linux-kernel - Re: [PATCH v3 2/5] PM: sleep: Suspend async parents after suspending children

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Message-ID: <CAJZ5v0gTRtPzrROdkxRjTeXv4BsRyUkyGpCWmh-gHNx3X2L9RA@mail.gmail.com>
Date: Tue, 3 Jun 2025 15:04:33 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Chris Bainbridge <chris.bainbridge@...il.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Mario Limonciello <superm1@...nel.org>, 
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Linux PM <linux-pm@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, Alan Stern <stern@...land.harvard.edu>, 
	Ulf Hansson <ulf.hansson@...aro.org>, Johan Hovold <johan@...nel.org>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Jon Hunter <jonathanh@...dia.com>, 
	Saravana Kannan <saravanak@...gle.com>, amd-gfx@...ts.freedesktop.org
Subject: Re: [PATCH v3 2/5] PM: sleep: Suspend async parents after suspending children

On Tue, Jun 3, 2025 at 2:27 PM Chris Bainbridge
<chris.bainbridge@...il.com> wrote:
>
> On Tue, 3 Jun 2025 at 13:24, Rafael J. Wysocki <rafael@...nel.org> wrote:
> > >
> > > This patch does fix the list corruption, but the "Unbalanced
> > > pm_runtime_enable" still occurs:
> >
> > Have you applied it together with the previous patch?
>
> Yes

So it looks like some devices have power.is_suspended set from the
previous cycle which causes device_resume() to attempt to resume them
even though they have not been suspended in the current cycle yet.

Please try the attached patch in addition to the previous 2 patches.

Thanks!

View attachment "pm-sleep-is_suspended-cleanup.patch" of type "text/x-patch" (544 bytes)