From: Keir Fraser <keir.fraser@citrix.com>
Date: Fri, 19 Jun 2009 07:43:58 +0000 (+0100)
Subject: x86: Fix legacy irq allocation issue
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~13723
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success//%22http:/www.example.com/cgi/success/?a=commitdiff_plain;h=65afc94bc6d68cf42c9bfef8c56b50ceba60ed98;p=xen.git

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@intel.com>
---

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index 8abaab913e..42e2b9d0ea 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -84,6 +84,12 @@ int assign_irq_vector(int 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);
         return IO_APIC_VECTOR(irq);