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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Youngmin Nam <youngmin.nam@samsung.com>, Greg KH <gregkh@linuxfoundation.org>
Cc: rafael@kernel.org, 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
Subject: Re: [BUG] mutex deadlock of dpm_resume() in low memory situation
Date: Wed, 27 Dec 2023 19:58:26 +0100
Message-ID: <5755916.DvuYhMxLoT@kreacher>
In-Reply-To: <5754861.DvuYhMxLoT@kreacher>
References: <CGME20231227084252epcas2p3b063f7852f81f82cd0a31afd7f404db4@epcas2p3.samsung.com> <2023122701-mortify-deed-4e66@gregkh> <5754861.DvuYhMxLoT@kreacher>
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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.