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cpufreq: Restore policy min/max limits on CPU online 

On CPU online the cpufreq core restores the previous governor (or
the previous "policy" setting for ->setpolicy drivers), but it does
not restore the min/max limits at the same time, which is confusing,
inconsistent and real pain for users who set the limits and then
suspend/resume the system (using full suspend), in which case the
limits are reset on all CPUs except for the boot one.

Fix this by making cpufreq_online() restore the limits when an inactive
policy is brought online.

The commit log and patch are inspired from Rafael's earlier work.

Reported-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 4.3+ <stable@vger.kernel.org> # 4.3+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2017-03-21 11:36:06 +05:30 committed by Rafael J. Wysocki
parent 9b4f603e7a
commit ff010472fb
1 changed files with 3 additions and 0 deletions
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3
drivers/cpufreq/cpufreq.c
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@ -1184,6 +1184,9 @@ static int cpufreq_online(unsigned int cpu)
for_each_cpu(j, policy->related_cpus) for_each_cpu(j, policy->related_cpus)
per_cpu(cpufreq_cpu_data, j) = policy; per_cpu(cpufreq_cpu_data, j) = policy;
write_unlock_irqrestore(&cpufreq_driver_lock, flags); write_unlock_irqrestore(&cpufreq_driver_lock, flags);
} else {
policy->min = policy->user_policy.min;
policy->max = policy->user_policy.max;
} }
if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {