linux-kernel - Re: [PATCH 2/2] Add device_prep_dma

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Message-ID: <e9c3a7c20803120938w1d10da4bk33a0376e90fe9e61@mail.gmail.com>
Date:	Wed, 12 Mar 2008 09:38:45 -0700
From:	"Dan Williams" <dan.j.williams@...el.com>
To:	"Zhang Wei" <Wei.Zhang@...escale.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Add device_prep_dma_interrupt support to fsldma.c

On Tue, Mar 11, 2008 at 7:28 PM, Zhang Wei <Wei.Zhang@...escale.com> wrote:
[..]
>  But I have a question about device_prep_dma_interrupt(), which is no way to assign
>   dest and src address. Is it a null tx action dma_async_tx_descriptor except to trigger
>   an interrupt?
>

Yes, it is for sequences where we are scheduling a chain of operations
of indeterminate length and want a callback after they all complete.
See ops_run_biofill() in drivers/md/raid5.c for an example.

>  Thanks!
>  Wei.

--
Dan
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