Index: sys/dev/mlx4/mlx4_core/mlx4_main.c
===================================================================
--- sys/dev/mlx4/mlx4_core/mlx4_main.c
+++ sys/dev/mlx4/mlx4_core/mlx4_main.c
@@ -1160,6 +1160,8 @@
 	return err;
 }
 
+static DEFINE_MUTEX(mlx4_set_port_type_mutex);
+
 static ssize_t set_port_type(struct device *dev,
 			     struct device_attribute *attr,
 			     const char *buf, size_t count)
@@ -1168,10 +1170,9 @@
 						   port_attr);
 	struct mlx4_dev *mdev = info->dev;
 	enum mlx4_port_type port_type;
-	static DEFINE_MUTEX(set_port_type_mutex);
 	int err;
 
-	mutex_lock(&set_port_type_mutex);
+	mutex_lock(&mlx4_set_port_type_mutex);
 
 	if (!strcmp(buf, "ib\n")) {
 		port_type = MLX4_PORT_TYPE_IB;
@@ -1188,7 +1189,7 @@
 	err = __set_port_type(info, port_type);
 
 err_out:
-	mutex_unlock(&set_port_type_mutex);
+	mutex_unlock(&mlx4_set_port_type_mutex);
 
 	return err ? err : count;
 }