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Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/ioapic.c37
1 files changed, 19 insertions, 18 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index ef61d529a6c4..cfb7e4d52dc2 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -197,28 +197,29 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
u32 old_irr;
u32 mask = 1 << irq;
union kvm_ioapic_redirect_entry entry;
- int ret = 1;
+ int ret, irq_level;
+
+ BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
spin_lock(&ioapic->lock);
old_irr = ioapic->irr;
- if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
- int irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
- irq_source_id, level);
- entry = ioapic->redirtbl[irq];
- irq_level ^= entry.fields.polarity;
- if (!irq_level)
- ioapic->irr &= ~mask;
- else {
- int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
- ioapic->irr |= mask;
- if ((edge && old_irr != ioapic->irr) ||
- (!edge && !entry.fields.remote_irr))
- ret = ioapic_service(ioapic, irq);
- else
- ret = 0; /* report coalesced interrupt */
- }
- trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
+ irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
+ irq_source_id, level);
+ entry = ioapic->redirtbl[irq];
+ irq_level ^= entry.fields.polarity;
+ if (!irq_level) {
+ ioapic->irr &= ~mask;
+ ret = 1;
+ } else {
+ int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
+ ioapic->irr |= mask;
+ if ((edge && old_irr != ioapic->irr) ||
+ (!edge && !entry.fields.remote_irr))
+ ret = ioapic_service(ioapic, irq);
+ else
+ ret = 0; /* report coalesced interrupt */
}
+ trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
spin_unlock(&ioapic->lock);
return ret;