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

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Date:   Mon, 3 Jun 2019 15:08:10 +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-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

On 6/3/19 3:03 PM, Fabien DESSENNE wrote:
> 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

Hmm, then many media drivers are wrong since most check for < 0.

In any case, I'll pick up this patch whenever I make a next pull request
for fixes like this.

Regards,

	Hans

> 
> 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);
>> >