serial: sh-sci: Do not terminate DMA engine when race condition occurs
When DMA packet completion and timer expiry take place at the same time, do not terminate the DMA engine, leading by submission of new descriptors, as the DMA communication hasn't necessarily stopped here. Signed-off-by: NMuhammad Hamza Farooq <mfarooq@visteon.com> Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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