linux-kernel - RE: [PATCH 01/11] dmaengine: add context parameter toprep_slave_sgand prep_dma

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Date:	Tue, 07 Feb 2012 19:44:17 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	"Bounine, Alexandre" <Alexandre.Bounine@....com>
Cc:	Russell King <rmk@....linux.org.uk>, dan.j.williams@...el.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Jassi Brar <jaswinder.singh@...aro.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Matt Porter <mporter@...nel.crashing.org>,
	Li Yang <leoli@...escale.com>
Subject: RE: [PATCH 01/11] dmaengine: add context parameter
 toprep_slave_sgand prep_dma_cyclic

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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