diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 8b8f71c3ccff..9a658decad2a 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -600,8 +600,10 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
 	if (!bridge->container)
 		DRM_WARN("DRM bridge corrupted or not allocated by devm_drm_bridge_alloc()\n");
 
-	if (list_empty(&bridge->list))
-		DRM_WARN("Missing drm_bridge_add() before attach\n");
+	scoped_guard(mutex, &bridge_lock) {
+		if (list_empty(&bridge->list))
+			DRM_WARN("Missing drm_bridge_add() before attach\n");
+	}
 
 	drm_bridge_get(bridge);