netdev - [PATCH 08/16] net: Convert tcpv6_net

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Message-ID: <151903018050.32574.12595692788084976790.stgit@localhost.localdomain>
Date:   Mon, 19 Feb 2018 11:49:40 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     davem@...emloft.net, avagin@...tuozzo.com, pablo@...filter.org,
        kadlec@...ckhole.kfki.hu, fw@...len.de, yoshfuji@...ux-ipv6.org,
        afaerber@...e.de, steffen.klassert@...unet.com,
        herbert@...dor.apana.org.au, johannes@...solutions.net,
        netdev@...r.kernel.org, ktkhai@...tuozzo.com
Subject: [PATCH 08/16] net: Convert tcpv6_net_ops

These pernet_operations create and destroy net::ipv6.tcp_sk
socket, which is used in tcp_v6_send_response() only. It looks
like foreign pernet_operations don't want to set ipv6 connection
inside destroyed net, so this socket may be created in destroyed
in parallel with anything else. inet_twsk_purge() is also safe
for that, as described in patch for tcp_sk_ops. So, it's possible
to mark them as async.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 net/ipv6/tcp_ipv6.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 883df0ad5bfe..5425d7b100ee 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -2007,6 +2007,7 @@ static struct pernet_operations tcpv6_net_ops = {
 	.init	    = tcpv6_net_init,
 	.exit	    = tcpv6_net_exit,
 	.exit_batch = tcpv6_net_exit_batch,
+	.async	    = true,
 };
 
 int __init tcpv6_init(void)