linux-kernel - RE: [PATCH] usb: cdns3: remove dead code

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Date:   Wed, 28 Sep 2022 06:40:04 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Dongliang Mu <dzm91@...t.edu.cn>,
        Peter Chen <peter.chen@...nel.org>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Dongliang Mu <mudongliangabcd@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: cdns3: remove dead code

>
>From: Dongliang Mu <mudongliangabcd@...il.com>
>
>Smatch reports the following error:
>
>drivers/usb/cdns3/cdns3-plat.c:113 cdns3_plat_probe() warn:
>platform_get_irq() does not return zero
>
>>From the document, platform_get_irq_byname_optional only returns
>non-zero value, and negative value on failure.
>
>Fix this by removing the zero value checking.
>
>Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
>---
> drivers/usb/cdns3/cdns3-plat.c | 2 --
> 1 file changed, 2 deletions(-)
>
>diff --git a/drivers/usb/cdns3/cdns3-plat.c b/drivers/usb/cdns3/cdns3-plat.c
>index dc068e940ed5..2bc5d094548b 100644
>--- a/drivers/usb/cdns3/cdns3-plat.c
>+++ b/drivers/usb/cdns3/cdns3-plat.c
>@@ -110,8 +110,6 @@ static int cdns3_plat_probe(struct platform_device *pdev)
> 	cdns->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
> 	if (cdns->wakeup_irq == -EPROBE_DEFER)
> 		return cdns->wakeup_irq;
>-	else if (cdns->wakeup_irq == 0)
>-		return -EINVAL;
>
I think that here we should have:
	else if (cdns->wakeup_irq == -ENXIO)
		return -EINVAL;
 because of function: 
platform_get_irq_byname_optional -> __platform_get_irq_byname returns
irq number (>0),  -EPROBE_DEFFER or -ENXIO


thanks
Pawel

> 	if (cdns->wakeup_irq < 0) {
> 		dev_dbg(dev, "couldn't get wakeup irq\n");
>--
>2.35.1