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Message-Id: <1408745360-23560-8-git-send-email-jon.maloy@ericsson.com>
Date: Fri, 22 Aug 2014 18:09:10 -0400
From: Jon Maloy <jon.maloy@...csson.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
Paul Gortmaker <paul.gortmaker@...driver.com>,
erik.hugne@...csson.com, ying.xue@...driver.com, maloy@...jonn.com,
tipc-discussion@...ts.sourceforge.net,
Jon Maloy <jon.maloy@...csson.com>
Subject: [PATCH net-next 07/17] tipc: eliminate function tipc_port_shutdown()
tipc_port_shutdown() is a remnant from the now obsolete native
interface. As such it grabs port_lock in order to protect itself
from concurrent BH processing.
However, after the recent changes to the port/socket upcalls, sockets
are now basically single-threaded, and all execution, except the read-only
tipc_sk_timer(), is executing within the protection of lock_sock(). So
the use of port_lock is not needed here.
In this commit we eliminate the whole function, and merge it into its
only caller, tipc_shutdown().
Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
Reviewed-by: Erik Hugne <erik.hugne@...csson.com>
Reviewed-by: Ying Xue <ying.xue@...driver.com>
---
net/tipc/port.c | 24 ------------------------
net/tipc/port.h | 2 --
net/tipc/socket.c | 15 +++++++++++----
3 files changed, 11 insertions(+), 30 deletions(-)
diff --git a/net/tipc/port.c b/net/tipc/port.c
index 6de79f2..3ad092b 100644
--- a/net/tipc/port.c
+++ b/net/tipc/port.c
@@ -385,27 +385,3 @@ int tipc_port_disconnect(u32 ref)
tipc_port_unlock(p_ptr);
return res;
}
-
-/*
- * tipc_port_shutdown(): Send a SHUTDOWN msg to peer and disconnect
- */
-int tipc_port_shutdown(u32 ref)
-{
- struct tipc_msg *msg;
- struct tipc_port *p_ptr;
- struct sk_buff *buf = NULL;
- u32 peer_node;
-
- p_ptr = tipc_port_lock(ref);
- if (!p_ptr)
- return -EINVAL;
- peer_node = tipc_port_peernode(p_ptr);
- buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
- SHORT_H_SIZE, 0, peer_node,
- tipc_own_addr, tipc_port_peerport(p_ptr),
- p_ptr->ref, TIPC_CONN_SHUTDOWN);
- tipc_port_unlock(p_ptr);
- msg = buf_msg(buf);
- tipc_link_xmit(buf, peer_node, msg_link_selector(msg));
- return tipc_port_disconnect(ref);
-}
diff --git a/net/tipc/port.h b/net/tipc/port.h
index 6cdc7de..f5762f9 100644
--- a/net/tipc/port.h
+++ b/net/tipc/port.h
@@ -106,8 +106,6 @@ int tipc_port_connect(u32 portref, struct tipc_portid const *port);
int tipc_port_disconnect(u32 portref);
-int tipc_port_shutdown(u32 ref);
-
/*
* The following routines require that the port be locked on entry
*/
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 5f8376e..f202d47 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1899,7 +1899,7 @@ static int tipc_shutdown(struct socket *sock, int how)
struct tipc_sock *tsk = tipc_sk(sk);
struct tipc_port *port = &tsk->port;
struct sk_buff *buf;
- u32 peer;
+ u32 dnode;
int res;
if (how != SHUT_RDWR)
@@ -1920,10 +1920,17 @@ restart:
goto restart;
}
tipc_port_disconnect(port->ref);
- if (tipc_msg_reverse(buf, &peer, TIPC_CONN_SHUTDOWN))
- tipc_link_xmit(buf, peer, 0);
+ if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN))
+ tipc_link_xmit(buf, dnode, port->ref);
} else {
- tipc_port_shutdown(port->ref);
+ dnode = tipc_port_peernode(port);
+ buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
+ TIPC_CONN_MSG, SHORT_H_SIZE,
+ 0, dnode, tipc_own_addr,
+ tipc_port_peerport(port),
+ port->ref, TIPC_CONN_SHUTDOWN);
+ tipc_link_xmit(buf, dnode, port->ref);
+ __tipc_port_disconnect(port);
}
sock->state = SS_DISCONNECTING;
--
1.7.9.5
--
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