linux-kernel - Re: [PATCH v6 05/14] crypto: marvell/CESA: add TDMA support

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Message-ID: <20150618093730.GA29911@gondor.apana.org.au>
Date:	Thu, 18 Jun 2015 17:37:30 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Nadav Haklai <nadavh@...vell.com>,
	Mark Rutland <mark.rutland@....com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	devicetree@...r.kernel.org, Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Arnaud Ebalard <arno@...isbad.org>,
	Rob Herring <robh+dt@...nel.org>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Kumar Gala <galak@...eaurora.org>,
	Imre Kaloz <kaloz@...nwrt.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v6 05/14] crypto: marvell/CESA: add TDMA support

On Thu, Jun 18, 2015 at 10:04:00AM +0100, Russell King - ARM Linux wrote:
>
> If dma_map_sg() coalesces scatterlist entries, then ret will be smaller
> than src_nents, and ret indicates how many scatterlist entries to be
> walked during DMA - you should not use src_nents for that.  I couldn't
> see where the driver used that information.  In fact, the driver seems
> to be capable of walking more than src_nents/ret numbers of scatterlist
> entries: it just keeps going with sg_next() until it hits the end of
> the allocated scatterlist.

I think he should be OK even though he throws away the return value
because he's stopping his walk once the sum of sg_dma_length reaches
his end goal.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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