From 7c063c725987406d743cc7de7625ff224fab75de Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Tue, 26 Nov 2013 09:13:41 -0800
Subject: drm/i915: take mode config lock around crtc disable at suspend

This is just a theoretical issue, but we need to do this to prevent the
WARN in pipe_from_connector at suspend time.

This regression has been introduce in

commit 7bd688cd66db93f6430f6e2b3145ee5686daa315
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Fri Nov 8 16:48:56 2013 +0200

    drm/i915: handle backlight through chip specific functions

https://bugs.freedesktop.org/show_bug.cgi?id=71978
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.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 989be12..2e367a1 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -534,8 +534,10 @@ static int i915_drm_freeze(struct drm_device *dev)
 		 * Disable CRTCs directly since we want to preserve sw state
 		 * for _thaw.
 		 */
+		mutex_lock(&dev->mode_config.mutex);
 		list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 			dev_priv->display.crtc_disable(crtc);
+		mutex_unlock(&dev->mode_config.mutex);
 
 		intel_modeset_suspend_hw(dev);
 	}
-- 
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