Consolidate of_get_parent

This requires creating dummy of_node_{get,put} routines for sparc and
sparc64.  It also adds a read_lock around the parent accesses.
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Acked-by: NPaul Mackerras <paulus@samba.org>
Acked-by: NDavid S. Miller <davem@davemloft.net>

arch/powerpc/kernel/prom.c

@@ -1240,27 +1240,6 @@ struct device_node *of_find_all_nodes(struct device_node *prev)
 }
 EXPORT_SYMBOL(of_find_all_nodes);
 
-/**
- *	of_get_parent - Get a node's parent if any
- *	@node:	Node to get parent
- *
- *	Returns a node pointer with refcount incremented, use
- *	of_node_put() on it when done.
- */
-struct device_node *of_get_parent(const struct device_node *node)
-{
-	struct device_node *np;
-
-	if (!node)
-		return NULL;
-
-	read_lock(&devtree_lock);
-	np = of_node_get(node->parent);
-	read_unlock(&devtree_lock);
-	return np;
-}
-EXPORT_SYMBOL(of_get_parent);
-
 /**
  *	of_get_next_child - Iterate a node childs
  *	@node:	parent node

arch/sparc/kernel/prom.c

@@ -29,19 +29,6 @@ static struct device_node *allnodes;
 
 extern rwlock_t devtree_lock;	/* temporary while merging */
 
-struct device_node *of_get_parent(const struct device_node *node)
-{
-	struct device_node *np;
-
-	if (!node)
-		return NULL;
-
-	np = node->parent;
-
-	return np;
-}
-EXPORT_SYMBOL(of_get_parent);
-
 struct device_node *of_get_next_child(const struct device_node *node,
 	struct device_node *prev)
 {

arch/sparc64/kernel/prom.c

@@ -34,19 +34,6 @@ static struct device_node *allnodes;
 
 extern rwlock_t devtree_lock;	/* temporary while merging */
 
-struct device_node *of_get_parent(const struct device_node *node)
-{
-	struct device_node *np;
-
-	if (!node)
-		return NULL;
-
-	np = node->parent;
-
-	return np;
-}
-EXPORT_SYMBOL(of_get_parent);
-
 struct device_node *of_get_next_child(const struct device_node *node,
 	struct device_node *prev)
 {

drivers/of/base.c

@@ -113,3 +113,24 @@ int of_device_is_compatible(const struct device_node *device,
 	return 0;
 }
 EXPORT_SYMBOL(of_device_is_compatible);
+
+/**
+ *	of_get_parent - Get a node's parent if any
+ *	@node:	Node to get parent
+ *
+ *	Returns a node pointer with refcount incremented, use
+ *	of_node_put() on it when done.
+ */
+struct device_node *of_get_parent(const struct device_node *node)
+{
+	struct device_node *np;
+
+	if (!node)
+		return NULL;
+
+	read_lock(&devtree_lock);
+	np = of_node_get(node->parent);
+	read_unlock(&devtree_lock);
+	return np;
+}
+EXPORT_SYMBOL(of_get_parent);

include/asm-sparc/prom.h

@@ -69,6 +69,15 @@ extern int of_getintprop_default(struct device_node *np,
 
 extern void prom_build_devicetree(void);
 
+/* Dummy ref counting routines - to be implemented later */
+static inline struct device_node *of_node_get(struct device_node *node)
+{
+	return node;
+}
+static inline void of_node_put(struct device_node *node)
+{
+}
+
 /*
  * NB:  This is here while we transition from using asm/prom.h
  * to linux/of.h

include/asm-sparc64/prom.h

@@ -78,6 +78,15 @@ extern int of_getintprop_default(struct device_node *np,
 
 extern void prom_build_devicetree(void);
 
+/* Dummy ref counting routines - to be implemented later */
+static inline struct device_node *of_node_get(struct device_node *node)
+{
+	return node;
+}
+static inline void of_node_put(struct device_node *node)
+{
+}
+
 /*
  * NB:  This is here while we transition from using asm/prom.h
  * to linux/of.h