From e49a29f2dc306213a73a4f3c68d1ac9a34f49d9a Mon Sep 17 00:00:00 2001
From: aozima <wuyangyong@gmail.com>
Date: Mon, 2 Jul 2018 09:56:12 +0800
Subject: [PATCH 1/3] [shell] add re-initial check.

---
 components/finsh/shell.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/components/finsh/shell.c b/components/finsh/shell.c
index 6bdb418120..66a0141de2 100644
--- a/components/finsh/shell.c
+++ b/components/finsh/shell.c
@@ -726,6 +726,12 @@ int finsh_system_init(void)
     rt_err_t result = RT_EOK;
     rt_thread_t tid;
 
+    if(shell)
+    {
+        rt_kprintf("finsh shell already init.\n");
+        return RT_EOK;
+    }
+
 #ifdef FINSH_USING_SYMTAB
 #ifdef __CC_ARM                 /* ARM C Compiler */
     extern const int FSymTab$$Base;

From 000fe93b9f416be3d08805b71b8d1eb51b9818fe Mon Sep 17 00:00:00 2001
From: aozima <wuyangyong@gmail.com>
Date: Mon, 2 Jul 2018 10:02:16 +0800
Subject: [PATCH 2/3] [lwip] add re-initial check.

---
 components/net/lwip-2.0.2/src/arch/sys_arch.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/components/net/lwip-2.0.2/src/arch/sys_arch.c b/components/net/lwip-2.0.2/src/arch/sys_arch.c
index c8e1fe1d33..316b970048 100644
--- a/components/net/lwip-2.0.2/src/arch/sys_arch.c
+++ b/components/net/lwip-2.0.2/src/arch/sys_arch.c
@@ -136,11 +136,19 @@ static void tcpip_init_done_callback(void *arg)
  * LwIP system initialization
  */
 extern int eth_system_device_init_private(void);
+static volatile uint8_t init_ok = 0;
 int lwip_system_init(void)
 {
     rt_err_t rc;
     struct rt_semaphore done_sem;
-	
+
+    if(init_ok)
+    {
+        rt_kprintf("lwip system already init.\n");
+        return 0;        
+    }
+    init_ok = 1;
+
     eth_system_device_init_private();
 
     /* set default netif to NULL */

From f3fc141f5f9a99a0f1bb7cd731ee4410b43f32f8 Mon Sep 17 00:00:00 2001
From: aozima <wuyangyong@gmail.com>
Date: Mon, 2 Jul 2018 16:57:19 +0800
Subject: [PATCH 3/3] [dfs] add re-initial check.

---
 components/dfs/src/dfs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index fbc0899d36..459ab52793 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -55,8 +55,16 @@ static int  fd_alloc(struct dfs_fdtable *fdt, int startfd);
 /**
  * this function will initialize device file system.
  */
+static volatile uint8_t init_ok = 0;
 int dfs_init(void)
 {
+    if(init_ok)
+    {
+        rt_kprintf("dfs already init.\n");
+        return 0;        
+    }
+    init_ok = 1;	
+
     /* clear filesystem operations table */
     memset((void *)filesystem_operation_table, 0, sizeof(filesystem_operation_table));
     /* clear filesystem table */