linux-kernel - Re: [PATCH net v2 3/3] r8152: Choose our USB config with choose

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Message-ID: <20231204182740.62a49a14@kernel.org>
Date:   Mon, 4 Dec 2023 18:27:40 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     linux-usb@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Grant Grundler <grundler@...omium.org>,
        Hayes Wang <hayeswang@...ltek.com>,
        Simon Horman <horms@...nel.org>,
        Bjørn Mork <bjorn@...k.no>,
        netdev@...r.kernel.org, Brian Geffon <bgeffon@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2 3/3] r8152: Choose our USB config with
 choose_configuration() rather than probe()

On Fri,  1 Dec 2023 10:29:52 -0800 Douglas Anderson wrote:
> If you deauthorize the r8152 device (by writing 0 to the "authorized"
> field in sysfs) and then reauthorize it (by writing a 1) then it no
> longer works. This is because when you do the above we lose the
> special configuration that we set in rtl8152_cfgselector_probe().
> Deauthorizing causes the config to be set to -1 and then reauthorizing
> runs the default logic for choosing the best config.
> 
> I made an attempt to fix it so that the config is kept across
> deauthorizing / reauthorizing [1] but it was a bit ugly.
> 
> Let's instead use the new USB core feature to override
> choose_configuration().
> 
> This patch relies upon the patches ("usb: core: Don't force USB
> generic_subclass drivers to define probe()") and ("usb: core: Allow
> subclassed USB drivers to override usb_choose_configuration()")

Acked-by: Jakub Kicinski <kuba@...nel.org>