diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index f2a6e71..656e29c 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -126,6 +126,17 @@ static void emulate_large_send_offload(struct sk_buff *skb)
 }
 #endif /* LOOPBACK_TSO */
 
+static int enough_stack_space(void)
+{
+#ifdef CONFIG_STACK_GROWSUP
+	return 0;
+#else
+	unsigned long free = (unsigned long)&free -
+			     (unsigned long)end_of_stack(current);
+	return free >= THREAD_SIZE/3 ;
+#endif
+}
+
 /*
  * The higher levels take care of making this non-reentrant (it's
  * called with bh's disabled).
@@ -158,7 +169,14 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
 	lb_stats->bytes += skb->len;
 	lb_stats->packets++;
 
-	netif_rx(skb);
+	/*
+	 * We can call netif_receive_skb() instead of netif_rx()
+	 * to speedup processing, but only if we have enough stack space.
+	 */
+	if (enough_stack_space())
+		netif_receive_skb(skb);
+	else
+		netif_rx(skb);
 
 	return 0;
 }