linux-kernel - [PATCH 3/5] pinctrl: sh-pfc: add missing of_node

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Message-Id: <1450715988-4770-4-git-send-email-Julia.Lawall@lip6.fr>
Date:	Mon, 21 Dec 2015 17:39:46 +0100
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	kernel-janitors@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-sh@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] pinctrl: sh-pfc: add missing of_node_put

for_each_child_of_node performs an of_node_get on each iteration, so a
goto 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,e1;
identifier l;
@@

 for_each_child_of_node(e1,n) {
   ...
(
   of_node_put(n);
|
   e = n
|
   return n;
|
+  of_node_put(n);
?  goto l;
)
   ...
 }
l: ... when != n
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/pinctrl/sh-pfc/pinctrl.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c
index 863c3e3..87b0a59 100644
--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -273,8 +273,10 @@ static int sh_pfc_dt_node_to_map(struct pinctrl_dev *pctldev,
 	for_each_child_of_node(np, child) {
 		ret = sh_pfc_dt_subnode_to_map(pctldev, child, map, num_maps,
 					       &index);
-		if (ret < 0)
+		if (ret < 0) {
+			of_node_put(child);
 			goto done;
+		}
 	}
 
 	/* If no mapping has been found in child nodes try the config node. */

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