cpufreq: Store cpufreq policies in a list
Policies available in the cpufreq framework are now linked together.
They are accessible via cpufreq_policy_list defined in the cpufreq
core.
[rjw: Fix from Yinghai Lu folded in]
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 9e83d91..75c5bd4 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -40,6 +40,7 @@
static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data_fallback);
static DEFINE_RWLOCK(cpufreq_driver_lock);
static DEFINE_MUTEX(cpufreq_governor_lock);
+static LIST_HEAD(cpufreq_policy_list);
#ifdef CONFIG_HOTPLUG_CPU
/* This one keeps track of the previously set governor of a removed CPU */
@@ -952,6 +953,7 @@
if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
goto err_free_cpumask;
+ INIT_LIST_HEAD(&policy->policy_list);
return policy;
err_free_cpumask:
@@ -964,6 +966,12 @@
static void cpufreq_policy_free(struct cpufreq_policy *policy)
{
+ unsigned long flags;
+
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
+ list_del(&policy->policy_list);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
free_cpumask_var(policy->related_cpus);
free_cpumask_var(policy->cpus);
kfree(policy);
@@ -1077,6 +1085,10 @@
ret = cpufreq_add_dev_interface(policy, dev);
if (ret)
goto err_out_unregister;
+
+ write_lock_irqsave(&cpufreq_driver_lock, flags);
+ list_add(&policy->policy_list, &cpufreq_policy_list);
+ write_unlock_irqrestore(&cpufreq_driver_lock, flags);
}
cpufreq_init_policy(policy);
