From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Wed, 17 Dec 2008 21:42:29 +0000 (-0800)
Subject: sparseirq, xen: make sure irq_desc is allocated for interrupts
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6f8a0ed4e5d86c01db5e7e3f95d9003b7cf9cb87;p=linux-beck.git

sparseirq, xen: make sure irq_desc is allocated for interrupts

Impact: fix crash

Make sure all Xen irqs have an irq_desc.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 2924faa7f6c4..46625cd38743 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -233,6 +233,7 @@ static void unmask_evtchn(int port)
 static int find_unbound_irq(void)
 {
 	int irq;
+	struct irq_desc *desc;
 
 	/* Only allocate from dynirq range */
 	for (irq = 0; irq < nr_irqs; irq++)
@@ -242,6 +243,10 @@ static int find_unbound_irq(void)
 	if (irq == nr_irqs)
 		panic("No available IRQ to bind to: increase nr_irqs!\n");
 
+	desc = irq_to_desc_alloc_cpu(irq, 0);
+	if (WARN_ON(desc == NULL))
+		return -1;
+
 	return irq;
 }