[PATCH 31/31] PM / devfreq: convert to devm_pm_opp_register_notifier and remove unused API

[Yangtao Li <tiny.windzz@gmail.com>]

 Use devm_pm_opp_* API to simplify code.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
 drivers/devfreq/devfreq.c | 66 +--------------------------------------
 include/linux/devfreq.h   | 23 --------------
 2 files changed, 1 insertion(+), 88 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 6aa10de792b3..f593f30529ec 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -2004,40 +2004,6 @@ struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
 }
 EXPORT_SYMBOL(devfreq_recommended_opp);
 
-/**
- * devfreq_register_opp_notifier() - Helper function to get devfreq notified
- *				     for any changes in the OPP availability
- *				     changes
- * @dev:	The devfreq user device. (parent of devfreq)
- * @devfreq:	The devfreq object.
- */
-int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq)
-{
-	return dev_pm_opp_register_notifier(dev, &devfreq->nb);
-}
-EXPORT_SYMBOL(devfreq_register_opp_notifier);
-
-/**
- * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq
- *				       notified for any changes in the OPP
- *				       availability changes anymore.
- * @dev:	The devfreq user device. (parent of devfreq)
- * @devfreq:	The devfreq object.
- *
- * At exit() callback of devfreq_dev_profile, this must be included if
- * devfreq_recommended_opp is used.
- */
-int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq)
-{
-	return dev_pm_opp_unregister_notifier(dev, &devfreq->nb);
-}
-EXPORT_SYMBOL(devfreq_unregister_opp_notifier);
-
-static void devm_devfreq_opp_release(struct device *dev, void *res)
-{
-	devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res);
-}
-
 /**
  * devm_devfreq_register_opp_notifier() - Resource-managed
  *					  devfreq_register_opp_notifier()
@@ -2047,40 +2013,10 @@ static void devm_devfreq_opp_release(struct device *dev, void *res)
 int devm_devfreq_register_opp_notifier(struct device *dev,
 				       struct devfreq *devfreq)
 {
-	struct devfreq **ptr;
-	int ret;
-
-	ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return -ENOMEM;
-
-	ret = devfreq_register_opp_notifier(dev, devfreq);
-	if (ret) {
-		devres_free(ptr);
-		return ret;
-	}
-
-	*ptr = devfreq;
-	devres_add(dev, ptr);
-
-	return 0;
+	return devm_pm_opp_register_notifier(dev, &devfreq->nb);
 }
 EXPORT_SYMBOL(devm_devfreq_register_opp_notifier);
 
-/**
- * devm_devfreq_unregister_opp_notifier() - Resource-managed
- *					    devfreq_unregister_opp_notifier()
- * @dev:	The devfreq user device. (parent of devfreq)
- * @devfreq:	The devfreq object.
- */
-void devm_devfreq_unregister_opp_notifier(struct device *dev,
-					 struct devfreq *devfreq)
-{
-	WARN_ON(devres_release(dev, devm_devfreq_opp_release,
-			       devm_devfreq_dev_match, devfreq));
-}
-EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);
-
 /**
  * devfreq_register_notifier() - Register a driver with devfreq
  * @devfreq:	The devfreq object.
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index b6d3bae1c74d..aca2cc4f4fa4 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -230,14 +230,8 @@ int update_devfreq(struct devfreq *devfreq);
 /* Helper functions for devfreq user device driver with OPP. */
 struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
 				unsigned long *freq, u32 flags);
-int devfreq_register_opp_notifier(struct device *dev,
-				struct devfreq *devfreq);
-int devfreq_unregister_opp_notifier(struct device *dev,
-				struct devfreq *devfreq);
 int devm_devfreq_register_opp_notifier(struct device *dev,
 				struct devfreq *devfreq);
-void devm_devfreq_unregister_opp_notifier(struct device *dev,
-				struct devfreq *devfreq);
 int devfreq_register_notifier(struct devfreq *devfreq,
 				struct notifier_block *nb,
 				unsigned int list);
@@ -355,29 +349,12 @@ static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
 	return ERR_PTR(-EINVAL);
 }
 
-static inline int devfreq_register_opp_notifier(struct device *dev,
-					struct devfreq *devfreq)
-{
-	return -EINVAL;
-}
-
-static inline int devfreq_unregister_opp_notifier(struct device *dev,
-					struct devfreq *devfreq)
-{
-	return -EINVAL;
-}
-
 static inline int devm_devfreq_register_opp_notifier(struct device *dev,
 					struct devfreq *devfreq)
 {
 	return -EINVAL;
 }
 
-static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,
-					struct devfreq *devfreq)
-{
-}
-
 static inline int devfreq_register_notifier(struct devfreq *devfreq,
 					struct notifier_block *nb,
 					unsigned int list)
-- 
2.25.1