--- ichsmb.c
+++ ichsmb.c
@@ -683,10 +683,11 @@ ichsmb_detach(device_t dev)
 	error = bus_generic_detach(dev);
 	if (error)
 		return (error);
-	device_delete_child(dev, sc->smb);
+	error = device_delete_child(dev, sc->smb);
+	if (error)
+		return (error);
 	ichsmb_release_resources(sc);
 	lockuninit(&sc->mutex);
 
 	return 0;
 }