1 files changed, 4 insertions, 1 deletions

diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 7a592d7e398b..15e7f007380f 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -142,8 +142,11 @@ drm_gem_object_reference(struct drm_gem_object *obj)
 static inline void
 drm_gem_object_unreference(struct drm_gem_object *obj)
 {
-        if (obj != NULL)
+        if (obj != NULL) {
+                WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
+
                 kref_put(&obj->refcount, drm_gem_object_free);
+        }
 }
 
 static inline void