[TIPC]: First phase of assert() cleanup

This also contains enhancements to simplify comparisons in name table
publication removal algorithm and to simplify name table sanity checking
when shutting down TIPC.
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Per Liden <per.liden@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/link.c

@@ -574,7 +574,6 @@ void tipc_link_wakeup_ports(struct link *l_ptr, int all)
 			break;
 		list_del_init(&p_ptr->wait_list);
 		p_ptr->congested_link = NULL;
-		assert(p_ptr->wakeup);
 		spin_lock_bh(p_ptr->publ.lock);
 		p_ptr->publ.congested = 0;
 		p_ptr->wakeup(&p_ptr->publ);
@@ -1246,8 +1245,6 @@ int tipc_link_send_sections_fast(struct port *sender,
 	int res;
 	u32 selector = msg_origport(hdr) & 1;
 
-	assert(destaddr != tipc_own_addr);
-
 again:
 	/*
 	 * Try building message using port's max_pkt hint.
@@ -2310,7 +2307,6 @@ void tipc_link_tunnel(struct link *l_ptr,
 	memcpy(buf->data + INT_H_SIZE, (unchar *)msg, length);
 	dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
 	msg_dbg(buf_msg(buf), ">SEND>");
-	assert(tunnel);
 	tipc_link_send_buf(tunnel, buf);
 }
 
@@ -2339,10 +2335,10 @@ void tipc_link_changeover(struct link *l_ptr)
 		 ORIGINAL_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
 	msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
 	msg_set_msgcnt(&tunnel_hdr, msgcount);
+
 	if (!l_ptr->first_out) {
 		struct sk_buff *buf;
 
-		assert(!msgcount);
 		buf = buf_acquire(INT_H_SIZE);
 		if (buf) {
 			memcpy(buf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
@@ -2356,6 +2352,7 @@ void tipc_link_changeover(struct link *l_ptr)
 		}
 		return;
 	}
+
 	while (crs) {
 		struct tipc_msg *msg = buf_msg(crs);
 
@@ -2455,11 +2452,15 @@ static int link_recv_changeover_msg(struct link **l_ptr,
 	u32 msg_count = msg_msgcnt(tunnel_msg);
 
 	dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
-	assert(dest_link != *l_ptr);
 	if (!dest_link) {
 		msg_dbg(tunnel_msg, "NOLINK/<REC<");
 		goto exit;
 	}
+	if (dest_link == *l_ptr) {
+		err("Unexpected changeover message on link <%s>\n", 
+		    (*l_ptr)->name);
+		goto exit;
+	}
 	dbg("%c<-%c:", dest_link->b_ptr->net_plane,
 	    (*l_ptr)->b_ptr->net_plane);
 	*l_ptr = dest_link;

net/tipc/name_distr.c

@@ -174,7 +174,6 @@ void tipc_named_node_up(unsigned long node)
 	u32 rest;
 	u32 max_item_buf;
 
-	assert(in_own_cluster(node));
 	read_lock_bh(&tipc_nametbl_lock); 
 	max_item_buf = TIPC_MAX_USER_MSG_SIZE / ITEM_SIZE;
 	max_item_buf *= ITEM_SIZE;
@@ -221,15 +220,24 @@ void tipc_named_node_up(unsigned long node)
 static void node_is_down(struct publication *publ)
 {
 	struct publication *p;
+
         write_lock_bh(&tipc_nametbl_lock);
 	dbg("node_is_down: withdrawing %u, %u, %u\n", 
 	    publ->type, publ->lower, publ->upper);
         publ->key += 1222345;
 	p = tipc_nametbl_remove_publ(publ->type, publ->lower, 
 				     publ->node, publ->ref, publ->key);
-        assert(p == publ);
 	write_unlock_bh(&tipc_nametbl_lock);
-	kfree(publ);
+
+        if (p != publ) {
+		err("Unable to remove publication from failed node\n"
+		    "(type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
+		    publ->type, publ->lower, publ->node, publ->ref, publ->key);
+	}
+
+	if (p) {
+		kfree(p);
+	}
 }
 
