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[Xen-devel] [PATCH] Fix legacy irq allocation issue
| To: | Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] Fix legacy irq allocation issue |
| From: | "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> |
| Date: | Fri, 19 Jun 2009 10:03:06 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | |
| Delivery-date: | Thu, 18 Jun 2009 19:05:51 -0700 |
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| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
| Thread-index: | AcnwghXvpFCkneNoSnu3RqkaGU95PA== |
| Thread-topic: | [PATCH] 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>
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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