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: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 3f6238d..1ad56d3 100644 (file)
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1241,27 +1241,6 @@ 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
  *     @prev:  previous child of the parent node, or NULL to get first

diff --git a/arch/sparc/kernel/prom.c b/arch/sparc/kernel/prom.c
index 0f5aab4..b378715 100644 (file)
--- a/arch/sparc/kernel/prom.c
+++ b/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)
 {

diff --git a/arch/sparc64/kernel/prom.c b/arch/sparc64/kernel/prom.c
index a1ccc00..2462731 100644 (file)
--- a/arch/sparc64/kernel/prom.c
+++ b/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)
 {

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 70b6084..82bb786 100644 (file)
--- a/drivers/of/base.c
+++ b/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);

diff --git a/include/asm-sparc/prom.h b/include/asm-sparc/prom.h
index 57f86c8..c7d5495 100644 (file)
--- a/include/asm-sparc/prom.h
+++ b/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

diff --git a/include/asm-sparc64/prom.h b/include/asm-sparc64/prom.h
index 6a5e240..e83896f 100644 (file)
--- a/include/asm-sparc64/prom.h
+++ b/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