sc->sc_numbufs++;
bt_free_buf(sc, buf)	struct bt_softc *sc;	struct bt_buf *buf;{	int s;	s = splbio();	TAILQ_INSERT_HEAD(&sc->sc_free_buf, buf, chain);	/*	 * If there were none, wake anybody waiting for one to come free,	 * starting with queued entries.	 */	if (buf->chain.tqe_next == 0)		wakeup(&sc->sc_free_buf);	splx(s);}