From: Kuniyuki Iwashima <kuniyu@amazon.com>
Date: Mon, 10 Jul 2023 21:35:11 +0000 (-0700)
Subject: ipv6: rpl: Remove redundant skb_dst_drop().
X-Git-Tag: v6.6.7~2079^2~408
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c5ec13e38af5527f69f647c46ce15ebaa6b35e6c;p=platform%2Fkernel%2Flinux-starfive.git

ipv6: rpl: Remove redundant skb_dst_drop().

RPL code has a pattern where skb_dst_drop() is called before
ip6_route_input().

However, ip6_route_input() calls skb_dst_drop() internally,
so we need not call skb_dst_drop() before ip6_route_input().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20230710213511.5364-1-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 202fc3a..f4bfcca 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -612,8 +612,6 @@ looped_back:
 
 	kfree(buf);
 
-	skb_dst_drop(skb);
-
 	ip6_route_input(skb);
 
 	if (skb_dst(skb)->error) {
diff --git a/net/ipv6/rpl_iptunnel.c b/net/ipv6/rpl_iptunnel.c
index b1c028d..a013b92 100644
--- a/net/ipv6/rpl_iptunnel.c
+++ b/net/ipv6/rpl_iptunnel.c
@@ -272,8 +272,6 @@ static int rpl_input(struct sk_buff *skb)
 	dst = dst_cache_get(&rlwt->cache);
 	preempt_enable();
 
-	skb_dst_drop(skb);
-
 	if (!dst) {
 		ip6_route_input(skb);
 		dst = skb_dst(skb);
@@ -284,6 +282,7 @@ static int rpl_input(struct sk_buff *skb)
 			preempt_enable();
 		}
 	} else {
+		skb_dst_drop(skb);
 		skb_dst_set(skb, dst);
 	}