1 files changed, 2 insertions, 1 deletions

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 47809ac94bc3..d54de24bf371 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -528,7 +528,8 @@ struct drm_mode_group {
  *
  */
 struct drm_mode_config {
-        struct mutex mutex; /* protects configuration and IDR */
+        struct mutex mutex; /* protects configuration (mode lists etc.) */
+        struct mutex idr_mutex; /* for IDR management */
         struct idr crtc_idr; /* use this idr for all IDs, fb, crtc, connector, modes - just makes life easier */
         /* this is limited to one for now */
         int num_fb;