On Tue, Sep 09, 2025 at 04:56:45PM -0700, Jakub Kicinski wrote:
> On Tue, 9 Sep 2025 09:17:17 +0200 Oleksij Rempel wrote:
> > > > Fixes: e0bffe3e6894 ("net: asix: ax88772: migrate to phylink")
> > >
> > > It does, but v5.15 (including v5.15.191 LTS) is affected as well, from
> > > 4a2c7217cd5a ("net: usb: asix: ax88772: manage PHY PM from MAC"). I think
> > > it could also use a patch, but I won't insist.
> >
> > Ack, I'll try do address it later.
>
> Any idea what the problem is there? Deadlocking on a different lock?
Yes, it is PM lock taken in MDIO access inside of PM routine. We can't
reliably detect a PM context from MDIO bus read/write calls. Taking
local counters or setting flags would partially work, but they all are
not safe against race conditions.
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
