linux-kernel - Re: [PATCH] backlight: change the return type of backlight_update

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Date:	Fri, 29 May 2015 01:25:43 +0900
From:	"Jingoo Han" <jingoohan1@...il.com>
To:	"'Hyungwon Hwang'" <human.hwang@...sung.com>
Cc:	<linux-kernel@...r.kernel.org>,
	"'Lee Jones'" <lee.jones@...aro.org>
Subject: Re: [PATCH] backlight: change the return type of backlight_update_status() to int

On Thursday, May 28, 2015 4:25 PM, Hyungwon Hwang wrote:
> 
> Backlight device returns the result of update_status(), but
> backlight_update_status() ignores it. So the consumers cannot confirm the
> result of their function call. This patch makes the result to be returned
> back for consumers.
> 
> Signed-off-by: Hyungwon Hwang <human.hwang@...sung.com>

Acked-by: Jingoo Han <jingoohan1@...il.com>

> ---
>  include/linux/backlight.h | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> index adb14a8..1e7a69a 100644
> --- a/include/linux/backlight.h
> +++ b/include/linux/backlight.h
> @@ -117,12 +117,16 @@ struct backlight_device {
>  	int use_count;
>  };
> 
> -static inline void backlight_update_status(struct backlight_device *bd)
> +static inline int backlight_update_status(struct backlight_device *bd)
>  {
> +	int ret = -ENOENT;
> +
>  	mutex_lock(&bd->update_lock);
>  	if (bd->ops && bd->ops->update_status)
> -		bd->ops->update_status(bd);
> +		ret = bd->ops->update_status(bd);
>  	mutex_unlock(&bd->update_lock);
> +
> +	return ret;
>  }
> 
>  extern struct backlight_device *backlight_device_register(const char *name,
> --
> 1.9.1

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