Index: usb-devel/drivers/usb/gadget/udc/dummy_hcd.c
===================================================================
--- usb-devel.orig/drivers/usb/gadget/udc/dummy_hcd.c
+++ usb-devel/drivers/usb/gadget/udc/dummy_hcd.c
@@ -465,7 +465,9 @@ static void set_link_state(struct dummy_
 			stop_activity(dum);
 			++dum->callback_usage;
 			spin_unlock(&dum->lock);
-			if (reset)
+			if (!dum->driver)
+				dev_err(dummy_dev(dum_hcd), "**** NO DRIVER!\n");
+			else if (reset)
 				usb_gadget_udc_reset(&dum->gadget, dum->driver);
 			else
 				dum->driver->disconnect(&dum->gadget);