Linux-libre 4.5-gnu

1 files changed, 27 insertions, 19 deletions

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 898a53a56..f75f847e6 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -451,7 +451,7 @@ static void unix_write_space(struct sock *sk)
 	rcu_read_lock();
 	if (unix_writable(sk)) {
 		wq = rcu_dereference(sk->sk_wq);
-		if (wq_has_sleeper(wq))
+		if (skwq_has_sleeper(wq))
 			wake_up_interruptible_sync_poll(&wq->wait,
 				POLLOUT | POLLWRNORM | POLLWRBAND);
 		sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
@@ -2113,8 +2113,8 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
 	struct scm_cookie scm;
 	struct sock *sk = sock->sk;
 	struct unix_sock *u = unix_sk(sk);
-	int noblock = flags & MSG_DONTWAIT;
-	struct sk_buff *skb;
+	struct sk_buff *skb, *last;
+	long timeo;
 	int err;
 	int peeked, skip;
 
@@ -2122,30 +2122,38 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
 	if (flags&MSG_OOB)
 		goto out;
 
-	err = mutex_lock_interruptible(&u->readlock);
-	if (unlikely(err)) {
-		/* recvmsg() in non blocking mode is supposed to return -EAGAIN
-		 * sk_rcvtimeo is not honored by mutex_lock_interruptible()
-		 */
-		err = noblock ? -EAGAIN : -ERESTARTSYS;
-		goto out;
-	}
+	timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 
-	skip = sk_peek_offset(sk, flags);
+	do {
+		mutex_lock(&u->readlock);
 
-	skb = __skb_recv_datagram(sk, flags, &peeked, &skip, &err);
-	if (!skb) {
+		skip = sk_peek_offset(sk, flags);
+		skb = __skb_try_recv_datagram(sk, flags, &peeked, &skip, &err,
+					      &last);
+		if (skb)
+			break;
+
+		mutex_unlock(&u->readlock);
+
+		if (err != -EAGAIN)
+			break;
+	} while (timeo &&
+		 !__skb_wait_for_more_packets(sk, &err, &timeo, last));
+
+	if (!skb) { /* implies readlock unlocked */
 		unix_state_lock(sk);
 		/* Signal EOF on disconnected non-blocking SEQPACKET socket. */
 		if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN &&
 		    (sk->sk_shutdown & RCV_SHUTDOWN))
 			err = 0;
 		unix_state_unlock(sk);
-		goto out_unlock;
+		goto out;
 	}
 
-	wake_up_interruptible_sync_poll(&u->peer_wait,
-					POLLOUT | POLLWRNORM | POLLWRBAND);
+	if (wq_has_sleeper(&u->peer_wait))
+		wake_up_interruptible_sync_poll(&u->peer_wait,
+						POLLOUT | POLLWRNORM |
+						POLLWRBAND);
 
 	if (msg->msg_name)
 		unix_copy_addr(msg, skb->sk);
@@ -2197,7 +2205,6 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
 
 out_free:
 	skb_free_datagram(sk, skb);
-out_unlock:
 	mutex_unlock(&u->readlock);
 out:
 	return err;
@@ -2305,6 +2312,7 @@ static int unix_stream_read_generic(struct unix_stream_read_state *state)
 		bool drop_skb;
 		struct sk_buff *skb, *last;
 
+redo:
 		unix_state_lock(sk);
 		if (sock_flag(sk, SOCK_DEAD)) {
 			err = -ECONNRESET;
@@ -2346,7 +2354,7 @@ again:
 			}
 
 			mutex_lock(&u->readlock);
-			continue;
+			goto redo;
 unlock:
 			unix_state_unlock(sk);
 			break;