linux-kernel - Re: [PATCH 1/1] backlight: lp8788: Deletion of an unnecessary check before the function call "backlight_device

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Date:	Mon, 24 Nov 2014 10:10:06 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	Bryan Wu <cooloney@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 1/1] backlight: lp8788: Deletion of an unnecessary check
 before the function call "backlight_device_unregister"

On Sun, 23 Nov 2014, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 23 Nov 2014 17:33:08 +0100
> 
> The backlight_device_unregister() function tests whether its argument is NULL
> and then returns immediately. Thus the test around the call is not needed.

Also the $SUBJECT should be less than 75 chars.

> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/video/backlight/lp8788_bl.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/video/backlight/lp8788_bl.c b/drivers/video/backlight/lp8788_bl.c
> index d6c4f6a..24a055c 100644
> --- a/drivers/video/backlight/lp8788_bl.c
> +++ b/drivers/video/backlight/lp8788_bl.c
> @@ -221,8 +221,7 @@ static void lp8788_backlight_unregister(struct lp8788_bl *bl)
>  {
>  	struct backlight_device *bl_dev = bl->bl_dev;
>  
> -	if (bl_dev)
> -		backlight_device_unregister(bl_dev);
> +	backlight_device_unregister(bl_dev);
>  }
>  
>  static ssize_t lp8788_get_bl_ctl_mode(struct device *dev,

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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