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

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Date:	Sun, 16 Nov 2014 16:56:58 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org, Coccinelle <cocci@...teme.lip6.fr>
Subject: Re: [PATCH 1/1] kernel-trace: Deletion of an unnecessary check before
 the function call "iput"

On Sun, 16 Nov 2014, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 16 Nov 2014 14:46:28 +0100
>
> The iput() 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>
> ---
>  kernel/trace/trace_uprobe.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 33ff6a2..ec002c0 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -552,8 +552,7 @@ error:
>  	return ret;
>
>  fail_address_parse:
> -	if (inode)
> -		iput(inode);
> +	iput(inode);

There are jumps to fail_address_parse where the value of inode can only be
NULL.

julia

>
>  	pr_info("Failed to parse address or file.\n");
>
> --
> 2.1.3
>
>
> --
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