linux-kernel - [ 37/78] drm/i915: Add lock on drm_helper_resume_force

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Message-Id: <20120411231024.560436759@linuxfoundation.org>
Date:	Wed, 11 Apr 2012 16:10:55 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Sean Paul <seanpaul@...omium.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [ 37/78] drm/i915: Add lock on drm_helper_resume_force_mode

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sean Paul <seanpaul@...omium.org>

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@...omium.org>
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/i915_drv.c |    2 ++
 1 file changed, 2 insertions(+)

--- 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_devi
 		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);


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