Re: [PATCH 1/2] power: supply: lego_ev3_battery: Don't ignore iio_read_channel_processed() return value

[Sebastian Reichel]

Hi,

On Fri, Jul 20, 2018 at 03:19:43PM -0500, David Lechner wrote:
> This changes the LEGO MINDSTORMS EV3 power supply driver to return an
> error if iio_read_channel_processed() fails.
> 
> Signed-off-by: David Lechner <da...@lechnology.com>
> ---

Thanks, queued to power-supply's for-next branch.

-- Sebastian

>  drivers/power/supply/lego_ev3_battery.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/power/supply/lego_ev3_battery.c 
> b/drivers/power/supply/lego_ev3_battery.c
> index 7b993d669f7f..6e3b3e384172 100644
> --- a/drivers/power/supply/lego_ev3_battery.c
> +++ b/drivers/power/supply/lego_ev3_battery.c
> @@ -39,7 +39,7 @@ static int lego_ev3_battery_get_property(struct 
> power_supply *psy,
>                                        union power_supply_propval *val)
>  {
>       struct lego_ev3_battery *batt = power_supply_get_drvdata(psy);
> -     int val2;
> +     int ret, val2;
>  
>       switch (psp) {
>       case POWER_SUPPLY_PROP_TECHNOLOGY:
> @@ -47,11 +47,18 @@ static int lego_ev3_battery_get_property(struct 
> power_supply *psy,
>               break;
>       case POWER_SUPPLY_PROP_VOLTAGE_NOW:
>               /* battery voltage is iio channel * 2 + Vce of transistor */
> -             iio_read_channel_processed(batt->iio_v, &val->intval);
> +             ret = iio_read_channel_processed(batt->iio_v, &val->intval);
> +             if (ret)
> +                     return ret;
> +
>               val->intval *= 2000;
>               val->intval += 200000;
> +
>               /* plus adjust for shunt resistor drop */
> -             iio_read_channel_processed(batt->iio_i, &val2);
> +             ret = iio_read_channel_processed(batt->iio_i, &val2);
> +             if (ret)
> +                     return ret;
> +
>               val2 *= 1000;
>               val2 /= 15;
>               val->intval += val2;
> @@ -64,7 +71,10 @@ static int lego_ev3_battery_get_property(struct 
> power_supply *psy,
>               break;
>       case POWER_SUPPLY_PROP_CURRENT_NOW:
>               /* battery current is iio channel / 15 / 0.05 ohms */
> -             iio_read_channel_processed(batt->iio_i, &val->intval);
> +             ret = iio_read_channel_processed(batt->iio_i, &val->intval);
> +             if (ret)
> +                     return ret;
> +
>               val->intval *= 20000;
>               val->intval /= 15;
>               break;
> -- 
> 2.17.1
> 

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