tipc: some cleanups in the file discover.c

To facilitate the coming changes in the neighbor discovery functionality
we make some renaming and refactoring of that code. The functional changes
in this commit are trivial, e.g., that we move the message sending call in
tipc_disc_timeout() outside the spinlock protected region.

Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/bearer.c

@@ -210,7 +210,7 @@ void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
 	rcu_read_lock();
 	b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 	if (b)
-		tipc_disc_add_dest(b->link_req);
+		tipc_disc_add_dest(b->disc);
 	rcu_read_unlock();
 }
 
@@ -222,7 +222,7 @@ void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
 	rcu_read_lock();
 	b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
 	if (b)
-		tipc_disc_remove_dest(b->link_req);
+		tipc_disc_remove_dest(b->disc);
 	rcu_read_unlock();
 }
 
@@ -389,8 +389,8 @@ static void bearer_disable(struct net *net, struct tipc_bearer *b)
 	tipc_node_delete_links(net, bearer_id);
 	b->media->disable_media(b);
 	RCU_INIT_POINTER(b->media_ptr, NULL);
-	if (b->link_req)
-		tipc_disc_delete(b->link_req);
+	if (b->disc)
+		tipc_disc_delete(b->disc);
 	RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
 	kfree_rcu(b, rcu);
 	tipc_mon_delete(net, bearer_id);

net/tipc/bearer.h

@@ -159,7 +159,7 @@ struct tipc_bearer {
 	u32 tolerance;
 	u32 domain;
 	u32 identity;
-	struct tipc_link_req *link_req;
+	struct tipc_discoverer *disc;
 	char net_plane;
 	unsigned long up;
 };