netdev - Re: [PATCH 1/1] r8152: Add Lenovo Powered USB-C Travel Hub

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Message-ID: <87bldye9f4.fsf@is.currently.online>
Date:   Sat, 09 Jan 2021 10:39:27 +0100
From:   Leon Schuermann <leon@...currently.online>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     oliver@...kum.org, davem@...emloft.net, hayeswang@...ltek.com,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] r8152: Add Lenovo Powered USB-C Travel Hub

Jakub Kicinski <kuba@...nel.org> writes:
> On Fri,  8 Jan 2021 21:27:27 +0100 Leon Schuermann wrote:
>> This USB-C Hub (17ef:721e) based on the Realtek RTL8153B chip used to
>> work with the cdc_ether driver.
>
> When you say "used to work" do you mean there was a regression where
> the older kernels would work fine and newer don't? Or just "it works
> most of the time"?

Sorry, I should've clarified that. "Used to work" is supposed to say
"the device used the generic cdc_ether driver", as in

[  +0.000004] usb 4-1.1: Product: Lenovo Powered Hub
[  +0.000003] usb 4-1.1: Manufacturer: Lenovo
[  +0.000002] usb 4-1.1: SerialNumber: xxxxxxxxx
[  +0.024803] cdc_ether 4-1.1:2.0 eth0: register 'cdc_ether' at
              usb-0000:2f:00.0-1.1, CDC Ethernet Device,
              xx:xx:xx:xx:xx:xx

I guess it did technically work correctly, except for the reported issue
when the host system suspends, which is fixed by using the dedicated
Realtek driver. As far as I know this hasn't been fixed before, so it's
not a regression.

Should I update the commit message accordingly? Thanks!

Leon