linux-kernel - [PATCH] drivers: hwmon: fix device_node

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Date:   Tue, 10 Jan 2017 06:48:02 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Jaghathiswari Rankappagounder Natarajan <jaghu@...gle.com>
cc:     openbmc@...ts.ozlabs.org, joel@....id.au, jdelvare@...e.com,
        linux@...ck-us.net, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, corbet@....net,
        linux-doc@...r.kernel.org, robh+dt@...nel.org,
        mark.rutland@....com, devicetree@...r.kernel.org, kbuild-all@...org
Subject: [PATCH] drivers: hwmon: fix device_node_continue.cocci warnings 

Device node iterators put the previous value of the index variable, so an
explicit put causes a double put.

Generated by: scripts/coccinelle/iterators/device_node_continue.cocci

CC: Jaghathiswari Rankappagounder Natarajan <jaghu@...gle.com>
Signed-off-by: Julia Lawall <julia.lawall@...6.fr>
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---

The patch would not be needed if aspeed_create_type etc perform a second
get, beyond the one in the iterator.

 aspeed-pwm-tacho.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/hwmon/aspeed-pwm-tacho.c
+++ b/drivers/hwmon/aspeed-pwm-tacho.c
@@ -833,21 +833,18 @@ static int aspeed_pwm_tacho_probe(struct
 	type_np = of_get_child_by_name(np, "type_values");
 	for_each_child_of_node(type_np, child) {
 		aspeed_create_type(child, priv, type_index++);
-		of_node_put(child);
 	}
 	of_node_put(type_np);
 	pwm_np = of_get_child_by_name(np, "pwm_port");
 	for_each_child_of_node(pwm_np, child) {
 		aspeed_create_pwm_port(child, priv, pwm_index++,
 				       group_index++);
-		of_node_put(child);
 	}
 	of_node_put(pwm_np);
 	fan_tach_np = of_get_child_by_name(np, "fan_tach_channel");
 	for_each_child_of_node(fan_tach_np, child) {
 		aspeed_create_fan_tach_channel(&pdev->dev, child, priv,
 					       fan_index++, group_index++);
-		of_node_put(child);
 	}
 	of_node_put(fan_tach_np);
 	of_node_put(np);