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Subject[PATCH 2/6] thermal/drivers/cpu_cooling: Unregister with the policy
Date
Currently the function cpufreq_cooling_register() returns a cooling
device pointer which is used back as a pointer to call the function
cpufreq_cooling_unregister(). Even if it is correct, it would make
sense to not leak the structure inside a cpufreq driver and keep the
code thermal code self-encapsulate. Moreover, that forces to add an
extra variable in each driver using this function.

Instead of passing the cooling device to unregister, pass the policy.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
drivers/cpufreq/arm_big_little.c | 2 +-
drivers/cpufreq/cpufreq.c | 2 +-
drivers/thermal/cpu_cooling.c | 18 ++++++++++--------
drivers/thermal/imx_thermal.c | 4 ++--
.../thermal/ti-soc-thermal/ti-thermal-common.c | 2 +-
include/linux/cpu_cooling.h | 6 +++---
6 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
index 7fe52fcddcf1..6b243202caa9 100644
--- a/drivers/cpufreq/arm_big_little.c
+++ b/drivers/cpufreq/arm_big_little.c
@@ -502,7 +502,7 @@ static int bL_cpufreq_exit(struct cpufreq_policy *policy)
int cur_cluster = cpu_to_cluster(policy->cpu);

if (cur_cluster < MAX_CLUSTERS) {
- cpufreq_cooling_unregister(cdev[cur_cluster]);
+ cpufreq_cooling_unregister(policy);
cdev[cur_cluster] = NULL;
}

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 7c72f7d3509c..dfbc9bea606c 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1469,7 +1469,7 @@ static int cpufreq_offline(unsigned int cpu)
}

if (cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV) {
- cpufreq_cooling_unregister(policy->cdev);
+ cpufreq_cooling_unregister(policy);
policy->cdev = NULL;
}

diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 83486775e593..007c7c6bf845 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -78,6 +78,7 @@ struct cpufreq_cooling_device {
struct cpufreq_policy *policy;
struct list_head node;
struct time_in_idle *idle_time;
+ struct thermal_cooling_device *cdev;
};

static DEFINE_IDA(cpufreq_ida);
@@ -606,6 +607,7 @@ __cpufreq_cooling_register(struct device_node *np,
goto remove_ida;

cpufreq_cdev->clipped_freq = get_state_freq(cpufreq_cdev, 0);
+ cpufreq_cdev->cdev = cdev;

mutex_lock(&cooling_list_lock);
/* Register the notifier for first cpufreq cooling device */
@@ -699,18 +701,18 @@ EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register);
*
* This interface function unregisters the "thermal-cpufreq-%x" cooling device.
*/
-void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
+void cpufreq_cooling_unregister(struct cpufreq_policy *policy)
{
struct cpufreq_cooling_device *cpufreq_cdev;
bool last;

- if (!cdev)
- return;
-
- cpufreq_cdev = cdev->devdata;
-
mutex_lock(&cooling_list_lock);
- list_del(&cpufreq_cdev->node);
+ list_for_each_entry(cpufreq_cdev, &cpufreq_cdev_list, node) {
+ if (cpufreq_cdev->policy == policy) {
+ list_del(&cpufreq_cdev->node);
+ break;
+ }
+ }
/* Unregister the notifier for the last cpufreq cooling device */
last = list_empty(&cpufreq_cdev_list);
mutex_unlock(&cooling_list_lock);
@@ -719,7 +721,7 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);

- thermal_cooling_device_unregister(cdev);
+ thermal_cooling_device_unregister(cpufreq_cdev->cdev);
ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
kfree(cpufreq_cdev->idle_time);
kfree(cpufreq_cdev);
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index bb6754a5342c..6746f1b73eb7 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -680,7 +680,7 @@ static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)

static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
{
- cpufreq_cooling_unregister(data->cdev);
+ cpufreq_cooling_unregister(data->policy);
cpufreq_cpu_put(data->policy);
}

@@ -872,7 +872,7 @@ static int imx_thermal_remove(struct platform_device *pdev)
clk_disable_unprepare(data->thermal_clk);

thermal_zone_device_unregister(data->tz);
- cpufreq_cooling_unregister(data->cdev);
+ cpufreq_cooling_unregister(data->policy);
cpufreq_cpu_put(data->policy);

return 0;
diff --git a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
index b4f981daeaf2..217b1aae8b4f 100644
--- a/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
+++ b/drivers/thermal/ti-soc-thermal/ti-thermal-common.c
@@ -277,7 +277,7 @@ int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
data = ti_bandgap_get_sensor_data(bgp, id);

if (data) {
- cpufreq_cooling_unregister(data->cool_dev);
+ cpufreq_cooling_unregister(data->policy);
if (data->policy)
cpufreq_cpu_put(data->policy);
}
diff --git a/include/linux/cpu_cooling.h b/include/linux/cpu_cooling.h
index bae54bb7c048..89f469ee4be4 100644
--- a/include/linux/cpu_cooling.h
+++ b/include/linux/cpu_cooling.h
@@ -29,9 +29,9 @@ cpufreq_cooling_register(struct cpufreq_policy *policy);

/**
* cpufreq_cooling_unregister - function to remove cpufreq cooling device.
- * @cdev: thermal cooling device pointer.
+ * @policy: cpufreq policy
*/
-void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev);
+void cpufreq_cooling_unregister(struct cpufreq_policy *policy);

#else /* !CONFIG_CPU_THERMAL */
static inline struct thermal_cooling_device *
@@ -41,7 +41,7 @@ cpufreq_cooling_register(struct cpufreq_policy *policy)
}

static inline
-void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
+void cpufreq_cooling_unregister(struct cpufreq_policy *policy)
{
return;
}
--
2.17.1
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