linux-kernel - Re: [REGRESSION 6.14] Some PCI device BARs inacessible

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Message-ID: <20250418164656.GA160194@bhelgaas>
Date: Fri, 18 Apr 2025 11:46:56 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Michał Pecio <michal.pecio@...il.com>
Cc: linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org, regressions@...ts.linux.dev,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Joe Doss <joe@...idadmin.com>
Subject: Re: [REGRESSION 6.14] Some PCI device BARs inacessible

[+cc Joe (reporter), Ilpo]
[+bcc Steven (another reporter, bcc since email hasn't been used publicly recently]

On Fri, Apr 18, 2025 at 10:29:26AM +0200, Michał Pecio wrote:
> This is a heads up that an apparent PCI regression has been reported
> and mistakenly assigned to USB in the kernel bugzilla:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=220016
> 
> Visible symptom is missing USB devices, but the whole controller fails
> to probe, apparently due to devm_request_mem_region() returning NULL,
> see drivers/usb/core/hcd-pci.c and usb_hcd_pci_probe().
> 
> Same systems also show a similar failure with some AHCI controller.
> It seems specific to particular ASUS AMD motherboards.
> 
> Somebody found that disabling CONFIG_PCI_REALLOC_ENABLE_AUTO helps.
> 
> That's all I know, reporters can be reached via bugzilla.

#regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=220016