From: Boris Brezillon Subject: Re: [PATCH v7 05/14] crypto: marvell/CESA: add TDMA support Date: Wed, 17 Jun 2015 17:34:02 +0200 Message-ID: <20150617173402.7946bbb0@bbrezillon> References: <20150617122533.GA13185@gondor.apana.org.au> <1434547922-10363-1-git-send-email-boris.brezillon@free-electrons.com> <20150617150808.GA14915@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: "David S. Miller" , linux-crypto-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Arnaud Ebalard , Tawfik Bayouk , Lior Amsalem , Nadav Haklai , Eran Ben-Avi , Thomas Petazzoni , Gregory CLEMENT , Jason Cooper , Sebastian Hesselbarth , Andrew Lunn , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jason Gunthorpe , Imre Kaloz To: Herbert Xu Return-path: In-Reply-To: <20150617150808.GA14915-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-crypto.vger.kernel.org On Wed, 17 Jun 2015 23:08:08 +0800 Herbert Xu wrote: > On Wed, Jun 17, 2015 at 03:32:02PM +0200, Boris Brezillon wrote: > > > > Hi Herbert, > > > > I send you this patch alone so that you can verify I'm now properly > > manipulating the SG list. Once I have your confirmation I'll send > > the whole series again and annoy all the people in Cc one more time > > ;-). > > Thanks. The only problem that I can see is the fact you're not > checking for req->src == req->dst. If they're equal then you must > not map it twice. Instead it should be mapped as DMA_BIDIRECTIONAL. I can check for that too, but note that it doesn't prevent one from providing different scatterlist structures pointing to the same memory region. This being said, checking for req->src == req->dst should fix the case where dst and src are pointing to the same scatterlist, which is a good start. Thanks, Boris -- Boris Brezillon, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html