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>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 2924faa7f6c..46625cd3874 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;
 }