Commit 3ee0ce2a authored Aug 11, 2016 by Christoph Hellwig Committed by Thomas Gleixner Aug 22, 2016

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: 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>

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;
		}