openwrt/target/linux/generic/backport-5.15/775-v6.0-02-net-ethernet-stmicro-stmmac-first-disable-all-queues.patch

From 7028471edb646bfc532fec0973e50e784cdcb7c6 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Sat, 23 Jul 2022 16:29:30 +0200
Subject: [PATCH 2/5] net: ethernet: stmicro: stmmac: first disable all queues
 and disconnect in release

Disable all queues and disconnect before tx_disable in stmmac_release to
prevent a corner case where packet may be still queued at the same time
tx_disable is called resulting in kernel panic if some packet still has
to be processed.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3809,8 +3809,6 @@ static int stmmac_release(struct net_dev
 	struct stmmac_priv *priv = netdev_priv(dev);
 	u32 chan;
 
-	netif_tx_disable(dev);
-
 	if (device_may_wakeup(priv->device))
 		phylink_speed_down(priv->phylink, false);
 	/* Stop and disconnect the PHY */
@@ -3822,6 +3820,8 @@ static int stmmac_release(struct net_dev
 	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
 		hrtimer_cancel(&priv->tx_queue[chan].txtimer);
 
+	netif_tx_disable(dev);
+
 	/* Free the IRQ lines */
 	stmmac_free_irq(dev, REQ_IRQ_ERR_ALL, 0);