linux-kernel - Re: [PATCH] crypto: chtls - use 'skb_put_zero()' instead of re-implementing it

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Date:   Thu, 15 Aug 2019 15:00:50 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     atul.gupta@...lsio.com, zhongjiang@...wei.com,
        ganeshgr@...lsio.com, davem@...emloft.net, tglx@...utronix.de,
        bigeasy@...utronix.de, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] crypto: chtls - use 'skb_put_zero()' instead of
 re-implementing it

On Wed, Aug 07, 2019 at 05:40:14PM +0200, Christophe JAILLET wrote:
> 'skb_put()+memset()' is equivalent to 'skb_put_zero()'
> Use the latter because it is less verbose and it hides the internals of the
> sk_buff structure.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/crypto/chelsio/chtls/chtls_main.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/crypto/chelsio/chtls/chtls_main.c b/drivers/crypto/chelsio/chtls/chtls_main.c
> index 635bb4b447fb..830b238da77e 100644
> --- a/drivers/crypto/chelsio/chtls/chtls_main.c
> +++ b/drivers/crypto/chelsio/chtls/chtls_main.c
> @@ -218,9 +218,8 @@ static int chtls_get_skb(struct chtls_dev *cdev)
>  	if (!cdev->askb)
>  		return -ENOMEM;
>  
> -	skb_put(cdev->askb, sizeof(struct tcphdr));
> +	skb_put_zero(cdev->askb, sizeof(struct tcphdr));
>  	skb_reset_transport_header(cdev->askb);
> -	memset(cdev->askb->data, 0, cdev->askb->len);

These two are NOT equivalent.
-- 
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