[PATCH 1/5] of: fix of_get_next_child() for prev->parent != node

[Sascha Hauer]

of_get_next_child() is supposed to return the next sibling of 'prev' and
the function does exactly that. It expects that 'node' is always the
same parent node. of_graph_get_next_endpoint() breaks this expectation,
it walks further down the tree and then calls of_get_next_child() with
'node' being some subnode of the original node. Fix this by retrieving
'node' always from 'prev' and use 'node' only on initial entry when
'prev' is NULL.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 drivers/of/base.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 62d84786ae..6fd69e7d7d 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2054,6 +2054,9 @@ EXPORT_SYMBOL(of_get_next_available_child);
 struct device_node *of_get_next_child(const struct device_node *node,
 	struct device_node *prev)
 {
+	if (prev)
+		node = prev->parent;
+
 	prev = list_prepare_entry(prev, &node->children, parent_list);
 	list_for_each_entry_continue(prev, &node->children, parent_list)
 		return prev;

-- 
2.39.5