[PULL 15/16] hw/i8254: fix vmstate load

[Paolo Bonzini]

From: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>

QEMU timer of channel 0 in i8254 is used to raise irq
at the specified moment of time. This irq can be disabled
with irq_disabled flag. But when vmstate of the pit is
loaded, timer may be rearmed despite the disabled interrupts.
This patch adds irq_disabled flag check to fix that.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Message-Id: <161537170060.6654.9430112746749476215.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/timer/i8254.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/timer/i8254.c b/hw/timer/i8254.c
index c01ee2c72a..c8388ea432 100644
--- a/hw/timer/i8254.c
+++ b/hw/timer/i8254.c
@@ -324,7 +324,7 @@ static void pit_post_load(PITCommonState *s)
 {
     PITChannelState *sc = &s->channels[0];
 
-    if (sc->next_transition_time != -1) {
+    if (sc->next_transition_time != -1 && !sc->irq_disabled) {
         timer_mod(sc->irq_timer, sc->next_transition_time);
     } else {
         timer_del(sc->irq_timer);
-- 
2.26.2