| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 47/76] cpufreq: Restore policy min/max limits on CPU online | Date | Tue, 28 Mar 2017 14:30:44 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Viresh Kumar <viresh.kumar@linaro.org>
commit ff010472fb75670cb5c08671e820eeea3af59c87 upstream.
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> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/cpufreq/cpufreq.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1186,6 +1186,9 @@ static int cpufreq_online(unsigned int c for_each_cpu(j, policy->related_cpus) per_cpu(cpufreq_cpu_data, j) = policy; 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) {
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