Re: [PATCH v6 03/13] iio: inkern: Check error explicitly in iio_channel_read_max()

[Christophe Leroy]

Le 23/06/2023 à 10:58, Herve Codina a écrit :
> The current implementation returns the error code as part of the
> default switch case.
> This can lead to returning an incorrect positive value in case of
> iio_avail_type enum entries evolution.
> 
> In order to avoid this case, be more strict in error checking.
> 
> Signed-off-by: Herve Codina <herve.codina@xxxxxxxxxxx>
> Acked-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>

Reviewed-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>

> ---
>   drivers/iio/inkern.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
> index 872fd5c24147..f738db9a0c04 100644
> --- a/drivers/iio/inkern.c
> +++ b/drivers/iio/inkern.c
> @@ -858,6 +858,9 @@ static int iio_channel_read_max(struct iio_channel *chan,
>   		val2 = &unused;
>   
>   	ret = iio_channel_read_avail(chan, &vals, type, &length, info);
> +	if (ret < 0)
> +		return ret;
> +
>   	switch (ret) {
>   	case IIO_AVAIL_RANGE:
>   		switch (*type) {
> @@ -888,7 +891,7 @@ static int iio_channel_read_max(struct iio_channel *chan,
>   		return 0;
>   
>   	default:
> -		return ret;
> +		return -EINVAL;
>   	}
>   }
>