UDBP_FLAG_READ_STALL
if (sc->sc_flags & UDBP_FLAG_READ_STALL) {
sc->sc_flags |= UDBP_FLAG_READ_STALL;
sc->sc_flags &= ~UDBP_FLAG_READ_STALL;
sc->sc_flags |= (UDBP_FLAG_READ_STALL |