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usb: core: Don't force USB generic_subclass drivers to define probe()

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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@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20231201102946.v2.1.I7ea0dd55ee2acdb48b0e6d28c1a704ab2c29206f@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Douglas Anderson
2023-12-01 10:29:50 -08:00
committed by Greg Kroah-Hartman
parent dadc0f0f7a
commit c2d95fcff0
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/core/driver.c
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@@ -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;