fs: dlm: use WARN_ON_ONCE() instead of WARN_ON()

To not get the console spammed about WARN_ON() of invalid states in the
dlm midcomms hot path handling we switch to WARN_ON_ONCE() to get it
only once that there might be an issue with the midcomms state handling.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/midcomms.c

@@ -469,7 +469,7 @@ static void dlm_pas_fin_ack_rcv(struct midcomms_node *node)
 		spin_unlock(&node->state_lock);
 		log_print("%s: unexpected state: %d\n",
 			  __func__, node->state);
-		WARN_ON(1);
+		WARN_ON_ONCE(1);
 		return;
 	}
 	spin_unlock(&node->state_lock);
@@ -540,7 +540,7 @@ static void dlm_midcomms_receive_buffer(union dlm_packet *p,
 				spin_unlock(&node->state_lock);
 				log_print("%s: unexpected state: %d\n",
 					  __func__, node->state);
-				WARN_ON(1);
+				WARN_ON_ONCE(1);
 				return;
 			}
 			spin_unlock(&node->state_lock);
@@ -548,7 +548,7 @@ static void dlm_midcomms_receive_buffer(union dlm_packet *p,
 			set_bit(DLM_NODE_FLAG_STOP_RX, &node->flags);
 			break;
 		default:
-			WARN_ON(test_bit(DLM_NODE_FLAG_STOP_RX, &node->flags));
+			WARN_ON_ONCE(test_bit(DLM_NODE_FLAG_STOP_RX, &node->flags));
 			dlm_receive_buffer_3_2_trace(seq, p);
 			dlm_receive_buffer(p, node->nodeid);
 			set_bit(DLM_NODE_ULP_DELIVERED, &node->flags);
@@ -770,7 +770,7 @@ static void dlm_midcomms_receive_buffer_3_2(union dlm_packet *p, int nodeid)
 			goto out;
 		}
 
-		WARN_ON(test_bit(DLM_NODE_FLAG_STOP_RX, &node->flags));
+		WARN_ON_ONCE(test_bit(DLM_NODE_FLAG_STOP_RX, &node->flags));
 		dlm_receive_buffer(p, nodeid);
 		break;
 	case DLM_OPTS:
@@ -1095,7 +1095,7 @@ struct dlm_mhandle *dlm_midcomms_get_mhandle(int nodeid, int len,
 	}
 
 	/* this is a bug, however we going on and hope it will be resolved */
-	WARN_ON(test_bit(DLM_NODE_FLAG_STOP_TX, &node->flags));
+	WARN_ON_ONCE(test_bit(DLM_NODE_FLAG_STOP_TX, &node->flags));
 
 	mh = dlm_allocate_mhandle(allocation);
 	if (!mh)
@@ -1127,7 +1127,7 @@ struct dlm_mhandle *dlm_midcomms_get_mhandle(int nodeid, int len,
 		break;
 	default:
 		dlm_free_mhandle(mh);
-		WARN_ON(1);
+		WARN_ON_ONCE(1);
 		goto err;
 	}
 
@@ -1196,7 +1196,7 @@ void dlm_midcomms_commit_mhandle(struct dlm_mhandle *mh,
 		break;
 	default:
 		srcu_read_unlock(&nodes_srcu, mh->idx);
-		WARN_ON(1);
+		WARN_ON_ONCE(1);
 		break;
 	}
 }
@@ -1238,7 +1238,7 @@ static void dlm_act_fin_ack_rcv(struct midcomms_node *node)
 		spin_unlock(&node->state_lock);
 		log_print("%s: unexpected state: %d\n",
 			  __func__, node->state);
-		WARN_ON(1);
+		WARN_ON_ONCE(1);
 		return;
 	}
 	spin_unlock(&node->state_lock);
@@ -1356,7 +1356,7 @@ static void midcomms_node_release(struct rcu_head *rcu)
 {
 	struct midcomms_node *node = container_of(rcu, struct midcomms_node, rcu);
 
-	WARN_ON(atomic_read(&node->send_queue_cnt));
+	WARN_ON_ONCE(atomic_read(&node->send_queue_cnt));
 	kfree(node);
 }