linux-kernel - Re: [PATCH v2] hwmon: g762: handle cleanup with devm_add

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Date:   Wed, 28 Feb 2018 20:10:39 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Peng Hao <peng.hao2@....com.cn>, jdelvare@...e.com
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hwmon: g762: handle cleanup with devm_add_action

On 03/01/2018 03:03 AM, Peng Hao wrote:
> Simplify code and use devm_add_action() to handle cleanup.
> 
> Signed-off-by: Peng Hao <peng.hao2@....com.cn>
> ---
>   drivers/hwmon/g762.c | 43 +++++++++++++++++--------------------------
>   1 file changed, 17 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/hwmon/g762.c b/drivers/hwmon/g762.c
> index 6d1208b..49046b4 100644
> --- a/drivers/hwmon/g762.c
> +++ b/drivers/hwmon/g762.c
> @@ -128,7 +128,6 @@ enum g762_regs {
>   			 G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2))
>   
>   struct g762_data {
> -	struct device *hwmon_dev;
>   	struct i2c_client *client;
>   	struct clk *clk;
>   
> @@ -174,6 +173,9 @@ struct g762_data {
>   		      */
>   };
>   
> +static void g762_remove(void *data);
> +
> +
Double empty line, and the need for a forward declaration usually means
that something is less than perfect.

>   /*
>    * Convert count value from fan controller register (FAN_SET_CNT) into fan
>    * speed RPM value. Note that the datasheet documents a basic formula;
> @@ -626,6 +628,7 @@ static int g762_of_clock_enable(struct i2c_client *client)
>   	data = i2c_get_clientdata(client);
>   	data->clk = clk;
>   
> +	devm_add_action(&client->dev, g762_remove, data);
>   	return 0;
>   
>    clk_unprep:
> @@ -1051,9 +1054,17 @@ static inline int g762_fan_init(struct device *dev)
>   					 data->fan_cmd1);
>   }
>   
> +static void g762_remove(void *data)
> +{
> +	struct g762_data *g762 = data;
> +
> +	g762_of_clock_disable(g762->client);

Why did you not just change the parameter of g762_of_clock_disable to
void *data and call
	devm_add_action(&client->dev, g762_of_clock_disable, data);
above ?

> +}
> +
>   static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id)
>   {
>   	struct device *dev = &client->dev;
> +	struct device *hwmon_dev;
>   	struct g762_data *data;
>   	int ret;
>   
> @@ -1080,35 +1091,16 @@ static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id)
>   		return ret;
>   	ret = g762_of_prop_import(client);
>   	if (ret)
> -		goto clock_dis;
> +		return ret;
>   	/* ... or platform_data */
>   	ret = g762_pdata_prop_import(client);
>   	if (ret)
> -		goto clock_dis;
> +		return ret;
>   
> -	data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
> +	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
>   							    data, g762_groups);
> -	if (IS_ERR(data->hwmon_dev)) {
> -		ret = PTR_ERR(data->hwmon_dev);
> -		goto clock_dis;
> -	}
> -
> -	return 0;
> -
> - clock_dis:
> -	g762_of_clock_disable(client);
> -
> -	return ret;
> -}
> -
> -static int g762_remove(struct i2c_client *client)
> -{
> -	struct g762_data *data = i2c_get_clientdata(client);
> -
> -	hwmon_device_unregister(data->hwmon_dev);
> -	g762_of_clock_disable(client);
> -
> -	return 0;
> +
empty line is unnecessary.

> +	return PTR_ERR_OR_ZERO(hwmon_dev);
>   }
>   
>   static struct i2c_driver g762_driver = {
> @@ -1117,7 +1109,6 @@ static int g762_remove(struct i2c_client *client)
>   		.of_match_table = of_match_ptr(g762_dt_match),
>   	},
>   	.probe	  = g762_probe,
> -	.remove	  = g762_remove,
>   	.id_table = g762_id,
>   };
>   
>