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

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Message-ID: <20231201102946.v2.1.I7ea0dd55ee2acdb48b0e6d28c1a704ab2c29206f@changeid>
Date:   Fri,  1 Dec 2023 10:29:50 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     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>
Cc:     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>,
        Douglas Anderson <dianders@...omium.org>,
        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: [PATCH v2 1/3] usb: core: Don't force USB generic_subclass drivers to define probe()

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>
---

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