Oct 24 2015

drm/tegra: dc: Add missing of_node_put() 

Author: Julia Lawall <Julia.Lawall@lip6.fr>

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):

// 
@@
local idexpression n;
expression e;
@@

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

Signed-off-by: Julia Lawall 
Signed-off-by: Thierry Reding 

---
 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 e9f24a8..ea174b5 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1952,8 +1952,10 @@ 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++;
 		}

qlambert