diff options
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 7c4d26424c97c..44d1304fc149a 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); |