netdev - [PATCH net-next 1/3] ipv6: fib6_info_destroy

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Message-Id: <20190423013503.217729-2-edumazet@google.com>
Date:   Mon, 22 Apr 2019 18:35:01 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Wei Wang <weiwan@...gle.com>
Subject: [PATCH net-next 1/3] ipv6: fib6_info_destroy_rcu() cleanup

We do not need to clear f6i->rt6i_exception_bucket right before
freeing f6i.

Note that f6i->rt6i_exception_bucket is properly protected by
f6i->exception_bucket_flushed being set to one in rt6_flush_exceptions()
under the protection of rt6_exception_lock.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Wei Wang <weiwan@...gle.com>
---
 net/ipv6/ip6_fib.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index b47e15df9769ccb2919e6ec0de5edd93f2ae518f..55193859152969794dab3df02637217a7f21016f 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -175,10 +175,7 @@ void fib6_info_destroy_rcu(struct rcu_head *head)
 	WARN_ON(f6i->fib6_node);
 
 	bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1);
-	if (bucket) {
-		f6i->rt6i_exception_bucket = NULL;
-		kfree(bucket);
-	}
+	kfree(bucket);
 
 	if (f6i->rt6i_pcpu) {
 		int cpu;
-- 
2.21.0.593.g511ec345e18-goog