LSR_RXRDY
} while (data & LSR_RXRDY && ++tries < try_count);
return (control & LSR_RXRDY);
return (inb(sp->ioaddr + com_lsr) & LSR_RXRDY);
} while (inb(sp->ioaddr + com_lsr) & LSR_RXRDY && ++tries < TRY_COUNT);
sc->lsr |= LSR_RXRDY;
sc->lsr &= ~LSR_RXRDY;