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x86: apic reset counter on shutdown 

Impact: avoid spurious lapic timer events on shutdown

The apic timer might be close to firing when it is shutdown. We can
not really disable the timer - we just mask the interrupt. That way we
can get an extra interrupt when it is reenabled. Set the counter to
max on shutdown to avoid this.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-11-06 01:13:39 +01:00
parent ba21ebb6ab
commit a98f8fd24f
1 changed files with 1 additions and 0 deletions
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1
arch/x86/kernel/apic.c
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@ -441,6 +441,7 @@ static void lapic_timer_setup(enum clock_event_mode mode,
v = apic_read(APIC_LVTT); v = apic_read(APIC_LVTT);
v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
apic_write(APIC_LVTT, v); apic_write(APIC_LVTT, v);
apic_write(APIC_TMICT, 0xffffffff);
break; break;
case CLOCK_EVT_MODE_RESUME: case CLOCK_EVT_MODE_RESUME:
/* Nothing to do here */ /* Nothing to do here */