linux-kernel - Re: [PATCH] crypto: qat - use struct

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Message-ID: <20190613065704.x3wij3dfpcvv54eg@gondor.apana.org.au>
Date:   Thu, 13 Jun 2019 14:57:04 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        "David S. Miller" <davem@...emloft.net>, qat-linux@...el.com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: qat - use struct_size() helper

On Thu, Jun 06, 2019 at 09:57:13AM -0500, Gustavo A. R. Silva wrote:
> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
> 
> struct qat_alg_buf_list {
> 	...
>         struct qat_alg_buf bufers[];
> } __packed __aligned(64);
> 
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes.
> 
> So, replace the following form:
> 
> sizeof(struct qat_alg_buf_list) + ((1 + n) * sizeof(struct qat_alg_buf))
> 
> with:
> 
> struct_size(bufl, bufers, n + 1)
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/crypto/qat/qat_common/qat_algs.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)

Patch applied.  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