From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752763AbcHKOGu (ORCPT ); Thu, 11 Aug 2016 10:06:50 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:48559 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750741AbcHKOGr (ORCPT ); Thu, 11 Aug 2016 10:06:47 -0400 From: Christoph Hellwig To: tglx@linutronix.de Cc: linux-kernel@vger.kernel.org Subject: [PATCH for-4.8] irq/affinity: use get/put_online_cpus Date: Thu, 11 Aug 2016 07:06:45 -0700 Message-Id: <1470924405-25728-1-git-send-email-hch@lst.de> X-Mailer: git-send-email 2.1.4 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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