linux-kernel - Re: [PATCH] s390-ctcm: Delete unnecessary checks before the function call "channel

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Date:	Wed, 25 Nov 2015 10:37:26 +0100
From:	Ursula Braun <ubraun@...ux.vnet.ibm.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	linux-s390@...r.kernel.org, Ursula Braun <ursula.braun@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] s390-ctcm: Delete unnecessary checks before the
 function call "channel_remove"

Applied to our local git. Thanks. It will be part of my next patch
submission for net-next.

Kind regards, Ursula Braun, IBM Germany

On Tue, 2015-11-17 at 20:20 +0100, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 17 Nov 2015 20:10:02 +0100
> 
> The channel_remove() function tests whether its argument is NULL
> and then returns immediately. Thus the test around the calls is not needed.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/s390/net/ctcm_main.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
> index 05c37d6..c3e2252 100644
> --- a/drivers/s390/net/ctcm_main.c
> +++ b/drivers/s390/net/ctcm_main.c
> @@ -1677,11 +1677,8 @@ static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
> 
>  	ccw_device_set_offline(cgdev->cdev[1]);
>  	ccw_device_set_offline(cgdev->cdev[0]);
> -
> -	if (priv->channel[CTCM_READ])
> -		channel_remove(priv->channel[CTCM_READ]);
> -	if (priv->channel[CTCM_WRITE])
> -		channel_remove(priv->channel[CTCM_WRITE]);
> +	channel_remove(priv->channel[CTCM_READ]);
> +	channel_remove(priv->channel[CTCM_WRITE]);
>  	priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
> 
>  	return 0;


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