diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 40 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_conservative.c | 2 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 4 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_userspace.c | 3 |
4 files changed, 23 insertions, 26 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 8d328186f77..bc1088d9b37 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -364,10 +364,12 @@ static ssize_t store_##file_name \ if (ret != 1) \ return -EINVAL; \ \ + lock_cpu_hotplug(); \ mutex_lock(&policy->lock); \ ret = __cpufreq_set_policy(policy, &new_policy); \ policy->user_policy.object = policy->object; \ mutex_unlock(&policy->lock); \ + unlock_cpu_hotplug(); \ \ return ret ? ret : count; \ } @@ -1197,20 +1199,18 @@ EXPORT_SYMBOL(cpufreq_unregister_notifier); *********************************************************************/ +/* Must be called with lock_cpu_hotplug held */ int __cpufreq_driver_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation) { int retval = -EINVAL; - lock_cpu_hotplug(); dprintk("target for CPU %u: %u kHz, relation %u\n", policy->cpu, target_freq, relation); if (cpu_online(policy->cpu) && cpufreq_driver->target) retval = cpufreq_driver->target(policy, target_freq, relation); - unlock_cpu_hotplug(); - return retval; } EXPORT_SYMBOL_GPL(__cpufreq_driver_target); @@ -1225,17 +1225,23 @@ int cpufreq_driver_target(struct cpufreq_policy *policy, if (!policy) return -EINVAL; + lock_cpu_hotplug(); mutex_lock(&policy->lock); ret = __cpufreq_driver_target(policy, target_freq, relation); mutex_unlock(&policy->lock); + unlock_cpu_hotplug(); cpufreq_cpu_put(policy); return ret; } EXPORT_SYMBOL_GPL(cpufreq_driver_target); +/* + * Locking: Must be called with the lock_cpu_hotplug() lock held + * when "event" is CPUFREQ_GOV_LIMITS + */ static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event) { @@ -1257,24 +1263,6 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event) } -int cpufreq_governor(unsigned int cpu, unsigned int event) -{ - int ret = 0; - struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); - - if (!policy) - return -EINVAL; - - mutex_lock(&policy->lock); - ret = __cpufreq_governor(policy, event); - mutex_unlock(&policy->lock); - - cpufreq_cpu_put(policy); - return ret; -} -EXPORT_SYMBOL_GPL(cpufreq_governor); - - int cpufreq_register_governor(struct cpufreq_governor *governor) { struct cpufreq_governor *t; @@ -1342,6 +1330,9 @@ int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) EXPORT_SYMBOL(cpufreq_get_policy); +/* + * Locking: Must be called with the lock_cpu_hotplug() lock held + */ static int __cpufreq_set_policy(struct cpufreq_policy *data, struct cpufreq_policy *policy) { int ret = 0; @@ -1436,6 +1427,8 @@ int cpufreq_set_policy(struct cpufreq_policy *policy) if (!data) return -EINVAL; + lock_cpu_hotplug(); + /* lock this CPU */ mutex_lock(&data->lock); @@ -1446,6 +1439,8 @@ int cpufreq_set_policy(struct cpufreq_policy *policy) data->user_policy.governor = data->governor; mutex_unlock(&data->lock); + + unlock_cpu_hotplug(); cpufreq_cpu_put(data); return ret; @@ -1469,6 +1464,7 @@ int cpufreq_update_policy(unsigned int cpu) if (!data) return -ENODEV; + lock_cpu_hotplug(); mutex_lock(&data->lock); dprintk("updating policy for CPU %u\n", cpu); @@ -1494,7 +1490,7 @@ int cpufreq_update_policy(unsigned int cpu) ret = __cpufreq_set_policy(data, &policy); mutex_unlock(&data->lock); - + unlock_cpu_hotplug(); cpufreq_cpu_put(data); return ret; } diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index b3ebc8f0197..c4c578defab 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -525,7 +525,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, break; case CPUFREQ_GOV_LIMITS: - lock_cpu_hotplug(); mutex_lock(&dbs_mutex); if (policy->max < this_dbs_info->cur_policy->cur) __cpufreq_driver_target( @@ -536,7 +535,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, this_dbs_info->cur_policy, policy->min, CPUFREQ_RELATION_L); mutex_unlock(&dbs_mutex); - unlock_cpu_hotplug(); break; } return 0; diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 178f0c547eb..52cf1f02182 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -309,7 +309,9 @@ static void do_dbs_timer(void *data) if (!dbs_info->enable) return; + lock_cpu_hotplug(); dbs_check_cpu(dbs_info); + unlock_cpu_hotplug(); queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, usecs_to_jiffies(dbs_tuners_ins.sampling_rate)); } @@ -412,7 +414,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, break; case CPUFREQ_GOV_LIMITS: - lock_cpu_hotplug(); mutex_lock(&dbs_mutex); if (policy->max < this_dbs_info->cur_policy->cur) __cpufreq_driver_target(this_dbs_info->cur_policy, @@ -423,7 +424,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, policy->min, CPUFREQ_RELATION_L); mutex_unlock(&dbs_mutex); - unlock_cpu_hotplug(); break; } return 0; diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c index 44ae5e5b94c..a06c204589c 100644 --- a/drivers/cpufreq/cpufreq_userspace.c +++ b/drivers/cpufreq/cpufreq_userspace.c @@ -18,6 +18,7 @@ #include <linux/spinlock.h> #include <linux/interrupt.h> #include <linux/cpufreq.h> +#include <linux/cpu.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/sysfs.h> @@ -70,6 +71,7 @@ static int cpufreq_set(unsigned int freq, struct cpufreq_policy *policy) dprintk("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq); + lock_cpu_hotplug(); mutex_lock(&userspace_mutex); if (!cpu_is_managed[policy->cpu]) goto err; @@ -92,6 +94,7 @@ static int cpufreq_set(unsigned int freq, struct cpufreq_policy *policy) err: mutex_unlock(&userspace_mutex); + unlock_cpu_hotplug(); return ret; } |