This series reworks STM32 USART DMA TX state management, and fix flow control.

Valentin Caron (4):
  serial: stm32: move tx dma terminate DMA to shutdown
  serial: stm32: rework TX DMA state condition
  serial: stm32: fix flow control transfer in DMA mode
  serial: stm32: correct loop for dma error handling

 drivers/tty/serial/stm32-usart.c | 74 ++++++++++++++++++++++++--------
 drivers/tty/serial/stm32-usart.h |  2 +-
 2 files changed, 56 insertions(+), 20 deletions(-)

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2.17.1