ATH_CALLOUT_INIT
ATH_CALLOUT_INIT(&sc->sc_scan_ch, debug_mpsafenet ? CALLOUT_MPSAFE : 0);
ATH_CALLOUT_INIT(&sc->sc_cal_ch, CALLOUT_MPSAFE);
ATH_CALLOUT_INIT(&sc->sc_dfs_ch, CALLOUT_MPSAFE);
ATH_CALLOUT_INIT(&sc->sc_ledtimer, CALLOUT_MPSAFE);