linux-kernel - [PATCH 4.9 042/101] reset: make device_reset

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Date:   Thu,  6 Dec 2018 15:38:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Dinh Nguyen <dinguyen@...nel.org>
Subject: [PATCH 4.9 042/101] reset: make device_reset_optional() really optional

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Masahiro Yamada <yamada.masahiro@...ionext.com>

commit 1554bbd4ad401b7f0f916c0891874111c10befe5 upstream.

Commit bb475230b8e5 ("reset: make optional functions really optional")
converted *_get_optional* functions, but device_reset_optional() was
left behind.  Convert it in the same way.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Dinh Nguyen <dinguyen@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>


---
 drivers/reset/core.c  |    9 +++++----
 include/linux/reset.h |   28 +++++++++++++---------------
 2 files changed, 18 insertions(+), 19 deletions(-)

--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -410,17 +410,18 @@ EXPORT_SYMBOL_GPL(__devm_reset_control_g
  * device_reset - find reset controller associated with the device
  *                and perform reset
  * @dev: device to be reset by the controller
+ * @optional: whether it is optional to reset the device
  *
- * Convenience wrapper for reset_control_get() and reset_control_reset().
+ * Convenience wrapper for __reset_control_get() and reset_control_reset().
  * This is useful for the common case of devices with single, dedicated reset
  * lines.
  */
-int device_reset(struct device *dev)
+int __device_reset(struct device *dev, bool optional)
 {
 	struct reset_control *rstc;
 	int ret;
 
-	rstc = reset_control_get(dev, NULL);
+	rstc = __reset_control_get(dev, NULL, 0, 0, optional);
 	if (IS_ERR(rstc))
 		return PTR_ERR(rstc);
 
@@ -430,4 +431,4 @@ int device_reset(struct device *dev)
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(device_reset);
+EXPORT_SYMBOL_GPL(__device_reset);
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -19,17 +19,11 @@ struct reset_control *__reset_control_ge
 					  int index, bool shared,
 					  bool optional);
 void reset_control_put(struct reset_control *rstc);
+int __device_reset(struct device *dev, bool optional);
 struct reset_control *__devm_reset_control_get(struct device *dev,
 				     const char *id, int index, bool shared,
 				     bool optional);
 
-int __must_check device_reset(struct device *dev);
-
-static inline int device_reset_optional(struct device *dev)
-{
-	return device_reset(dev);
-}
-
 #else
 
 static inline int reset_control_reset(struct reset_control *rstc)
@@ -56,15 +50,9 @@ static inline void reset_control_put(str
 {
 }
 
-static inline int __must_check device_reset(struct device *dev)
-{
-	WARN_ON(1);
-	return -ENOTSUPP;
-}
-
-static inline int device_reset_optional(struct device *dev)
+static inline int __device_reset(struct device *dev, bool optional)
 {
-	return -ENOTSUPP;
+	return optional ? 0 : -ENOTSUPP;
 }
 
 static inline struct reset_control *__of_reset_control_get(
@@ -91,6 +79,16 @@ static inline struct reset_control *__de
 
 #endif /* CONFIG_RESET_CONTROLLER */
 
+static inline int __must_check device_reset(struct device *dev)
+{
+	return __device_reset(dev, false);
+}
+
+static inline int device_reset_optional(struct device *dev)
+{
+	return __device_reset(dev, true);
+}
+
 /**
  * reset_control_get_exclusive - Lookup and obtain an exclusive reference
  *                               to a reset controller.