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

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Message-ID: <CAJZ5v0j=7ePbEhW0+9WBGqgGhafGazyM-APr-ZRsweWDAQ76Vw@mail.gmail.com>
Date: Wed, 3 Jan 2024 11:28:21 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Youngmin Nam <youngmin.nam@...sung.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, 
	Greg KH <gregkh@...uxfoundation.org>, linux-pm@...r.kernel.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 Wed, Jan 3, 2024 at 5:39 AM Youngmin Nam <youngmin.nam@...sung.com> wrote:
>
> 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>

Thank you!