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
@@ -1826,6 +1826,7 @@ static void dummy_timer(struct timer_lis
 			break;
 		dum->ep[i].already_seen = 0;
 	}
+	dev_info(dummy_dev(dum_hcd), "Timer handler\n");
 
 restart:
 	list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
@@ -1835,6 +1836,9 @@ restart:
 		struct dummy_ep		*ep = NULL;
 		int			status = -EINPROGRESS;
 
+		dev_info(dummy_dev(dum_hcd), "urbp %p %x next_frame %p\n",
+				urbp, urbp->urb->pipe, dum_hcd->next_frame_urbp);
+
 		/* stop when we reach URBs queued after the timer interrupt */
 		if (urbp == dum_hcd->next_frame_urbp)
 			break;
Index: usb-devel/drivers/usb/class/cdc-wdm.c
===================================================================
--- usb-devel.orig/drivers/usb/class/cdc-wdm.c
+++ usb-devel/drivers/usb/class/cdc-wdm.c
@@ -112,6 +112,7 @@ struct wdm_device {
 
 	enum wwan_port_type	wwanp_type;
 	struct wwan_port	*wwanp;
+	int			alancount;
 };
 
 static struct usb_driver wdm_driver;
@@ -255,6 +256,14 @@ static void wdm_int_callback(struct urb
 	desc = urb->context;
 	dr = (struct usb_cdc_notification *)desc->sbuf;
 
+	if (status == -EPROTO) {
+		if (desc->alancount >= 1)
+			return;
+		++desc->alancount;
+		dev_info(&desc->intf->dev, "Alan test\n");
+		dump_stack();
+	}
+
 	if (status) {
 		switch (status) {
 		case -ESHUTDOWN: