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KVM: Handle spurious acks for PIT interrupts
author
Avi Kivity
<avi@qumranet.com>
Sun, 17 Aug 2008 13:03:46 +0000
(16:03 +0300)
committer
Avi Kivity
<avi@qumranet.com>
Wed, 15 Oct 2008 08:15:19 +0000
(10:15 +0200)
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 <avi@qumranet.com>
arch/x86/kvm/i8254.c
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diff --git
a/arch/x86/kvm/i8254.c
b/arch/x86/kvm/i8254.c
index
7d04dd3
..
c842060
100644
(file)
--- 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);
}