linux-kernel - Re: [PATCH v5 4/4] crypto: Add Allwinner Security System crypto accelerator

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Message-ID: <20141106141358.GA3300@gondor.apana.org.au>
Date:	Thu, 6 Nov 2014 22:13:58 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	LABBE Corentin <clabbe.montjoie@...il.com>
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	maxime.ripard@...e-electrons.com, linux@....linux.org.uk,
	davem@...emloft.net, grant.likely@...aro.org,
	akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
	joe@...ches.com, mchehab@....samsung.com, crope@....fi,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	linux-sunxi@...glegroups.com
Subject: Re: [PATCH v5 4/4] crypto: Add Allwinner Security System crypto
 accelerator

On Sun, Oct 19, 2014 at 04:16:22PM +0200, LABBE Corentin wrote:
> Add support for the Security System included in Allwinner SoC A20.
> The Security System is a hardware cryptographic accelerator that support AES/MD5/SHA1/DES/3DES/PRNG algorithms.
> 
> Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>

OK this is much better.  However it seems that export/import
is still missing?

> +	src_addr = kmap_atomic(sg_page(in_sg)) + in_sg->offset;
> +	if (src_addr == NULL) {
> +		dev_err(ss->dev, "kmap_atomic error for src SG\n");
> +		writel(0, ss->base + SS_CTL);
> +		mutex_unlock(&ss->lock);

I overlooked this the last time around.  You cannot use mutexes
here as you can be called from softirq context so you need spin
locks.

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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