linux-kernel - Re: [PATCH v3 12/13] usb: phy: msm: Properly check core interrupt number

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Date:	Tue, 15 Oct 2013 10:12:16 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	balbi@...com
Cc:	mark.rutland@....com, linux-doc@...r.kernel.org,
	dwalker@...o99.com, linux@....linux.org.uk, swarren@...dotorg.org,
	grant.likely@...aro.org, davidb@...eaurora.org,
	devicetree@...r.kernel.org, jackp@...eaurora.org,
	pawel.moll@....com, ijc+devicetree@...lion.org.uk,
	linux-arm-msm@...r.kernel.org, rob.herring@...xeda.com,
	linux-arm-kernel@...ts.infradead.org, dsegal@...eaurora.org,
	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, mgautam@...eaurora.org,
	bryanh@...eaurora.org, rob@...dley.net
Subject: Re: [PATCH v3 12/13] usb: phy: msm: Properly check core interrupt
 number

On Mon, 2013-10-14 at 17:59 -0500, Felipe Balbi wrote: 
> On Mon, Oct 14, 2013 at 06:24:39PM +0300, Ivan T. Ivanov wrote:
> > From: "Ivan T. Ivanov" <iivanov@...sol.com>
> > 
> > IRQ with number 0 is valid case, so check for negative
> 
> not entirelly correct... IRQ 0 isn't supposed to be used as a linux IRQ
> number IIRC.

I am not really sure. NO_IRQ is -1 at least on ARM. Also when
taking into account irqdomain's zero as interrupt number is valid??

> 
> > numbers instead.
> > 
> > Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> > ---
> >  drivers/usb/phy/phy-msm-usb.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
> > index ca2abe6..f34c8a9 100644
> > --- a/drivers/usb/phy/phy-msm-usb.c
> > +++ b/drivers/usb/phy/phy-msm-usb.c
> > @@ -1415,7 +1415,7 @@ static int __init msm_otg_probe(struct platform_device *pdev)
> >  	dev_info(&pdev->dev, "OTG regs = %p\n", motg->regs);
> >  
> >  	motg->irq = platform_get_irq(pdev, 0);
> > -	if (!motg->irq) {
> > +	if (motg->irq < 0) {
> 
> this check is correct though, since platform_get_irq() will return
> -ENXIO if it doesn't find IRQ resource.
> 

Thanks,
Ivan

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