 /**
@@ -275,6 +283,12 @@ void tipc_named_recv(struct sk_buff *buf)
 			if (publ) {
 				tipc_nodesub_unsubscribe(&publ->subscr);
         			kfree(publ);
+			} else {
+				err("Unable to remove publication by node 0x%x\n"
+				    "(type=%u, lower=%u, ref=%u, key=%u)\n",
+				    msg_orignode(msg),
+				    ntohl(item->type), ntohl(item->lower),
+				    ntohl(item->ref), ntohl(item->key));
 			}
 		} else {
 			warn("tipc_named_recv: unknown msg\n");

net/tipc/node.c

@@ -234,7 +234,6 @@ struct node *tipc_node_attach_link(struct link *l_ptr)
 		u32 bearer_id = l_ptr->b_ptr->identity;
 		char addr_string[16];
 
-                assert(bearer_id < MAX_BEARERS);
                 if (n_ptr->link_cnt >= 2) {
 			char addr_string[16];
 
@@ -314,7 +313,7 @@ static void node_established_contact(struct node *n_ptr)
 	struct cluster *c_ptr;
 
 	dbg("node_established_contact:-> %x\n", n_ptr->addr);
-	if (!tipc_node_has_active_routes(n_ptr)) { 
+	if (!tipc_node_has_active_routes(n_ptr) && in_own_cluster(n_ptr->addr)) { 
 		tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr);
 	}
 

net/tipc/node_subscr.c

@@ -47,18 +47,19 @@
 void tipc_nodesub_subscribe(struct node_subscr *node_sub, u32 addr, 
 		       void *usr_handle, net_ev_handler handle_down)
 {
+	if (addr == tipc_own_addr) {
 		node_sub->node = NULL;
-	if (addr == tipc_own_addr)
-		return;
-	if (!tipc_addr_node_valid(addr)) {
-		warn("node_subscr with illegal %x\n", addr);
 		return;
 	}
 	
+	node_sub->node = tipc_node_find(addr);
+	if (!node_sub->node) {
+		warn("Node subscription rejected, unknown node 0x%x\n", addr);
+		return;
+	}
 	node_sub->handle_node_down = handle_down;
 	node_sub->usr_handle = usr_handle;
-	node_sub->node = tipc_node_find(addr);
-	assert(node_sub->node);
+
 	tipc_node_lock(node_sub->node);
 	list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
 	tipc_node_unlock(node_sub->node);

net/tipc/port.c

@@ -168,7 +168,6 @@ void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
 	struct port_list *item = dp;
 	int cnt = 0;
 
-	assert(buf);
 	msg = buf_msg(buf);
 
 	/* Create destination port list, if one wasn't supplied */

net/tipc/ref.c

@@ -127,7 +127,14 @@ u32 tipc_ref_acquire(void *object, spinlock_t **lock)
 	u32 next_plus_upper;
 	u32 reference = 0;
 
-	assert(tipc_ref_table.entries && object);
+	if (!object) {
+		err("Attempt to acquire reference to non-existent object\n");
+		return 0;
+	}
+	if (!tipc_ref_table.entries) {
+		err("Reference table not found during acquisition attempt\n");
+		return 0;
+	}
 
 	write_lock_bh(&ref_table_lock);
 	if (tipc_ref_table.first_free) {
@@ -162,15 +169,28 @@ void tipc_ref_discard(u32 ref)
 	u32 index; 
 	u32 index_mask;
 
-	assert(tipc_ref_table.entries);
-	assert(ref != 0);
+	if (!ref) {
+		err("Attempt to discard reference 0\n");
+		return;
+	}
+	if (!tipc_ref_table.entries) {
+		err("Reference table not found during discard attempt\n");
+		return;
+	}
 
 	write_lock_bh(&ref_table_lock);
 	index_mask = tipc_ref_table.index_mask;
 	index = ref & index_mask;
 	entry = &(tipc_ref_table.entries[index]);
-	assert(entry->object != 0);
-	assert(entry->data.reference == ref);
+
+	if (!entry->object) {
+		err("Attempt to discard reference to non-existent object\n");
+		goto exit;
+	}
+	if (entry->data.reference != ref) {
+		err("Attempt to discard non-existent reference\n");
+		goto exit;
+	}
 
 	/* mark entry as unused */
 	entry->object = NULL;
@@ -184,6 +204,7 @@ void tipc_ref_discard(u32 ref)
 
 	/* increment upper bits of entry to invalidate subsequent references */
 	entry->data.next_plus_upper = (ref & ~index_mask) + (index_mask + 1);
+exit:
 	write_unlock_bh(&ref_table_lock);
 }