linux-kernel - Re: [PATCH] media: stm32-dcmi: fix irq = 0 case

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Date:   Mon, 3 Jun 2019 13:45:27 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Fabien Dessenne <fabien.dessenne@...com>,
        Hugues Fruchet <hugues.fruchet@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Pavel Machek <pavel@...x.de>, linux-media@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH] media: stm32-dcmi: fix irq = 0 case

On 5/31/19 11:18 AM, Fabien Dessenne wrote:
> Manage the irq = 0 case, where we shall return an error.
> 
> Fixes: b5b5a27bee58 ("media: stm32-dcmi: return appropriate error codes during probe")
> Signed-off-by: Fabien Dessenne <fabien.dessenne@...com>
> ---
>  drivers/media/platform/stm32/stm32-dcmi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
> index b9dad0a..d855e9c 100644
> --- a/drivers/media/platform/stm32/stm32-dcmi.c
> +++ b/drivers/media/platform/stm32/stm32-dcmi.c
> @@ -1702,7 +1702,7 @@ static int dcmi_probe(struct platform_device *pdev)
>  	if (irq <= 0) {

Shouldn't this be 'irq < 0' instead of '<=' ?

AFAICT irq == 0 can be a valid irq and isn't an error.

Regards,

	Hans

>  		if (irq != -EPROBE_DEFER)
>  			dev_err(&pdev->dev, "Could not get irq\n");
> -		return irq;
> +		return irq ? irq : -ENXIO;
>  	}
>  
>  	dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>