diff options
| author | Eric Dumazet <edumazet@google.com> | 2019-10-23 22:44:51 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-10 11:34:45 +0100 |
| commit | ddd19f01faaa00776f9ce7fd9ffc6dfae5db7442 (patch) | |
| tree | 7b1a192af2b6e98c0059ac92cf4174ee4e3e1c76 | |
| parent | 9fcb07822f7df2d9dd0d461d1ddd571ce3119959 (diff) | |
net: use skb_queue_empty_lockless() in busy poll contexts
[ Upstream commit 3f926af3f4d688e2e11e7f8ed04e277a14d4d4a4 ]
Busy polling usually runs without locks.
Let's use skb_queue_empty_lockless() instead of skb_queue_empty()
Also uses READ_ONCE() in __skb_try_recv_datagram() to address
a similar potential problem.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/crypto/chelsio/chtls/chtls_io.c | 2 | ||||
| -rw-r--r-- | net/core/datagram.c | 2 | ||||
| -rw-r--r-- | net/core/sock.c | 2 | ||||
| -rw-r--r-- | net/ipv4/tcp.c | 2 | ||||
| -rw-r--r-- | net/sctp/socket.c | 2 |
5 files changed, 5 insertions, 5 deletions
diff --git a/drivers/crypto/chelsio/chtls/chtls_io.c b/drivers/crypto/chelsio/chtls/chtls_io.c index 551bca6fef24..f382c2b23d75 100644 --- a/drivers/crypto/chelsio/chtls/chtls_io.c +++ b/drivers/crypto/chelsio/chtls/chtls_io.c @@ -1701,7 +1701,7 @@ int chtls_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, return peekmsg(sk, msg, len, nonblock, flags); if (sk_can_busy_loop(sk) && - skb_queue_empty(&sk->sk_receive_queue) && + skb_queue_empty_lockless(&sk->sk_receive_queue) && sk->sk_state == TCP_ESTABLISHED) sk_busy_loop(sk, nonblock); diff --git a/net/core/datagram.c b/net/core/datagram.c index 7360714c9e69..b824b8117137 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -278,7 +278,7 @@ struct sk_buff *__skb_try_recv_datagram(struct sock *sk, unsigned int flags, break; sk_busy_loop(sk, flags & MSG_DONTWAIT); - } while (sk->sk_receive_queue.prev != *last); + } while (READ_ONCE(sk->sk_receive_queue.prev) != *last); error = -EAGAIN; diff --git a/net/core/sock.c b/net/core/sock.c index 71d047962390..b4247635c4a2 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -3593,7 +3593,7 @@ bool sk_busy_loop_end(void *p, unsigned long start_time) { struct sock *sk = p; - return !skb_queue_empty(&sk->sk_receive_queue) || + return !skb_queue_empty_lockless(&sk->sk_receive_queue) || sk_busy_loop_timeout(sk, start_time); } EXPORT_SYMBOL(sk_busy_loop_end); diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 0ba28b2ea84a..cf79ab96c2df 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1961,7 +1961,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, if (unlikely(flags & MSG_ERRQUEUE)) return inet_recv_error(sk, msg, len, addr_len); - if (sk_can_busy_loop(sk) && skb_queue_empty(&sk->sk_receive_queue) && + if (sk_can_busy_loop(sk) && skb_queue_empty_lockless(&sk->sk_receive_queue) && (sk->sk_state == TCP_ESTABLISHED)) sk_busy_loop(sk, nonblock); diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 1ff3579c6549..b81d7673634c 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -8724,7 +8724,7 @@ struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, if (sk_can_busy_loop(sk)) { sk_busy_loop(sk, noblock); - if (!skb_queue_empty(&sk->sk_receive_queue)) + if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) continue; } |