diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq_ondemand.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 41 |
1 files changed, 21 insertions, 20 deletions
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index e69fd8dd1f1c..9ee9411f186f 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -27,6 +27,7 @@ #include <linux/jiffies.h> #include <linux/kernel_stat.h> #include <linux/percpu.h> +#include <linux/mutex.h> /* * dbs is used in this file as a shortform for demandbased switching @@ -70,7 +71,7 @@ static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info); static unsigned int dbs_enable; /* number of CPUs using this policy */ -static DECLARE_MUTEX (dbs_sem); +static DEFINE_MUTEX (dbs_mutex); static DECLARE_WORK (dbs_work, do_dbs_timer, NULL); struct dbs_tuners { @@ -136,9 +137,9 @@ static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused, if (input > MAX_SAMPLING_DOWN_FACTOR || input < 1) return -EINVAL; - down(&dbs_sem); + mutex_lock(&dbs_mutex); dbs_tuners_ins.sampling_down_factor = input; - up(&dbs_sem); + mutex_unlock(&dbs_mutex); return count; } @@ -150,14 +151,14 @@ static ssize_t store_sampling_rate(struct cpufreq_policy *unused, int ret; ret = sscanf (buf, "%u", &input); - down(&dbs_sem); + mutex_lock(&dbs_mutex); if (ret != 1 || input > MAX_SAMPLING_RATE || input < MIN_SAMPLING_RATE) { - up(&dbs_sem); + mutex_unlock(&dbs_mutex); return -EINVAL; } dbs_tuners_ins.sampling_rate = input; - up(&dbs_sem); + mutex_unlock(&dbs_mutex); return count; } @@ -169,15 +170,15 @@ static ssize_t store_up_threshold(struct cpufreq_policy *unused, int ret; ret = sscanf (buf, "%u", &input); - down(&dbs_sem); + mutex_lock(&dbs_mutex); if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || input < MIN_FREQUENCY_UP_THRESHOLD) { - up(&dbs_sem); + mutex_unlock(&dbs_mutex); return -EINVAL; } dbs_tuners_ins.up_threshold = input; - up(&dbs_sem); + mutex_unlock(&dbs_mutex); return count; } @@ -197,9 +198,9 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy, if ( input > 1 ) input = 1; - down(&dbs_sem); + mutex_lock(&dbs_mutex); if ( input == dbs_tuners_ins.ignore_nice ) { /* nothing to do */ - up(&dbs_sem); + mutex_unlock(&dbs_mutex); return count; } dbs_tuners_ins.ignore_nice = input; @@ -211,7 +212,7 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy, j_dbs_info->prev_cpu_idle_up = get_cpu_idle_time(j); j_dbs_info->prev_cpu_idle_down = j_dbs_info->prev_cpu_idle_up; } - up(&dbs_sem); + mutex_unlock(&dbs_mutex); return count; } @@ -356,12 +357,12 @@ static void dbs_check_cpu(int cpu) static void do_dbs_timer(void *data) { int i; - down(&dbs_sem); + mutex_lock(&dbs_mutex); for_each_online_cpu(i) dbs_check_cpu(i); schedule_delayed_work(&dbs_work, usecs_to_jiffies(dbs_tuners_ins.sampling_rate)); - up(&dbs_sem); + mutex_unlock(&dbs_mutex); } static inline void dbs_timer_init(void) @@ -399,7 +400,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, if (this_dbs_info->enable) /* Already enabled */ break; - down(&dbs_sem); + mutex_lock(&dbs_mutex); for_each_cpu_mask(j, policy->cpus) { struct cpu_dbs_info_s *j_dbs_info; j_dbs_info = &per_cpu(cpu_dbs_info, j); @@ -435,11 +436,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, dbs_timer_init(); } - up(&dbs_sem); + mutex_unlock(&dbs_mutex); break; case CPUFREQ_GOV_STOP: - down(&dbs_sem); + mutex_lock(&dbs_mutex); this_dbs_info->enable = 0; sysfs_remove_group(&policy->kobj, &dbs_attr_group); dbs_enable--; @@ -450,12 +451,12 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, if (dbs_enable == 0) dbs_timer_exit(); - up(&dbs_sem); + mutex_unlock(&dbs_mutex); break; case CPUFREQ_GOV_LIMITS: - down(&dbs_sem); + mutex_lock(&dbs_mutex); if (policy->max < this_dbs_info->cur_policy->cur) __cpufreq_driver_target( this_dbs_info->cur_policy, @@ -464,7 +465,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy, __cpufreq_driver_target( this_dbs_info->cur_policy, policy->min, CPUFREQ_RELATION_L); - up(&dbs_sem); + mutex_unlock(&dbs_mutex); break; } return 0; |