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

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Message-ID: <1413849173.5407.6.camel@perches.com>
Date:	Mon, 20 Oct 2014 16:52:53 -0700
From:	Joe Perches <joe@...ches.com>
To:	Vladimir Zapolskiy <vz@...ia.com>
Cc:	LABBE Corentin <clabbe.montjoie@...il.com>, 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,
	herbert@...dor.apana.org.au, davem@...emloft.net,
	grant.likely@...aro.org, akpm@...ux-foundation.org,
	gregkh@...uxfoundation.org, mchehab@....samsung.com, crope@....fi,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com, linux-crypto@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 4/4] crypto: Add Allwinner Security System crypto
 accelerator

On Tue, 2014-10-21 at 02:28 +0300, Vladimir Zapolskiy wrote:
> On 19.10.2014 17:16, 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.
[]
> > diff --git a/drivers/crypto/sunxi-ss/sunxi-ss-core.c b/drivers/crypto/sunxi-ss/sunxi-ss-core.c
[]
> > +	cr = clk_get_rate(ss->busclk);
> > +	if (cr >= cr_ahb)
> > +		dev_dbg(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %lu)\n",
> > +				cr, cr / 1000000, cr_ahb);
> > +	else
> > +		dev_warn(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %lu)\n",
> > +				cr, cr / 1000000, cr_ahb);
> 
> See next comment.
> 
> > +	cr = clk_get_rate(ss->ssclk);
> > +	if (cr <= cr_mod)
> > +		if (cr < cr_mod)
> > +			dev_info(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %lu)\n",
> > +					cr, cr / 1000000, cr_mod);
> > +		else
> > +			dev_dbg(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %lu)\n",
> > +					cr, cr / 1000000, cr_mod);
> > +	else
> > +		dev_warn(&pdev->dev, "Clock ss is at %lu (%lu MHz) (must be <= %lu)\n",
> > +				cr, cr / 1000000, cr_mod);
> 
> The management of kernel log levels looks pretty strange. As far as I
> understand there is no error on any clock rate, I'd recommend to keep
> only one information message.

And if not, please add some braces.

> hash_init: initialize request context */
> > +int sunxi_hash_init(struct ahash_request *areq)
> > +{
> > +	const char *hash_type;
> > +	struct sunxi_req_ctx *op = ahash_request_ctx(areq);
> > +
> > +	memset(op, 0, sizeof(struct sunxi_req_ctx));
> > +
> > +	hash_type = crypto_tfm_alg_name(areq->base.tfm);
> > +
> > +	if (strcmp(hash_type, "sha1") == 0)
> > +		op->mode = SS_OP_SHA1;
> > +	if (strcmp(hash_type, "md5") == 0)
> > +		op->mode = SS_OP_MD5;

else if ?

> > +	if (op->mode == 0)
> > +		return -EINVAL;

maybe this?

	if (!strcmp(hash_type, "sha1"))
		op->mode = SS_OP_SHA1;
	else if (!strcmp(hash_type, "md5"))
		op->mode = SH_OP_MD5;
	else
		return -EINVAL;

> > +
> > +	return 0;
> > +}
[]
> > +int sunxi_hash_update(struct ahash_request *areq)
> > +{
[]
> > +	dev_dbg(ss->dev, "%s %s bc=%llu len=%u mode=%x bw=%u ww=%u",
> > +			__func__, crypto_tfm_alg_name(areq->base.tfm),
> > +			op->byte_count, areq->nbytes, op->mode,
> > +			op->nbw, op->nwait);

dev_dbg statements generally don't need __func__ as
dynamic_debug can add it.

If you want to keep it, the most common output form for
__func__ is '"%s: ...", __func__'

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