tipc: always use tipc_node_lock() to hold node lock

Although we obtain node lock with tipc_node_lock() in most time, there
are still places where we directly use native spin lock interface
to grab node lock. But as we will do more jobs in the future when node
lock is released, we should ensure that tipc_node_lock() is always
called when node lock is taken.

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

net/tipc/link.c

@@ -297,27 +297,27 @@ void tipc_link_delete_list(unsigned int bearer_id, bool shutting_down)
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
-		spin_lock_bh(&n_ptr->lock);
+		tipc_node_lock(n_ptr);
 		l_ptr = n_ptr->links[bearer_id];
 		if (l_ptr) {
 			tipc_link_reset(l_ptr);
 			if (shutting_down || !tipc_node_is_up(n_ptr)) {
 				tipc_node_detach_link(l_ptr->owner, l_ptr);
 				tipc_link_reset_fragments(l_ptr);
-				spin_unlock_bh(&n_ptr->lock);
+				tipc_node_unlock(n_ptr);
 
 				/* Nobody else can access this link now: */
 				del_timer_sync(&l_ptr->timer);
 				kfree(l_ptr);
 			} else {
 				/* Detach/delete when failover is finished: */
 				l_ptr->flags |= LINK_STOPPED;
-				spin_unlock_bh(&n_ptr->lock);
+				tipc_node_unlock(n_ptr);
 				del_timer_sync(&l_ptr->timer);
 			}
 			continue;
 		}
-		spin_unlock_bh(&n_ptr->lock);
+		tipc_node_unlock(n_ptr);
 	}
 	rcu_read_unlock();
 }
@@ -474,11 +474,11 @@ void tipc_link_reset_list(unsigned int bearer_id)
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
-		spin_lock_bh(&n_ptr->lock);
+		tipc_node_lock(n_ptr);
 		l_ptr = n_ptr->links[bearer_id];
 		if (l_ptr)
 			tipc_link_reset(l_ptr);
-		spin_unlock_bh(&n_ptr->lock);
+		tipc_node_unlock(n_ptr);
 	}
 	rcu_read_unlock();
 }

net/tipc/name_distr.c

@@ -135,18 +135,18 @@ void named_cluster_distribute(struct sk_buff *buf)
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
-		spin_lock_bh(&n_ptr->lock);
+		tipc_node_lock(n_ptr);
 		l_ptr = n_ptr->active_links[n_ptr->addr & 1];
 		if (l_ptr) {
 			buf_copy = skb_copy(buf, GFP_ATOMIC);
 			if (!buf_copy) {
-				spin_unlock_bh(&n_ptr->lock);
+				tipc_node_unlock(n_ptr);
 				break;
 			}
 			msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
 			__tipc_link_xmit(l_ptr, buf_copy);
 		}
-		spin_unlock_bh(&n_ptr->lock);
+		tipc_node_unlock(n_ptr);
 	}
 	rcu_read_unlock();