athn_usb_stop
athn_usb_stop(ifp, 0);
Static void athn_usb_stop(struct ifnet *, int disable);
athn_usb_stop(ifp, 0);
athn_usb_stop(ifp, 0);
ifp->if_stop = athn_usb_stop;
athn_usb_stop(&sc->sc_if, 0);