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[PATCH 5/9] drm/tegra: dc: add missing of_node_put

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  [PATCH 5/9] drm/tegra: dc: add missing of_node_put Julia Lawall <Julia.Lawall@lip6.fr> - 2015-10-24 17:00 +0200

#1255196 — [PATCH 5/9] drm/tegra: dc: add missing of_node_put

for_each_matching_node performs an of_node_get on each iteration, so
a break out of the loop requires an of_node_put.

A simplified version of the semantic patch that fixes this problem is as
follows (http://coccinelle.lip6.fr):

// <smpl>
@@
local idexpression n;
expression e;
@@

 for_each_matching_node(n,...) {
   ...
(
   of_node_put(n);
|
   e = n
|
+  of_node_put(n);
?  break;
)
   ...
 }
... when != n
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/gpu/drm/tegra/dc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index b4af4ab..f0e6f37 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1945,8 +1945,10 @@ static int tegra_dc_parse_dt(struct tegra_dc *dc)
 		 * cases where only a single display controller is used.
 		 */
 		for_each_matching_node(np, tegra_dc_of_match) {
-			if (np == dc->dev->of_node)
+			if (np == dc->dev->of_node) {
+				of_node_put(np);
 				break;
+			}
 
 			value++;
 		}

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