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path: root/drivers/cpufreq/cpufreq.c
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Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
-rw-r--r--drivers/cpufreq/cpufreq.c70
1 files changed, 41 insertions, 29 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 277a843a87a6..7a511479ae29 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/completion.h>
+#include <linux/mutex.h>
#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "cpufreq-core", msg)
@@ -55,7 +56,7 @@ static DECLARE_RWSEM (cpufreq_notifier_rwsem);
static LIST_HEAD(cpufreq_governor_list);
-static DECLARE_MUTEX (cpufreq_governor_sem);
+static DEFINE_MUTEX (cpufreq_governor_mutex);
struct cpufreq_policy * cpufreq_cpu_get(unsigned int cpu)
{
@@ -297,18 +298,18 @@ static int cpufreq_parse_governor (char *str_governor, unsigned int *policy,
return -EINVAL;
} else {
struct cpufreq_governor *t;
- down(&cpufreq_governor_sem);
+ mutex_lock(&cpufreq_governor_mutex);
if (!cpufreq_driver || !cpufreq_driver->target)
goto out;
list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
if (!strnicmp(str_governor,t->name,CPUFREQ_NAME_LEN)) {
*governor = t;
- up(&cpufreq_governor_sem);
+ mutex_unlock(&cpufreq_governor_mutex);
return 0;
}
}
out:
- up(&cpufreq_governor_sem);
+ mutex_unlock(&cpufreq_governor_mutex);
}
return -EINVAL;
}
@@ -600,7 +601,8 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
policy->cpu = cpu;
policy->cpus = cpumask_of_cpu(cpu);
- init_MUTEX_LOCKED(&policy->lock);
+ mutex_init(&policy->lock);
+ mutex_lock(&policy->lock);
init_completion(&policy->kobj_unregister);
INIT_WORK(&policy->update, handle_update, (void *)(long)cpu);
@@ -610,6 +612,7 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
ret = cpufreq_driver->init(policy);
if (ret) {
dprintk("initialization failed\n");
+ mutex_unlock(&policy->lock);
goto err_out;
}
@@ -621,9 +624,10 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
strlcpy(policy->kobj.name, "cpufreq", KOBJ_NAME_LEN);
ret = kobject_register(&policy->kobj);
- if (ret)
+ if (ret) {
+ mutex_unlock(&policy->lock);
goto err_out_driver_exit;
-
+ }
/* set up files for this cpu device */
drv_attr = cpufreq_driver->attr;
while ((drv_attr) && (*drv_attr)) {
@@ -641,7 +645,7 @@ static int cpufreq_add_dev (struct sys_device * sys_dev)
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
policy->governor = NULL; /* to assure that the starting sequence is
* run in cpufreq_set_policy */
- up(&policy->lock);
+ mutex_unlock(&policy->lock);
/* set default policy */
@@ -762,10 +766,10 @@ static int cpufreq_remove_dev (struct sys_device * sys_dev)
spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
#endif
- down(&data->lock);
+ mutex_lock(&data->lock);
if (cpufreq_driver->target)
__cpufreq_governor(data, CPUFREQ_GOV_STOP);
- up(&data->lock);
+ mutex_unlock(&data->lock);
kobject_unregister(&data->kobj);
@@ -834,9 +838,9 @@ unsigned int cpufreq_quick_get(unsigned int cpu)
unsigned int ret = 0;
if (policy) {
- down(&policy->lock);
+ mutex_lock(&policy->lock);
ret = policy->cur;
- up(&policy->lock);
+ mutex_unlock(&policy->lock);
cpufreq_cpu_put(policy);
}
@@ -862,7 +866,7 @@ unsigned int cpufreq_get(unsigned int cpu)
if (!cpufreq_driver->get)
goto out;
