[NET]: Name magic constants in sock_wake_async()

The sock_wake_async() performs a bit different actions
depending on "how" argument. Unfortunately this argument
ony has numerical magic values.

I propose to give names to their constants to help people
reading this function callers understand what's going on
without looking into this function all the time.

I suppose this is 2.6.25 material, but if it's not (or the
naming seems poor/bad/awful), I can rework it against the
current net-2.6 tree.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

11 files changed, 35 insertions, 28 deletions

diff --git a/include/linux/net.h b/include/linux/net.h
index 0235d917d5c3..f95f12c5840c 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -186,6 +186,13 @@ struct net_proto_family {
 struct iovec;
 struct kvec;
 
+enum {
+        SOCK_WAKE_IO,
+        SOCK_WAKE_WAITD,
+        SOCK_WAKE_SPACE,
+        SOCK_WAKE_URG,
+};
+
 extern int           sock_wake_async(struct socket *sk, int how, int band);
 extern int           sock_register(const struct net_proto_family *fam);
 extern void          sock_unregister(int family);
diff --git a/net/atm/common.c b/net/atm/common.c
index eba09a04f6bf..c865517ba449 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -113,7 +113,7 @@ static void vcc_write_space(struct sock *sk)
                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
                         wake_up_interruptible(sk->sk_sleep);
 
-                sk_wake_async(sk, 2, POLL_OUT);
+                sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
         }
 
         read_unlock(&sk->sk_callback_lock);
diff --git a/net/core/sock.c b/net/core/sock.c
index eac7aa0721da..118214047ed2 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1498,7 +1498,7 @@ static void sock_def_error_report(struct sock *sk)
         read_lock(&sk->sk_callback_lock);
         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
                 wake_up_interruptible(sk->sk_sleep);
-        sk_wake_async(sk,0,POLL_ERR);
+        sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
         read_unlock(&sk->sk_callback_lock);
 }
 
@@ -1507,7 +1507,7 @@ static void sock_def_readable(struct sock *sk, int len)
         read_lock(&sk->sk_callback_lock);
         if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
                 wake_up_interruptible(sk->sk_sleep);
-        sk_wake_async(sk,1,POLL_IN);
+        sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
         read_unlock(&sk->sk_callback_lock);
 }
 
@@ -1524,7 +1524,7 @@ static void sock_def_write_space(struct sock *sk)
 
                 /* Should agree with poll, otherwise some programs break */
                 if (sock_writeable(sk))
-                        sk_wake_async(sk, 2, POLL_OUT);
+                        sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
         }
 
         read_unlock(&sk->sk_callback_lock);
@@ -1539,7 +1539,7 @@ void sk_send_sigurg(struct sock *sk)
 {
         if (sk->sk_socket && sk->sk_socket->file)
                 if (send_sigurg(&sk->sk_socket->file->f_owner))
-                        sk_wake_async(sk, 3, POLL_PRI);
+                        sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
 }
 
 void sk_reset_timer(struct sock *sk, struct timer_list* timer,
diff --git a/net/core/stream.c b/net/core/stream.c
index b2fb846f42a4..5586879bb9b3 100644
--- a/net/core/stream.c
+++ b/net/core/stream.c
@@ -35,7 +35,7 @@ void sk_stream_write_space(struct sock *sk)
                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
                         wake_up_interruptible(sk->sk_sleep);
                 if (sock->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
-                        sock_wake_async(sock, 2, POLL_OUT);
+                        sock_wake_async(sock, SOCK_WAKE_SPACE, POLL_OUT);
         }
 }
 
diff --git a/net/dccp/input.c b/net/dccp/input.c
index df0fb2c149a6..ef299fbd7c26 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -37,7 +37,7 @@ static void dccp_rcv_close(struct sock *sk, struct sk_buff *skb)
         dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED);
         dccp_fin(sk, skb);
         dccp_set_state(sk, DCCP_CLOSED);
-        sk_wake_async(sk, 1, POLL_HUP);
+        sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP);
 }
 
 static void dccp_rcv_closereq(struct sock *sk, struct sk_buff *skb)
@@ -90,7 +90,7 @@ static void dccp_rcv_reset(struct sock *sk, struct sk_buff *skb)
         dccp_fin(sk, skb);
 
         if (err && !sock_flag(sk, SOCK_DEAD))
-                sk_wake_async(sk, 0, POLL_ERR);
+                sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
         dccp_time_wait(sk, DCCP_TIME_WAIT, 0);
 }
 
