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genirq/affinity: Use get/put_online_cpus around cpumask operations

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Without locking out CPU mask operations we might end up with an inconsistent
view of the cpumask in the function.

Fixes: 5e385a6ef3: "genirq: Add a helper to spread an affinity mask for MSI/MSI-X vectors"
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/1470924405-25728-1-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Christoph Hellwig 2016-08-11 07:06:45 -07:00 committed by Thomas Gleixner
parent 4396f46c8c
commit 3ee0ce2a54
1 changed files with 2 additions and 0 deletions
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2
kernel/irq/affinity.c
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@ -39,6 +39,7 @@ struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs)
return NULL; return NULL;
} }
get_online_cpus();
if (max_vecs >= num_online_cpus()) { if (max_vecs >= num_online_cpus()) {
cpumask_copy(affinity_mask, cpu_online_mask); cpumask_copy(affinity_mask, cpu_online_mask);
*nr_vecs = num_online_cpus(); *nr_vecs = num_online_cpus();
@ -56,6 +57,7 @@ struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs)
} }
*nr_vecs = vecs; *nr_vecs = vecs;
} }
put_online_cpus();
return affinity_mask; return affinity_mask;
} }