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This is a preparatory for the serial-to-kfifo switch. kfifo understands only scatter-gatter approach, so switch to that. No functional change intended, it's just dmaengine_prep_slave_single() inline expanded. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20240405060826.2521-10-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>