Fix two races in DMA Rx completion and rearm handling.

I know in advance that the first patch will not be backport friendly
because of commit 56dc5074cbec ("serial: 8250_dma: Rearm DMA Rx if more
data is pending") that is not even in 6.1 but I can create the custom
backport on request.

Cc: stable@vger.kernel.org

Ilpo Järvinen (2):
  serial: 8250_dma: Fix DMA Rx completion race
  serial: 8250_dma: Fix DMA Rx rearm race

 drivers/tty/serial/8250/8250_dma.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

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2.30.2