Re: [PATCH v11 7/8] serial: 8250: retire canceled RX DMA before reusing the receive buffer

[Raul E Rangel]

On Mon, Nov 09, 2026 at 09:00:22PM -0700, James Hilliard wrote:
> After one second of unsuccessful pause retries, stop the transfer with
> dmaengine_terminate_sync() outside the port lock. An indefinite wait could
> otherwise leave a request/response peer waiting for data that is stuck in
> a partial DMA buffer. Report that recovery discards the pending payload:
> without a stable residue it cannot safely be copied. Keep rx_running,
> rx_pause_pending and rx_terminating set until termination has stopped DMA
> and drained its callbacks. Then restore receive handling and allow another
> DMA descriptor, without latching a permanent PIO fallback for a pause
> timeout. This trades the stalled transfer's data for continued reception.

Reviewed-by: Raul E Rangel <rrangel@xxxxxxxxxxxx>