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Date: Fri, 18 Apr 2025 11:46:56 -0500
From: Bjorn Helgaas <helgaas@kernel.org>
To: =?utf-8?Q?Micha=C5=82?= Pecio <michal.pecio@gmail.com>
Cc: linux-pci@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
	linux-kernel@vger.kernel.org, regressions@lists.linux.dev,
	Ilpo =?utf-8?B?SsOkcnZpbmVu?= <ilpo.jarvinen@linux.intel.com>,
	Joe Doss <joe@solidadmin.com>
Subject: Re: [REGRESSION 6.14] Some PCI device BARs inacessible
Message-ID: <20250418164656.GA160194@bhelgaas>
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[+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