[RFC 08/10] hw/mos6522: Call mos6522_update_irq() when appropriate

[Finn Thain]

It necessary to call mos6522_update_irq() when the interrupt flags
change and unnecessary when they haven't.

Signed-off-by: Finn Thain <fth...@linux-m68k.org>
---
 hw/misc/mos6522.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/misc/mos6522.c b/hw/misc/mos6522.c
index 0a241fe9f8..0dd3ccf945 100644
--- a/hw/misc/mos6522.c
+++ b/hw/misc/mos6522.c
@@ -208,11 +208,13 @@ uint64_t mos6522_read(void *opaque, hwaddr addr, unsigned 
size)
         s->timers[0].oneshot_fired = true;
         mos6522_timer1_update(s, &s->timers[0], now);
         s->ifr |= T1_INT;
+        mos6522_update_irq(s);
     }
     if (now >= s->timers[1].next_irq_time) {
         s->timers[1].oneshot_fired = true;
         mos6522_timer2_update(s, &s->timers[1], now);
         s->ifr |= T2_INT;
+        mos6522_update_irq(s);
     }
     switch (addr) {
     case VIA_REG_B:
@@ -237,7 +239,6 @@ uint64_t mos6522_read(void *opaque, hwaddr addr, unsigned 
size)
         break;
     case VIA_REG_T1CH:
         val = get_counter(s, &s->timers[0]) >> 8;
-        mos6522_update_irq(s);
         break;
     case VIA_REG_T1LL:
         val = s->timers[0].latch & 0xff;
-- 
2.26.3