[PATCH v6 8/8] of: Warn if of_graph_parse_endpoint is called with the root node

[Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>]

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

Signed-off-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
 drivers/of/base.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index ffd0217..75de6bd 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1996,6 +1996,9 @@ int of_graph_parse_endpoint(const struct device_node *node,
 {
 	struct device_node *port_node = of_get_parent(node);
 
+	WARN_ONCE(!port_node, "%s(): endpoint %s has no parent node\n",
+		  __func__, node->full_name);
+
 	memset(endpoint, 0, sizeof(*endpoint));
 
 	endpoint->local_node = node;
-- 
1.9.0.rc3

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