diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 34999fc3216..cf016584b4a 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -694,8 +694,13 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr, struct freq_attr *fattr = to_attr(attr); ssize_t ret = -EINVAL; + get_online_cpus(); + + if (!cpu_online(policy->cpu)) + goto unlock; + if (!down_read_trylock(&cpufreq_rwsem)) - goto exit; + goto unlock; if (lock_policy_rwsem_write(policy->cpu) < 0) goto up_read; @@ -709,7 +714,9 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr, up_read: up_read(&cpufreq_rwsem); -exit: +unlock: + put_online_cpus(); + return ret; } |