linux-kernel - Re: [PATCH 1/2] net: asix: add 0b95:1790 to AX88179A device list

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Date: Mon, 5 Feb 2024 15:03:45 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Christian Hewitt <christianshewitt@...il.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Grant Grundler <grundler@...omium.org>, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] net: asix: add 0b95:1790 to AX88179A device list

On Mon, Feb 05, 2024 at 10:40:48AM +0000, Christian Hewitt wrote:
> Add a generic AX88179A entry for the 0b95:1790 device id:
> 
> kernel: usb 2-1: New USB device found, idVendor=0b95, idProduct=1790, bcdDevice= 2.00
> kernel: usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> kernel: usb 2-1: Product: AX88179A
> kernel: usb 2-1: Manufacturer: ASIX
> kernel: usb 2-1: SerialNumber: 00D24DC0
> kernel: asix 2-1:1.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -32
> kernel: asix: probe of 2-1:1.0 failed with error -32
> kernel: ax88179_178a 2-1:1.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0040: -32
> kernel: ax88179_178a 2-1:1.0 eth1: register 'ax88179_178a' at usb-0000:01:00.0-1, ASIX AX88179 USB 3.0 Gigabit Ethernet, 20:7b:d2:d2:4d:c0
> 
> Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
> ---
> The change is tested by a LibreELEC (distro) user who reports the NIC to be working
> fine (and logs support this) but the "Failed to read reg index 0x0000: -32" errors
> suggest ax88178_info might not be the correct choice. I'm not a serious coder so I
> need to "ask the audience" for suggestions on what more might be needed?

I would probably start by determining what ax88179_read_cmd() is
causing that print. Maybe print in addition cmd, and value. Or add a
WARN() so you get a stack trace.

It might be possible to figure it out by just looking at the code. How
many places actually pass index=0?

       Andrew