[Xen-devel] [PATCH] Fix legacy irq allocation issue

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

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>


diff -r 2acd065485e8 xen/arch/x86/irq.c
--- a/xen/arch/x86/irq.c    Sun Jun 14 23:12:24 2009 +0800
+++ b/xen/arch/x86/irq.c    Wed Jun 17 08:51:43 2009 +0800
@@ -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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