diff --git a/mbtk/libgsw_lib/gsw_uart_interface.c b/mbtk/libgsw_lib/gsw_uart_interface.c
index 0544d16..d16fa69 100755
--- a/mbtk/libgsw_lib/gsw_uart_interface.c
+++ b/mbtk/libgsw_lib/gsw_uart_interface.c
@@ -305,6 +305,8 @@
 
 void gsw_uart_flush(int fd)
 {
+    if (handle())
+        return;
     if (tcflush(fd, TCIOFLUSH) < 0)
     {
         LOGE("flush fail\n");
@@ -410,6 +412,8 @@
 
 void gsw_uart_close(int fd)
 {
+    if (handle())
+        return;
     if (fd <= 0)
         LOGE("fd = %d fail\n",fd);
         //return GSW_HAL_NORMAL_FAIL;