linux-kernel - [PATCH 4.2.y-ckt 124/305] iio: adc: spmi-vadc: add missing of_node

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Message-Id: <1452902519-2754-125-git-send-email-kamal@canonical.com>
Date:	Fri, 15 Jan 2016 15:58:58 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Julia Lawall <Julia.Lawall@...6.fr>,
	Jonathan Cameron <jic23@...nel.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 124/305] iio: adc: spmi-vadc: add missing of_node_put

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Julia Lawall <Julia.Lawall@...6.fr>

commit d4c65fe4ed69a62a30a680789322ed677e3438af upstream.

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>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/iio/adc/qcom-spmi-vadc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/qcom-spmi-vadc.c b/drivers/iio/adc/qcom-spmi-vadc.c
index 0c4618b..c2babe5 100644
--- a/drivers/iio/adc/qcom-spmi-vadc.c
+++ b/drivers/iio/adc/qcom-spmi-vadc.c
@@ -839,8 +839,10 @@ static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node)
 
 	for_each_available_child_of_node(node, child) {
 		ret = vadc_get_dt_channel_data(vadc->dev, &prop, child);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			return ret;
+		}
 
 		vadc->chan_props[index] = prop;
 
-- 
1.9.1