Add net_stack_cleanup()

Add a cleanup function net_stack_cleanup() that calls a new NetStack::ShutDown() method.
Make sure this method works even if the network stack was never initialized.

Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>

headers/private/kernel/boot/net/NetStack.h

@@ -26,6 +26,7 @@ private:
 public:
 	static status_t CreateDefault();
 	static NetStack *Default();
+	static status_t ShutDown();
 
 	status_t AddEthernetInterface(EthernetInterface *interface);
 
@@ -53,6 +54,7 @@ private:
 // afterwards, which is supposed to add network interfaces.
 status_t net_stack_init();
 status_t platform_net_stack_init();
+status_t net_stack_cleanup();
 
 
 #endif	// _BOOT_NET_STACK_H

src/system/boot/loader/net/NetStack.cpp

@@ -120,6 +120,19 @@ NetStack::Default()
 	return sNetStack;
 }
 
+
+status_t
+NetStack::ShutDown()
+{
+	if (sNetStack != NULL) {
+		delete sNetStack;
+		sNetStack = NULL;
+	}
+
+	return B_OK;
+}
+
+
 // AddEthernetInterface
 status_t
 NetStack::AddEthernetInterface(EthernetInterface *interface)
@@ -155,3 +168,9 @@ net_stack_init()
 	return platform_net_stack_init();
 }
 
+
+status_t
+net_stack_cleanup()
+{
+	return NetStack::ShutDown();
+}