xen: fix memory access violation bug when CONFIG_HAVE_SPARSE_IRQ is enabled
When sparse IRQs are enabled, it is not safe to assume an IRQ descriptor
exists for every possible IRQ. This patch causes init_evtchn_cpu_bindings
to skip initialisation of IRQ descriptors which don't exist.
Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Acked-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 56ace47..e6d47e8 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -141,6 +141,8 @@
/* By default all event channels notify CPU#0. */
for (i = 0; i < nr_irqs; i++) {
struct irq_desc *desc = irq_to_desc(i);
+ if (!desc)
+ continue;
desc->affinity = cpumask_of_cpu(0);
}
#endif