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genirq: Make sure the initial affinity is not empty

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[ Upstream commit bddda606ec76550dd63592e32a6e87e7d32583f7 ]

If all CPUs in the irq_default_affinity mask are offline when an interrupt
is initialized then irq_setup_affinity() can set an empty affinity mask for
a newly allocated interrupt.

Fix this by falling back to cpu_online_mask in case the resulting affinity
mask is zero.

Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arm-msm@vger.kernel.org
Link: https://lkml.kernel.org/r/1545312957-8504-1-git-send-email-sramana@codeaurora.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Srinivas Ramana 2018-12-20 19:05:57 +05:30 • committed by Greg Kroah-Hartman
parent 7746dd64c2
commit 17fab8914f
1 changed files with 3 additions and 0 deletions
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3
kernel/irq/manage.c
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@ -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);