diff options
| author | Marcel Moolenaar <marcel@FreeBSD.org> | 2003-09-17 03:11:32 +0000 |
|---|---|---|
| committer | Marcel Moolenaar <marcel@FreeBSD.org> | 2003-09-17 03:11:32 +0000 |
| commit | 44ed791b92a2d5a5a2ec7dceeaac65e9749a8eda (patch) | |
| tree | 4391e07d78aa2696fba66501852f450d6193838e /sys/dev/uart/uart_dev_ns8250.c | |
| parent | 8225548ebf2675ce79910d8e59e8aaae9e4cbf9e (diff) | |
Notes
Diffstat (limited to 'sys/dev/uart/uart_dev_ns8250.c')
| -rw-r--r-- | sys/dev/uart/uart_dev_ns8250.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/sys/dev/uart/uart_dev_ns8250.c b/sys/dev/uart/uart_dev_ns8250.c index 7c4d26424c97..44d1304fc149 100644 --- a/sys/dev/uart/uart_dev_ns8250.c +++ b/sys/dev/uart/uart_dev_ns8250.c @@ -716,16 +716,25 @@ ns8250_bus_receive(struct uart_softc *sc) bas = &sc->sc_bas; mtx_lock_spin(&sc->sc_hwmtx); - while (!uart_rx_full(sc)) { - lsr = uart_getreg(bas, REG_LSR); - if ((lsr & LSR_RXRDY) == 0) + lsr = uart_getreg(bas, REG_LSR); + while (lsr & LSR_RXRDY) { + if (uart_rx_full(sc)) { + sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN; break; + } xc = uart_getreg(bas, REG_DATA); if (lsr & LSR_FE) xc |= UART_STAT_FRAMERR; if (lsr & LSR_PE) xc |= UART_STAT_PARERR; uart_rx_put(sc, xc); + lsr = uart_getreg(bas, REG_LSR); + } + /* Discard everything left in the Rx FIFO. */ + while (lsr & LSR_RXRDY) { + (void)uart_getreg(bas, REG_DATA); + uart_barrier(bas); + lsr = uart_getreg(bas, REG_LSR); } mtx_unlock_spin(&sc->sc_hwmtx); return (0); |