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| author | Tung Nguyen <tung.q.nguyen@dektech.com.au> | 2019-02-19 11:20:48 +0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-02-21 13:58:05 -0800 |
| commit | 48766a583c7961af080de2df692f476624a9a21a (patch) | |
| tree | 2ebebb66de46f9d47e2a65ce00b93da76c7a69d9 /net | |
| parent | 223b7329ec6a0dae1b7f7db7b770e93f4a069ef9 (diff) | |
| download | linux-48766a583c7961af080de2df692f476624a9a21a.tar.gz linux-48766a583c7961af080de2df692f476624a9a21a.tar.bz2 linux-48766a583c7961af080de2df692f476624a9a21a.zip | |
tipc: improve function tipc_wait_for_rcvmsg()
This commit replaces schedule_timeout() with wait_woken()
in function tipc_wait_for_rcvmsg(). wait_woken() uses
memory barriers in its implementation to avoid potential
race condition when putting a process into sleeping state
and then waking it up.
Acked-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Tung Nguyen <tung.q.nguyen@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/tipc/socket.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 81b87916a0eb..684f2125fc6b 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1677,7 +1677,7 @@ static void tipc_sk_send_ack(struct tipc_sock *tsk) static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) { struct sock *sk = sock->sk; - DEFINE_WAIT(wait); + DEFINE_WAIT_FUNC(wait, woken_wake_function); long timeo = *timeop; int err = sock_error(sk); @@ -1685,15 +1685,17 @@ static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) return err; for (;;) { - prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { if (sk->sk_shutdown & RCV_SHUTDOWN) { err = -ENOTCONN; break; } + add_wait_queue(sk_sleep(sk), &wait); release_sock(sk); - timeo = schedule_timeout(timeo); + timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo); + sched_annotate_sleep(); lock_sock(sk); + remove_wait_queue(sk_sleep(sk), &wait); } err = 0; if (!skb_queue_empty(&sk->sk_receive_queue)) @@ -1709,7 +1711,6 @@ static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) if (err) break; } - finish_wait(sk_sleep(sk), &wait); *timeop = timeo; return err; } |