linux-kernel - Re: [REGRESSION] net: usb: asix: deadlock on interface setup

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Message-ID: <aLfkOyYFY5ZGG6lZ@pengutronix.de>
Date: Wed, 3 Sep 2025 08:46:19 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Oleksij Rempel <linux@...pel-privat.de>,
	Hubert Wiśniewski <hubert.wisniewski.25632@...il.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	linux-usb@...r.kernel.org, netdev@...r.kernel.org,
	regressions@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] net: usb: asix: deadlock on interface setup

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.

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