[PATCH 06/10] cpufreq: Store cpufreq policies in a list

Viresh Kumar
2013-08-03T11:50:34Z

From: Lukasz Majewski <l.majewski@samsung.com>

Policies available in a cpufreq framework are now linked together. They are
accessible via cpufreq_policy_list defined at cpufreq core.

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>
---
drivers/cpufreq/cpufreq.c | 11 +++++++++++
include/linux/cpufreq.h | 1 +
2 files changed, 12 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 496e31c..4c3aef0 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -39,6 +39,7 @@ static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
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 */
@@ -963,6 +964,12 @@ err_free_policy:

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);
@@ -1076,6 +1083,10 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
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);
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 9876712..d272fa4 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -82,6 +82,7 @@ struct cpufreq_policy {

struct cpufreq_real_policy user_policy;

+ struct list_head policy_list;
struct kobject kobj;
struct completion kobj_unregister;
int transition_ongoing; /* Tracks transition status */
--
1.7.12.rc2.18.g61b472e