inet: use call_rcu_hurry() in inet_free_ifa()

This is a followup of commit c4e86b4 ("net: add two more
call_rcu_hurry()")

Our reference to ifa->ifa_dev must be freed ASAP
to release the reference to the netdev the same way.

inet_rcu_free_ifa()

	in_dev_put()
	 -> in_dev_finish_destroy()
	   -> netdev_put()

This should speedup device/netns dismantles when CONFIG_RCU_LAZY=y

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/devinet.c

@@ -224,14 +224,19 @@ static struct in_ifaddr *inet_alloc_ifa(void)
 static void inet_rcu_free_ifa(struct rcu_head *head)
 {
 	struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
+
 	if (ifa->ifa_dev)
 		in_dev_put(ifa->ifa_dev);
 	kfree(ifa);
 }
 
 static void inet_free_ifa(struct in_ifaddr *ifa)
 {
-	call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
+	/* Our reference to ifa->ifa_dev must be freed ASAP
+	 * to release the reference to the netdev the same way.
+	 * in_dev_put() -> in_dev_finish_destroy() -> netdev_put()
+	 */
+	call_rcu_hurry(&ifa->rcu_head, inet_rcu_free_ifa);
 }
 
 static void in_dev_free_rcu(struct rcu_head *head)