Commit 3ee0ce2a authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Thomas Gleixner

genirq/affinity: Use get/put_online_cpus around cpumask operations

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

Fixes: 5e385a6e: "genirq: Add a helper to spread an affinity mask for MSI/MSI-X vectors"
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/1470924405-25728-1-git-send-email-hch@lst.deSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 4396f46c
......@@ -39,6 +39,7 @@ struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs)
return NULL;
}
get_online_cpus();
if (max_vecs >= num_online_cpus()) {
cpumask_copy(affinity_mask, cpu_online_mask);
*nr_vecs = num_online_cpus();
......@@ -56,6 +57,7 @@ struct cpumask *irq_create_affinity_mask(unsigned int *nr_vecs)
}
*nr_vecs = vecs;
}
put_online_cpus();
return affinity_mask;
}
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