diff options
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 10 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 1 |
2 files changed, 9 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 398882939cb..17267a4b459 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1635,12 +1635,15 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, policy->cpu, event); mutex_lock(&cpufreq_governor_lock); - if ((!policy->governor_enabled && (event == CPUFREQ_GOV_STOP)) || - (policy->governor_enabled && (event == CPUFREQ_GOV_START))) { + if (policy->governor_busy + || (policy->governor_enabled && event == CPUFREQ_GOV_START) + || (!policy->governor_enabled + && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) { mutex_unlock(&cpufreq_governor_lock); return -EBUSY; } + policy->governor_busy = true; if (event == CPUFREQ_GOV_STOP) policy->governor_enabled = false; else if (event == CPUFREQ_GOV_START) @@ -1672,6 +1675,9 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, if ((event == CPUFREQ_GOV_STOP) && !ret) module_put(policy->governor->owner); + mutex_lock(&cpufreq_governor_lock); + policy->governor_busy = false; + mutex_unlock(&cpufreq_governor_lock); return ret; } diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index bd1ad374076..940f1fed44f 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -112,6 +112,7 @@ struct cpufreq_policy { struct cpufreq_governor *governor; /* see below */ void *governor_data; bool governor_enabled; /* governor start/stop flag */ + bool governor_busy; struct work_struct update; /* if update_policy() needs to be * called, but you're in IRQ context */ |