linux-kernel - [PATCH v2] leds/led-class: Add missing put

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Date:	Fri, 31 Jul 2015 13:36:21 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Alan Tull <delicious.quinoa@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v2] leds/led-class: Add missing put_device()

Devices found by class_find_device must be freed with put_device().
Otherwise the reference count will not work properly.

Fixes: a96aa64cb572 ("leds/led-class: Handle LEDs with the same name")
Reported-by: Alan Tull <delicious.quinoa@...il.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
Thanks Alan for the initial report and Jacek for the review

v2: Changes from Jacek Anaszewski <jacek.anaszewski@...il.com>
If ret <= len device was not relased

 drivers/leds/led-class.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index beabfbc6f7cd..ca51d58bed24 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -228,12 +228,15 @@ static int led_classdev_next_name(const char *init_name, char *name,
 {
 	unsigned int i = 0;
 	int ret = 0;
+	struct device *dev;
 
 	strlcpy(name, init_name, len);
 
-	while (class_find_device(leds_class, NULL, name, match_name) &&
-	       (ret < len))
+	while ((ret < len) &&
+	       (dev = class_find_device(leds_class, NULL, name, match_name))) {
+		put_device(dev);
 		ret = snprintf(name, len, "%s_%u", init_name, ++i);
+	}
 
 	if (ret >= len)
 		return -ENOMEM;
-- 
2.4.6

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