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Manually add sysfs groups after the faux_device_ops's probe succeeds. Likewise remove these groups just before calling the faux_devices_ops's remove callback. This approach approximates the order in which the driver core adds and removes the driver's .dev_groups of a device to avoid lifetime issues. This is done specifically to avoid using the device's .groups member, which adds groups before the device is even registered to the bus. This lets consumers of this API, initialize resources on the .probe callback and then use them inside is_visible/show/store methods, through dev_get_drvdata() without races. Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Danilo Krummrich <dakr@kernel.org> Signed-off-by: Kurt Borja <kuurtb@gmail.com> Link: https://lore.kernel.org/r/20250327-faux-groups-v2-1-745a3cf0bc16@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>