linux-kernel - [PATCH for-4.8] irq/affinity: use get/put_online

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Message-Id: <1470924405-25728-1-git-send-email-hch@lst.de>
Date:	Thu, 11 Aug 2016 07:06:45 -0700
From:	Christoph Hellwig <hch@....de>
To:	tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH for-4.8] irq/affinity: use get/put_online_cpus

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 <hch@....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;
 }
-- 
2.1.4