diff options
Diffstat (limited to 'drivers/cpufreq/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 277a843a87a..eb2f19d00e9 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; } @@ -1217,17 +1218,17 @@ 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 +1240,9 @@ 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); |