diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index 459ab52793cb98591a1535a8a18d0d8c9977abc4..e73c6e3794e364e375038c1c03a58511dcd2f07c 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -55,15 +55,15 @@ 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)
+    static rt_bool_t init_ok = RT_FALSE;
+
+    if (init_ok)
     {
         rt_kprintf("dfs already init.\n");
-        return 0;        
+        return 0;
     }
-    init_ok = 1;	
 
     /* clear filesystem operations table */
     memset((void *)filesystem_operation_table, 0, sizeof(filesystem_operation_table));
@@ -92,6 +92,8 @@ int dfs_init(void)
     }
 #endif
 
+    init_ok = RT_TRUE;
+
     return 0;
 }
 INIT_PREV_EXPORT(dfs_init);
@@ -505,13 +507,13 @@ struct dfs_fdtable* dfs_fdtable_get(void)
 {
     struct dfs_fdtable *fdt;
 #ifdef RT_USING_LWP
-	struct rt_lwp *lwp;
+    struct rt_lwp *lwp;
 
-	lwp = (struct rt_lwp *)rt_thread_self()->user_data;
+    lwp = (struct rt_lwp *)rt_thread_self()->user_data;
     if (lwp)
-		fdt = &lwp->fdt;
-	else
-		fdt = &_fdtab;
+        fdt = &lwp->fdt;
+    else
+        fdt = &_fdtab;
 #else
     fdt = &_fdtab;
 #endif
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 316b970048cc42a457a20aac5eebf7e275fda753..97d962e63e8fafbc68498792fa7349e58e10fc1b 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
@@ -98,7 +98,7 @@ static void tcpip_init_done_callback(void *arg)
 
             /* leave critical */
             rt_exit_critical();
-			LOCK_TCPIP_CORE();
+            LOCK_TCPIP_CORE();
 
             netif_add(ethif->netif, &ipaddr, &netmask, &gw,
                       ethif, netif_device_init, tcpip_input);
@@ -121,7 +121,7 @@ static void tcpip_init_done_callback(void *arg)
                 netif_set_link_up(ethif->netif);
             }
 
-			UNLOCK_TCPIP_CORE();
+            UNLOCK_TCPIP_CORE();
             /* enter critical */
             rt_enter_critical();
         }
@@ -136,18 +136,17 @@ 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;
+    static rt_bool_t init_ok = RT_FALSE;
 
-    if(init_ok)
+    if (init_ok)
     {
         rt_kprintf("lwip system already init.\n");
-        return 0;        
+        return 0;
     }
-    init_ok = 1;
 
     eth_system_device_init_private();
 
@@ -189,6 +188,8 @@ int lwip_system_init(void)
 #endif
     rt_kprintf("lwIP-%d.%d.%d initialized!\n", LWIP_VERSION_MAJOR, LWIP_VERSION_MINOR, LWIP_VERSION_REVISION);
 
+    init_ok = RT_TRUE;
+
     return 0;
 }
 INIT_PREV_EXPORT(lwip_system_init);