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Save the current RX and TX DMA devices to avoid having to duplicate the logic to pick them, since we'll need access to them in some more functions to fix a bug in the cache handling. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Link: https://lore.kernel.org/r/20220927112117.77599-2-vincent.whitchurch@axis.com Signed-off-by: Mark Brown <broonie@kernel.org>