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

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Date:	Fri, 31 Jul 2015 18:15:50 +0200
From:	Jacek Anaszewski <jacek.anaszewski@...il.com>
To:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
	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
Subject: Re: [PATCH v2] leds/led-class: Add missing put_device()

Hi Ricardo,

Thanks for the update.

On 31.07.2015 13:36, Ricardo Ribalda Delgado wrote:
> 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;
>

Acked-by: Jacek Anaszewski <j.anaszewski@...sung.com>

-- 
Best Regards,
Jacek Anaszewski
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