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

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Date: Wed, 3 Jan 2024 13:39:17 +0900
From: Youngmin Nam <youngmin.nam@...sung.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, "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, hs.gil@...sung.com,
	yulgon.kim@...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 Tue, Jan 02, 2024 at 02:18:43PM +0100, Rafael J. Wysocki wrote:
> 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!
> 
Hi Rafael

We haven't seen any regression issue under our stress test.

So, feel free to add

Tested-by: Youngmin Nam <youngmin.nam@...sung.com>

Thanks.