linux-kernel - Re: [PATCH] usb: misc: eud: Fix missing IRQ check in eud

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Date:   Sat, 26 Aug 2023 22:17:42 +0800
From:   Zhang Shurong <zhang_shurong@...mail.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     quic_schowdhu@...cinc.com, agross@...nel.org, andersson@...nel.org,
        gregkh@...uxfoundation.org, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: misc: eud: Fix missing IRQ check in eud_probe()

在 2023年8月26日星期六 CST 下午6:49:27，Konrad Dybcio 写道：
> On 26.08.2023 12:47, Zhang Shurong wrote:
> > This func misses checking for platform_get_irq()'s call and may passes the
> > negative error codes to request_irq(), which takes unsigned IRQ #,
> > causing it to fail with -EINVAL, overriding an original error code.
> > 
> > Fix this by stop calling request_irq() with invalid IRQ #s.
> > 
> > Fixes: 9a1bf58ccd44 ("usb: misc: eud: Add driver support for Embedded USB
> > Debugger(EUD)") Signed-off-by: Zhang Shurong <zhang_shurong@...mail.com>
> > ---
> > 
> >  drivers/usb/misc/qcom_eud.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/misc/qcom_eud.c b/drivers/usb/misc/qcom_eud.c
> > index 7f371ea1248c..b33c615a2037 100644
> > --- a/drivers/usb/misc/qcom_eud.c
> > +++ b/drivers/usb/misc/qcom_eud.c
> > @@ -204,7 +204,12 @@ static int eud_probe(struct platform_device *pdev)
> > 
> >  	if (IS_ERR(chip->mode_mgr))
> >  	
> >  		return PTR_ERR(chip->mode_mgr);
> > 
> > -	chip->irq = platform_get_irq(pdev, 0);
> > +	ret = platform_get_irq(pdev, 0);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	chip->irq = ret;chip->irq = plat..
> 
> if (chip->irq < 0)
> 	return chip->irq
> 
> ?
> 
> Konrad
Thank you for your thoughtful response. To clarify, are you suggesting that I 
replace the usage of `ret` with `chip->irq`? If that is the case, I will 
proceed with creating a patch for version 2.