usbd_transfer_poll
usbd_transfer_poll(sc->sc_xfer, UKBD_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer + USBHID_INTR_IN_DT, 1);
usbd_transfer_poll(sc->sc_xfer + POLL_XFER(USBHID_INTR_IN_DT), 1);
usbd_transfer_poll(sc->sc_xfer + xfer_idx, 1);
usbd_transfer_poll(sc->sc_xfer[ucom->sc_subunit], U3G_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UARK_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UBSA_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UBSER_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UCHCOM_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UCYCOM_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UDBC_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UFINTEK_N_TRANSFER);
usbd_transfer_poll(sc->sc_ctrl_xfer, UFOMA_CTRL_ENDPT_MAX);
usbd_transfer_poll(sc->sc_bulk_xfer, UFOMA_BULK_ENDPT_MAX);
usbd_transfer_poll(sc->sc_xfer, UFTDI_N_TRANSFER);
usbd_transfer_poll(ssc->sc_xfer, UGENSA_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UIPAQ_N_TRANSFER);
usbd_transfer_poll(sc->sc_ports[ucom->sc_portno].sc_xfer, UMCS7840_N_TRANSFERS);
usbd_transfer_poll(&sc->sc_intr_xfer, 1);
usbd_transfer_poll(sc->sc_xfer, UMCT_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UMODEM_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UMOSCOM_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UPLCOM_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, USLCOM_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UVSCOM_N_TRANSFER);
usbd_transfer_poll(sc->sc_xfer, UMASS_T_MAX);
void usbd_transfer_poll(struct usb_xfer **ppxfer, uint16_t max);