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authorStephen Rothwell <sfr@canb.auug.org.au>2007-04-24 17:16:16 +1000
committerStephen Rothwell <sfr@canb.auug.org.au>2007-07-20 13:32:58 +1000
commite679c5f445fe142940e0962de9c5c82f10d9357c (patch)
tree997daf76cc643fdc495ce0a667cfdc5b1c9515ab /drivers/of/base.c
parent581b605a83ec241a2aff8ef780e08b9414c8dfd8 (diff)
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>
Diffstat (limited to 'drivers/of/base.c')
-rw-r--r--drivers/of/base.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 70b60845140..82bb78680ff 100644
--- 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);