linux-kernel - [PATCH v5 3/7] of: Warn if of_graph_get_next

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Date:	Thu, 27 Feb 2014 18:35:36 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Grant Likely <grant.likely@...aro.org>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org, Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH v5 3/7] 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@...gutronix.de>
---
 drivers/of/base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index b2f223f..6e650cf 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 has no parent node\n",
+			      __func__))
 			return NULL;
 
 		/* Avoid dropping prev node refcount to 0. */
-- 
1.8.5.3

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