[PATCH AUTOSEL 5.18 85/93] net: ethernet: stmicro: stmmac: first disable all queues and disconnect in release

Sasha Levin
2022-08-11T16:10:55Z

From: Christian Marangi <ansuelsmth@gmail.com>

[ Upstream commit 7028471edb646bfc532fec0973e50e784cdcb7c6 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 98c4abbcd469..fd3671f1bad0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3766,8 +3766,6 @@ static int stmmac_release(struct net_device *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 */
@@ -3779,6 +3777,8 @@ static int stmmac_release(struct net_device *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);

--
2.35.1