netdev - [PATCH net-next 43/43] netfilter: Skip unnecessary calls to synchronize

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Message-Id: <1434554932-4552-43-git-send-email-ebiederm@xmission.com>
Date:	Wed, 17 Jun 2015 10:28:52 -0500
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	David Miller <davem@...emloft.net>
Cc:	<netdev@...r.kernel.org>, netfilter-devel@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	Juanjo Ciarlante <jjciarla@...z.uncu.edu.ar>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>,
	Julian Anastasov <ja@....bg>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH net-next 43/43] netfilter: Skip unnecessary calls to synchronize_net

From: Eric W Biederman <ebiederm@...ssion.com>

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 net/netfilter/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 95456c09cf69..1b4eadc9c030 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -134,7 +134,9 @@ void nf_unregister_hook(struct net *net, const struct nf_hook_ops *reg)
 #ifdef HAVE_JUMP_LABEL
 	static_key_slow_dec(&nf_hooks_needed[reg->pf][reg->hooknum]);
 #endif
-	synchronize_net();
+	/* Don't wait if there are no packets in flight */
+	if (net->loopback_dev)
+		synchronize_net();
 	kfree(elem);
 }
 EXPORT_SYMBOL(nf_unregister_hook);
-- 
2.2.1

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