of: Warn if of_graph_get_next_endpoint is called with the root node

If of_graph_get_next_endpoint is given a parentless node instead of an
endpoint node, it is clearly a bug.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index b2f223fa47e9..b5e690bd6e9c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2028,8 +2028,8 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
                 of_node_put(node);
         } else {
                 port = of_get_parent(prev);
-                if (!port)
-                        /* Hm, has someone given us the root node ?... */
+                if (WARN_ONCE(!port, "%s(): endpoint %s has no parent node\n",
+                              __func__, prev->full_name))
                         return NULL;
 
                 /* Avoid dropping prev node refcount to 0. */