From 8e2e27c7444ba7880aa0a4cb07a79de130d0ed93 Mon Sep 17 00:00:00 2001
From: Richard Zhao <richard.zhao@freescale.com>
Date: Mon, 4 Jun 2012 09:17:24 +0800
Subject: [PATCH] dma: imx-sdma: buf_tail should be initialize in prepare
 function

This fix audio underrun issue. When SNDRV_PCM_TRIGGER_STOP
and SNDRV_PCM_TRIGGER_START, it calls prepare again. buf_tail
should be reset to zero.
So move buf_tail initialization into prepare function.

Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
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