linux-kernel - Re: [PATCH -next v2 1/2] i2c: mt7621: fix missing clk_disable_unprepare() on error in mtk_i2c

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Message-ID: <fe4d398e-978c-6784-e3f6-01b83da3f249@denx.de>
Date:   Mon, 16 May 2022 08:26:20 +0200
From:   Stefan Roese <sr@...x.de>
To:     Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org
Cc:     matthias.bgg@...il.com, wsa@...-dreams.de,
        christophe.jaillet@...adoo.fr
Subject: Re: [PATCH -next v2 1/2] i2c: mt7621: fix missing
 clk_disable_unprepare() on error in mtk_i2c_probe()

On 14.05.22 04:31, Yang Yingliang wrote:
> Fix the missing clk_disable_unprepare() before return
> from mtk_i2c_probe() in the error handling case.
> 
> Fixes: d04913ec5f89 ("i2c: mt7621: Add MediaTek MT7621/7628/7688 I2C driver")
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>

Reviewed-by: Stefan Roese <sr@...x.de>

Thanks,
Stefan

> ---
>     v2: add return 0 in normal path.
> ---
>   drivers/i2c/busses/i2c-mt7621.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-mt7621.c b/drivers/i2c/busses/i2c-mt7621.c
> index 45fe4a7fe0c0..901f0fb04fee 100644
> --- a/drivers/i2c/busses/i2c-mt7621.c
> +++ b/drivers/i2c/busses/i2c-mt7621.c
> @@ -304,7 +304,8 @@ static int mtk_i2c_probe(struct platform_device *pdev)
>   
>   	if (i2c->bus_freq == 0) {
>   		dev_warn(i2c->dev, "clock-frequency 0 not supported\n");
> -		return -EINVAL;
> +		ret = -EINVAL;
> +		goto err_disable_clk;
>   	}
>   
>   	adap = &i2c->adap;
> @@ -322,10 +323,15 @@ static int mtk_i2c_probe(struct platform_device *pdev)
>   
>   	ret = i2c_add_adapter(adap);
>   	if (ret < 0)
> -		return ret;
> +		goto err_disable_clk;
>   
>   	dev_info(&pdev->dev, "clock %u kHz\n", i2c->bus_freq / 1000);
>   
> +	return 0;
> +
> +err_disable_clk:
> +	clk_disable_unprepare(i2c->clk);
> +
>   	return ret;
>   }
>   

Viele Grüße,
Stefan Roese

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