linux-kernel - Re: [PATCH 3/8] staging: ccree: simplify AEAD using local var

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Message-ID: <20171107103523.ests5w6m3c7ria73@mwanda>
Date:   Tue, 7 Nov 2017 13:35:23 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        driverdev-devel@...uxdriverproject.org,
        linux-crypto@...r.kernel.org, Ofir Drang <ofir.drang@....com>
Subject: Re: [PATCH 3/8] staging: ccree: simplify AEAD using local var

On Tue, Nov 07, 2017 at 09:39:59AM +0000, Gilad Ben-Yossef wrote:
> Make the code more readable by using a local variable
> for commonly use expression in the AEAD part of the driver.
> 
> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> ---
>  drivers/staging/ccree/ssi_aead.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/ccree/ssi_aead.c b/drivers/staging/ccree/ssi_aead.c
> index 0b5b230..f1a3976 100644
> --- a/drivers/staging/ccree/ssi_aead.c
> +++ b/drivers/staging/ccree/ssi_aead.c
> @@ -251,13 +251,11 @@ static void ssi_aead_complete(struct device *dev, void *ssi_req, void __iomem *c
>  		}
>  	} else { /*ENCRYPT*/
>  		if (unlikely(areq_ctx->is_icv_fragmented)) {
> +			u32 loc = areq->cryptlen + areq_ctx->dst_offset;

"loc" isn't a very canonical name.  At first I thought this was "pos"
or maybe "end" but now I'm thinking this is "skip"?  I don't know what
this variable is.

> +
>  			cc_copy_sg_portion(dev, areq_ctx->mac_buf,
> -					   areq_ctx->dst_sgl,
> -					   (areq->cryptlen +
> -					    areq_ctx->dst_offset),
> -					   (areq->cryptlen +
> -					    areq_ctx->dst_offset +
> -					    ctx->authsize),
> +					   areq_ctx->dst_sgl, loc,
> +					   (loc + ctx->authsize),
>  					   SSI_SG_FROM_BUF);
>  		}

regards,
dan carpenter