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


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 4396f46c

kernel/irq/affinity.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

}