- down(&policy->lock);
+ mutex_lock(&policy->lock);
ret = cpufreq_driver->get(cpu);
@@ -875,7 +879,7 @@ unsigned int cpufreq_get(unsigned int cpu)
}
}
- up(&policy->lock);
+ mutex_unlock(&policy->lock);
out:
cpufreq_cpu_put(policy);
@@ -1158,11 +1162,11 @@ int cpufreq_driver_target(struct cpufreq_policy *policy,
if (!policy)
return -EINVAL;
- down(&policy->lock);
+ mutex_lock(&policy->lock);
ret = __cpufreq_driver_target(policy, target_freq, relation);
- up(&policy->lock);
+ mutex_unlock(&policy->lock);
cpufreq_cpu_put(policy);
@@ -1199,9 +1203,9 @@ int cpufreq_governor(unsigned int cpu, unsigned int event)
if (!policy)
return -EINVAL;
- down(&policy->lock);
+ mutex_lock(&policy->lock);
ret = __cpufreq_governor(policy, event);
- up(&policy->lock);
+ mutex_unlock(&policy->lock);
cpufreq_cpu_put(policy);
@@ -1217,17 +1221,17 @@ int cpufreq_register_governor(struct cpufreq_governor *governor)
if (!governor)
return -EINVAL;
- down(&cpufreq_governor_sem);
+ mutex_lock(&cpufreq_governor_mutex);
list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
if (!strnicmp(governor->name,t->name,CPUFREQ_NAME_LEN)) {
- up(&cpufreq_governor_sem);
+ mutex_unlock(&cpufreq_governor_mutex);
return -EBUSY;
}
}
list_add(&governor->governor_list, &cpufreq_governor_list);
- up(&cpufreq_governor_sem);
+ mutex_unlock(&cpufreq_governor_mutex);
return 0;
}
@@ -1239,9 +1243,9 @@ void cpufreq_unregister_governor(struct cpufreq_governor *governor)
if (!governor)
return;
- down(&cpufreq_governor_sem);
+ mutex_lock(&cpufreq_governor_mutex);
list_del(&governor->governor_list);
- up(&cpufreq_governor_sem);
+ mutex_unlock(&cpufreq_governor_mutex);
return;
}
EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
@@ -1268,9 +1272,9 @@ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
if (!cpu_policy)
return -EINVAL;
- down(&cpu_policy->lock);
+ mutex_lock(&cpu_policy->lock);
memcpy(policy, cpu_policy, sizeof(struct cpufreq_policy));
- up(&cpu_policy->lock);
+ mutex_unlock(&cpu_policy->lock);
cpufreq_cpu_put(cpu_policy);
@@ -1382,7 +1386,7 @@ int cpufreq_set_policy(struct cpufreq_policy *policy)
return -EINVAL;
/* lock this CPU */
- down(&data->lock);
+ mutex_lock(&data->lock);
ret = __cpufreq_set_policy(data, policy);
data->user_policy.min = data->min;
@@ -1390,7 +1394,7 @@ int cpufreq_set_policy(struct cpufreq_policy *policy)
data->user_policy.policy = data->policy;
data->user_policy.governor = data->governor;
- up(&data->lock);
+ mutex_unlock(&data->lock);
cpufreq_cpu_put(data);
return ret;
@@ -1414,7 +1418,7 @@ int cpufreq_update_policy(unsigned int cpu)
if (!data)
return -ENODEV;
- down(&data->lock);
+ mutex_lock(&data->lock);
dprintk("updating policy for CPU %u\n", cpu);
memcpy(&policy,
@@ -1425,9 +1429,17 @@ int cpufreq_update_policy(unsigned int cpu)
policy.policy = data->user_policy.policy;
policy.governor = data->user_policy.governor;
+ /* BIOS might change freq behind our back
+ -> ask driver for current freq and notify governors about a change */
+ if (cpufreq_driver->get) {
+ policy.cur = cpufreq_driver->get(cpu);
+ if (data->cur != policy.cur)
+ cpufreq_out_of_sync(cpu, data->cur, policy.cur);
+ }
+
ret = __cpufreq_set_policy(data, &policy);
- up(&data->lock);
+ mutex_unlock(&data->lock);
cpufreq_cpu_put(data);
return ret;