VIO_SND_DRING_REG
if (!ISSET(sc->sc_vio_state, VIO_SND_DRING_REG)) {
sc->sc_vio_state |= VIO_SND_DRING_REG;
sc->sc_vio_state |= VIO_SND_DRING_REG;
if (!ISSET(sc->sc_vio_state, VIO_SND_DRING_REG)) {