ipv6: move in6_dev_finish_destroy() into core kernel

in6_dev_put() will be needed by vxlan module, so is
in6_dev_finish_destroy().

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/addrconf.c

@@ -304,36 +304,6 @@ err_ip:
 	return -ENOMEM;
 }
 
-static void snmp6_free_dev(struct inet6_dev *idev)
-{
-	kfree(idev->stats.icmpv6msgdev);
-	kfree(idev->stats.icmpv6dev);
-	snmp_mib_free((void __percpu **)idev->stats.ipv6);
-}
-
-/* Nobody refers to this device, we may destroy it. */
-
-void in6_dev_finish_destroy(struct inet6_dev *idev)
-{
-	struct net_device *dev = idev->dev;
-
-	WARN_ON(!list_empty(&idev->addr_list));
-	WARN_ON(idev->mc_list != NULL);
-	WARN_ON(timer_pending(&idev->rs_timer));
-
-#ifdef NET_REFCNT_DEBUG
-	pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
-#endif
-	dev_put(dev);
-	if (!idev->dead) {
-		pr_warn("Freeing alive inet6 device %p\n", idev);
-		return;
-	}
-	snmp6_free_dev(idev);
-	kfree_rcu(idev, rcu);
-}
-EXPORT_SYMBOL(in6_dev_finish_destroy);
-
 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 {
 	struct inet6_dev *ndev;

net/ipv6/addrconf_core.c

@@ -6,6 +6,7 @@
 #include <linux/export.h>
 #include <net/ipv6.h>
 #include <net/addrconf.h>
+#include <net/ip.h>
 
 #define IPV6_ADDR_SCOPE_TYPE(scope)	((scope) << 16)
 
@@ -117,3 +118,33 @@ const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL
 EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
 EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
+
+static void snmp6_free_dev(struct inet6_dev *idev)
+{
+	kfree(idev->stats.icmpv6msgdev);
+	kfree(idev->stats.icmpv6dev);
+	snmp_mib_free((void __percpu **)idev->stats.ipv6);
+}
+
+/* Nobody refers to this device, we may destroy it. */
+
+void in6_dev_finish_destroy(struct inet6_dev *idev)
+{
+	struct net_device *dev = idev->dev;
+
+	WARN_ON(!list_empty(&idev->addr_list));
+	WARN_ON(idev->mc_list != NULL);
+	WARN_ON(timer_pending(&idev->rs_timer));
+
+#ifdef NET_REFCNT_DEBUG
+	pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
+#endif
+	dev_put(dev);
+	if (!idev->dead) {
+		pr_warn("Freeing alive inet6 device %p\n", idev);
+		return;
+	}
+	snmp6_free_dev(idev);
+	kfree_rcu(idev, rcu);
+}
+EXPORT_SYMBOL(in6_dev_finish_destroy);