linux-kernel - [PATCH 3/9] leds: bcm6328: add missing of_node

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Message-Id: <1445697755-26341-4-git-send-email-Julia.Lawall@lip6.fr>
Date:	Sat, 24 Oct 2015 16:42:29 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Richard Purdie <rpurdie@...ys.net>
Cc:	kernel-janitors@...r.kernel.org,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...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 3/9] leds: bcm6328: add missing of_node_put

for_each_available_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_available_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/leds/leds-bcm6328.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/leds-bcm6328.c b/drivers/leds/leds-bcm6328.c
index 18de094..c7ea5c6 100644
--- a/drivers/leds/leds-bcm6328.c
+++ b/drivers/leds/leds-bcm6328.c
@@ -403,8 +403,10 @@ static int bcm6328_leds_probe(struct platform_device *pdev)
 			rc = bcm6328_led(dev, child, reg, mem, lock,
 					 blink_leds, blink_delay);
 
-		if (rc < 0)
+		if (rc < 0) {
+			of_node_put(child);
 			return rc;
+		}
 	}
 
 	return 0;

--
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