linux-kernel - Re: [PATCH] kdbus: Delete an unnecessary check before the function call "kdbus_domain

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Message-ID: <CANq1E4RW0HpwyKJLNF4tWiQ5Aigwi46s9utVcoXBZdycXvH2ag@mail.gmail.com>
Date:	Wed, 24 Jun 2015 14:44:45 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] kdbus: Delete an unnecessary check before the function
 call "kdbus_domain_unref"

Hi

On Wed, Jun 24, 2015 at 2:40 PM, SF Markus Elfring
<elfring@...rs.sourceforge.net> wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 24 Jun 2015 14:30:17 +0200
>
> The kdbus_domain_unref() function tests whether its argument is NULL
> and then returns 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@...rs.sourceforge.net>
> ---
>  ipc/kdbus/fs.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/ipc/kdbus/fs.c b/ipc/kdbus/fs.c
> index d01f33b..205a3ad 100644
> --- a/ipc/kdbus/fs.c
> +++ b/ipc/kdbus/fs.c
> @@ -325,9 +325,7 @@ static void fs_super_kill(struct super_block *sb)
>         }
>
>         kill_anon_super(sb);
> -
> -       if (domain)
> -               kdbus_domain_unref(domain);
> +       kdbus_domain_unref(domain);

Yeah, your patch is correct. The condition was kinda nice as it shows
the connection to the tear-down before the call to kill_anon_super().
But the function is simple enough for a reader to figure out
themselves.

Reviewed-by: David Herrmann <dh.herrmann@...il.com>

Thanks
David

>  }
>
>  static int fs_super_set(struct super_block *sb, void *data)
> --
> 2.4.4
>
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