linux-kernel - Re: [PATCH] ixp4xx_crypto panic with fragmented packets in scatterlist

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Message-ID: <20090227005033.GA20046@gondor.apana.org.au>
Date:	Fri, 27 Feb 2009 08:50:33 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	karl@...amoto.org, chohnstaedt@...ominate.com,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [PATCH] ixp4xx_crypto panic with fragmented packets in
	scatterlist

Russell King - ARM Linux <linux@....linux.org.uk> wrote:
>
> I don't think you can use chained scatterlists unless the architecture
> supports it.  It's not a case that you have to flatten the chaining
> before passing it over to the arch - it seems you're not allowed to
> create a chained scatterlist in the first place:
> 
> static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
>                            struct scatterlist *sgl)
> {
> #ifndef ARCH_HAS_SG_CHAIN
>        BUG();
> #endif

The crypto layer does its own chaining.  However, this chaining
is not meant to be exposed to any external entities until generic
chaining has been ported everywhere.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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