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@xxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxx/
Best regards,
Pavel
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