linux-kernel - Re: [PATCH] hwmon/amc6821: Use common error handling code in amc6821_init

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Date:   Tue, 24 Oct 2017 13:18:12 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] hwmon/amc6821: Use common error handling code in
 amc6821_init_client()

On Tue, Oct 24, 2017 at 10:10:13PM +0200, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 24 Oct 2017 22:04:20 +0200
> 
> * Add two jump targets so that a bit of exception handling can be better
>   reused at the end of this function.
> 
>   This issue was detected by using the Coccinelle software.
> 
> * Delete the local variable "err" which became unnecessary
>   with this refactoring.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Nack; I am not a friend of that much verboseness to start with,
and I don't think the patch improves readability.

Guenter

> ---
>  drivers/hwmon/amc6821.c | 77 ++++++++++++++++++-------------------------------
>  1 file changed, 28 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c
> index 46b4e35fd555..5c067de3fdcf 100644
> --- a/drivers/hwmon/amc6821.c
> +++ b/drivers/hwmon/amc6821.c
> @@ -885,70 +885,42 @@ static int amc6821_detect(
>  static int amc6821_init_client(struct i2c_client *client)
>  {
>  	int config;
> -	int err = -EIO;
>  
>  	if (init) {
>  		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
> -
> -		if (config < 0) {
> -				dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> -				return err;
> -		}
> +		if (config < 0)
> +			goto report_read_failure;
>  
>  		config |= AMC6821_CONF4_MODE;
> -
>  		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
> -				config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> -			return err;
> -		}
> +					      config))
> +			goto report_write_failure;
>  
>  		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
> -
> -		if (config < 0) {
> -			dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> -			return err;
> -		}
> +		if (config < 0)
> +			goto report_read_failure;
>  
>  		dev_info(&client->dev, "Revision %d\n", config & 0x0f);
>  
>  		config &= ~AMC6821_CONF3_THERM_FAN_EN;
> -
>  		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
> -				config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> -			return err;
> -		}
> +					      config))
> +			goto report_write_failure;
>  
>  		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
> -
> -		if (config < 0) {
> -			dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> -			return err;
> -		}
> +		if (config < 0)
> +			goto report_read_failure;
>  
>  		config &= ~AMC6821_CONF2_RTFIE;
>  		config &= ~AMC6821_CONF2_LTOIE;
>  		config &= ~AMC6821_CONF2_RTOIE;
> -		if (i2c_smbus_write_byte_data(client,
> -				AMC6821_REG_CONF2, config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> -			return err;
> -		}
> +		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF2,
> +					      config))
> +			goto report_write_failure;
>  
>  		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
> -
> -		if (config < 0) {
> -			dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> -			return err;
> -		}
> +		if (config < 0)
> +			goto report_read_failure;
>  
>  		config &= ~AMC6821_CONF1_THERMOVIE;
>  		config &= ~AMC6821_CONF1_FANIE;
> @@ -958,14 +930,21 @@ static int amc6821_init_client(struct i2c_client *client)
>  		else
>  			config &= ~AMC6821_CONF1_PWMINV;
>  
> -		if (i2c_smbus_write_byte_data(
> -				client, AMC6821_REG_CONF1, config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> -			return err;
> -		}
> +		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1,
> +					      config))
> +			goto report_write_failure;
>  	}
>  	return 0;
> +
> +report_read_failure:
> +	dev_err(&client->dev,
> +		"Error reading configuration register, aborting.\n");
> +	return -EIO;
> +
> +report_write_failure:
> +	dev_err(&client->dev,
> +		"Configuration register write error, aborting.\n");
> +	return -EIO;
>  }
>  
>  static int amc6821_probe(struct i2c_client *client,
> -- 
> 2.14.3
>