linux-kernel - Re: [PATCH] coresight: tmc: Delete an unnecessary check before the function call "kfree"

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Message-ID: <CANLsYkxx6dUN8PFQ8tzXugqahcQTLViyssX=P101WqEeAyGL8A@mail.gmail.com>
Date:	Mon, 25 Jul 2016 10:36:24 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] coresight: tmc: Delete an unnecessary check before the
 function call "kfree"

On 23 July 2016 at 12:08, SF Markus Elfring
<elfring@...rs.sourceforge.net> wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 23 Jul 2016 20:04:09 +0200
>
> The kfree() 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>
> ---
>  drivers/hwtracing/coresight/coresight-tmc-etf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> index e68289b..5fa49c4 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> @@ -168,7 +168,7 @@ out:
>         spin_unlock_irqrestore(&drvdata->spinlock, flags);
>
>         /* Free memory outside the spinlock if need be */
> -       if (!used && buf)
> +       if (!used)
>                 kfree(buf);
>
>         if (!ret)
> --
> 2.9.2
>

Applied - thanks.
Mathieu