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rds: tcp: block BH in TCP callbacks

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TCP stack can now run from process context.

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

Fixes: 5413d1babe ("net: do not block BH while processing socket backlog")
Fixes: d41a69f1d3 ("tcp: make tcp_sendmsg() aware of socket backlog")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-05-17 17:44:08 -07:00 committed by David S. Miller
parent e1daca289a
commit 38036629cd
4 changed files with 8 additions and 8 deletions
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4
net/rds/tcp_connect.c
View File

@ -43,7 +43,7 @@ void rds_tcp_state_change(struct sock *sk)
struct rds_connection *conn;
struct rds_tcp_connection *tc;
read_lock(&sk->sk_callback_lock);
read_lock_bh(&sk->sk_callback_lock);
conn = sk->sk_user_data;
if (!conn) {
state_change = sk->sk_state_change;
@ -69,7 +69,7 @@ void rds_tcp_state_change(struct sock *sk)
break;
}
out:
read_unlock(&sk->sk_callback_lock);
read_unlock_bh(&sk->sk_callback_lock);
state_change(sk);
}

4
net/rds/tcp_listen.c
View File

@ -166,7 +166,7 @@ void rds_tcp_listen_data_ready(struct sock *sk)
rdsdebug("listen data ready sk %p\n", sk);
read_lock(&sk->sk_callback_lock);
read_lock_bh(&sk->sk_callback_lock);
ready = sk->sk_user_data;
if (!ready) { /* check for teardown race */
ready = sk->sk_data_ready;
@ -183,7 +183,7 @@ void rds_tcp_listen_data_ready(struct sock *sk)
rds_tcp_accept_work(sk);
out:
read_unlock(&sk->sk_callback_lock);
read_unlock_bh(&sk->sk_callback_lock);
ready(sk);
}

4
net/rds/tcp_recv.c
View File

@ -301,7 +301,7 @@ void rds_tcp_data_ready(struct sock *sk)
rdsdebug("data ready sk %p\n", sk);
read_lock(&sk->sk_callback_lock);
read_lock_bh(&sk->sk_callback_lock);
conn = sk->sk_user_data;
if (!conn) { /* check for teardown race */
ready = sk->sk_data_ready;
@ -315,7 +315,7 @@ void rds_tcp_data_ready(struct sock *sk)
if (rds_tcp_read_sock(conn, GFP_ATOMIC) == -ENOMEM)
queue_delayed_work(rds_wq, &conn->c_recv_w, 0);
out:
read_unlock(&sk->sk_callback_lock);
read_unlock_bh(&sk->sk_callback_lock);
ready(sk);
}

4
net/rds/tcp_send.c
View File

@ -180,7 +180,7 @@ void rds_tcp_write_space(struct sock *sk)
struct rds_connection *conn;
struct rds_tcp_connection *tc;
read_lock(&sk->sk_callback_lock);
read_lock_bh(&sk->sk_callback_lock);
conn = sk->sk_user_data;
if (!conn) {
write_space = sk->sk_write_space;
@ -200,7 +200,7 @@ void rds_tcp_write_space(struct sock *sk)
queue_delayed_work(rds_wq, &conn->c_send_w, 0);
out:
read_unlock(&sk->sk_callback_lock);
read_unlock_bh(&sk->sk_callback_lock);
/*
* write_space is only called when data leaves tcp's send queue if