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

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Message-ID: <20250902163511.181fa76a@kernel.org>
Date: Tue, 2 Sep 2025 16:35:11 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: "Oleksij Rempel" <linux@...pel-privat.de>
Cc: 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 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?