From a52521f149c42b35a28423ee30be9a7afa51dfbf Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Wed, 22 Sep 2010 15:28:52 -0700
Subject: xen: set up IRQ before binding virq to evtchn

Make sure the irq is set up before binding a virq event channel to it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index b4e7301..a336247 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -436,6 +436,11 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
 	irq = per_cpu(virq_to_irq, cpu)[virq];
 
 	if (irq == -1) {
+		irq = find_unbound_irq();
+
+		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
+					      handle_percpu_irq, "virq");
+
 		bind_virq.virq = virq;
 		bind_virq.vcpu = cpu;
 		if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
@@ -443,11 +448,6 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
 			BUG();
 		evtchn = bind_virq.port;
 
-		irq = find_unbound_irq();
-
-		set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
-					      handle_percpu_irq, "virq");
-
 		evtchn_to_irq[evtchn] = irq;
 		irq_info[irq] = mk_virq_info(evtchn, virq);
 
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