linux-kernel - Re: [PATCH 01/12] usb: mtu3: fix error return code in ssusb_gadget

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Date:   Mon, 9 Oct 2017 09:18:43 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Rob Herring <robh+dt@...nel.org>,
        "Mathias Nyman" <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 01/12] usb: mtu3: fix error return code in
 ssusb_gadget_init()

On Sat, 2017-09-30 at 16:00 +0300, Sergei Shtylyov wrote:
> Hello!
> 
> On 9/28/2017 3:17 AM, Chunfeng Yun wrote:
> 
> > When fail to get irq number, platform_get_irq() may return
> 
>     Failing. IRQ. :-)
I'll modify it, thank you

> 
> > -EPROBE_DEFER, but we ignore it and always return -ENODEV,
> > so fix it.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >   drivers/usb/mtu3/mtu3_core.c |    4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
> > index 99c65b0..9475798 100644
> > --- a/drivers/usb/mtu3/mtu3_core.c
> > +++ b/drivers/usb/mtu3/mtu3_core.c
> > @@ -774,9 +774,9 @@ int ssusb_gadget_init(struct ssusb_mtk *ssusb)
> >   		return -ENOMEM;
> >   
> >   	mtu->irq = platform_get_irq(pdev, 0);
> > -	if (mtu->irq <= 0) {
> > +	if (mtu->irq < 0) {
> 
>     This is good as the function no longer returns 0 on error. Even when it 
> did, 0 could mean a valid IRQ as well...
> 
> >   		dev_err(dev, "fail to get irq number\n");
> > -		return -ENODEV;
> > +		return mtu->irq;
> >   	}
> >   	dev_info(dev, "irq %d\n", mtu->irq);
> >   
> 
> MBR, Sergei