Re: [PATCH 2/2] watchdog: stm32_iwdg: Propagate -EPROBE_DEFER from IRQ lookup

[Guenter Roeck <linux@roeck-us.net>]

On 8/5/26 23:28, phucduc.bui@gmail.com wrote:
> From: bui duc phuc <phucduc.bui@gmail.com>
> 
> platform_get_irq_optional() does not returns 0. It returns a positive
> IRQ number on success or a negative error code on failure.
> 
> Return -EPROBE_DEFER from platform_get_irq_optional() so the driver is
> re-probed when the interrupt resource becomes available instead of
> continuing probe without an IRQ.
> 
> Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
> ---
>   drivers/watchdog/stm32_iwdg.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c
> index b356a272ff9a..102f51084957 100644
> --- a/drivers/watchdog/stm32_iwdg.c
> +++ b/drivers/watchdog/stm32_iwdg.c
> @@ -287,7 +287,9 @@ static int stm32_iwdg_irq_init(struct platform_device *pdev,
>   		return 0;
>   
>   	irq = platform_get_irq_optional(pdev, 0);
> -	if (irq <= 0)
> +	if (irq == -EPROBE_DEFER)
> +		return irq;
> +	if (irq < 0)
>   		return 0;

	if (irq < 0) {
		if (irq != -ENXIO)
			return irq;
		return 0;
	}

platform_get_irq_optional() does not return 0. and -ENXIO is returned
if there is no interrupt.

Guenter