GUS_LOCKED
if (sc->sc_playbuf == sc->sc_dmabuf && (sc->sc_flags & GUS_LOCKED)) {
sc->sc_flags &= ~(GUS_DMAOUT_ACTIVE|GUS_LOCKED);
sc->sc_flags |= GUS_LOCKED;
sc->sc_flags &= ~(GUS_OPEN|GUS_LOCKED|GUS_DMAOUT_ACTIVE|GUS_DMAIN_ACTIVE);
sc->sc_flags &= ~GUS_LOCKED;
if (sc->sc_dmaoutintr && !(sc->sc_flags & GUS_LOCKED)) {