Re: [PATCH v2 05/11] iio: adc: ti-ads1015: don't return invalid value from buffer setup callbacks

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 21 Jul 2017 00:24:21 +0900
Akinobu Mita <akinobu.mita@gmail.com> wrote:

> pm_runtime_get_sync() and pm_runtime_put_autosuspend() return 0 on
> success, 1 if the device's runtime PM status was already requested status
> or error code on failure.  So a positive return value doesn't indicate an
> error condition.
> 
> However, any non-zero return values from buffer preenable and postdisable
> callbacks are recognized as an error and this driver reuses the return
> value from pm_runtime_get_sync() and pm_runtime_put_autosuspend() in
> these callbacks.  This change fixes the false error detections.
> 
> Cc: Daniel Baluta <daniel.baluta@gmail.com>
> Cc: Jonathan Cameron <jic23@kernel.org>
> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Applied to the togreg branch of iio.git and marked for stable.

Thanks,

Jonathan
> ---
>  drivers/iio/adc/ti-ads1015.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
> index 8905f0d..1c475e2 100644
> --- a/drivers/iio/adc/ti-ads1015.c
> +++ b/drivers/iio/adc/ti-ads1015.c
> @@ -235,7 +235,7 @@ static int ads1015_set_power_state(struct ads1015_data *data, bool on)
>  		ret = pm_runtime_put_autosuspend(dev);
>  	}
>  
> -	return ret;
> +	return ret < 0 ? ret : 0;
>  }
>  
>  static