DA_FLAG_OPEN
if (softc->flags & DA_FLAG_OPEN)
if (((softc->flags & DA_FLAG_OPEN) == 0)
softc->flags |= DA_FLAG_OPEN;
softc->flags &= ~DA_FLAG_OPEN;
if (softc->flags & DA_FLAG_OPEN) {
softc->flags &= ~DA_FLAG_OPEN;