linux-kernel - [PATCH 4.9 30/31] of: Support const and non-const use for to_of

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Message-Id: <20190318084211.641869720@linuxfoundation.org>
Date:   Mon, 18 Mar 2019 10:26:05 +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,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Rob Herring <robh@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH 4.9 30/31] of: Support const and non-const use for to_of_node()

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

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

From: Sakari Ailus <sakari.ailus@...ux.intel.com>

commit d20dc1493db438fbbfb7733adc82f472dd8a0789 upstream.

Turn to_of_node() into a macro in order to support both const and
non-const use. Additionally make the fwnode argument to is_of_node() const
as well.

Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Signed-off-by: Rob Herring <robh@...nel.org>
Cc: Nathan Chancellor <natechancellor@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/linux/of.h |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -148,16 +148,20 @@ extern raw_spinlock_t devtree_lock;
 #ifdef CONFIG_OF
 void of_core_init(void);
 
-static inline bool is_of_node(struct fwnode_handle *fwnode)
+static inline bool is_of_node(const struct fwnode_handle *fwnode)
 {
 	return !IS_ERR_OR_NULL(fwnode) && fwnode->type == FWNODE_OF;
 }
 
-static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)
-{
-	return is_of_node(fwnode) ?
-		container_of(fwnode, struct device_node, fwnode) : NULL;
-}
+#define to_of_node(__fwnode)						\
+	({								\
+		typeof(__fwnode) __to_of_node_fwnode = (__fwnode);	\
+									\
+		is_of_node(__to_of_node_fwnode) ?			\
+			container_of(__to_of_node_fwnode,		\
+				     struct device_node, fwnode) :	\
+			NULL;						\
+	})
 
 static inline bool of_have_populated_dt(void)
 {
@@ -529,12 +533,12 @@ static inline void of_core_init(void)
 {
 }
 
-static inline bool is_of_node(struct fwnode_handle *fwnode)
+static inline bool is_of_node(const struct fwnode_handle *fwnode)
 {
 	return false;
 }
 
-static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)
+static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
 {
 	return NULL;
 }