netdev - [PATCH net-next] net: ndisc.c: reduce size of __ndisc_fill_addr

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Date:   Sat, 27 May 2017 06:00:52 +0800
From:   yuan linyu <cugyly@....com>
To:     netdev@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Joe Perches <joe@...ches.com>, David Ahern <dsahern@...il.com>,
        yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
Subject: [PATCH net-next] net: ndisc.c: reduce size of __ndisc_fill_addr_option()

From: yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>

Signed-off-by: yuan linyu <Linyu.Yuan@...atel-sbell.com.cn>
---
 net/ipv6/ndisc.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index d310dc4..414e929 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -148,17 +148,18 @@ void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
 
 	opt[0] = type;
 	opt[1] = space>>3;
+	opt   += 2;
+	space -= 2;
 
-	memset(opt + 2, 0, pad);
+	memset(opt, 0, pad);
 	opt   += pad;
 	space -= pad;
 
-	memcpy(opt+2, data, data_len);
-	data_len += 2;
+	memcpy(opt, data, data_len);
 	opt += data_len;
 	space -= data_len;
-	if (space > 0)
-		memset(opt, 0, space);
+
+	memset(opt, 0, space);
 }
 EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option);
 
-- 
2.7.4