--- zzzz-none-000/linux-2.6.39.4/drivers/usb/core/hcd.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/drivers/usb/core/hcd.c	2021-11-10 13:38:17.000000000 +0000
@@ -1455,6 +1455,9 @@
 	atomic_inc(&urb->use_count);
 	atomic_inc(&urb->dev->urbnum);
 	usbmon_urb_submit(&hcd->self, urb);
+#ifdef AVM_USB_TRACE
+	avm_usb_trace_submit(hcd, urb);
+#endif
 
 	/* NOTE requirements on root-hub callers (usbfs and the hub
 	 * driver, for now):  URBs' urb->transfer_buffer must be
@@ -1477,6 +1480,10 @@
 
 	if (unlikely(status)) {
 		usbmon_urb_submit_error(&hcd->self, urb, status);
+#ifdef AVM_USB_TRACE
+		avm_usb_trace_error(hcd, urb, status);
+#endif
+
 		urb->hcpriv = NULL;
 		INIT_LIST_HEAD(&urb->urb_list);
 		atomic_dec(&urb->use_count);
@@ -1579,6 +1586,10 @@
 
 	unmap_urb_for_dma(hcd, urb);
 	usbmon_urb_complete(&hcd->self, urb, status);
+#ifdef AVM_USB_TRACE
+	avm_usb_trace_complete(hcd, urb, status);
+#endif
+
 	usb_unanchor_urb(urb);
 
 	/* pass ownership to the completion handler */
@@ -1764,6 +1775,8 @@
 		struct usb_interface *iface = usb_ifnum_to_if(udev,
 				cur_alt->desc.bInterfaceNumber);
 
+		if (!iface)
+			return -EINVAL;
 		if (iface->resetting_device) {
 			/*
 			 * The USB core just reset the device, so the xHCI host
@@ -2460,6 +2473,11 @@
 	}
 	if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
 		usb_hcd_poll_rh_status(hcd);
+
+#ifdef AVM_USB_TRACE
+	avm_usb_register_trace_device (hcd);
+#endif
+
 	return retval;
 
 error_create_attr_group:
@@ -2554,6 +2572,10 @@
 			free_irq(hcd->irq, hcd);
 	}
 
+#ifdef AVM_USB_TRACE
+	avm_usb_deregister_trace_device (hcd);
+#endif
+
 	usb_put_dev(hcd->self.root_hub);
 	usb_deregister_bus(&hcd->self);
 	hcd_buffer_destroy(hcd);