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 989be12cdd6e..2e367a1c6a64 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);
         }