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drivers/gpu/drm/i915/intel_tv.c

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