linux-kernel - [PATCH 1/9] powerpc/powernv: add missing of_node

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Date:	Sat, 24 Oct 2015 16:42:27 +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 1/9] powerpc/powernv: 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/leds/leds-powernv.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/leds-powernv.c b/drivers/leds/leds-powernv.c
index 2c5c5b1..1e75e1f 100644
--- a/drivers/leds/leds-powernv.c
+++ b/drivers/leds/leds-powernv.c
@@ -262,15 +262,19 @@ static int powernv_led_classdev(struct platform_device *pdev,
 		while ((cur = of_prop_next_string(p, cur)) != NULL) {
 			powernv_led = devm_kzalloc(dev, sizeof(*powernv_led),
 						   GFP_KERNEL);
-			if (!powernv_led)
+			if (!powernv_led) {
+				of_node_put(np);
 				return -ENOMEM;
+			}
 
 			powernv_led->common = powernv_led_common;
 			powernv_led->loc_code = (char *)np->name;
 
 			rc = powernv_led_create(dev, powernv_led, cur);
-			if (rc)
+			if (rc) {
+				of_node_put(np);
 				return rc;
+			}
 		} /* while end */
 	}
 

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