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From: "Michał Pecio" <michal.pecio@gmail.com>
To: linux-pci@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-kernel@vger.kernel.org, regressions@lists.linux.dev
Subject: [REGRESSION 6.14] Some PCI device BARs inacessible
Date: Fri, 18 Apr 2025 10:29:26 +0200	[thread overview]
Message-ID: <20250418102926.690ac42c@foxbook> (raw)

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

             reply	other threads:[~2025-04-18  8:29 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-04-18  8:29 Michał Pecio [this message]
2025-04-18 16:46 ` [REGRESSION 6.14] Some PCI device BARs inacessible Bjorn Helgaas
2026-03-16 20:16 ` Bjorn Helgaas
2026-03-17 11:47   ` Ilpo Järvinen

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