ulpt_detach Function

The ulpt_detach function is the device_detach implementation for ulpt(4). Here is its function definition:

static int
ulpt_detach(device_t dev)
{
        struct ulpt_softc *sc = device_get_softc(dev);

      usb_fifo_detach(&sc->sc_fifo);
      usb_fifo_detach(&sc->sc_fifo_no_reset);

        mtx_lock(&sc->sc_mutex);
      usb_callout_stop(&sc->sc_watchdog);
        mtx_unlock(&sc->sc_mutex);

      usbd_transfer_unsetup(sc->sc_transfer, ULPT_N_TRANSFER);
      usb_callout_drain(&sc->sc_watchdog);
      mtx_destroy(&sc->sc_mutex);

        return (0);
}

This function starts by destroying its device nodes. Then it stops the callout function, tears down the USB transfers, drains the callout function, and destroys its mutex.