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