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KVM: i8254: simplify atomics in kvm_pit_ack_irq
We already have a helper that does the same thing. Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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1 changed files with 1 additions and 11 deletions
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@ -236,19 +236,9 @@ static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian)
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{
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struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state,
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irq_ack_notifier);
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int value;
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spin_lock(&ps->inject_lock);
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value = atomic_dec_return(&ps->pending);
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if (value < 0)
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/* spurious acks can be generated if, for example, the
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* PIC is being reset. Handle it gracefully here
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*/
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atomic_inc(&ps->pending);
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else if (value > 0 && ps->reinject)
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/* in this case, we had multiple outstanding pit interrupts
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* that we needed to inject. Reinject
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*/
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if (atomic_dec_if_positive(&ps->pending) > 0 && ps->reinject)
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queue_kthread_work(&ps->pit->worker, &ps->pit->expired);
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ps->irq_ack = 1;
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spin_unlock(&ps->inject_lock);
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