linux-kernel - Re: [PATCH] iio/light/gp2ap020a00f: Use common error handling code in gp2ap020a00f_adjust_lux

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Message-ID: <20171026173113.371995f3@archlinux>
Date:   Thu, 26 Oct 2017 17:31:13 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-iio@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
        Jacek Anaszewski <j.anaszewski@...sung.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] iio/light/gp2ap020a00f: Use common error handling code
 in gp2ap020a00f_adjust_lux_mode()

On Thu, 26 Oct 2017 10:00:21 +0200
SF Markus Elfring <elfring@...rs.sourceforge.net> wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Thu, 26 Oct 2017 09:50:21 +0200
> 
> * Add jump targets so that two error messages are stored only once
>   at the end of this function implementation.
> 
> * Adjust condition checks.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Same issue - readability is worse than without the patch so it is always
going to be rejected.

Hence I am not going to take this or anything similar, and I doubt anyone
else in the kernel will either...

Jonathan

> ---
>  drivers/iio/light/gp2ap020a00f.c | 37 +++++++++++++++++--------------------
>  1 file changed, 17 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/iio/light/gp2ap020a00f.c b/drivers/iio/light/gp2ap020a00f.c
> index 44b13fbcd093..ae29bce660ac 100644
> --- a/drivers/iio/light/gp2ap020a00f.c
> +++ b/drivers/iio/light/gp2ap020a00f.c
> @@ -741,19 +741,13 @@ static bool gp2ap020a00f_adjust_lux_mode(struct gp2ap020a00f_data *data,
>  		 */
>  		err =  gp2ap020a00f_write_event_threshold(data,
>  					GP2AP020A00F_THRESH_TH, false);
> -		if (err < 0) {
> -			dev_err(&data->client->dev,
> -				"Clearing als threshold register failed.\n");
> -			return false;
> -		}
> +		if (err)
> +			goto report_clearing_failure;
>  
>  		err =  gp2ap020a00f_write_event_threshold(data,
>  					GP2AP020A00F_THRESH_TL, false);
> -		if (err < 0) {
> -			dev_err(&data->client->dev,
> -				"Clearing als threshold register failed.\n");
> -			return false;
> -		}
> +		if (err)
> +			goto report_clearing_failure;
>  
>  		/* Change lux mode */
>  		err = regmap_update_bits(data->regmap,
> @@ -793,27 +787,30 @@ static bool gp2ap020a00f_adjust_lux_mode(struct gp2ap020a00f_data *data,
>  		if (test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags)) {
>  			err =  gp2ap020a00f_write_event_threshold(data,
>  					GP2AP020A00F_THRESH_TH, true);
> -			if (err < 0) {
> -				dev_err(&data->client->dev,
> -				"Adjusting als threshold value failed.\n");
> -				return false;
> -			}
> +			if (err)
> +				goto report_adjustment_failure;
>  		}
>  
>  		if (test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags)) {
>  			err =  gp2ap020a00f_write_event_threshold(data,
>  					GP2AP020A00F_THRESH_TL, true);
> -			if (err < 0) {
> -				dev_err(&data->client->dev,
> -				"Adjusting als threshold value failed.\n");
> -				return false;
> -			}
> +			if (err)
> +				goto report_adjustment_failure;
>  		}
>  
>  		return true;
>  	}
>  
>  	return false;
> +
> +report_clearing_failure:
> +	dev_err(&data->client->dev,
> +		"Clearing als threshold register failed.\n");
> +	return false;
> +
> +report_adjustment_failure:
> +	dev_err(&data->client->dev, "Adjusting als threshold value failed.\n");
> +	return false;
>  }
>  
>  static void gp2ap020a00f_output_to_lux(struct gp2ap020a00f_data *data,