From e2f2786606d49d3aae545c61c04757a64cf7e5f0 Mon Sep 17 00:00:00 2001
From: Huang Shijie <b32955@freescale.com>
Date: Fri, 23 May 2014 12:40:40 +0800
Subject: [PATCH] serial: imx: remove the DMA wait queue

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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