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| author | Christoph Hellwig <hch@lst.de> | 2016-08-11 07:06:45 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-08-22 11:22:44 +0200 |
| commit | 3ee0ce2a54dff07d09440723594df89bc1a12e79 (patch) | |
| tree | 68a27c262c9f41cf768856730927e9d8467d111b /kernel | |
| parent | 4396f46c8c628329bd35ee4b84140b8b001a11eb (diff) | |
| download | linux-3ee0ce2a54dff07d09440723594df89bc1a12e79.tar.gz linux-3ee0ce2a54dff07d09440723594df89bc1a12e79.tar.bz2 linux-3ee0ce2a54dff07d09440723594df89bc1a12e79.zip | |
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 <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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/affinity.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c index f68959341c0f..32f6cfcff212 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; } |