linux-kernel - Re: [PATCH RFCv1 1/2] dmaengine: add support for scatterlist to scatterlist transfers

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Message-ID: <1285366814.21375.30.camel@dwillia2-linux>
Date:	Fri, 24 Sep 2010 15:20:14 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFCv1 1/2] dmaengine: add support for scatterlist to
 scatterlist transfers

On Fri, 2010-09-24 at 15:04 -0700, Ira W. Snyder wrote:
> On Fri, Sep 24, 2010 at 02:53:14PM -0700, Dan Williams wrote:
> > What about overrun or underrun do we not care if src_total != dst_total?
> > 
> > Otherwise looks ok.
> > 
> 
> I don't know if we should care about that. The algorithm handles that
> case just fine. It copies the maximum amount it can, which is exactly
> min(src_total, dst_total). Whichever scatterlist runs out of entries
> first is the shortest.
> 
> As a real world example, my driver verifies that both scatterlists have
> exactly the right number of bytes available before trying to program the
> hardware.

Ok, just handle the prep failure and I think we are good to go.

--
Dan


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