Re: [PATCH] iio: adc: sophgo-saradc: Handle errors from optional IRQ lookup

[Jonathan Cameron <jic23@kernel.org>]

On Thu, 13 Aug 2026 14:48:10 +0700
phucduc.bui@gmail.com wrote:

> From: bui duc phuc <phucduc.bui@gmail.com>
> 
> platform_get_irq_optional() returns a positive IRQ number on success or
> a negative error code on failure. For an optional IRQ, -ENXIO indicates
> that no optional IRQ is available. Other errors, such as -EPROBE_DEFER
> and -EINVAL, should be propagated so that the caller can handle them
> appropriately.

That function is very much undocumented other than not printing a
message when it returns an error.  However I think you analysis is
correct.

I'm not going to rush this is because it is not known to have
been a problem in the wild (only odd loading orders should have
caused deferal).


> 
> Propagate negative errors other than -ENXIO.
> 
> Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
> ---
>  drivers/iio/adc/sophgo-cv1800b-adc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/iio/adc/sophgo-cv1800b-adc.c b/drivers/iio/adc/sophgo-cv1800b-adc.c
> index bdc3e1326a9a..c6eed09acfcd 100644
> --- a/drivers/iio/adc/sophgo-cv1800b-adc.c
> +++ b/drivers/iio/adc/sophgo-cv1800b-adc.c
> @@ -182,6 +182,8 @@ static int cv1800b_adc_probe(struct platform_device *pdev)
>  		return PTR_ERR(saradc->regs);
>  
>  	saradc->irq = platform_get_irq_optional(pdev, 0);
> +	if (saradc->irq < 0 && saradc->irq != -ENXIO)
> +		return saradc->irq;
>  	if (saradc->irq > 0) {
>  		init_completion(&saradc->completion);
>  		ret = devm_request_irq(dev, saradc->irq,