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net: use skb_queue_empty_lockless() in poll() handlers

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[ Upstream commit 3ef7cf57c7 ]

Many poll() handlers are lockless. Using skb_queue_empty_lockless()
instead of skb_queue_empty() is more appropriate.

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>
This commit is contained in:
Eric Dumazet 2019-10-23 22:44:50 -07:00 committed by Greg Kroah-Hartman
parent afa1f5e98c
commit eaf548feaa
14 changed files with 22 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/isdn/capi/capi.c
View File

@ -744,7 +744,7 @@ capi_poll(struct file *file, poll_table *wait)
poll_wait(file, &(cdev->recvwait), wait);
mask = EPOLLOUT | EPOLLWRNORM;
if (!skb_queue_empty(&cdev->recvqueue))
if (!skb_queue_empty_lockless(&cdev->recvqueue))
mask |= EPOLLIN | EPOLLRDNORM;
return mask;
}

2
net/atm/common.c
View File

@ -667,7 +667,7 @@ __poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
mask |= EPOLLHUP;
/* readable? */
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
mask |= EPOLLIN | EPOLLRDNORM;
/* writable? */

4
net/bluetooth/af_bluetooth.c
View File

@ -460,7 +460,7 @@ __poll_t bt_sock_poll(struct file *file, struct socket *sock,
if (sk->sk_state == BT_LISTEN)
return bt_accept_poll(sk);
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
mask |= EPOLLERR |
(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
@ -470,7 +470,7 @@ __poll_t bt_sock_poll(struct file *file, struct socket *sock,
if (sk->sk_shutdown == SHUTDOWN_MASK)
mask |= EPOLLHUP;
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
mask |= EPOLLIN | EPOLLRDNORM;
if (sk->sk_state == BT_CLOSED)

2
net/caif/caif_socket.c
View File

@ -953,7 +953,7 @@ static __poll_t caif_poll(struct file *file,
mask |= EPOLLRDHUP;
/* readable? */
if (!skb_queue_empty(&sk->sk_receive_queue) ||
if (!skb_queue_empty_lockless(&sk->sk_receive_queue) ||
(sk->sk_shutdown & RCV_SHUTDOWN))
mask |= EPOLLIN | EPOLLRDNORM;

4
net/core/datagram.c
View File

@ -842,7 +842,7 @@ __poll_t datagram_poll(struct file *file, struct socket *sock,
mask = 0;
/* exceptional events? */
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
mask |= EPOLLERR |
(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
@ -852,7 +852,7 @@ __poll_t datagram_poll(struct file *file, struct socket *sock,
mask |= EPOLLHUP;
/* readable? */
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
mask |= EPOLLIN | EPOLLRDNORM;
/* Connection-based need to check for termination and startup */

2
net/decnet/af_decnet.c
View File

@ -1213,7 +1213,7 @@ static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table *wai
struct dn_scp *scp = DN_SK(sk);
__poll_t mask = datagram_poll(file, sock, wait);
if (!skb_queue_empty(&scp->other_receive_queue))
if (!skb_queue_empty_lockless(&scp->other_receive_queue))
mask |= EPOLLRDBAND;
return mask;

2
net/ipv4/tcp.c
View File

@ -595,7 +595,7 @@ __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
}
/* This barrier is coupled with smp_wmb() in tcp_reset() */
smp_rmb();
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
mask |= EPOLLERR;
return mask;

2
net/ipv4/udp.c
View File

@ -2651,7 +2651,7 @@ __poll_t udp_poll(struct file *file, struct socket *sock, poll_table *wait)
__poll_t mask = datagram_poll(file, sock, wait);
struct sock *sk = sock->sk;
if (!skb_queue_empty(&udp_sk(sk)->reader_queue))
if (!skb_queue_empty_lockless(&udp_sk(sk)->reader_queue))
mask |= EPOLLIN | EPOLLRDNORM;
/* Check for false positives due to checksum errors */

4
net/nfc/llcp_sock.c
View File

@ -566,11 +566,11 @@ static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
if (sk->sk_state == LLCP_LISTEN)
return llcp_accept_poll(sk);
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
mask |= EPOLLERR |
(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
mask |= EPOLLIN | EPOLLRDNORM;
if (sk->sk_state == LLCP_CLOSED)

4
net/phonet/socket.c
View File

@ -351,9 +351,9 @@ static __poll_t pn_socket_poll(struct file *file, struct socket *sock,
if (sk->sk_state == TCP_CLOSE)
return EPOLLERR;
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
mask |= EPOLLIN | EPOLLRDNORM;
if (!skb_queue_empty(&pn->ctrlreq_queue))
if (!skb_queue_empty_lockless(&pn->ctrlreq_queue))
mask |= EPOLLPRI;
if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
return EPOLLHUP;

4
net/sctp/socket.c
View File

@ -7939,7 +7939,7 @@ __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
mask = 0;
/* Is there any exceptional events? */
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
mask |= EPOLLERR |
(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
if (sk->sk_shutdown & RCV_SHUTDOWN)
@ -7948,7 +7948,7 @@ __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
mask |= EPOLLHUP;
/* Is it readable? Reconsider this code with TCP-style support. */
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
mask |= EPOLLIN | EPOLLRDNORM;
/* The association is either gone or not ready. */

4
net/tipc/socket.c
View File

@ -731,7 +731,7 @@ static __poll_t tipc_poll(struct file *file, struct socket *sock,
/* fall thru' */
case TIPC_LISTEN:
case TIPC_CONNECTING:
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
revents |= EPOLLIN | EPOLLRDNORM;
break;
case TIPC_OPEN:
@ -739,7 +739,7 @@ static __poll_t tipc_poll(struct file *file, struct socket *sock,
revents |= EPOLLOUT;
if (!tipc_sk_type_connectionless(sk))
break;
if (skb_queue_empty(&sk->sk_receive_queue))
if (skb_queue_empty_lockless(&sk->sk_receive_queue))
break;
revents |= EPOLLIN | EPOLLRDNORM;
break;

6
net/unix/af_unix.c
View File

@ -2661,7 +2661,7 @@ static __poll_t unix_poll(struct file *file, struct socket *sock, poll_table *wa
mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
/* readable? */
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
mask |= EPOLLIN | EPOLLRDNORM;
/* Connection-based need to check for termination and startup */
@ -2690,7 +2690,7 @@ static __poll_t unix_dgram_poll(struct file *file, struct socket *sock,
mask = 0;
/* exceptional events? */
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
mask |= EPOLLERR |
(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
@ -2700,7 +2700,7 @@ static __poll_t unix_dgram_poll(struct file *file, struct socket *sock,
mask |= EPOLLHUP;
/* readable? */
if (!skb_queue_empty(&sk->sk_receive_queue))
if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
mask |= EPOLLIN | EPOLLRDNORM;
/* Connection-based need to check for termination and startup */

2
net/vmw_vsock/af_vsock.c
View File

@ -873,7 +873,7 @@ static __poll_t vsock_poll(struct file *file, struct socket *sock,
* the queue and write as long as the socket isn't shutdown for
* sending.
*/
if (!skb_queue_empty(&sk->sk_receive_queue) ||
if (!skb_queue_empty_lockless(&sk->sk_receive_queue) ||
(sk->sk_shutdown & RCV_SHUTDOWN)) {
mask |= EPOLLIN | EPOLLRDNORM;
}