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sctp: fix busy polling 

[ Upstream commit a562c0a2d651e040681b0bfce9b4d229ac3b0b8c ]

Busy polling while holding the socket lock makes litle sense,
because incoming packets wont reach our receive queue.

Fixes: 8465a5fcd1 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2023-12-19 17:00:17 +00:00 committed by Greg Kroah-Hartman
parent 9702e7fb63
commit 63c3c44ff4
1 changed files with 4 additions and 6 deletions
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10
net/sctp/socket.c
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@ -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;