From d9dc8b0f8b4ec8cdc48ad5a20a3105387138be82 Mon Sep 17 00:00:00 2001 From: WANG Cong Date: Fri, 11 Nov 2016 10:20:50 -0800 Subject: net: fix sleeping for sk_wait_event() Similar to commit 14135f30e33c ("inet: fix sleeping inside inet_wait_for_connect()"), sk_wait_event() needs to fix too, because release_sock() is blocking, it changes the process state back to running after sleep, which breaks the previous prepare_to_wait(). Switch to the new wait API. Cc: Eric Dumazet Cc: Peter Zijlstra Signed-off-by: Cong Wang Signed-off-by: David S. Miller --- net/core/stream.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) (limited to 'net/core/stream.c') diff --git a/net/core/stream.c b/net/core/stream.c index 1086c8b280a8..f575bcf64af2 100644 --- a/net/core/stream.c +++ b/net/core/stream.c @@ -53,8 +53,8 @@ void sk_stream_write_space(struct sock *sk) */ int sk_stream_wait_connect(struct sock *sk, long *timeo_p) { + DEFINE_WAIT_FUNC(wait, woken_wake_function); struct task_struct *tsk = current; - DEFINE_WAIT(wait); int done; do { @@ -68,13 +68,13 @@ int sk_stream_wait_connect(struct sock *sk, long *timeo_p) if (signal_pending(tsk)) return sock_intr_errno(*timeo_p); - prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); + add_wait_queue(sk_sleep(sk), &wait); sk->sk_write_pending++; done = sk_wait_event(sk, timeo_p, !sk->sk_err && !((1 << sk->sk_state) & - ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))); - finish_wait(sk_sleep(sk), &wait); + ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)), &wait); + remove_wait_queue(sk_sleep(sk), &wait); sk->sk_write_pending--; } while (!done); return 0; @@ -94,16 +94,16 @@ static inline int sk_stream_closing(struct sock *sk) void sk_stream_wait_close(struct sock *sk, long timeout) { if (timeout) { - DEFINE_WAIT(wait); + DEFINE_WAIT_FUNC(wait, woken_wake_function); + + add_wait_queue(sk_sleep(sk), &wait); do { - prepare_to_wait(sk_sleep(sk), &wait, - TASK_INTERRUPTIBLE); - if (sk_wait_event(sk, &timeout, !sk_stream_closing(sk))) + if (sk_wait_event(sk, &timeout, !sk_stream_closing(sk), &wait)) break; } while (!signal_pending(current) && timeout); - finish_wait(sk_sleep(sk), &wait); + remove_wait_queue(sk_sleep(sk), &wait); } } EXPORT_SYMBOL(sk_stream_wait_close); @@ -119,16 +119,16 @@ int sk_stream_wait_memory(struct sock *sk, long *timeo_p) long vm_wait = 0; long current_timeo = *timeo_p; bool noblock = (*timeo_p ? false : true); - DEFINE_WAIT(wait); + DEFINE_WAIT_FUNC(wait, woken_wake_function); if (sk_stream_memory_free(sk)) current_timeo = vm_wait = (prandom_u32() % (HZ / 5)) + 2; + add_wait_queue(sk_sleep(sk), &wait); + while (1) { sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); - prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); - if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) goto do_error; if (!*timeo_p) { @@ -147,7 +147,7 @@ int sk_stream_wait_memory(struct sock *sk, long *timeo_p) sk_wait_event(sk, ¤t_timeo, sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN) || (sk_stream_memory_free(sk) && - !vm_wait)); + !vm_wait), &wait); sk->sk_write_pending--; if (vm_wait) { @@ -161,7 +161,7 @@ int sk_stream_wait_memory(struct sock *sk, long *timeo_p) *timeo_p = current_timeo; } out: - finish_wait(sk_sleep(sk), &wait); + remove_wait_queue(sk_sleep(sk), &wait); return err; do_error: -- cgit