[PATCH 1/3] OF: base: fix infinite loop in of_find_node_by_name

[Sebastian Hesselbarth]

of_find_node_by_name suffers from infinite looping, because it
does not check for root node of the tree iterated over. This adds a
check for parent pointer of last tested iterator entry, which is
NULL for the root node.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
---
Cc: barebox at lists.infradead.org
Cc: Hiroki Nishimoto <hiroki.nishimoto.if at gmail.com>
---
 drivers/of/base.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index f21476c..df71e8c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -301,9 +301,13 @@ struct device_node *of_find_node_by_name(struct device_node *from,
 	if (!from)
 		from = root_node;
 
-	of_tree_for_each_node(np, from)
+	of_tree_for_each_node(np, from) {
 		if (np->name && !of_node_cmp(np->name, name))
 			return np;
+		/* check for root node */
+		if (!np->parent)
+			break;
+	}
 
 	return NULL;
 }
-- 
1.7.10.4