diff --git a/components/net/lwip-1.4.0/src/arch/include/arch/cc.h b/components/net/lwip-1.4.0/src/arch/include/arch/cc.h
index cad3411cc93c648d05966d452fd9d0843a895337..1f18a8dd50f7f67ef0b44bf4b1c231cc48301c37 100644
--- a/components/net/lwip-1.4.0/src/arch/include/arch/cc.h
+++ b/components/net/lwip-1.4.0/src/arch/include/arch/cc.h
@@ -92,9 +92,6 @@ void sys_arch_assert(const char* file, int line);
 #define LWIP_PLATFORM_DIAG(x)	do {rt_kprintf x;} while(0)
 #define LWIP_PLATFORM_ASSERT(x) { rt_kprintf(x); sys_arch_assert(__FILE__, __LINE__); }
 
-#define SYS_ARCH_DECL_PROTECT(x)
-#define SYS_ARCH_PROTECT(x)
-#define SYS_ARCH_UNPROTECT(x)
 
 #include "string.h"
 
diff --git a/components/net/lwip-1.4.0/src/arch/sys_arch.c b/components/net/lwip-1.4.0/src/arch/sys_arch.c
index a2a63364126a62c009eb04f26c2c9406652d40ec..4c4c120670a6694ec4f44b6240ad8b61f69888b2 100644
--- a/components/net/lwip-1.4.0/src/arch/sys_arch.c
+++ b/components/net/lwip-1.4.0/src/arch/sys_arch.c
@@ -491,12 +491,22 @@ sys_thread_t sys_thread_new(const char *name, lwip_thread_fn thread, void *arg,
 
 sys_prot_t sys_arch_protect(void)
 {
+	rt_base_t level;
+
 	/* disable interrupt */
-	return rt_hw_interrupt_disable();
+	level = rt_hw_interrupt_disable();
+
+	/* must also lock scheduler */
+	rt_enter_critical();
+
+	return level;
 }
 
 void sys_arch_unprotect(sys_prot_t pval)
 {
+	/* unlock scheduler */
+	rt_exit_critical();
+
 	/* enable interrupt */
 	rt_hw_interrupt_enable(pval);
 
diff --git a/components/net/lwip/src/arch/include/arch/cc.h b/components/net/lwip/src/arch/include/arch/cc.h
index cad3411cc93c648d05966d452fd9d0843a895337..1f18a8dd50f7f67ef0b44bf4b1c231cc48301c37 100644
--- a/components/net/lwip/src/arch/include/arch/cc.h
+++ b/components/net/lwip/src/arch/include/arch/cc.h
@@ -92,9 +92,6 @@ void sys_arch_assert(const char* file, int line);
 #define LWIP_PLATFORM_DIAG(x)	do {rt_kprintf x;} while(0)
 #define LWIP_PLATFORM_ASSERT(x) { rt_kprintf(x); sys_arch_assert(__FILE__, __LINE__); }
 
-#define SYS_ARCH_DECL_PROTECT(x)
-#define SYS_ARCH_PROTECT(x)
-#define SYS_ARCH_UNPROTECT(x)
 
 #include "string.h"
 
diff --git a/components/net/lwip/src/arch/sys_arch.c b/components/net/lwip/src/arch/sys_arch.c
index e878a70e3038e1d71a797e7967474f3f453b836c..57ead3d755d27190e6acddd8aa62acb6d75620d5 100644
--- a/components/net/lwip/src/arch/sys_arch.c
+++ b/components/net/lwip/src/arch/sys_arch.c
@@ -224,20 +224,29 @@ sys_thread_t sys_thread_new(char *name, void (* thread)(void *arg), void *arg, i
 	return t;
 }
 
-sys_prot_t sys_arch_protect(void)
-{
-	/* disable interrupt */
-	return rt_hw_interrupt_disable();
+sys_prot_t sys_arch_protect(void)
+{
+	rt_base_t level;
+
+	/* disable interrupt */
+	level = rt_hw_interrupt_disable();
+
+	/* must also lock scheduler */
+	rt_enter_critical();
+
+	return level;
+}
+
+void sys_arch_unprotect(sys_prot_t pval)
+{
+	/* unlock scheduler */
+	rt_exit_critical();
+
+	/* enable interrupt */
+	rt_hw_interrupt_enable(pval);
+
+	return;
 }
-
-void sys_arch_unprotect(sys_prot_t pval)
-{
-	/* enable interrupt */
-	rt_hw_interrupt_enable(pval);
-
-	return;
-}
-
 void sys_arch_assert(const char* file, int line)
 {
 	rt_kprintf("\nAssertion: %d in %s, thread %s\n", line, file,