Commit 0c3141e9 authored by Allan Stephens's avatar Allan Stephens Committed by David S. Miller
Browse files

[TIPC]: Overhaul of socket locking logic 



This patch modifies TIPC's socket code to follow the same approach
used by other protocols.  This change eliminates the need for a
mutex in the TIPC-specific portion of the socket protocol data
structure -- in its place, the standard Linux socket backlog queue
and associated locking routines are utilized.  These changes fix
a long-standing receive queue bug on SMP systems, and also enable
individual read and write threads to utilize a socket without
unnecessarily interfering with each other.

Signed-off-by: default avatarAllan Stephens <allan.stephens@windriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b89741a0

include/net/tipc/tipc_port.h

+6 −0
Original line number Diff line number Diff line
@@ -96,6 +96,12 @@ struct tipc_port *tipc_get_port(const u32 ref); 


void *tipc_get_handle(const u32 ref);



/*

 * The following routines require that the port be locked on entry

 */



int tipc_disconnect_port(struct tipc_port *tp_ptr);





#endif

net/tipc/port.c

+24 −7
Original line number Diff line number Diff line
@@ -1240,6 +1240,28 @@ exit: 
	return res;

}



/**

 * tipc_disconnect_port - disconnect port from peer

 *

 * Port must be locked.

 */



int tipc_disconnect_port(struct tipc_port *tp_ptr)

{

	int res;



	if (tp_ptr->connected) {

		tp_ptr->connected = 0;

		/* let timer expire on it's own to avoid deadlock! */

		tipc_nodesub_unsubscribe(

			&((struct port *)tp_ptr)->subscription);

		res = TIPC_OK;

	} else {

		res = -ENOTCONN;

	}

	return res;

}



/*

 * tipc_disconnect(): Disconnect port form peer.

 *                    This is a node local operation.
@@ -1248,17 +1270,12 @@ exit: 
int tipc_disconnect(u32 ref)

{

	struct port *p_ptr;

	int res = -ENOTCONN;

	int res;



	p_ptr = tipc_port_lock(ref);

	if (!p_ptr)

		return -EINVAL;

	if (p_ptr->publ.connected) {

		p_ptr->publ.connected = 0;

		/* let timer expire on it's own to avoid deadlock! */

		tipc_nodesub_unsubscribe(&p_ptr->subscription);

		res = TIPC_OK;

	}

	res = tipc_disconnect_port((struct tipc_port *)p_ptr);

	tipc_port_unlock(p_ptr);

	return res;

}

net/tipc/socket.c

+578 −424

File changed.

Preview size limit exceeded, changes collapsed.

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