netdev - [PATCH net-next 4/4] tipc: block BH in TCP callbacks

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Date:	Tue, 17 May 2016 17:44:09 -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>,
	Venkatesh Srinivas <venkateshs@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Jon Maloy <jon.maloy@...csson.com>,
	Ying Xue <ying.xue@...driver.com>
Subject: [PATCH net-next 4/4] tipc: block BH in TCP callbacks

TCP stack can now run from process context.

Use read_lock_bh(&sk->sk_callback_lock) variant to restore previous
assumption.

Fixes: 5413d1babe8f ("net: do not block BH while processing socket backlog")
Fixes: d41a69f1d390 ("tcp: make tcp_sendmsg() aware of socket backlog")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Jon Maloy <jon.maloy@...csson.com>
Cc: Ying Xue <ying.xue@...driver.com>
---
 net/tipc/server.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/tipc/server.c b/net/tipc/server.c
index 7a0af2dc0406..272d20a795d5 100644
--- a/net/tipc/server.c
+++ b/net/tipc/server.c
@@ -138,28 +138,28 @@ static void sock_data_ready(struct sock *sk)
 {
 	struct tipc_conn *con;
 
-	read_lock(&sk->sk_callback_lock);
+	read_lock_bh(&sk->sk_callback_lock);
 	con = sock2con(sk);
 	if (con && test_bit(CF_CONNECTED, &con->flags)) {
 		conn_get(con);
 		if (!queue_work(con->server->rcv_wq, &con->rwork))
 			conn_put(con);
 	}
-	read_unlock(&sk->sk_callback_lock);
+	read_unlock_bh(&sk->sk_callback_lock);
 }
 
 static void sock_write_space(struct sock *sk)
 {
 	struct tipc_conn *con;
 
-	read_lock(&sk->sk_callback_lock);
+	read_lock_bh(&sk->sk_callback_lock);
 	con = sock2con(sk);
 	if (con && test_bit(CF_CONNECTED, &con->flags)) {
 		conn_get(con);
 		if (!queue_work(con->server->send_wq, &con->swork))
 			conn_put(con);
 	}
-	read_unlock(&sk->sk_callback_lock);
+	read_unlock_bh(&sk->sk_callback_lock);
 }
 
 static void tipc_register_callbacks(struct socket *sock, struct tipc_conn *con)
-- 
2.8.0.rc3.226.g39d4020