From mboxrd@z Thu Jan 1 00:00:00 1970 From: Srinivas Ramana Subject: [PATCH] genirq: Make sure the affinity to be set is not empty Date: Thu, 20 Dec 2018 19:05:57 +0530 Message-ID: <1545312957-8504-1-git-send-email-sramana@codeaurora.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Srinivas Ramana List-Id: linux-arm-msm@vger.kernel.org If the default_affinity is managed/initialized by a system and all the cpus present in irq_default_affinity are hotplugged out we may end up passing a cpumask of 0 to irq_do_set_affinity(). Fix this by falling back to cpu_online_mask in case the calculated affinity becomes zero. Signed-off-by: Srinivas Ramana --- kernel/irq/manage.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 9dbdccab3b6a..5c0ba5ca5930 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -393,6 +393,9 @@ int irq_setup_affinity(struct irq_desc *desc) } cpumask_and(&mask, cpu_online_mask, set); + if (cpumask_empty(&mask)) + cpumask_copy(&mask, cpu_online_mask); + if (node != NUMA_NO_NODE) { const struct cpumask *nodemask = cpumask_of_node(node); -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.