Re: [PATCH v2 20/27] iio: addac: ad74413r: Stop using iio_device_claim_direct_scoped()

["Nuno Sá" <noname.nuno@gmail.com>]

On Sun, 2025-02-09 at 18:06 +0000, Jonathan Cameron wrote:
> From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> 
> This complex cleanup.h use case of conditional guards has proved
> to be more trouble that it is worth in terms of false positive compiler
> warnings and hard to read code.
> 
> Move directly to the new claim/release_direct() that allow sparse
> to check for unbalanced context. Includes moving a mutex lock
> into a function rather than around it to simplify the error handling.
> 
> Cc: Nuno Sa <nuno.sa@analog.com>
> Reviewed-by: David Lechner <dlechner@baylibre.com>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---

Reviewed-by: Nuno Sa <nuno.sa@analog.com>

>  drivers/iio/addac/ad74413r.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iio/addac/ad74413r.c b/drivers/iio/addac/ad74413r.c
> index daea2bde7acf..f14d12b03da6 100644
> --- a/drivers/iio/addac/ad74413r.c
> +++ b/drivers/iio/addac/ad74413r.c
> @@ -826,6 +826,8 @@ static int _ad74413r_get_single_adc_result(struct
> ad74413r_state *st,
>  	unsigned int uval;
>  	int ret;
>  
> +	guard(mutex)(&st->lock);
> +
>  	reinit_completion(&st->adc_data_completion);
>  
>  	ret = ad74413r_set_adc_channel_enable(st, channel, true);
> @@ -865,12 +867,14 @@ static int ad74413r_get_single_adc_result(struct iio_dev
> *indio_dev,
>  					  unsigned int channel, int *val)
>  {
>  	struct ad74413r_state *st = iio_priv(indio_dev);
> +	int ret;
>  
> -	iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
> -		guard(mutex)(&st->lock);
> -		return _ad74413r_get_single_adc_result(st, channel, val);
> -	}
> -	unreachable();
> +	if (!iio_device_claim_direct(indio_dev))
> +		return -EBUSY;
> +
> +	ret = _ad74413r_get_single_adc_result(st, channel, val);
> +	iio_device_release_direct(indio_dev);
> +	return ret;
>  }
>  
>  static void ad74413r_adc_to_resistance_result(int adc_result, int *val)