[Xen-changelog] [xen-unstable] x86: Fix legacy irq allocation issue

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1245397438 -3600
# Node ID 07fea69baadc897acc8168c53c69c15714c76111
# Parent  f3211c71e8f0a9a704804256980cd49a41620aa6
x86: Fix legacy irq allocation issue

When try to assign vector for irq, we should not assign vector for
legacy irq, which has fixed mapped irq<->vector relationship.

Signed-off-by: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx>
---
 xen/arch/x86/irq.c |    6 ++++++
 1 files changed, 6 insertions(+)

diff -r f3211c71e8f0 -r 07fea69baadc xen/arch/x86/irq.c
--- a/xen/arch/x86/irq.c        Fri Jun 19 08:43:28 2009 +0100
+++ b/xen/arch/x86/irq.c        Fri Jun 19 08:43:58 2009 +0100
@@ -83,6 +83,12 @@ int assign_irq_vector(int irq)
     BUG_ON(irq >= nr_irqs && irq != AUTO_ASSIGN_IRQ);
 
     spin_lock(&vector_lock);
+
+    if ((irq != AUTO_ASSIGN_IRQ) && !IO_APIC_IRQ(irq))
+    {
+        spin_unlock(&vector_lock);
+        return LEGACY_VECTOR(irq);
+    }
 
     if ((irq != AUTO_ASSIGN_IRQ) && (IO_APIC_VECTOR(irq) > 0)) {
         spin_unlock(&vector_lock);

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