netdev - [PATCH net-next 5/6] net: stmmac: move PHY handling out of __stmmac

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Message-Id: <E1v11A3-0000000774G-3PKY@rmk-PC.armlinux.org.uk>
Date: Tue, 23 Sep 2025 12:26:19 +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>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	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>
Subject: [PATCH net-next 5/6] net: stmmac: move PHY handling out of
 __stmmac_open()/release()

Move the PHY attachment/detachment from the network driver out of
__stmmac_open() and __stmmac_release() into stmmac_open() and
stmmac_release() where these actions will only happen when the
interface is administratively brought up or down. It does not make
sense to detach and re-attach the PHY during a change of MTU.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 29 +++++++++++--------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 4acd180d2da8..4844d563e291 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3937,10 +3937,6 @@ static int __stmmac_open(struct net_device *dev,
 	u32 chan;
 	int ret;
 
-	ret = stmmac_init_phy(dev);
-	if (ret)
-		return ret;
-
 	for (int i = 0; i < MTL_MAX_TX_QUEUES; i++)
 		if (priv->dma_conf.tx_queue[i].tbs & STMMAC_TBS_EN)
 			dma_conf->tx_queue[i].tbs = priv->dma_conf.tx_queue[i].tbs;
@@ -3990,7 +3986,6 @@ static int __stmmac_open(struct net_device *dev,
 
 	stmmac_release_ptp(priv);
 init_error:
-	phylink_disconnect_phy(priv->phylink);
 	return ret;
 }
 
@@ -4010,18 +4005,28 @@ static int stmmac_open(struct net_device *dev)
 
 	ret = pm_runtime_resume_and_get(priv->device);
 	if (ret < 0)
-		goto err;
+		goto err_dma_resources;
+
+	ret = stmmac_init_phy(dev);
+	if (ret)
+		goto err_runtime_pm;
 
 	ret = __stmmac_open(dev, dma_conf);
-	if (ret) {
-		pm_runtime_put(priv->device);
-err:
-		free_dma_desc_resources(priv, dma_conf);
-	}
+	if (ret)
+		goto err_disconnect_phy;
 
 	kfree(dma_conf);
 
 	return ret;
+
+err_disconnect_phy:
+	phylink_disconnect_phy(priv->phylink);
+err_runtime_pm:
+	pm_runtime_put(priv->device);
+err_dma_resources:
+	free_dma_desc_resources(priv, dma_conf);
+	kfree(dma_conf);
+	return ret;
 }
 
 static void __stmmac_release(struct net_device *dev)
@@ -4038,7 +4043,6 @@ static void __stmmac_release(struct net_device *dev)
 
 	/* Stop and disconnect the PHY */
 	phylink_stop(priv->phylink);
-	phylink_disconnect_phy(priv->phylink);
 
 	stmmac_disable_all_queues(priv);
 
@@ -4078,6 +4082,7 @@ static int stmmac_release(struct net_device *dev)
 
 	__stmmac_release(dev);
 
+	phylink_disconnect_phy(priv->phylink);
 	pm_runtime_put(priv->device);
 
 	return 0;
-- 
2.47.3