summaryrefslogtreecommitdiff
path: root/net/tipc
diff options
context:
space:
mode:
authorYing Xue <ying.xue@windriver.com>2014-01-17 09:50:07 +0800
committerDavid S. Miller <davem@davemloft.net>2014-01-16 19:10:34 -0800
commit9bbb4ecc681968b7cf781e08e3918604c3b699d3 (patch)
tree7c0c3aa49a645be67a43bdec3b3e354714dc1f61 /net/tipc
parent391a6dd1da3979be7b6fc0d9ded1b0b906bd068f (diff)
tipc: standardize recvmsg routine
Standardize the behaviour of waiting for events in TIPC recvmsg() so that all variables of socket or port structures are protected within socket lock, allowing the process of calling recvmsg() to be woken up at appropriate time. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/socket.c80
1 files changed, 42 insertions, 38 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index c4803101fbdf..eab17eb9ca1d 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -55,9 +55,6 @@ struct tipc_sock {
#define tipc_sk(sk) ((struct tipc_sock *)(sk))
#define tipc_sk_port(sk) (tipc_sk(sk)->p)
-#define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
- (sock->state == SS_DISCONNECTING))
-
static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
static void wakeupdispatch(struct tipc_port *tport);
@@ -994,6 +991,37 @@ static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
return 0;
}
+static int tipc_wait_for_rcvmsg(struct socket *sock, long timeo)
+{
+ struct sock *sk = sock->sk;
+ DEFINE_WAIT(wait);
+ int err;
+
+ for (;;) {
+ prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+ if (skb_queue_empty(&sk->sk_receive_queue)) {
+ if (sock->state == SS_DISCONNECTING) {
+ err = -ENOTCONN;
+ break;
+ }
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock(sk);
+ }
+ err = 0;
+ if (!skb_queue_empty(&sk->sk_receive_queue))
+ break;
+ err = sock_intr_errno(timeo);
+ if (signal_pending(current))
+ break;
+ err = -EAGAIN;
+ if (!timeo)
+ break;
+ }
+ finish_wait(sk_sleep(sk), &wait);
+ return err;
+}
+
/**
* recv_msg - receive packet-oriented message
* @iocb: (unused)
@@ -1013,7 +1041,7 @@ static int recv_msg(struct kiocb *iocb, struct socket *sock,
struct tipc_port *tport = tipc_sk_port(sk);
struct sk_buff *buf;
struct tipc_msg *msg;
- long timeout;
+ long timeo;
unsigned int sz;
u32 err;
int res;
@@ -1029,25 +1057,13 @@ static int recv_msg(struct kiocb *iocb, struct socket *sock,
goto exit;
}
- timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+ timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
restart:
/* Look for a message in receive queue; wait if necessary */
- while (skb_queue_empty(&sk->sk_receive_queue)) {
- if (sock->state == SS_DISCONNECTING) {
- res = -ENOTCONN;
- goto exit;
- }
- if (timeout <= 0L) {
- res = timeout ? timeout : -EWOULDBLOCK;
- goto exit;
- }
- release_sock(sk);
- timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
- tipc_rx_ready(sock),
- timeout);
- lock_sock(sk);
- }
+ res = tipc_wait_for_rcvmsg(sock, timeo);
+ if (res)
+ goto exit;
/* Look at first message in receive queue */
buf = skb_peek(&sk->sk_receive_queue);
@@ -1119,7 +1135,7 @@ static int recv_stream(struct kiocb *iocb, struct socket *sock,
struct tipc_port *tport = tipc_sk_port(sk);
struct sk_buff *buf;
struct tipc_msg *msg;
- long timeout;
+ long timeo;
unsigned int sz;
int sz_to_copy, target, needed;
int sz_copied = 0;
@@ -1132,31 +1148,19 @@ static int recv_stream(struct kiocb *iocb, struct socket *sock,
lock_sock(sk);
- if (unlikely((sock->state == SS_UNCONNECTED))) {
+ if (unlikely(sock->state == SS_UNCONNECTED)) {
res = -ENOTCONN;
goto exit;
}
target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
- timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+ timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
restart:
/* Look for a message in receive queue; wait if necessary */
- while (skb_queue_empty(&sk->sk_receive_queue)) {
- if (sock->state == SS_DISCONNECTING) {
- res = -ENOTCONN;
- goto exit;
- }
- if (timeout <= 0L) {
- res = timeout ? timeout : -EWOULDBLOCK;
- goto exit;
- }
- release_sock(sk);
- timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
- tipc_rx_ready(sock),
- timeout);
- lock_sock(sk);
- }
+ res = tipc_wait_for_rcvmsg(sock, timeo);
+ if (res)
+ goto exit;
/* Look at first message in receive queue */
buf = skb_peek(&sk->sk_receive_queue);