linux-kernel - Re: [PATCH 1/7] iio: light: tsl2583: return proper error code

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Date:   Sat, 22 Oct 2016 18:18:59 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        gregkh@...uxfoundation.org, linux-iio@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] iio: light: tsl2583: return proper error code

On 19/10/16 11:32, Brian Masney wrote:
> taos_gain_store() and taos_als_calibrate() both have a code path where
> -1 was returned. This patch changes the code so that a proper error code
> is returned to make the code consistent with the error paths that are
> present within those same functions.
> 
> Signed-off-by: Brian Masney <masneyb@...tation.org>
> ---
>  drivers/staging/iio/light/tsl2583.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
> index 08f1583..1e42a19 100644
> --- a/drivers/staging/iio/light/tsl2583.c
> +++ b/drivers/staging/iio/light/tsl2583.c
> @@ -359,7 +359,7 @@ static int taos_als_calibrate(struct iio_dev *indio_dev)
>  			!= (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
>  		dev_err(&chip->client->dev,
>  			"taos_als_calibrate failed: device not powered on with ADC enabled\n");
> -		return -1;
> +		return -ENODATA;
Hmm. Not sure about this as the error value.  Perhaps a simple -EINVAL?

Also, this is still eating the possible error returned directly by
i2c_smbus_read_byte - would you mind fixing that whilst we are here?
>  	}
>  
>  	ret = i2c_smbus_write_byte(chip->client,
> @@ -569,7 +569,7 @@ static ssize_t taos_gain_store(struct device *dev,
>  		break;
>  	default:
>  		dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
> -		return -1;
> +		return -EINVAL;
>  	}
>  
>  	return len;
>