pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
length = usb_maxpacket(umidi->dev, pipe, 0);
for (i = 0; i < INPUT_URBS; ++i) {
pipe = usb_rcvbulkpipe(umidi->dev, ep_info->in_ep);
length = usb_maxpacket(umidi->dev, pipe, 0);
for (i = 0; i < INPUT_URBS; ++i) {