Commit f6a7409c authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki

cpufreq: Notify governors when cpus are hot-[un]plugged

Because cpufreq core and governors worry only about the online cpus, if a cpu is
hot [un]plugged, we must notify governors about it, otherwise be ready to expect
something unexpected.

We already have notifiers in the form of CPUFREQ_GOV_START/CPUFREQ_GOV_STOP, we
just need to call them now.
Signed-off-by: default avatarViresh Kumar <>
Signed-off-by: default avatarRafael J. Wysocki <>
parent 643ae6e8
......@@ -751,11 +751,16 @@ static int cpufreq_add_dev_policy(unsigned int cpu,
return -EBUSY;
__cpufreq_governor(managed_policy, CPUFREQ_GOV_STOP);
spin_lock_irqsave(&cpufreq_driver_lock, flags);
cpumask_copy(managed_policy->cpus, policy->cpus);
per_cpu(cpufreq_cpu_data, cpu) = managed_policy;
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
__cpufreq_governor(managed_policy, CPUFREQ_GOV_START);
__cpufreq_governor(managed_policy, CPUFREQ_GOV_LIMITS);
pr_debug("CPU already managed, adding link\n");
ret = sysfs_create_link(&dev->kobj,
......@@ -1066,8 +1071,13 @@ static int __cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif
if (unlikely(cpu != data->cpu)) {
pr_debug("removing link\n");
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
cpumask_clear_cpu(cpu, data->cpus);
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
__cpufreq_governor(data, CPUFREQ_GOV_START);
__cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
kobj = &dev->kobj;
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