From 753fbd23f5e59ea9dc0cabe0a684d32100a4af02 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 4 Mar 2014 20:43:40 +0000 Subject: xen: Validate online cpus in set_affinity The user space interface does not filter out offline cpus. It merily verifies that the mask contains at least one online cpu. So the selector in the irq chip implementation needs to make sure to pick only an online cpu because otherwise: Offline Core 1 Set affinity to 0xe Selector will pick first set bit, i.e. core 1 Signed-off-by: Thomas Gleixner Reviewed-by: David Vrabel Cc: Peter Zijlstra Cc: Konrad Rzeszutek Wilk Cc: Xen Link: http://lkml.kernel.org/r/20140304203100.978031089@linutronix.de Signed-off-by: Thomas Gleixner --- drivers/xen/events/events_base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/xen') diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 8b91c2561b68..c3458f58de90 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1324,7 +1324,7 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu) static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest, bool force) { - unsigned tcpu = cpumask_first(dest); + unsigned tcpu = cpumask_first_and(dest, cpu_online_mask); return rebind_irq_to_cpu(data->irq, tcpu); } -- cgit v1.2.3-59-g8ed1b