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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>