LCDKP_HAS_BUF
sc->sc_flags &= ~LCDKP_HAS_BUF;
if (sc->sc_flags & LCDKP_HAS_BUF) {
sc->sc_flags |= LCDKP_HAS_BUF;
if (!(sc->sc_flags & LCDKP_HAS_BUF)) {
sc->sc_flags |= LCDKP_HAS_BUF;
ret = (sc->sc_flags & LCDKP_HAS_BUF);