linux-kernel - Re: [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA

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Date:	Wed, 4 Mar 2015 12:36:23 -0600
From:	Kim Phillips <kim.phillips@...escale.com>
To:	yjin <yanjiang.jin@...driver.com>
CC:	<horia.geanta@...escale.com>, <herbert@...dor.apana.org.au>,
	<davem@...emloft.net>, <ruchika.gupta@...escale.com>,
	<cristian.stoica@...escale.com>, <NiteshNarayanLal@...escale.com>,
	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<jinyanjiang@...il.com>
Subject: Re: [PATCH 2/3] crypto: caam_rng: fix rng_unmap_ctx's DMA_UNMAP
 size problem

On Wed, 4 Mar 2015 13:33:22 +0800
yjin <yanjiang.jin@...driver.com> wrote:

> On 2015年03月04日 03:31, Kim Phillips wrote:
> > On Tue, 3 Mar 2015 14:50:52 +0800
> > <yanjiang.jin@...driver.com> wrote:
> >
> >> -		dma_unmap_single(jrdev, ctx->sh_desc_dma, DESC_RNG_LEN,
> >> -				 DMA_TO_DEVICE);
> >> +		dma_unmap_single(jrdev, ctx->sh_desc_dma,
> >> +				desc_bytes(ctx->sh_desc), DMA_TO_DEVICE);
> > alignment: the 'd' in desc_bytes should fall directly under the 'j'
> > in jrdev.
> >
> > Also, DESC_RNG_LEN should be corrected to (4 * CAAM_CMD_SZ).
> 
> Hi Kim,
> 
> I can't find the obvious limitation for the RNG descriptor length in 
> Freescale documents, could you point out it?

?  rng_create_sh_desc() creates a fixed descriptor of exactly 4
command-lengths.

Kim
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