[PATCH net-next 2/4] ocfs2/cluster: block BH in TCP callbacks
From: Eric Dumazet <edumazet@google.com>
Date: 2016-05-18 00:44:22
Subsystem:
filesystems (vfs and infrastructure), oracle cluster filesystem 2 (ocfs2), the rest · Maintainers:
Alexander Viro, Christian Brauner, Mark Fasheh, Joel Becker, Joseph Qi, Linus Torvalds
TCP stack can now run from process context.
Use read_lock_bh() 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@google.com>
---
fs/ocfs2/cluster/tcp.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index 2d0acd6678fe..4238eb28889f 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c@@ -600,10 +600,11 @@ static void o2net_set_nn_state(struct o2net_node *nn, static void o2net_data_ready(struct sock *sk) { void (*ready)(struct sock *sk); + struct o2net_sock_container *sc; - read_lock(&sk->sk_callback_lock); - if (sk->sk_user_data) { - struct o2net_sock_container *sc = sk->sk_user_data; + read_lock_bh(&sk->sk_callback_lock); + sc = sk->sk_user_data; + if (sc) { sclog(sc, "data_ready hit\n"); o2net_set_data_ready_time(sc); o2net_sc_queue_work(sc, &sc->sc_rx_work);
@@ -611,7 +612,7 @@ static void o2net_data_ready(struct sock *sk) } else { ready = sk->sk_data_ready; } - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); ready(sk); }
@@ -622,7 +623,7 @@ static void o2net_state_change(struct sock *sk) void (*state_change)(struct sock *sk); struct o2net_sock_container *sc; - read_lock(&sk->sk_callback_lock); + read_lock_bh(&sk->sk_callback_lock); sc = sk->sk_user_data; if (sc == NULL) { state_change = sk->sk_state_change;
@@ -649,7 +650,7 @@ static void o2net_state_change(struct sock *sk) break; } out: - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); state_change(sk); }
@@ -2012,7 +2013,7 @@ static void o2net_listen_data_ready(struct sock *sk) { void (*ready)(struct sock *sk); - read_lock(&sk->sk_callback_lock); + read_lock_bh(&sk->sk_callback_lock); ready = sk->sk_user_data; if (ready == NULL) { /* check for teardown race */ ready = sk->sk_data_ready;
@@ -2039,7 +2040,7 @@ static void o2net_listen_data_ready(struct sock *sk) } out: - read_unlock(&sk->sk_callback_lock); + read_unlock_bh(&sk->sk_callback_lock); if (ready != NULL) ready(sk); }
--
2.8.0.rc3.226.g39d4020