linux-kernel - Re: PCI: Race condition in pci_create_sysfs_dev

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Message-ID: <m3o83dvb3n.fsf@t19.piap.pl>
Date:   Fri, 11 Feb 2022 13:31:08 +0100
From:   Krzysztof Hałasa <khalasa@...p.pl>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Pali Rohár <pali@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Koen Vandeputte <koen.vandeputte@...ymesh.com>,
        Dexuan Cui <dexuan.linux@...il.com>
Subject: Re: PCI: Race condition in pci_create_sysfs_dev_files (can't boot)

Bjorn,

> Krzysztof, you're running v5.14, which includes Krzysztof W's work,
> but that shouldn't affect the imx6_pcie_probe()/pci_sysfs_init()
> ordering.  Your log shows the error in imx6_pcie_probe().
>
> Would you mind adding the patch below and attaching a complete dmesg
> log to the bugzilla?

Sure. In fact I was using 5.16-rc4 (with the media tree) lately, without
the fix from the other Krzysztof, and, as I can now see, it worked
without the problem in question.

I switched it to 5.14 I was using previously, reverted the fix, added
your patch, and tried again. It booted 100+ times without experiencing
the problem, too.

I will try again with the previous 5.14-rc3+ (which needed the fix) next
week. Perhaps it was an unrelated bug affecting 5.14-rc only (fixed
before final 5.14)? I haven't checked back then if 5.14 needed the fix,
most probably I've simply rebased from rc3+ to final.

The other possibility is changed .config. Or, I don't know, the gcc
versions. We will see.
-- 
Krzysztof "Chris" Hałasa

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