diff options
| author | Sean Paul <seanpaul@chromium.org> | 2012-03-23 08:52:58 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-04-13 08:33:47 -0700 |
| commit | c3140c5a90be5cc54a68099de13e80a034b6196d (patch) | |
| tree | 826924f7d413b1bc9c341026c2407c1451704a68 | |
| parent | b1db3350081817e91ab5502ca4e8915e4c32d38b (diff) | |
drm/i915: Add lock on drm_helper_resume_force_mode
commit 927a2f119e8235238a2fc64871051b16c9bdae75 upstream.
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>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index d04597dfa52c..e52b7057d111 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -508,7 +508,9 @@ 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); |