RE: [PATCH 01/11] dmaengine: add context parametertoprep_slave_sgand prep_dma_cyclic

[Vinod Koul]

On Tue, 2012-02-07 at 06:01 -0800, Bounine, Alexandre wrote:
> Currently function private_candidate() allows filtering function
> not to be specified and therefore skip the filter check.
> It may be a good safety measure to ensure that channels specified
> as DMA_SLAVE_EXT provide a corresponding filter routine so they
> positively identify dma channel that will accept intended extra
> parameter.
> I assume that a system may have more than one dmac registered as
> DMA_SLAVE_EXT. 
> 
> This is what I have for RapidIO - the filter call ensures that DMA
> channel is associated with a RapidIO controller that provides access
> to the specified SRIO device. 
For slave-dma it's better to have a filter :)
-- 
~Vinod

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