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

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Date: Mon, 15 Apr 2024 10:48:02 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
Cc: davem@...emloft.net, edumazet@...gle.com, jarkko.palviainen@...il.com,
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
 netdev@...r.kernel.org, pabeni@...hat.com, stable@...r.kernel.org
Subject: Re: [PATCH] net: usb: ax88179_178a: avoid writing the mac address
 before first reading

On Mon, 15 Apr 2024 09:27:32 +0200 Jose Ignacio Tornos Martinez wrote:
> The issue happened at the initialization stage. At that moment, during
> normal rtnl_setlink call, the mac address is set and written in the device
> registers, but since the reset was not commanded previously, the mac
> address is not read from the device and without that, it always has the
> random address that is pre-generated just in case. 
> After this, during open operation, the reset is commanded and the mac
> address is read, but as the device registers were modified, it reads the
> pregenerated random mac address and not the default mac address for the
> device.

Oh, I see, why don't we issue the reset and probe time, then?