From mboxrd@z Thu Jan  1 00:00:00 1970
From: SF Markus Elfring <elfring@users.sourceforge.net>
Date: Sun, 28 Jun 2015 11:54:56 +0000
Subject: Re: [PATCH] HID-picoLCD: Deletion of unnecessary checks before three function calls
Message-Id: <558FE090.8030307@users.sourceforge.net>
List-Id: <kernel-janitors.vger.kernel.org>
References: <5307CAA2.8060406@users.sourceforge.net> <alpine.DEB.2.02.1402212321410.2043@localhost6.localdomain6> <530A086E.8010901@users.sourceforge.net> <alpine.DEB.2.02.1402231635510.1985@localhost6.localdomain6> <530A72AA.3000601@users.sourceforge.net> <alpine.DEB.2.02.1402240658210.2090@localhost6.localdomain6> <530B5FB6.6010207@users.sourceforge.net> <alpine.DEB.2.10.1402241710370.2074@hadrien> <530C5E18.1020800@users.sourceforge.net> <alpine.DEB.2.10.1402251014170.2080@hadrien> <530CD2C4.4050903@users.sourceforge.net> <alpine.DEB.2.10.1402251840450.7035@hadrien> <530CF8FF.8080600@users.sourceforge.net> <alpine.DEB.2.02.1402252117150.2047@localhost6.localdomain6> <530DD06F.4090703@users.sourceforge.net> <alpine.DEB.2.02.1402262129250.2221@localhost6.localdomain6> <5317A59D.4@users.so
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To: =?windows-1252?Q?Bruno_Pr=E9mont?= <bonbons@linux-vserver.org>, Jiri Kosina <jkosina@suse.cz>, linux-input@vger.kernel.org
Cc: LKML <linux-kernel@vger.kernel.org>, kernel-janitors@vger.kernel.org, Julia Lawall <julia.lawall@lip6.fr>

> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Wed, 19 Nov 2014 18:30:22 +0100
> 
> The functions backlight_device_unregister(), lcd_device_unregister() and
> rc_unregister_device() test whether their argument is NULL and then
> return immediately. Thus the test around the call is not needed.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  drivers/hid/hid-picolcd_backlight.c | 3 +--
>  drivers/hid/hid-picolcd_cir.c       | 3 +--
>  drivers/hid/hid-picolcd_lcd.c       | 3 +--
>  3 files changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/hid/hid-picolcd_backlight.c b/drivers/hid/hid-picolcd_backlight.c
> index a32c5f8..808807a 100644
> --- a/drivers/hid/hid-picolcd_backlight.c
> +++ b/drivers/hid/hid-picolcd_backlight.c
> @@ -94,8 +94,7 @@ void picolcd_exit_backlight(struct picolcd_data *data)
>  	struct backlight_device *bdev = data->backlight;
>  
>  	data->backlight = NULL;
> -	if (bdev)
> -		backlight_device_unregister(bdev);
> +	backlight_device_unregister(bdev);
>  }
>  
>  int picolcd_resume_backlight(struct picolcd_data *data)
> diff --git a/drivers/hid/hid-picolcd_cir.c b/drivers/hid/hid-picolcd_cir.c
> index 045f8eb..9628651 100644
> --- a/drivers/hid/hid-picolcd_cir.c
> +++ b/drivers/hid/hid-picolcd_cir.c
> @@ -145,7 +145,6 @@ void picolcd_exit_cir(struct picolcd_data *data)
>  	struct rc_dev *rdev = data->rc_dev;
>  
>  	data->rc_dev = NULL;
> -	if (rdev)
> -		rc_unregister_device(rdev);
> +	rc_unregister_device(rdev);
>  }
>  
> diff --git a/drivers/hid/hid-picolcd_lcd.c b/drivers/hid/hid-picolcd_lcd.c
> index 89821c2..22dcbe1 100644
> --- a/drivers/hid/hid-picolcd_lcd.c
> +++ b/drivers/hid/hid-picolcd_lcd.c
> @@ -92,8 +92,7 @@ void picolcd_exit_lcd(struct picolcd_data *data)
>  	struct lcd_device *ldev = data->lcd;
>  
>  	data->lcd = NULL;
> -	if (ldev)
> -		lcd_device_unregister(ldev);
> +	lcd_device_unregister(ldev);
>  }
>  
>  int picolcd_resume_lcd(struct picolcd_data *data)
> 

Would you like to integrate this update suggestion
into another source code repository?

Regards,
Markus