netdev - Regression with commit e532a096be0e ("net: usb: asix: ax88772: add phylib support")

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Date:   Wed, 11 Aug 2021 17:55:34 +0300
From:   Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:     Oleksij Rempel <linux@...pel-privat.de>
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>
Subject: Regression with commit e532a096be0e ("net: usb: asix: ax88772: add
 phylib support")

Hi

Our ASIX USB ethernet adapter stopped working after v5.14-rc1. It 
doesn't get an IP from DHCP.

v5.13 works ok. v5.14-rc1 and today's head 761c6d7ec820 ("Merge tag 
'arc-5.14-rc6' of 
git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc") show the 
regression.

I bisected regression into e532a096be0e ("net: usb: asix: ax88772: add 
phylib support").

Here's the dmesg snippet from working and non-working cases:

OK:
[    6.115773] asix 1-8:1.0 eth0: register 'asix' at usb-0000:00:14.0-8, 
ASIX AX88772 USB 2.0 Ethernet, 00:10:60:31:d5:f8
[    8.595202] asix 1-8:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC1E1

NOK:
[    6.511543] asix 1-8:1.0 eth0: register 'asix' at usb-0000:00:14.0-8, 
ASIX AX88772 USB 2.0 Ethernet, 00:10:60:31:d5:f8
[    8.518219] asix 1-8:1.0 eth0: Link is Down

lsusb -d 0b95:7720
Bus 001 Device 002: ID 0b95:7720 ASIX Electronics Corp. AX88772

Jarkko