linux-kernel - Re: [PATCH RESEND] netfilter: remove unused variable

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Date:	Sat, 4 Jan 2014 00:11:46 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Michal Nazarewicz <mina86@...a86.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] netfilter: remove unused variable

On Wed, Jan 01, 2014 at 06:27:19AM +0100, Michal Nazarewicz wrote:
> The nfmsg variable is not used (except in sizeof operator which does
> not care about its value) between the first and second time it is
> assigned the value.  Furthermore, nlmsg_data has no side effects, so
> the assignment can be safely removed.

Applied with minor glitch, see below.

Thanks.

> Signed-off-by: Michal Nazarewicz <mina86@...a86.com>
> Cc: Patrick McHardy <kaber@...sh.net>
> ---
>  net/netfilter/nf_tables_api.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> index f93b7d0..9c56adc 100644
> --- a/net/netfilter/nf_tables_api.c
> +++ b/net/netfilter/nf_tables_api.c
> @@ -2521,7 +2521,6 @@ static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
>  	u32 portid, seq;
>  	int event, err;
>  
> -	nfmsg = nlmsg_data(cb->nlh);
>  	err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_ELEM_LIST_MAX,

mangled this patch to use sizeof(struct nfgenmsg) instead. That change
is not required from the semantic point of view, of course, but for
readability reasons I think it's better not to refer to a variable
that is not used in that context.

>  			  nft_set_elem_list_policy);
>  	if (err < 0)
> -- 
> 1.8.4
> 
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