linux-kernel - Re: [PATCH 4/5] pci: handled return value of platform_get

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 12 Mar 2020 10:53:06 +0100
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Aman Sharma <amanharitsh123@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Karthikeyan Mitran <m.karthikeyan@...iveil.co.in>,
        Hou Zhiqiang <Zhiqiang.Hou@....com>,
        Mans Rullgard <mans@...sr.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 4/5] pci: handled return value of platform_get_irq
 correctly

On 11/03/2020 20:19, Aman Sharma wrote:

> diff --git a/drivers/pci/controller/pcie-tango.c b/drivers/pci/controller/pcie-tango.c
> index 21a208da3f59..18c2c4313eb5 100644
> --- a/drivers/pci/controller/pcie-tango.c
> +++ b/drivers/pci/controller/pcie-tango.c
> @@ -273,9 +273,9 @@ static int tango_pcie_probe(struct platform_device *pdev)
>  		writel_relaxed(0, pcie->base + SMP8759_ENABLE + offset);
>  
>  	virq = platform_get_irq(pdev, 1);
> -	if (virq <= 0) {
> +	if (virq < 0) {
>  		dev_err(dev, "Failed to map IRQ\n");
> -		return -ENXIO;
> +		return virq;
>  	}
>  
>  	irq_dom = irq_domain_create_linear(fwnode, MSI_MAX, &dom_ops, pcie);


Weee, here we go again :-)

https://patchwork.kernel.org/patch/11066455/
https://patchwork.kernel.org/patch/10006651/

Last time around, my understanding was that, going forward,
the best solution was:

	virq = platform_get_irq(...)
	if (virq <= 0)
		return virq ? : -ENODEV;

i.e. map 0 to -ENODEV, pass other errors as-is, remove the dev_err

@Bjorn/Lorenzo did you have a change of heart?

Regards.