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Date:	Fri, 4 Jul 2008 16:47:34 +0200
From:	Haavard Skinnemoen <>
To:	Dan Williams <>
Cc:	Pierre Ossman <>,,,,
	"Nelson, Shannon" <>,
	David Brownell <>
Subject: Re: dmaengine skip unmap (was: Re: [PATCH v4 5/6] dmaengine: Driver
 for the Synopsys DesignWare DMA controller)

Dan Williams <> wrote:
> The one thing that stands out is that this driver does not unmap the
> source or destination buffers (and I now notice that fsldma is not doing
> this either, hmm...).  Yes, it is a no-op on avr32, for now, but the
> dma-mapping-api assumes that dma_map is always paired with dma_unmap.  I
> remember we discussed this earlier and that discussion inspired the
> patch below.  The end result is that dw_dmac can try to automatically
> dma_unmap the buffers unless an intelligent client, like the mmc driver,
> has disabled unmap.
> Thoughts?

Looks reasonable. I'll update the dw_dmac driver and post a new version
in a few moments.

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