[PATCH 07/39] KVM: Handle spurious acks for PIT interrupts

[Avi Kivity]

From: Avi Kivity <[EMAIL PROTECTED]>

Spurious acks can be generated, for example if the PIC is being reset.
Handle those acks gracefully rather than flooding the log with warnings.

Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
 arch/x86/kvm/i8254.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 7d04dd3..c842060 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -228,7 +228,7 @@ void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian)
                                                 irq_ack_notifier);
        spin_lock(&ps->inject_lock);
        if (atomic_dec_return(&ps->pit_timer.pending) < 0)
-               WARN_ON(1);
+               atomic_inc(&ps->pit_timer.pending);
        ps->irq_ack = 1;
        spin_unlock(&ps->inject_lock);
 }
-- 
1.6.0.1

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