greybus: loopback: add gb_loopback_operation_sync
In order to extract timestamps from gb_message instead of gb_connection we will need access to the gb_operation structure. A first step to that is to create our own gb_loopback_operation_sync which will call gb_operation_request_send_sync() directly. Once loopback is using this function internally it will be possible to convert to gb_message based timestamps and drop gb_connection based timestamps in two seperate patches. Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Reviewed-by: Patrick Titiano <ptitiano@baylibre.com> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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