linux-kernel - Re: [PATCH v2] net: usb: ax88179_178a: avoid writing the mac address before first reading

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Date: Thu, 9 May 2024 16:09:16 -0500
From: Jeffery Miller <jefferymiller@...gle.com>
To: jtornosm@...hat.com
Cc: davem@...emloft.net, Eric Dumazet <edumazet@...gle.com>, inventor500@...aldi.net, 
	jarkko.palviainen@...il.com, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, 
	stable@...r.kernel.org, vadim.fedorenko@...ux.dev
Subject: Re: [PATCH v2] net: usb: ax88179_178a: avoid writing the mac address
 before first reading

Hello José,

I'm testing on the 6.6 kernel with a "0b95:1790 ASIX Electronics Corp.
AX88179 Gigabit Ethernet" device.
after applying commit 56f78615bcb1 ("net: usb: ax88179_178a: avoid
writing the mac address before first reading")
the network will no longer work after brining the device down.

After plugging in the device, it generally will work with ifconfig:
$ ifconfig eth0 <ip address>
However, if I then try bringing the devcie down and back up, it no longer works.
$ ifconfig eth0 down
$ ifconfig eth0  <ip address>
$ ethtool eth0 | grep detected
  Link detected: no

The link will continue to report as undetected.

If I revert 56f78615bcb1 the device will work after bringing it down
and back up.

If I build at commit d7a319889498 ("net: usb: ax88179_178a: avoid two
consecutive device resets") and its
parent d7a319889498^ these also work.

Is this something you have seen before with your test devices?

Regards,
Jeff