PM / OPP: Don't expose srcu_head to register notifiers

Let the OPP core provide helpers to register notifiers for any device,
instead of exposing srcu_head outside of the core.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 2 insertions, 24 deletions

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 47206a21bb90..a545c0fee6e1 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1265,18 +1265,7 @@ EXPORT_SYMBOL(devfreq_recommended_opp);
  */
 int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq)
 {
-        struct srcu_notifier_head *nh;
-        int ret = 0;
-
-        rcu_read_lock();
-        nh = dev_pm_opp_get_notifier(dev);
-        if (IS_ERR(nh))
-                ret = PTR_ERR(nh);
-        rcu_read_unlock();
-        if (!ret)
-                ret = srcu_notifier_chain_register(nh, &devfreq->nb);
-
-        return ret;
+        return dev_pm_opp_register_notifier(dev, &devfreq->nb);
 }
 EXPORT_SYMBOL(devfreq_register_opp_notifier);
 
@@ -1292,18 +1281,7 @@ EXPORT_SYMBOL(devfreq_register_opp_notifier);
  */
 int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq)
 {
-        struct srcu_notifier_head *nh;
-        int ret = 0;
-
-        rcu_read_lock();
-        nh = dev_pm_opp_get_notifier(dev);
-        if (IS_ERR(nh))
-                ret = PTR_ERR(nh);
-        rcu_read_unlock();
-        if (!ret)
-                ret = srcu_notifier_chain_unregister(nh, &devfreq->nb);
-
-        return ret;
+        return dev_pm_opp_unregister_notifier(dev, &devfreq->nb);
 }
 EXPORT_SYMBOL(devfreq_unregister_opp_notifier);