diff options
Diffstat (limited to 'drivers/serial/pmac_zilog.c')
| -rw-r--r-- | drivers/serial/pmac_zilog.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c index 0700cd10b97c..683e66f18e8c 100644 --- a/drivers/serial/pmac_zilog.c +++ b/drivers/serial/pmac_zilog.c @@ -411,6 +411,17 @@ static void pmz_transmit_chars(struct uart_pmac_port *uap) goto ack_tx_int; } + /* Under some circumstances, we see interrupts reported for + * a closed channel. The interrupt mask in R1 is clear, but + * R3 still signals the interrupts and we see them when taking + * an interrupt for the other channel (this could be a qemu + * bug but since the ESCC doc doesn't specify precsiely whether + * R3 interrup status bits are masked by R1 interrupt enable + * bits, better safe than sorry). --BenH. + */ + if (!ZS_IS_OPEN(uap)) + goto ack_tx_int; + if (uap->port.x_char) { uap->flags |= PMACZILOG_FLAG_TX_ACTIVE; write_zsdata(uap, uap->port.x_char); |