diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index eb12f3136a549..7a3ab3427369a 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1967,18 +1967,25 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 					  skb_headlen(skb));
 
 		if (unlikely(headlen > skb_headlen(skb))) {
+			WARN_ON_ONCE(1);
+			err = -ENOMEM;
 			dev_core_stats_rx_dropped_inc(tun->dev);
+napi_busy:
 			napi_free_frags(&tfile->napi);
 			rcu_read_unlock();
 			mutex_unlock(&tfile->napi_mutex);
-			WARN_ON(1);
-			return -ENOMEM;
+			return err;
 		}
 
-		local_bh_disable();
-		napi_gro_frags(&tfile->napi);
-		napi_complete(&tfile->napi);
-		local_bh_enable();
+		if (likely(napi_schedule_prep(&tfile->napi))) {
+			local_bh_disable();
+			napi_gro_frags(&tfile->napi);
+			napi_complete(&tfile->napi);
+			local_bh_enable();
+		} else {
+			err = -EBUSY;
+			goto napi_busy;
+		}
 		mutex_unlock(&tfile->napi_mutex);
 	} else if (tfile->napi_enabled) {
 		struct sk_buff_head *queue = &tfile->sk.sk_write_queue;