linux-kernel - Re: diagnosing resume failures after disconnected USB4 drives (Was: Re: PCI/ASPM: Fix L1SS saving (linus/master commit 7507eb3e7bfac))

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Message-ID: <Z77ak-4YsdAKXbHr@wunner.de>
Date: Wed, 26 Feb 2025 10:10:43 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: Kenneth Crudup <kenny@...ix.com>, Bjorn Helgaas <helgaas@...nel.org>,
	ilpo.jarvinen@...ux.intel.com, Bjorn Helgaas <bhelgaas@...gle.com>,
	Jian-Hong Pan <jhp@...lessos.org>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Nikl??vs Ko??es??ikovs <pinkflames.linux@...il.com>,
	Andreas Noever <andreas.noever@...il.com>,
	Michael Jamet <michael.jamet@...el.com>,
	Yehezkel Bernat <YehezkelShB@...il.com>, linux-usb@...r.kernel.org
Subject: Re: diagnosing resume failures after disconnected USB4 drives (Was:
 Re: PCI/ASPM: Fix L1SS saving (linus/master commit 7507eb3e7bfac))

On Wed, Feb 26, 2025 at 10:44:04AM +0200, Mika Westerberg wrote:
>   [Meteor Lake host] <--> [TB 4 dock] <--> [TB 3 NVMe]
[...]
> I added "no_console_suspend" to the command line and the did sysrq-w to
> get list of blocked tasks. I've attached it just in case it is needed.
[...]

This looks like the deadlock we've had for years when hot-removing
nested hotplug ports.

If you attach only a single device to the host, I guess the issue
does not occur, right?

Previous attempts to fix this:

https://lore.kernel.org/all/4c882e25194ba8282b78fe963fec8faae7cf23eb.1529173804.git.lukas@wunner.de/

https://lore.kernel.org/all/20240612181625.3604512-1-kbusch@meta.com/

Thanks,

Lukas