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

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Date:   Mon, 3 Jun 2019 13:03:40 +0000
From:   Fabien DESSENNE <fabien.dessenne@...com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        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-media@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.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

Hi Hans


"platform_get_irq() = 0" shall be considered as an error. See these 
discussions:
https://patchwork.kernel.org/patch/10006651/
https://yarchive.net/comp/linux/zero.html

BR

Fabien

On 03/06/2019 1:45 PM, Hans Verkuil wrote:
> 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);
>>