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With DMA tunnels it is possible that the service using it does not require bi-directional paths so make RX and TX optional (but of course one of them needs to be set). Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>