From: "hongbo.zhang" <hongbo.zh...@linaro.com>
Problem of using this list is that the cpufreq_get_max_state callback will be
called when register cooling device by thermal_cooling_device_register, but
this list isn't ready at this moment. What's more, there is no need to maintain
such a list, we can get cpufreq_cooling_device instance by the private
thermal_cooling_device.devdata.
Signed-off-by: hongbo.zhang <hongbo.zh...@linaro.com>
---
drivers/thermal/cpu_cooling.c | 81 +++++++++----------------------------------
1 file changed, 16 insertions(+), 65 deletions(-)
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 415b041..cc80d29 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -58,8 +58,9 @@ struct cpufreq_cooling_device {
};
static LIST_HEAD(cooling_cpufreq_list);
static DEFINE_IDR(cpufreq_idr);
+static DEFINE_MUTEX(cooling_cpufreq_lock);
-static struct mutex cooling_cpufreq_lock;
+static unsigned int cpufreq_dev_count;
/* notify_table passes value to the CPUFREQ_ADJUST callback function. */
#define NOTIFY_INVALID NULL
@@ -241,20 +242,12 @@ static int cpufreq_get_max_state(struct
thermal_cooling_device *cdev,
unsigned long *state)
{
int ret = -EINVAL, i = 0;
- struct cpufreq_cooling_device *cpufreq_device;
+ struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
struct cpumask *maskPtr;
unsigned int cpu;
struct cpufreq_frequency_table *table;
unsigned long count = 0;
- mutex_lock(&cooling_cpufreq_lock);
- list_for_each_entry(cpufreq_device, &cooling_cpufreq_list, node) {
- if (cpufreq_device && cpufreq_device->cool_dev == cdev)
- break;
- }
- if (cpufreq_device == NULL)
- goto return_get_max_state;
-
maskPtr = &cpufreq_device->allowed_cpus;
cpu = cpumask_any(maskPtr);
table = cpufreq_frequency_get_table(cpu);
@@ -276,7 +269,6 @@ static int cpufreq_get_max_state(struct
thermal_cooling_device *cdev,
}
return_get_max_state:
- mutex_unlock(&cooling_cpufreq_lock);
return ret;
}
@@ -288,20 +280,10 @@ return_get_max_state:
static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
- int ret = -EINVAL;
- struct cpufreq_cooling_device *cpufreq_device;
-
- mutex_lock(&cooling_cpufreq_lock);
- list_for_each_entry(cpufreq_device, &cooling_cpufreq_list, node) {
- if (cpufreq_device && cpufreq_device->cool_dev == cdev) {
- *state = cpufreq_device->cpufreq_state;
- ret = 0;
- break;
- }
- }
- mutex_unlock(&cooling_cpufreq_lock);
+ struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
- return ret;
+ *state = cpufreq_device->cpufreq_state;
+ return 0;
}
/**
@@ -312,22 +294,9 @@ static int cpufreq_get_cur_state(struct
thermal_cooling_device *cdev,
static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long state)
{
- int ret = -EINVAL;
- struct cpufreq_cooling_device *cpufreq_device;
-
- mutex_lock(&cooling_cpufreq_lock);
- list_for_each_entry(cpufreq_device, &cooling_cpufreq_list, node) {
- if (cpufreq_device && cpufreq_device->cool_dev == cdev) {
- ret = 0;
- break;
- }
- }
- if (!ret)
- ret = cpufreq_apply_cooling(cpufreq_device, state);
+ struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
- mutex_unlock(&cooling_cpufreq_lock);
-
- return ret;
+ return cpufreq_apply_cooling(cpufreq_device, state);
}
/* Bind cpufreq callbacks to thermal cooling device ops */
@@ -351,7 +320,7 @@ struct thermal_cooling_device *cpufreq_cooling_register(
{
struct thermal_cooling_device *cool_dev;
struct cpufreq_cooling_device *cpufreq_dev = NULL;
- unsigned int cpufreq_dev_count = 0, min = 0, max = 0;
+ unsigned int min = 0, max = 0;
char dev_name[THERMAL_NAME_LENGTH];
int ret = 0, i;
struct cpufreq_policy policy;
@@ -360,9 +329,6 @@ struct thermal_cooling_device *cpufreq_cooling_register(
if (!cpufreq_frequency_get_table(cpumask_any(clip_cpus)))
return ERR_PTR(-EPROBE_DEFER);
- list_for_each_entry(cpufreq_dev, &cooling_cpufreq_list, node)
- cpufreq_dev_count++;
-
/*Verify that all the clip cpus have same freq_min, freq_max limit*/
for_each_cpu(i, clip_cpus) {
/*continue if cpufreq policy not found and not return error*/
@@ -384,9 +350,6 @@ struct thermal_cooling_device *cpufreq_cooling_register(
cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus);
- if (cpufreq_dev_count == 0)
- mutex_init(&cooling_cpufreq_lock);
-
ret = get_idr(&cpufreq_idr, &cpufreq_dev->id);
if (ret) {
kfree(cpufreq_dev);
@@ -405,12 +368,12 @@ struct thermal_cooling_device *cpufreq_cooling_register(
cpufreq_dev->cool_dev = cool_dev;
cpufreq_dev->cpufreq_state = 0;
mutex_lock(&cooling_cpufreq_lock);
- list_add_tail(&cpufreq_dev->node, &cooling_cpufreq_list);
/* Register the notifier for first cpufreq cooling device */
if (cpufreq_dev_count == 0)
cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
+ cpufreq_dev_count++;
mutex_unlock(&cooling_cpufreq_lock);
return cool_dev;
@@ -423,33 +386,21 @@ EXPORT_SYMBOL(cpufreq_cooling_register);
*/
void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
{
- struct cpufreq_cooling_device *cpufreq_dev = NULL;
- unsigned int cpufreq_dev_count = 0;
+ struct cpufreq_cooling_device *cpufreq_dev = cdev->devdata;
- mutex_lock(&cooling_cpufreq_lock);
- list_for_each_entry(cpufreq_dev, &cooling_cpufreq_list, node) {
- if (cpufreq_dev && cpufreq_dev->cool_dev == cdev)
- break;
- cpufreq_dev_count++;
- }
-
- if (!cpufreq_dev || cpufreq_dev->cool_dev != cdev) {
- mutex_unlock(&cooling_cpufreq_lock);
- return;
- }
+ thermal_cooling_device_unregister(cpufreq_dev->cool_dev);
- list_del(&cpufreq_dev->node);
+ mutex_lock(&cooling_cpufreq_lock);
+ cpufreq_dev_count--;
/* Unregister the notifier for the last cpufreq cooling device */
- if (cpufreq_dev_count == 1) {
+ if (cpufreq_dev_count == 0) {
cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
}
mutex_unlock(&cooling_cpufreq_lock);
- thermal_cooling_device_unregister(cpufreq_dev->cool_dev);
+
release_idr(&cpufreq_idr, cpufreq_dev->id);
- if (cpufreq_dev_count == 1)
- mutex_destroy(&cooling_cpufreq_lock);
kfree(cpufreq_dev);
}
EXPORT_SYMBOL(cpufreq_cooling_unregister);
--
1.7.11.3
--
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