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

[Sebastian Hesselbarth]

of_find_node_with_property 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. Also set from node to current root_node if
NULL.

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, 6 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 25f2e96..0500c86 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -363,10 +363,16 @@ struct device_node *of_find_node_with_property(struct device_node *from,
 {
 	struct device_node *np;
 
+	if (!from)
+		from = root_node;
+
 	of_tree_for_each_node(np, from) {
 		struct property *pp = of_find_property(np, prop_name, NULL);
 		if (pp)
 			return np;
+		/* check for root node */
+		if (!np->parent)
+			break;
 	}
 
 	return NULL;
-- 
1.7.10.4