linux-kernel - Re: [PATCH v2] PCI: pciehp: Fix system hang during resume with daisy-chained hotplug controllers

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Message-ID: <Z8nRzYOgTz86xRwN@wunner.de>
Date: Thu, 6 Mar 2025 17:48:13 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: "Chia-Lin Kao (AceLan)" <acelan.kao@...onical.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] PCI: pciehp: Fix system hang during resume with
 daisy-chained hotplug controllers

On Wed, Mar 05, 2025 at 05:09:59PM -0600, Bjorn Helgaas wrote:
> On Tue, Oct 22, 2024 at 09:02:43PM +0800, Chia-Lin Kao (AceLan) wrote:
> > A system hang occurs when multiple PCIe hotplug controllers in a daisy-chained
> > setup (like a Thunderbolt dock with NVMe storage) resume from system sleep.

Thanks Bjorn for reminding me of AceLan's report.

This appears to be the same issue Mika and Kenneth reported,
a fix is currently being worked on in this thread:

https://lore.kernel.org/all/Z8nRI6xjGl3frMe5@wunner.de/