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parisc: Validate online cpus in irq_set_affinity() callbacks

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The [user space] interface does not filter out offline cpus. It merily
guarantees 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 (is valid due to online mask 0xd)
     cpumask_first will pick core 1, which is offline

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
Link: http://lkml.kernel.org/r/20140304203100.859489993@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2014-03-04 20:43:40 +00:00
parent 753fbd23f5
commit 1ed71e59bc
1 changed files with 1 additions and 1 deletions
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2
arch/parisc/kernel/irq.c
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@ -117,7 +117,7 @@ int cpu_check_affinity(struct irq_data *d, const struct cpumask *dest)
return -EINVAL;
/* whatever mask they set, we just allow one CPU */
cpu_dest = first_cpu(*dest);
cpu_dest = cpumask_first_and(dest, cpu_online_mask);
return cpu_dest;
}