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xen: fix memory access violation bug when CONFIG_HAVE_SPARSE_IRQ is enabled

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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>
This commit is contained in:
Alex Nixon 2008-08-19 20:50:53 -07:00 committed by Ingo Molnar
parent 9d6a4d0823
commit 2b46b37de7
1 changed files with 2 additions and 0 deletions
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drivers/xen/events.c
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@ -141,6 +141,8 @@ static void init_evtchn_cpu_bindings(void)
/* 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