xhci_device_generic_start
usbd_status xhci_device_generic_start(struct usbd_xfer *);
.start = xhci_device_generic_start,
.start = xhci_device_generic_start,
return (xhci_device_generic_start(SIMPLEQ_FIRST(&xfer->pipe->queue)));
xhci_device_generic_start(xfer);