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SYNC_STATE_ONLY device links only affect the behavior of sync_state() callbacks. Specifically, they prevent sync_state() only callbacks from being called on a device if one or more of its consumers haven't probed. So, creating a SYNC_STATE_ONLY device link from an already probed consumer is useless. So, don't allow creating such device links. Signed-off-by: Saravana Kannan <saravanak@google.com> Link: https://lore.kernel.org/r/20201121020232.908850-10-saravanak@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>