@@ -416,7 +416,7 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
 
                 if (!sock_flag(sk, SOCK_DEAD)) {
                         sk->sk_state_change(sk);
-                        sk_wake_async(sk, 0, POLL_OUT);
+                        sk_wake_async(sk, SOCK_WAKE_IO, POLL_OUT);
                 }
 
                 if (sk->sk_write_pending || icsk->icsk_ack.pingpong ||
@@ -624,7 +624,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                 switch (old_state) {
                 case DCCP_PARTOPEN:
                         sk->sk_state_change(sk);
-                        sk_wake_async(sk, 0, POLL_OUT);
+                        sk_wake_async(sk, SOCK_WAKE_IO, POLL_OUT);
                         break;
                 }
         } else if (unlikely(dh->dccph_type == DCCP_PKT_SYNC)) {
diff --git a/net/dccp/output.c b/net/dccp/output.c
index f49544618f20..33ce737ef3a8 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -170,7 +170,7 @@ void dccp_write_space(struct sock *sk)
                 wake_up_interruptible(sk->sk_sleep);
         /* Should agree with poll, otherwise some programs break */
         if (sock_writeable(sk))
-                sk_wake_async(sk, 2, POLL_OUT);
+                sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 
         read_unlock(&sk->sk_callback_lock);
 }
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 79996b16b942..97ea3eda206d 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3595,9 +3595,9 @@ static void tcp_fin(struct sk_buff *skb, struct sock *sk, struct tcphdr *th)
                 /* Do not send POLL_HUP for half duplex close. */
                 if (sk->sk_shutdown == SHUTDOWN_MASK ||
                     sk->sk_state == TCP_CLOSE)
-                        sk_wake_async(sk, 1, POLL_HUP);
+                        sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP);
                 else
-                        sk_wake_async(sk, 1, POLL_IN);
+                        sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
         }
 }
 
@@ -4956,7 +4956,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 
                 if (!sock_flag(sk, SOCK_DEAD)) {
                         sk->sk_state_change(sk);
-                        sk_wake_async(sk, 0, POLL_OUT);
+                        sk_wake_async(sk, SOCK_WAKE_IO, POLL_OUT);
                 }
 
                 if (sk->sk_write_pending ||
@@ -5186,9 +5186,9 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                                  * are not waked up, because sk->sk_sleep ==
                                  * NULL and sk->sk_socket == NULL.
                                  */
-                                if (sk->sk_socket) {
-                                        sk_wake_async(sk,0,POLL_OUT);
-                                }
+                                if (sk->sk_socket)
+                                        sk_wake_async(sk,
+                                                        SOCK_WAKE_IO, POLL_OUT);
 
                                 tp->snd_una = TCP_SKB_CB(skb)->ack_seq;
                                 tp->snd_wnd = ntohs(th->window) <<
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index d6389450c4bf..5e82f1c0afbb 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -65,7 +65,7 @@ static void rxrpc_write_space(struct sock *sk)
         if (rxrpc_writable(sk)) {
                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
                         wake_up_interruptible(sk->sk_sleep);
-                sk_wake_async(sk, 2, POLL_OUT);
+                sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
         }
         read_unlock(&sk->sk_callback_lock);
 }
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index ea9649ca0b2a..dc2f9221f092 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -6008,7 +6008,8 @@ static void __sctp_write_space(struct sctp_association *asoc)
                          */
                         if (sock->fasync_list &&
                             !(sk->sk_shutdown & SEND_SHUTDOWN))
-                                sock_wake_async(sock, 2, POLL_OUT);
+                                sock_wake_async(sock,
+                                                SOCK_WAKE_SPACE, POLL_OUT);
                 }
         }
 }
diff --git a/net/socket.c b/net/socket.c
index aeeab388cc38..9ebca5c695d6 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1070,20 +1070,19 @@ int sock_wake_async(struct socket *sock, int how, int band)
         if (!sock || !sock->fasync_list)
                 return -1;
         switch (how) {
-        case 1:
-
+        case SOCK_WAKE_WAITD:
                 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
                         break;
                 goto call_kill;
-        case 2:
+        case SOCK_WAKE_SPACE:
                 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
                         break;
                 /* fall through */
-        case 0:
+        case SOCK_WAKE_IO:
 call_kill:
                 __kill_fasync(sock->fasync_list, SIGIO, band);
                 break;
-        case 3:
+        case SOCK_WAKE_URG:
                 __kill_fasync(sock->fasync_list, SIGURG, band);
         }
         return 0;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 0f1ecbf86d0f..393197afb190 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -317,7 +317,7 @@ static void unix_write_space(struct sock *sk)
         if (unix_writable(sk)) {
                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
                         wake_up_interruptible_sync(sk->sk_sleep);
-                sk_wake_async(sk, 2, POLL_OUT);
+                sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
         }
         read_unlock(&sk->sk_callback_lock);
 }
@@ -403,7 +403,7 @@ static int unix_release_sock (struct sock *sk, int embrion)
                         unix_state_unlock(skpair);
                         skpair->sk_state_change(skpair);
                         read_lock(&skpair->sk_callback_lock);
-                        sk_wake_async(skpair,1,POLL_HUP);
+                        sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP);
                         read_unlock(&skpair->sk_callback_lock);
                 }
                 sock_put(skpair); /* It may now die */
@@ -1900,9 +1900,9 @@ static int unix_shutdown(struct socket *sock, int mode)
                         other->sk_state_change(other);
                         read_lock(&other->sk_callback_lock);
                         if (peer_mode == SHUTDOWN_MASK)
-                                sk_wake_async(other,1,POLL_HUP);
+                                sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP);
                         else if (peer_mode & RCV_SHUTDOWN)
-                                sk_wake_async(other,1,POLL_IN);
+                                sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN);
                         read_unlock(&other->sk_callback_lock);
                 }
                 if (other)