[Xen-changelog] [xen-4.1-testing] x86: __pirq_guest_eoi() must check it is called for a fully

[Xen patchbot-4.1-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1301756772 -3600
# Node ID 952eb1beec07dc275c12070ccf56700ec911d2e8
# Parent  da7f8a5fe74dec224f28e277794bd22eb96d5323
x86: __pirq_guest_eoi() must check it is called for a fully
guest-bound irq before accessing desc->action.

Signed-off-by: Keir Fraser <keir@xxxxxxx>
xen-unstable changeset:   23103:48dac730a93b
xen-unstable date:        Sat Mar 26 09:42:01 2011 +0000
---


diff -r da7f8a5fe74d -r 952eb1beec07 xen/arch/x86/irq.c
--- a/xen/arch/x86/irq.c        Sat Apr 02 15:59:55 2011 +0100
+++ b/xen/arch/x86/irq.c        Sat Apr 02 16:06:12 2011 +0100
@@ -1022,6 +1022,12 @@
     if ( desc == NULL )
         return;
 
+    if ( !(desc->status & IRQ_GUEST) )
+    {
+        spin_unlock_irq(&desc->lock);
+        return;
+    }
+
     action = (irq_guest_action_t *)desc->action;
     irq = desc - irq_desc;
 

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