Otherwise, this can cause serial_xmit to be entered with LSR.TEMT=0,
which is invalid and causes an assertion failure.
Reported-by: Bret Ketchum <bcketc...@gmail.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
hw/char/serial.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/hw/char/serial.c b/hw/char/serial.c
index d232473..7c196e2 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -228,6 +228,7 @@ static gboolean serial_watch_cb(GIOChannel *chan,
GIOCondition cond,
void *opaque)
{
SerialState *s = opaque;
+ s->watch_tag = 0;
serial_xmit(s);
return FALSE;
}
@@ -258,10 +259,12 @@ static void serial_xmit(SerialState *s)
if (s->mcr & UART_MCR_LOOP) {
/* in loopback mode, say that we just received a char */
serial_receive1(s, &s->tsr, 1);
- } else if (qemu_chr_fe_write(s->chr, &s->tsr, 1) != 1) {
- if (s->tsr_retry < MAX_XMIT_RETRY &&
- qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP,
- serial_watch_cb, s) > 0) {
+ } else if (qemu_chr_fe_write(s->chr, &s->tsr, 1) != 1 &&
+ s->tsr_retry < MAX_XMIT_RETRY) {
+ assert(s->watch_tag == 0);
+ s->watch_tag = qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP,
+ serial_watch_cb, s);
+ if (s->watch_tag > 0) {
s->tsr_retry++;
return;
}
@@ -834,6 +837,11 @@ static void serial_reset(void *opaque)
{
SerialState *s = opaque;
+ if (s->watch_tag > 0) {
+ g_source_remove(s->watch_tag);
+ s->watch_tag = 0;
+ }
+
s->rbr = 0;
s->ier = 0;
s->iir = UART_IIR_NO_INT;
--
2.5.5
