# Re: \[REGRESSION\] net: usb: asix: deadlock on interface setup

- From: Oleksij Rempel \<o.rempel@pengutronix.de\>
- Date: 2025-09-03 06:46:38 
- List: netdev
- Page: https://ratatoskr.run/netdev/2025/09/3198153
- Thread: https://ratatoskr.run/linux-usb/2025/08/3193895/t.md

```text
On Tue, Sep 02, 2025 at 04:35:11PM -0700, Jakub Kicinski wrote:
> On Sun, 31 Aug 2025 10:50:35 +0200 Hubert Wiśniewski wrote:
> > Trying to bring an AX88772B-based USB-Ethernet adapter up results in a
> > deadlock if the adapter was suspended at the time. Most network-related
> > software hangs up indefinitely as a result. This can happen on systems
> > which configure USB power control to 'auto' by default, e.g. laptops
> > running `tlp`.
>  
> Oleksij, this seems to date back to commit e0bffe3e6894 ("net: asix:
> ax88772: migrate to phylink"). Taking rtnl_lock in runtime resume
> callbacks is known to result in unhappiness :(
> 
> Could you check if commit e110bc825897 ("net: usb:
> lan78xx: Convert to PHYLINK for improved PHY and MAC management")
> isn't similarly flawed?

Yes, sorry for delay answer.  I'll investigate it at Friday.

-- 
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 |
```