linux-kernel - Re: [PATCH v4 3/4] Crypto: rockchip/crypto

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Message-ID: <20151123125142.GA7709@gondor.apana.org.au>
Date:	Mon, 23 Nov 2015 20:51:42 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Zain Wang <zain.wang@...k-chips.com>
Cc:	zhengsq@...k-chips.com, hl@...k-chips.com, davem@...emloft.net,
	mturquette@...libre.com, heiko@...ech.de, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, robh+dt@...nel.org,
	galak@...eaurora.org, linux@....linux.org.uk, mark.rutland@....com,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
	eddie.cai@...k-chips.com
Subject: Re: [PATCH v4 3/4] Crypto: rockchip/crypto - add crypto driver for
 rk3288

On Tue, Nov 17, 2015 at 12:00:46PM +0800, Zain Wang wrote:
>
> +static void rk_ablk_hw_init(struct rk_crypto_info *dev)
> +{
> +	struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(dev->ablk_req);
> +	struct rk_cipher_ctx *ctx = crypto_ablkcipher_ctx(tfm);
> +	u32 conf_reg = 0;
> +
> +	if (dev->mode & TDES) {
> +		dev->mode &= ~TDES;
> +		dev->mode |= RK_CRYPTO_TDES_FIFO_MODE |
> +			     RK_CRYPTO_TDES_BYTESWAP_KEY |
> +			     RK_CRYPTO_TDES_BYTESWAP_IV;
> +		CRYPTO_WRITE(dev, RK_CRYPTO_TDES_CTRL, dev->mode);
> +
> +		memcpy(dev->reg + RK_CRYPTO_TDES_IV_0, dev->ablk_req->info, 8);

Please ensure that the IV is copied back after the operation.
I know that many existing drivers are buggy in this regard but
they will be fixed soon and we will start enforcing this rule
so I don't want to add any new drivers that break this rule.

Thanks,
-- 
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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