linux-kernel - [PATCH] of: resolver: Add missing of_node

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Message-ID: <20160127152017.GA16048@amitoj-Inspiron-3542>
Date:	Wed, 27 Jan 2016 20:50:17 +0530
From:	Amitoj Kaur Chawla <amitoj1606@...il.com>
To:	pantelis.antoniou@...sulko.com, robh+dt@...nel.org,
	frowand.list@...il.com, grant.likely@...aro.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: [PATCH] of: resolver: Add missing of_node_put

for_each_child_of_node performs an of_node_get on each iteration, so
to break out of the loop an of_node_put is required.

Found using Coccinelle. The semantic patch used for this is as follows:

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

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

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
---
 drivers/of/resolver.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c
index 640eb4c..e2a0143 100644
--- a/drivers/of/resolver.c
+++ b/drivers/of/resolver.c
@@ -40,8 +40,10 @@ static struct device_node *__of_find_node_by_full_name(struct device_node *node,
 
 	for_each_child_of_node(node, child) {
 		found = __of_find_node_by_full_name(child, full_name);
-		if (found != NULL)
+		if (found != NULL) {
+			of_node_put(child);
 			return found;
+		}
 	}
 
 	return NULL;
-- 
1.9.1