linux-kernel - [PATCH] ipv6: delete useless dst check in ip6_dst_lookup

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Message-Id: <20210624030914.15808-1-zhangkaiheb@126.com>
Date:   Thu, 24 Jun 2021 11:09:14 +0800
From:   zhang kai <zhangkaiheb@....com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        zhang kai <zhangkaiheb@....com>
Subject: [PATCH] ipv6: delete useless dst check in ip6_dst_lookup_tail

parameter dst always points to null.

Signed-off-by: zhang kai <zhangkaiheb@....com>
---
 net/ipv6/ip6_output.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index ff4f9ebcf..3b632e469 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1055,13 +1055,11 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
 	 * ip6_route_output will fail given src=any saddr, though, so
 	 * that's why we try it again later.
 	 */
-	if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) {
+	if (ipv6_addr_any(&fl6->saddr)) {
 		struct fib6_info *from;
 		struct rt6_info *rt;
-		bool had_dst = *dst != NULL;
 
-		if (!had_dst)
-			*dst = ip6_route_output(net, sk, fl6);
+		*dst = ip6_route_output(net, sk, fl6);
 		rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
 
 		rcu_read_lock();
@@ -1078,7 +1076,7 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
 		 * never existed and let the SA-enabled version take
 		 * over.
 		 */
-		if (!had_dst && (*dst)->error) {
+		if ((*dst)->error) {
 			dst_release(*dst);
 			*dst = NULL;
 		}
-- 
2.17.1