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>

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 19d55bc..dfa55e7 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -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);