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From: Greg KH on 30 Jul 2010 13:50
2.6.33-stable review patch. If anyone has any objections, please let us know.

------------------

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

KVM-Stable-Tag
Signed-off-by: Marcelo Tosatti <mtosatti(a)redhat.com>
(cherry picked from comit 07dc7263b99e4ddad2b4c69765a428ccb7d48938)
---
virt/kvm/ioapic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -177,12 +177,13 @@ static int ioapic_deliver(struct kvm_ioa

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;

mutex_lock(&ioapic->lock);
+ old_irr = ioapic->irr;
if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
entry = ioapic->redirtbl[irq];
level ^= entry.fields.polarity;


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