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serial: reinstate watch after migration 

Otherwise, a serial port can get stuck if it is migrated while flow control
is in effect.

Tested-by: Bret Ketchum <bcketchum@gmail.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-06-14 14:46:51 +02:00
parent a1df76da57
commit 9f34a35e00
1 changed files with 23 additions and 2 deletions
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25
hw/char/serial.c
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@ -644,8 +644,29 @@ static int serial_post_load(void *opaque, int version_id)
if (s->thr_ipending == -1) {
s->thr_ipending = ((s->iir & UART_IIR_ID) == UART_IIR_THRI);
}
if (s->tsr_retry > MAX_XMIT_RETRY) {
s->tsr_retry = MAX_XMIT_RETRY;
if (s->tsr_retry > 0) {
/* tsr_retry > 0 implies LSR.TEMT = 0 (transmitter not empty). */
if (s->lsr & UART_LSR_TEMT) {
error_report("inconsistent state in serial device "
"(tsr empty, tsr_retry=%d", s->tsr_retry);
return -1;
}
if (s->tsr_retry > MAX_XMIT_RETRY) {
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);
} else {
/* tsr_retry == 0 implies LSR.TEMT = 1 (transmitter empty). */
if (!(s->lsr & UART_LSR_TEMT)) {
error_report("inconsistent state in serial device "
"(tsr not empty, tsr_retry=0");
return -1;
}
}
s->last_break_enable = (s->lcr >> 6) & 1;