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From: "Rafael J. Wysocki" <rafael@kernel.org>
Date: Wed, 27 Dec 2023 21:50:01 +0100
Message-ID: <CAJZ5v0jupWr_89mttKMg-KGa6_dpu62JiUkUaueMfHVgeUXYWg@mail.gmail.com>
Subject: Re: [BUG] mutex deadlock of dpm_resume() in low memory situation
To: Greg KH <gregkh@linuxfoundation.org>, Youngmin Nam <youngmin.nam@samsung.com>
Cc: len.brown@intel.com, pavel@ucw.cz, linux-pm@vger.kernel.org, 
	linux-kernel@vger.kernel.org, d7271.choe@samsung.com, 
	janghyuck.kim@samsung.com, hyesoo.yu@samsung.com, 
	"Rafael J. Wysocki" <rjw@rjwysocki.net>
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On Wed, Dec 27, 2023 at 7:58=E2=80=AFPM Rafael J. Wysocki <rjw@rjwysocki.ne=
t> wrote:
>
> On Wednesday, December 27, 2023 7:39:20 PM CET Rafael J. Wysocki wrote:
> > On Wednesday, December 27, 2023 5:08:40 PM CET Greg KH wrote:
> > > On Wed, Dec 27, 2023 at 05:42:50PM +0900, Youngmin Nam wrote:
> > > > Could you look into this issue ?
> > >
> > > Can you submit a patch that resolves the issue for you, as you have a
> > > way to actually test this out?  That would be the quickest way to get=
 it
> > > resolved, and to help confirm that this is even an issue at all.
> >
> > Something like the appended patch should be sufficient to address this =
AFAICS.
> >
> > I haven't tested it yet (will do so shortly), so all of the usual discl=
aimers
> > apply.
> >
> > I think that it can be split into 2 patches, but for easier testing her=
e
> > it goes in one piece.
>
> Well, please scratch this, it will not handle "async" devices properly.

This

https://lore.kernel.org/linux-pm/6019796.lOV4Wx5bFT@kreacher/

should address the issue properly (it has been lightly tested).

Please give it a go and let me know if it works for you (on top of 6.7-rc7)=
.