netdev - RE: [RFC v2] networking: convert many more places to skb_put

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Date:   Thu, 15 Jun 2017 09:54:33 +0000
From:   YUAN Linyu <Linyu.Yuan@...atel-sbell.com.cn>
To:     Johannes Berg <johannes@...solutions.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Johannes Berg <johannes.berg@...el.com>
Subject: RE: [RFC v2] networking: convert many more places to skb_put_zero()



> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of Johannes Berg
> Sent: Thursday, June 15, 2017 5:28 PM
> To: netdev@...r.kernel.org
> Cc: Johannes Berg
> Subject: [RFC v2] networking: convert many more places to skb_put_zero()
> 
> From: Johannes Berg <johannes.berg@...el.com>
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index ea2601501654..aaac2660aaf7 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -1478,10 +1478,9 @@ void *sctp_addto_chunk(struct sctp_chunk *chunk,
> int len, const void *data)
>  	int chunklen = ntohs(chunk->chunk_hdr->length);
>  	int padlen = SCTP_PAD4(chunklen) - chunklen;
> 
> -	padding = skb_put(chunk->skb, padlen);
> +	padding = skb_put_zero(chunk->skb, padlen);
"padding" will become unused. 
I know this place when I check.
>  	target = skb_put(chunk->skb, len);
> 
> -	memset(padding, 0, padlen);
>  	memcpy(target, data, len);
> 
>  	/* Adjust the chunk length field.  */
> --
> 2.11.0