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

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Message-ID: <20250418102926.690ac42c@foxbook>
Date: Fri, 18 Apr 2025 10:29:26 +0200
From: Michał Pecio <michal.pecio@...il.com>
To: linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: [REGRESSION 6.14] Some PCI device BARs inacessible

Hi,

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.

Regards,
Michal