linux-kernel - Re: [RFC v3 4/7] dmaengine: Add slave DMA interface

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Message-ID: <e9c3a7c20802131107x4c9e6859p3bc6527b19c416cb@mail.gmail.com>
Date:	Wed, 13 Feb 2008 12:07:26 -0700
From:	"Dan Williams" <dan.j.williams@...el.com>
To:	"Haavard Skinnemoen" <hskinnemoen@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	"Shannon Nelson" <shannon.nelson@...el.com>,
	"David Brownell" <david-b@...bell.net>, kernel@...32linux.org,
	"Francis Moreau" <francis.moro@...il.com>,
	"Paul Mundt" <lethal@...ux-sh.org>,
	"Vladimir A. Barinov" <vbarinov@...mvista.com>,
	"Pierre Ossman" <drzeus-list@...eus.cx>
Subject: Re: [RFC v3 4/7] dmaengine: Add slave DMA interface

On Feb 12, 2008 9:43 AM, Haavard Skinnemoen <hskinnemoen@...el.com> wrote:
[..]
>  /**
> + * struct dma_slave_descriptor - extended DMA descriptor for slave DMA
> + * @async_tx: async transaction descriptor
> + * @client_node: for use by the client, for example when operating on
> + *     scatterlists.
> + */
> +struct dma_slave_descriptor {
> +       struct dma_async_tx_descriptor txd;
> +       struct list_head client_node;
> +};

Can you explain a bit why client_node is needed?  I do not think we
need dma_slave_descriptor if dma_unmap data / control is added to
dma_async_tx_descriptor.  Hmm?
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