While the .flush_buffer() callback clears sci_port.tx_dma_len since commit 1cf4a7efdc71cab8 ("serial: sh-sci: Fix race condition causing garbage during shutdown"), it does not terminate a transmit DMA operation that may be in progress.
Fix this by terminating any pending DMA operations, and resetting the corresponding cookie.
What is the impact of the bug? DMA running during reboot, but not doing any harm?
Anyway, this looks okay to me.
Best regards, Pavel
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