diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-12-19 18:00:17 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2024-01-04 11:29:18 +0100 |
| commit | a562c0a2d651e040681b0bfce9b4d229ac3b0b8c (patch) | |
| tree | dff122f7939f384e5f208f324c055c566a951321 | |
| parent | net: kcm: fix direct access to bv_len (diff) | |
| download | linux-a562c0a2d651e040681b0bfce9b4d229ac3b0b8c.tar.xz linux-a562c0a2d651e040681b0bfce9b4d229ac3b0b8c.zip | |
sctp: fix busy polling
Busy polling while holding the socket lock makes litle sense,
because incoming packets wont reach our receive queue.
Fixes: 8465a5fcd1ce ("sctp: add support for busy polling to sctp protocol")
Reported-by: Jacob Moroni <jmoroni@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Cc: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/sctp/socket.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 5fb02bbb4b34..6b9fcdb0952a 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -2102,6 +2102,10 @@ static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, if (unlikely(flags & MSG_ERRQUEUE)) return inet_recv_error(sk, msg, len, addr_len); + if (sk_can_busy_loop(sk) && + skb_queue_empty_lockless(&sk->sk_receive_queue)) + sk_busy_loop(sk, flags & MSG_DONTWAIT); + lock_sock(sk); if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) && @@ -9046,12 +9050,6 @@ struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, int *err) if (sk->sk_shutdown & RCV_SHUTDOWN) break; - if (sk_can_busy_loop(sk)) { - sk_busy_loop(sk, flags & MSG_DONTWAIT); - - if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) - continue; - } /* User doesn't want to wait. */ error = -EAGAIN; |