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drm/i915: take mode config lock around crtc disable at suspend

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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 7bd688cd66
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>
This commit is contained in:
Jesse Barnes 2013-11-26 09:13:41 -08:00 committed by Daniel Vetter
parent c51e9701c4
commit 7c063c7259
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_drv.c
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@ -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);
}