linux-kernel - Re: [PATCH v2 4/8] iio: inkern: return valid type on raw to processed conversion

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Date:   Wed, 9 Jun 2021 21:32:47 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Liam Beguin <liambeguin@...il.com>
Cc:     peda@...ntia.se, lars@...afoo.de, pmeerw@...erw.net,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org
Subject: Re: [PATCH v2 4/8] iio: inkern: return valid type on raw to
 processed conversion

On Mon,  7 Jun 2021 10:47:14 -0400
Liam Beguin <liambeguin@...il.com> wrote:

> From: Liam Beguin <lvb@...hos.com>
> 
> iio_convert_raw_to_processed_unlocked() applies the offset and scale of
> a channel on it's raw value.
> The processed value returned is always an integer. Return IIO_VAL_INT so
> that consumers can use this return value directly.
> 
> Signed-off-by: Liam Beguin <lvb@...hos.com>
This looks likely to cause breakage given that return value will go to
consumers directly via iio_convert_raw_to_processed()

Looks like this will break lmp91000 which checks for error as

if (ret)

> ---
>  drivers/iio/inkern.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
> index 0b5667f22b1d..00d234e87234 100644
> --- a/drivers/iio/inkern.c
> +++ b/drivers/iio/inkern.c
> @@ -618,7 +618,7 @@ static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,
>  		 * raw value and return.
>  		 */
>  		*processed = raw * scale;
> -		return 0;
> +		return IIO_VAL_INT;
>  	}
>  
>  	switch (scale_type) {
> @@ -652,7 +652,7 @@ static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan,
>  		return -EINVAL;
>  	}
>  
> -	return 0;
> +	return IIO_VAL_INT;
>  }
>  
>  int iio_convert_raw_to_processed(struct iio_channel *chan, int raw,