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

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Date:	Tue, 7 Feb 2012 06:19:04 -0800
From:	"Bounine, Alexandre" <Alexandre.Bounine@....com>
To:	Vinod Koul <vinod.koul@...el.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, Feb 07, 2012 9:14 AM, Vinod Koul wrote:
> 
> 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 :)

Better, but it can get away without it ;))

Alex.