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drm/i915: Add lock on drm_helper_resume_force_mode 

i915_drm_thaw was not locking the mode_config lock when calling
drm_helper_resume_force_mode. When there were multiple wake sources,
this caused FDI training failure on SNB which in turn corrupted the
display.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Sean Paul 2012-03-23 08:52:58 -04:00 committed by Daniel Vetter
parent e02f14cd48
commit 927a2f119e
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_drv.c
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@ -538,7 +538,9 @@ static int i915_drm_thaw(struct drm_device *dev)
drm_irq_install(dev);
/* Resume the modeset for every activated CRTC */
mutex_lock(&dev->mode_config.mutex);
drm_helper_resume_force_mode(dev);
mutex_unlock(&dev->mode_config.mutex);
if (IS_IRONLAKE_M(dev))
ironlake_enable_rc6(dev);