linux-kernel - [PATCH 9/9] pinctrl: at91: add missing of_node

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Date:	Sat, 24 Oct 2015 16:42:35 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc:	kernel-janitors@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: [PATCH 9/9] pinctrl: at91: add missing of_node_put

for_each_child_of_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>
@@
expression root,e;
local idexpression child;
@@

 for_each_child_of_node(root, child) {
   ... when != of_node_put(child)
       when != e = child
(
   return child;
|
+  of_node_put(child);
?  return ...;
)
   ...
 }
// </smpl>

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

---
 drivers/pinctrl/pinctrl-at91.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index ce6e589..0d2fc0c 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -1122,8 +1122,10 @@ static int at91_pinctrl_parse_functions(struct device_node *np,
 		func->groups[i] = child->name;
 		grp = &info->groups[grp_index++];
 		ret = at91_pinctrl_parse_groups(child, grp, info, i++);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			return ret;
+		}
 	}
 
 	return 0;
@@ -1196,6 +1198,7 @@ static int at91_pinctrl_probe_dt(struct platform_device *pdev,
 		ret = at91_pinctrl_parse_functions(child, info, i++);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to parse function\n");
+			of_node_put(child);
 			return ret;
 		}
 	}

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