*/
int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq)
{
- struct srcu_notifier_head *nh = opp_get_notifier(dev);
+ struct srcu_notifier_head *nh;
+ int ret = 0;
+ rcu_read_lock();
+ nh = opp_get_notifier(dev);
if (IS_ERR(nh))
- return PTR_ERR(nh);
- return srcu_notifier_chain_register(nh, &devfreq->nb);
+ ret = PTR_ERR(nh);
+ rcu_read_unlock();
+ if (!ret)
+ ret = srcu_notifier_chain_register(nh, &devfreq->nb);
+
+ return ret;
}
/**
*/
int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq)
{
- struct srcu_notifier_head *nh = opp_get_notifier(dev);
+ struct srcu_notifier_head *nh;
+ int ret = 0;
+ rcu_read_lock();
+ nh = opp_get_notifier(dev);
if (IS_ERR(nh))
- return PTR_ERR(nh);
- return srcu_notifier_chain_unregister(nh, &devfreq->nb);
+ ret = PTR_ERR(nh);
+ rcu_read_unlock();
+ if (!ret)
+ ret = srcu_notifier_chain_unregister(nh, &devfreq->nb);
+
+ return ret;
}
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");