Without locking out CPU mask operations we might end up with an inconsistent view of the cpumask in the function.
Signed-off-by: Christoph Hellwig <[email protected]> --- 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; } -- 2.1.4
