linux-kernel - [PATCH 2/5] power_supply: charger-manager: add missing of_node

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Date:	Sat, 10 Oct 2015 14:30:51 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	kernel-janitors@...r.kernel.org,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-pm@...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 2/5] power_supply: charger-manager: 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.

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/power/charger-manager.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index 907293e..1ea5d1a 100644
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -1581,8 +1581,10 @@ static struct charger_desc *of_cm_parse_desc(struct device *dev)
 				cables = devm_kzalloc(dev, sizeof(*cables)
 						* chg_regs->num_cables,
 						GFP_KERNEL);
-				if (!cables)
+				if (!cables) {
+					of_node_put(child);
 					return ERR_PTR(-ENOMEM);
+				}
 
 				chg_regs->cables = cables;
 

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