linux-kernel - [PATCH 4/9] leds: 88pm860x: add missing of_node

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Date:	Sat, 24 Oct 2015 16:42:30 +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 4/9] leds: 88pm860x: 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>
@@
local idexpression n;
expression e,r;
@@

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

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

---
 drivers/leds/leds-88pm860x.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/leds/leds-88pm860x.c b/drivers/leds/leds-88pm860x.c
index 1497a09..7870840 100644
--- a/drivers/leds/leds-88pm860x.c
+++ b/drivers/leds/leds-88pm860x.c
@@ -142,6 +142,7 @@ static int pm860x_led_dt_init(struct platform_device *pdev,
 			of_property_read_u32(np, "marvell,88pm860x-iset",
 					     &iset);
 			data->iset = PM8606_LED_CURRENT(iset);
+			of_node_put(np);
 			break;
 		}
 	}

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