linux-kernel - Re: [PATCH v1 0/3] PM: sleep: Fix possible device suspend-resume deadlocks

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Date: Tue, 2 Jan 2024 14:18:43 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Greg KH <gregkh@...uxfoundation.org>, linux-pm@...r.kernel.org, 
	Youngmin Nam <youngmin.nam@...sung.com>, rafael@...nel.org, linux-kernel@...r.kernel.org, 
	d7271.choe@...sung.com, janghyuck.kim@...sung.com, hyesoo.yu@...sung.com, 
	Alan Stern <stern@...land.harvard.edu>, Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v1 0/3] PM: sleep: Fix possible device suspend-resume deadlocks

On Wed, Dec 27, 2023 at 9:41 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
> Hi Everyone,
>
> As reported here
>
> https://lore.kernel.org/linux-pm/ZYvjiqX6EsL15moe@perf/
>
> the device suspend-resume code running during system-wide PM transitions
> deadlock on low memory, because it attempts to acquire a mutex that's
> already held by it in those cases.
>
> This series addresses the issue by changing the resume code behavior
> to directly run the device PM functions synchronously if they cannot
> be scheduled for asynchronous executions (patch [3/3]).
>
> For this purpose, the async code is rearranged (patch [1/3]) and a
> new variant of async_schedule_dev() is introduced (patch [2/3]).

Given the lack of negative feedback, I've queued up this series for 6.8-rc1.

Please let me know if there are any issues with that.

Thanks!