linux-kernel - Re: [BUG] mutex deadlock of dpm_resume() in low memory situation

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Message-ID: <5755916.DvuYhMxLoT@kreacher>
Date: Wed, 27 Dec 2023 19:58:26 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Youngmin Nam <youngmin.nam@...sung.com>, Greg KH <gregkh@...uxfoundation.org>
Cc: rafael@...nel.org, len.brown@...el.com, pavel@....cz, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, d7271.choe@...sung.com, janghyuck.kim@...sung.com, hyesoo.yu@...sung.com
Subject: Re: [BUG] mutex deadlock of dpm_resume() in low memory situation

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 disclaimers
> apply.
> 
> I think that it can be split into 2 patches, but for easier testing here
> it goes in one piece.

Well, please scratch this, it will not handle "async" devices properly.