Index: usb-devel/drivers/bluetooth/btusb.c
===================================================================
--- usb-devel.orig/drivers/bluetooth/btusb.c
+++ usb-devel/drivers/bluetooth/btusb.c
@@ -1398,6 +1398,7 @@ static int btusb_submit_intr_urb(struct
 	}
 
 	pipe = usb_rcvintpipe(data->udev, data->intr_ep->bEndpointAddress);
+	dev_info(&data->intf->dev, "Pipe %x ep %p\n", pipe, data->intr_ep);
 
 	usb_fill_int_urb(urb, data->udev, pipe, buf, size,
 			 btusb_intr_complete, hdev, data->intr_ep->bInterval);
@@ -4283,6 +4284,9 @@ static int btusb_probe(struct usb_interf
 
 		if (!data->intr_ep && usb_endpoint_is_int_in(ep_desc)) {
 			data->intr_ep = ep_desc;
+			dev_info(&intf->dev, "Ep %p epaddr %x epattr %x\n",
+					ep_desc, ep_desc->bEndpointAddress,
+					ep_desc->bmAttributes);
 			continue;
 		}
 
Index: usb-devel/drivers/usb/core/urb.c
===================================================================
--- usb-devel.orig/drivers/usb/core/urb.c
+++ usb-devel/drivers/usb/core/urb.c
@@ -208,8 +208,11 @@ int usb_pipe_type_check(struct usb_devic
 	ep = usb_pipe_endpoint(dev, pipe);
 	if (!ep)
 		return -EINVAL;
-	if (usb_pipetype(pipe) != pipetypes[usb_endpoint_type(&ep->desc)])
+	if (usb_pipetype(pipe) != pipetypes[usb_endpoint_type(&ep->desc)]) {
+		dev_info(&dev->dev, "Error pipe %x ep %p epaddr %x\n",
+				pipe, &ep->desc, ep->desc.bEndpointAddress);
 		return -EINVAL;
+	}
 	return 0;
 }
 EXPORT_SYMBOL_GPL(usb_pipe_type_check);