sbmac_state_on
if (sc->sbm_state == sbmac_state_on)
sc->sbm_state = sbmac_state_on;
if (state == sbmac_state_on)
if (sc->sbm_state != sbmac_state_on)
sbmac_set_channel_state(sc, sbmac_state_on);
sbmac_set_channel_state(sc, sbmac_state_on);