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

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Message-ID: <20150617122533.GA13185@gondor.apana.org.au>
Date:	Wed, 17 Jun 2015 20:25:33 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, Arnaud Ebalard <arno@...isbad.org>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Andrew Lunn <andrew@...n.ch>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Imre Kaloz <kaloz@...nwrt.org>
Subject: Re: [PATCH v6 05/14] crypto: marvell/CESA: add TDMA support

On Wed, Jun 17, 2015 at 01:33:24PM +0200, Boris Brezillon wrote:
>
> Actually, I think I don't need to save the dma_map_sg return val, since
> I'm using the sg_next function to iterate over the scatterlist. Am I
> right ?
> IOW, is the ->map_sg() function (in dma_map_ops) supposed to merge the
> contiguous entries and then flag the unused entries with the is_chain
> flag ?

Right.  If you're simply using sg_dma_length in conjunction with
sg_next then you don't need the new length.

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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