diff options
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 57 |
1 files changed, 34 insertions, 23 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index ad996c772c8b..9b416372a8e4 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -284,39 +284,52 @@ EXPORT_SYMBOL_GPL(cpufreq_notify_transition); * SYSFS INTERFACE * *********************************************************************/ +static struct cpufreq_governor *__find_governor(const char *str_governor) +{ + struct cpufreq_governor *t; + + list_for_each_entry(t, &cpufreq_governor_list, governor_list) + if (!strnicmp(str_governor,t->name,CPUFREQ_NAME_LEN)) + return t; + + return NULL; +} + /** * cpufreq_parse_governor - parse a governor string */ static int cpufreq_parse_governor (char *str_governor, unsigned int *policy, struct cpufreq_governor **governor) { + int err = -EINVAL; + if (!cpufreq_driver) - return -EINVAL; + goto out; + if (cpufreq_driver->setpolicy) { if (!strnicmp(str_governor, "performance", CPUFREQ_NAME_LEN)) { *policy = CPUFREQ_POLICY_PERFORMANCE; - return 0; + err = 0; } else if (!strnicmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) { *policy = CPUFREQ_POLICY_POWERSAVE; - return 0; + err = 0; } - return -EINVAL; - } else { + } else if (cpufreq_driver->target) { struct cpufreq_governor *t; + 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; - mutex_unlock(&cpufreq_governor_mutex); - return 0; - } + + t = __find_governor(str_governor); + + if (t != NULL) { + *governor = t; + err = 0; } -out: + mutex_unlock(&cpufreq_governor_mutex); } - return -EINVAL; + out: + return err; } @@ -1265,23 +1278,21 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event) int cpufreq_register_governor(struct cpufreq_governor *governor) { - struct cpufreq_governor *t; + int err; if (!governor) return -EINVAL; mutex_lock(&cpufreq_governor_mutex); - list_for_each_entry(t, &cpufreq_governor_list, governor_list) { - if (!strnicmp(governor->name,t->name,CPUFREQ_NAME_LEN)) { - mutex_unlock(&cpufreq_governor_mutex); - return -EBUSY; - } + err = -EBUSY; + if (__find_governor(governor->name) == NULL) { + err = 0; + list_add(&governor->governor_list, &cpufreq_governor_list); } - list_add(&governor->governor_list, &cpufreq_governor_list); mutex_unlock(&cpufreq_governor_mutex); - return 0; + return err; } EXPORT_SYMBOL_GPL(cpufreq_register_governor); |