Commit-ID: 3ee0ce2a54dff07d09440723594df89bc1a12e79 Gitweb: http://git.kernel.org/tip/3ee0ce2a54dff07d09440723594df89bc1a12e79 Author: Christoph Hellwig <h...@lst.de> AuthorDate: Thu, 11 Aug 2016 07:06:45 -0700 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Mon, 22 Aug 2016 11:22:44 +0200
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: 5e385a6ef31f: "genirq: Add a helper to spread an affinity mask for MSI/MSI-X vectors" Signed-off-by: Christoph Hellwig <h...@lst.de> Link: http://lkml.kernel.org/r/1470924405-25728-1-git-send-email-...@lst.de Signed-off-by: Thomas Gleixner <t...@linutronix.de> --- kernel/irq/affinity.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c index f689593..32f6cfc 100644 --- a/kernel/irq/affinity.c +++ b/kernel/irq/affinity.c @@ -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; }
