Some fixes for user resources management

sql/sql_parse.cc

@@ -160,7 +160,7 @@ static int get_or_create_user_conn(THD *thd, const char *user,
     uc->connections = 1;
     uc->questions=uc->updates=uc->conn_per_hour=0;
     uc->user_resources=*mqh;
-    if (mqh->connections > max_user_connections) 
+    if (max_user_connections && mqh->connections > max_user_connections) 
       uc->user_resources.connections = max_user_connections;
     uc->intime=thd->thr_create_time;
     if (hash_insert(&hash_user_connections, (byte*) uc))
@@ -298,7 +298,7 @@ static int check_for_max_user_connections(USER_CONN *uc)
     goto end;
   }
   uc->connections++; 
-if (uc->user_resources.connections &&  uc->conn_per_hour++ >= uc->user_resources.connections)
+  if (uc->user_resources.connections &&  uc->conn_per_hour++ >= uc->user_resources.connections)
   {
     net_printf(&current_thd->net, ER_USER_LIMIT_REACHED, uc->user, "max_connections",
 	       (long) uc->user_resources.connections);
@@ -317,12 +317,7 @@ static void decrease_user_connections(USER_CONN *uc)
 */
 
   DBUG_ENTER("decrease_user_connections");
-  if (mqh_used)
-  {
-    if (uc->conn_per_hour) 
-      uc->conn_per_hour--;
-  }
-  else if (!--uc->connections)
+  if (!mqh_used && uc->connections && !--uc->connections)
   {
     /* Last connection for user; Delete it */
     (void) pthread_mutex_lock(&LOCK_user_conn);