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Fix hangs caused by hardware that signals receive errors

Browse source 
(framing, parity, etc), but does not indicate characters
being received. Since no chracters have been received,
ignore the line errors.

PR:		131006
MFC after:	3 days
This commit is contained in:
Marcel Moolenaar 2009-04-08 00:14:06 +00:00
parent e12ce94f36
commit d7ae5af5c4
1 changed files with 9 additions and 6 deletions
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15
sys/dev/uart/uart_dev_ns8250.c
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@ -50,14 +50,16 @@ __FBSDID("$FreeBSD$");
static void
ns8250_clrint(struct uart_bas *bas)
{
uint8_t iir;
uint8_t iir, lsr;
iir = uart_getreg(bas, REG_IIR);
while ((iir & IIR_NOPEND) == 0) {
iir &= IIR_IMASK;
if (iir == IIR_RLS)
(void)uart_getreg(bas, REG_LSR);
else if (iir == IIR_RXRDY || iir == IIR_RXTOUT)
if (iir == IIR_RLS) {
lsr = uart_getreg(bas, REG_LSR);
if (lsr & (LSR_BI|LSR_FE|LSR_PE))
(void)uart_getreg(bas, REG_DATA);
} else if (iir == IIR_RXRDY || iir == IIR_RXTOUT)
(void)uart_getreg(bas, REG_DATA);
else if (iir == IIR_MLSC)
(void)uart_getreg(bas, REG_MSR);
@ -587,7 +589,6 @@ ns8250_bus_ipend(struct uart_softc *sc)
ipend = 0;
if (iir & IIR_RXRDY) {
lsr = uart_getreg(bas, REG_LSR);
uart_unlock(sc->sc_hwmtx);
if (lsr & LSR_OE)
ipend |= SER_INT_OVERRUN;
if (lsr & LSR_BI)
@ -595,12 +596,14 @@ ns8250_bus_ipend(struct uart_softc *sc)
if (lsr & LSR_RXRDY)
ipend |= SER_INT_RXREADY;
} else {
uart_unlock(sc->sc_hwmtx);
if (iir & IIR_TXRDY)
ipend |= SER_INT_TXIDLE;
else
ipend |= SER_INT_SIGCHG;
}
if (ipend == 0)
ns8250_clrint(bas);
uart_unlock(sc->sc_hwmtx);
return ((sc->sc_leaving) ? 0 : ipend);
}