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authorStephen Rothwell <sfr@canb.auug.org.au>2007-04-24 17:21:29 +1000
committerStephen Rothwell <sfr@canb.auug.org.au>2007-07-20 13:34:26 +1000
commitd1cd355a5e44dfe993efc0c0458ca9f99a28a9a3 (patch)
tree9bcc28338f70b8c3c5076f2dbf0a8d3ce551f0b8 /drivers/of/base.c
parente679c5f445fe142940e0962de9c5c82f10d9357c (diff)
Consolidate of_get_next_child
This adds a read_lock around the child/next accesses on Sparc. 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.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 82bb78680ff..6b6dfcc5652 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -134,3 +134,27 @@ struct device_node *of_get_parent(const struct device_node *node)
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
+ *
+ * Returns a node pointer with refcount incremented, use
+ * of_node_put() on it when done.
+ */
+struct device_node *of_get_next_child(const struct device_node *node,
+ struct device_node *prev)
+{
+ struct device_node *next;
+
+ read_lock(&devtree_lock);
+ next = prev ? prev->sibling : node->child;
+ for (; next; next = next->sibling)
+ if (of_node_get(next))
+ break;
+ of_node_put(prev);
+ read_unlock(&devtree_lock);
+ return next;
+}
+EXPORT_SYMBOL(of_get_next_child);