linux-kernel - Re: [PATCH v3 3/4] media: i2c: ds90ub953: use devm_mutex

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Message-ID: <aMlzfludCGR/zOzY@lizhi-Precision-Tower-5810>
Date: Tue, 16 Sep 2025 10:26:06 -0400
From: Frank Li <Frank.li@....com>
To: Guoniu Zhou <guoniu.zhou@....com>
Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev
Subject: Re: [PATCH v3 3/4] media: i2c: ds90ub953: use devm_mutex_init() to
 simplify code

On Tue, Sep 16, 2025 at 05:43:45PM +0800, Guoniu Zhou wrote:
> Use devm_mutex_init() to simplify the code. No functional change.

Use devm_mutex_init() and dev_err_probe() to ...

Reviewed-by: Frank Li <Frank.Li@....com>

Frank
>
> Signed-off-by: Guoniu Zhou <guoniu.zhou@....com>
> ---
>  drivers/media/i2c/ds90ub953.c | 33 +++++++++++++--------------------
>  1 file changed, 13 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/media/i2c/ds90ub953.c b/drivers/media/i2c/ds90ub953.c
> index c6b77e4982a3449896e564a288ff1562cb1dcb79..47e7c0a5aae7737182e6a1f2797be01e7ecc8142 100644
> --- a/drivers/media/i2c/ds90ub953.c
> +++ b/drivers/media/i2c/ds90ub953.c
> @@ -1342,7 +1342,9 @@ static int ub953_probe(struct i2c_client *client)
>  	if (!priv->plat_data)
>  		return dev_err_probe(dev, -ENODEV, "Platform data missing\n");
>
> -	mutex_init(&priv->reg_lock);
> +	ret = devm_mutex_init(dev, &priv->reg_lock);
> +	if (ret)
> +		return ret;
>
>  	/*
>  	 * Initialize to invalid values so that the first reg writes will
> @@ -1351,32 +1353,26 @@ static int ub953_probe(struct i2c_client *client)
>  	priv->current_indirect_target = 0xff;
>
>  	priv->regmap = devm_regmap_init_i2c(client, &ub953_regmap_config);
> -	if (IS_ERR(priv->regmap)) {
> -		ret = PTR_ERR(priv->regmap);
> -		dev_err_probe(dev, ret, "Failed to init regmap\n");
> -		goto err_mutex_destroy;
> -	}
> +	if (IS_ERR(priv->regmap))
> +		return dev_err_probe(dev, PTR_ERR(priv->regmap),
> +				     "Failed to init regmap\n");
>
>  	priv->clkin = devm_clk_get_optional(dev, "clkin");
> -	if (IS_ERR(priv->clkin)) {
> -		ret = PTR_ERR(priv->clkin);
> -		dev_err_probe(dev, ret, "failed to parse 'clkin'\n");
> -		goto err_mutex_destroy;
> -	}
> +	if (IS_ERR(priv->clkin))
> +		return dev_err_probe(dev, PTR_ERR(priv->clkin),
> +				     "Failed to parse 'clkin'\n");
>
>  	ret = ub953_parse_dt(priv);
>  	if (ret)
> -		goto err_mutex_destroy;
> +		return ret;
>
>  	ret = ub953_hw_init(priv);
>  	if (ret)
> -		goto err_mutex_destroy;
> +		return ret;
>
>  	ret = ub953_gpiochip_probe(priv);
> -	if (ret) {
> -		dev_err_probe(dev, ret, "Failed to init gpiochip\n");
> -		goto err_mutex_destroy;
> -	}
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to init gpiochip\n");
>
>  	ret = ub953_register_clkout(priv);
>  	if (ret) {
> @@ -1400,8 +1396,6 @@ static int ub953_probe(struct i2c_client *client)
>  	ub953_subdev_uninit(priv);
>  err_gpiochip_remove:
>  	ub953_gpiochip_remove(priv);
> -err_mutex_destroy:
> -	mutex_destroy(&priv->reg_lock);
>
>  	return ret;
>  }
> @@ -1416,7 +1410,6 @@ static void ub953_remove(struct i2c_client *client)
>  	ub953_subdev_uninit(priv);
>
>  	ub953_gpiochip_remove(priv);
> -	mutex_destroy(&priv->reg_lock);
>  }
>
>  static const struct ub953_hw_data ds90ub953_hw = {
>
> --
> 2.34.1
>