netdev - [PATCH net-next 3/4] net/smc: use rcu

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Date:   Sat, 16 Nov 2019 17:47:31 +0100
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        heiko.carstens@...ibm.com, raspl@...ux.ibm.com,
        ubraun@...ux.ibm.com
Subject: [PATCH net-next 3/4] net/smc: use rcu_barrier() on module unload

From: Ursula Braun <ubraun@...ux.ibm.com>

Add rcu_barrier() to make sure no RCU readers or callbacks are
pending when the module is unloaded.

Signed-off-by: Ursula Braun <ubraun@...ux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
---
 net/smc/af_smc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 42b7fb8ab22b..cde4dc0ed173 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -25,6 +25,7 @@
 #include <linux/in.h>
 #include <linux/sched/signal.h>
 #include <linux/if_vlan.h>
+#include <linux/rcupdate_wait.h>
 
 #include <net/sock.h>
 #include <net/tcp.h>
@@ -2111,6 +2112,7 @@ static void __exit smc_exit(void)
 	proto_unregister(&smc_proto);
 	smc_pnet_exit();
 	unregister_pernet_subsys(&smc_net_ops);
+	rcu_barrier();
 }
 
 module_init(smc_init);
-- 
2.17.1