serial: imx: remove the DMA wait queue

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The DMA wait queue makes the code very complicated:
  For RX, the @->stop_rx hook does not really stop the RX;
  For TX, the @->stop_tx hook does not really stop the TX.

The above make the imx_shutdown has to wait the RX/TX DMA to be finished.

In order to make code more simple, this patch removes the DMA wait queue.
By calling the dmaengine_terminate_all, this patch makes the RX stops
immediately after we call the @->stop_rx hook, so does the TX.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Huang Shijie 2014-05-23 12:40:40 +08:00 • committed by Greg Kroah-Hartman

parent 8eccd0cd21

commit e2f2786606

1 changed files with 14 additions and 28 deletions

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drivers/tty/serial/imx.c

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