net: poll() optimizations
Eric Dumazet [Mon, 6 Sep 2010 11:13:50 +0000 (11:13 +0000)]
No need to test twice sk->sk_shutdown & RCV_SHUTDOWN

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bluetooth/af_bluetooth.c
net/core/datagram.c
net/sctp/socket.c
net/unix/af_unix.c

index 421c45b..ed0f22f 100644 (file)
@@ -297,13 +297,12 @@ unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *w
                mask |= POLLERR;
 
        if (sk->sk_shutdown & RCV_SHUTDOWN)
-               mask |= POLLRDHUP;
+               mask |= POLLRDHUP | POLLIN | POLLRDNORM;
 
        if (sk->sk_shutdown == SHUTDOWN_MASK)
                mask |= POLLHUP;
 
-       if (!skb_queue_empty(&sk->sk_receive_queue) ||
-                       (sk->sk_shutdown & RCV_SHUTDOWN))
+       if (!skb_queue_empty(&sk->sk_receive_queue))
                mask |= POLLIN | POLLRDNORM;
 
        if (sk->sk_state == BT_CLOSED)
index 251997a..4df1b7a 100644 (file)
@@ -746,13 +746,12 @@ unsigned int datagram_poll(struct file *file, struct socket *sock,
        if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
                mask |= POLLERR;
        if (sk->sk_shutdown & RCV_SHUTDOWN)
-               mask |= POLLRDHUP;
+               mask |= POLLRDHUP | POLLIN | POLLRDNORM;
        if (sk->sk_shutdown == SHUTDOWN_MASK)
                mask |= POLLHUP;
 
        /* readable? */
-       if (!skb_queue_empty(&sk->sk_receive_queue) ||
-           (sk->sk_shutdown & RCV_SHUTDOWN))
+       if (!skb_queue_empty(&sk->sk_receive_queue))
                mask |= POLLIN | POLLRDNORM;
 
        /* Connection-based need to check for termination and startup */
index f4bec27..cf6dcc9 100644 (file)
@@ -5707,13 +5707,12 @@ unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
        if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
                mask |= POLLERR;
        if (sk->sk_shutdown & RCV_SHUTDOWN)
-               mask |= POLLRDHUP;
+               mask |= POLLRDHUP | POLLIN | POLLRDNORM;
        if (sk->sk_shutdown == SHUTDOWN_MASK)
                mask |= POLLHUP;
 
        /* Is it readable?  Reconsider this code with TCP-style support.  */
-       if (!skb_queue_empty(&sk->sk_receive_queue) ||
-           (sk->sk_shutdown & RCV_SHUTDOWN))
+       if (!skb_queue_empty(&sk->sk_receive_queue))
                mask |= POLLIN | POLLRDNORM;
 
        /* The association is either gone or not ready.  */
index 4414a18..9077b4e 100644 (file)
@@ -2024,11 +2024,10 @@ static unsigned int unix_poll(struct file *file, struct socket *sock, poll_table
        if (sk->sk_shutdown == SHUTDOWN_MASK)
                mask |= POLLHUP;
        if (sk->sk_shutdown & RCV_SHUTDOWN)
-               mask |= POLLRDHUP;
+               mask |= POLLRDHUP | POLLIN | POLLRDNORM;
 
        /* readable? */
-       if (!skb_queue_empty(&sk->sk_receive_queue) ||
-           (sk->sk_shutdown & RCV_SHUTDOWN))
+       if (!skb_queue_empty(&sk->sk_receive_queue))
                mask |= POLLIN | POLLRDNORM;
 
        /* Connection-based need to check for termination and startup */