linux-kernel - Re: [PATCH v2 1/3] usb: core: Don't force USB generic

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Message-ID: <59c5c190-234c-42d4-9a44-eadba4b717f0@rowland.harvard.edu>
Date:   Fri, 1 Dec 2023 14:28:46 -0500
From:   Alan Stern <stern@...land.harvard.edu>
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>,
        Jakub Kicinski <kuba@...nel.org>,
        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>,
        Hans de Goede <hdegoede@...hat.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] usb: core: Don't force USB generic_subclass
 drivers to define probe()

On Fri, Dec 01, 2023 at 10:29:50AM -0800, Douglas Anderson wrote:
> There's no real reason that subclassed USB drivers _need_ to define
> probe() since they might want to subclass for some other reason. Make
> it optional to define probe() if we're a generic_subclass.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---

Reviewed-by: Alan Stern <stern@...land.harvard.edu>

> Changes in v2:
> - ("Don't force USB generic_subclass drivers to define ...") new for v2.
> 
>  drivers/usb/core/driver.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
> index f58a0299fb3b..1dc0c0413043 100644
> --- a/drivers/usb/core/driver.c
> +++ b/drivers/usb/core/driver.c
> @@ -290,7 +290,10 @@ static int usb_probe_device(struct device *dev)
>  	 * specialised device drivers prior to setting the
>  	 * use_generic_driver bit.
>  	 */
> -	error = udriver->probe(udev);
> +	if (udriver->probe)
> +		error = udriver->probe(udev);
> +	else if (!udriver->generic_subclass)
> +		error = -EINVAL;
>  	if (error == -ENODEV && udriver != &usb_generic_driver &&
>  	    (udriver->id_table || udriver->match)) {
>  		udev->use_generic_driver = 1;
> -- 
> 2.43.0.rc2.451.g8631bc7472-goog
>