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

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Message-ID: <20131014225933.GF7446@radagast>
Date:	Mon, 14 Oct 2013 17:59:33 -0500
From:	Felipe Balbi <balbi@...com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	<balbi@...com>, <rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<ijc+devicetree@...lion.org.uk>, <rob@...dley.net>,
	<davidb@...eaurora.org>, <dwalker@...o99.com>,
	<bryanh@...eaurora.org>, <linux@....linux.org.uk>,
	<gregkh@...uxfoundation.org>, <grant.likely@...aro.org>,
	<jackp@...eaurora.org>, <mgautam@...eaurora.org>,
	<dsegal@...eaurora.org>, <linux-usb@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 12/13] usb: phy: msm: Properly check core interrupt
 number

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.

> 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.

-- 
balbi

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