From 1e19dde4442ab6cf58a332f62181495ad574f3f9 Mon Sep 17 00:00:00 2001
From: Mifacopy <mifacopy@users.noreply.github.com>
Date: Sun, 15 Mar 2026 13:37:58 +0800
Subject: [PATCH] drivers: net: slip: fix NPD bug in sl_tx_timeout()

Backported from https://github.com/torvalds/linux/commit/ec4eb8a86ade4d22633e1da2a7d85a846b7d1798
---
 drivers/net/slip/slip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/slip/slip.c b/drivers/net/slip/slip.c
index a17d86a577..b351b68420 100644
--- a/drivers/net/slip/slip.c
+++ b/drivers/net/slip/slip.c
@@ -464,7 +464,7 @@ static void sl_tx_timeout(struct net_device *dev)
 	spin_lock(&sl->lock);
 
 	if (netif_queue_stopped(dev)) {
-		if (!netif_running(dev))
+		if (!netif_running(dev) || !sl->tty)
 			goto out;
 
 		/* May be we must check transmitter timeout here ?