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| author | Sean Paul <seanpaul@chromium.org> | 2012-03-23 08:52:58 -0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-04-03 10:37:37 +0200 |
| commit | 927a2f119e8235238a2fc64871051b16c9bdae75 (patch) | |
| tree | 982fd48fc0a39dd5ce0e073b3475283219bd11a7 | |
| parent | e02f14cd48a5da0ebaecf88c93dbd54a81e0dead (diff) | |
| download | linux-stable-927a2f119e8235238a2fc64871051b16c9bdae75.tar.gz linux-stable-927a2f119e8235238a2fc64871051b16c9bdae75.tar.bz2 linux-stable-927a2f119e8235238a2fc64871051b16c9bdae75.zip | |
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>
| -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 19d55bc54873..dfa55e7478fb 100644 --- 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); |