linux-kernel - [112/140] KVM: read apic->irr with ioapic lock held

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Date:	Fri, 30 Jul 2010 10:31:17 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: [112/140] KVM: read apic->irr with ioapic lock held

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@...hat.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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