Commit 25c2dd34 authored Mar 11, 2016 by Arun KS

cpufreq_stats: Disable cpu hotplug during stats table creation



During boot there is a possibility for two execution context to create
stats percpu variable concurrently. One called from cpufreq_stats_init
context and other as a part of policy notifier call back. This will
result in corrupted stats variable.

Disable cpu hotplug to avoid corruption.

Change-Id: Iefe2d6b370f6ec303286afc139fa9913fa9a4099
Suggested-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Arun KS <arunks@codeaurora.org>

parent dd0af8d2

drivers/cpufreq/cpufreq_stats.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -682,16 +682,20 @@ static int __init cpufreq_stats_init(void)
		if (ret)
		return ret;

		get_online_cpus();
		for_each_online_cpu(cpu)
		cpufreq_stats_create_table(cpu);
		put_online_cpus();

		ret = cpufreq_register_notifier(&notifier_trans_block,
		CPUFREQ_TRANSITION_NOTIFIER);
		if (ret) {
		cpufreq_unregister_notifier(&notifier_policy_block,
		CPUFREQ_POLICY_NOTIFIER);
		get_online_cpus();
		for_each_online_cpu(cpu)
		cpufreq_stats_free_table(cpu);
		put_online_cpus();
		return ret;
		}