linux-kernel - Re: [PATCH] ASoC: fsl: Check before clk

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Date:   Wed, 1 Jun 2022 15:22:13 +0200
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     Yihao Han <hanyihao@...o.com>
Cc:     Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Shawn Guo <shawnguo@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: fsl: Check before clk_put() not needed

On Wed, Jun 01, 2022 at 06:14:29AM -0700, Yihao Han wrote:
> clk_put() already checks the clk ptr using !clk and IS_ERR()
> so there is no need to check it again before calling it.
> 
> Signed-off-by: Yihao Han <hanyihao@...o.com>
> ---
>  sound/soc/fsl/imx-sgtl5000.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/sound/soc/fsl/imx-sgtl5000.c b/sound/soc/fsl/imx-sgtl5000.c
> index 580a0d963f0e..16a281820186 100644
> --- a/sound/soc/fsl/imx-sgtl5000.c
> +++ b/sound/soc/fsl/imx-sgtl5000.c
> @@ -185,8 +185,7 @@ static int imx_sgtl5000_probe(struct platform_device *pdev)
>  put_device:
>  	put_device(&codec_dev->dev);
>  fail:
> -	if (data && !IS_ERR(data->codec_clk))
> -		clk_put(data->codec_clk);
> +	clk_put(data->codec_clk);

The fail label is used before data is initialized, so the if (data)
check is really needed.

Sascha

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