From 6b3141962dc82cfe1c30afdf91d564b309859cbe Mon Sep 17 00:00:00 2001
From: Timur Tabi <timur@freescale.com>
Date: Fri, 19 Sep 2008 04:16:19 -0700
Subject: [PATCH] dmatest: properly handle duplicate DMA channels

Update the the dmatest driver so that it handles duplicate DMA channels
properly.

When a DMA client is notified of an available DMA channel, it must check if it
has already allocated resources for that channel.  If so, it should return
DMA_DUP.  This can happen, for example, if a DMA driver calls
dma_async_device_register() more than once.

Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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