KVM: read apic->irr with ioapic lock held

Read ioapic->irr inside ioapic->lock protected section.

KVM-Stable-Tag
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 7c79c1d76d0c..3500dee9cf2b 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -192,12 +192,13 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 
 int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
 {
-        u32 old_irr = ioapic->irr;
+        u32 old_irr;
         u32 mask = 1 << irq;
         union kvm_ioapic_redirect_entry entry;
         int ret = 1;
 
         spin_lock(&ioapic->lock);
+        old_irr = ioapic->irr;
         if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
                 entry = ioapic->redirtbl[irq];
                 level ^= entry.fields.polarity;