Re: [PATCH 2/2] Add device_prep_dma_interrupt support to fsldma.c

[Dan Williams]

On Tue, Mar 11, 2008 at 7:28 PM, Zhang Wei <Wei.Zhang@xxxxxxxxxxxxx> 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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