netdev - [PATCH net-next v2 04/11] net: stmmac: fix stmmac_xdp_open() clk_ptp

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Message-Id: <E1uwfBY-00000004j8j-2FtN@rmk-PC.armlinux.org.uk>
Date: Thu, 11 Sep 2025 12:09:52 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	bpf@...r.kernel.org,
	Daniel Borkmann <daniel@...earbox.net>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Gatien CHEVALLIER <gatien.chevallier@...s.st.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>
Subject: [PATCH net-next v2 04/11] net: stmmac: fix stmmac_xdp_open()
 clk_ptp_ref error cleanup

Neither stmmac_xdp_release() nor the normal paths of stmmac_xdp_open()
touch clk_ptp_ref, so stmmac_xdp_open() should not be doing anything
with this clock. However, in its error path, it calls
stmmac_hw_teardown() which disables and unprepares this clock, which
can lead to the clock state becoming unbalanced when the netdev is
taken administratively down.

Remove this call to stmmac_hw_teardown(), and as this is the last user
of this function, remove the function as well.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 167405aac5b8..8cb1a97e18af 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3568,13 +3568,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool ptp_register)
 	return 0;
 }
 
-static void stmmac_hw_teardown(struct net_device *dev)
-{
-	struct stmmac_priv *priv = netdev_priv(dev);
-
-	clk_disable_unprepare(priv->plat->clk_ptp_ref);
-}
-
 static void stmmac_free_irq(struct net_device *dev,
 			    enum request_irq_err irq_err, int irq_idx)
 {
@@ -6992,7 +6985,6 @@ int stmmac_xdp_open(struct net_device *dev)
 	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
 		hrtimer_cancel(&priv->dma_conf.tx_queue[chan].txtimer);
 
-	stmmac_hw_teardown(dev);
 init_error:
 	free_dma_desc_resources(priv, &priv->dma_conf);
 dma_desc_error:
-- 
2.47.3