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-rw-r--r--drivers/cpufreq/cpufreq.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 34999fc..cf01658 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;
}
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