linux-kernel - Re: [PATCH 4.19 041/133] Revert "usb/ohci-platform: Fix a warning when hibernating"

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Date:   Tue, 21 Jul 2020 13:29:08 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 4.19 041/133] Revert "usb/ohci-platform: Fix a warning
 when hibernating"

Hi!

> > > >After some investigations, we concluded the following:
> > > > - the issue does not exist in vanilla v5.8-rc4+
> > > > - [bisecting shows that] the panic on v4.14.186 is caused by the lack
> > > >   of v5.6-rc1 commit 987351e1ea7772 ("phy: core: Add consumer device
> > > >   link support"). Getting evidence for that is easy. Reverting
> > > >   987351e1ea7772 in vanilla leads to a similar backtrace [2].
> > > >
> > > >Questions:
> > > > - Backporting 987351e1ea7772 ("phy: core: Add consumer device
> > > >   link support") to v4.14.187 looks challenging enough, so probably not
> > > >   worth it. Anybody to contradict this?
> > 
> > I'm not sure about v4.14.187, but backport to v4.19 is quite simple
> > (just ignore single non-existing file) and passes basic testing.
> > 
> > Would that be better solution for 4.19 and newer?
> 
> If Eugeniu could confirm that doing so on 4.19+ works for him, sure.

He did:

Message-ID: <20200721065054.GA8290@...i-065.adit-jv.com>
Technically yes. Backporting 987351e1ea7772 to v4.19.x avoids the panic.
...
FWIW I confirm that:
* setup [A] leads to the issue reported in [C]
* setup [B] resolves the issue reported in [C]

[A] v4.19 + 16bdc04cc98 + 1cb3b0095c3 + 79112cc3c29f
[B] v4.19 + 16bdc04cc98 + 1cb3b0095c3 + 79112cc3c29f + 987351e1ea7
[C] https://lore.kernel.org/linux-usb/20200709070023.GA18414@lxhi-065.adit-jv.com/


Best regards,
								Pavel

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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