netdev - [PATCH net 1/2] net: cpsw_new: Fix unnecessary netdev unregistration in cpsw

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Message-Id: <20260205-cpsw-error-path-v1-1-6e58bae6b299@gmail.com>
Date: Thu, 05 Feb 2026 10:47:02 +0800
From: Kevin Hao <haokexin@...il.com>
To: netdev@...r.kernel.org
Cc: Siddharth Vadapalli <s-vadapalli@...com>, 
 Roger Quadros <rogerq@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Vladimir Oltean <vladimir.oltean@....com>, 
 Saeed Mahameed <saeedm@...dia.com>, Daniel Zahka <daniel.zahka@...il.com>, 
 Lorenzo Bianconi <lorenzo@...nel.org>, 
 Alexander Sverdlin <alexander.sverdlin@...il.com>, 
 Nicolas Dichtel <nicolas.dichtel@...nd.com>, 
 Murali Karicheri <m-karicheri2@...com>, 
 Ilias Apalodimas <ilias.apalodimas@...aro.org>, 
 Grygorii Strashko <grygorii.strashko@...com>, linux-omap@...r.kernel.org, 
 stable@...r.kernel.org, Kevin Hao <haokexin@...il.com>
Subject: [PATCH net 1/2] net: cpsw_new: Fix unnecessary netdev
 unregistration in cpsw_probe() error path

The current error handling in cpsw_probe() has two issues:
- cpsw_unregister_ports() may be called before cpsw_register_ports() has
  been executed.

- cpsw_unregister_ports() is already invoked within cpsw_register_ports()
  in case of a register_netdev() failure, but the error path would call
  it again.

Fixes: ed3525eda4c4 ("net: ethernet: ti: introduce cpsw switchdev based driver part 1 - dual-emac")
Signed-off-by: Kevin Hao <haokexin@...il.com>
Cc: stable@...r.kernel.org
---
 drivers/net/ethernet/ti/cpsw_new.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c
index 21af0a10626aaf0ce6ecb04837899801743f3894..b9fc31eb06134dae33427eaba06341c39eb4b41c 100644
--- a/drivers/net/ethernet/ti/cpsw_new.c
+++ b/drivers/net/ethernet/ti/cpsw_new.c
@@ -2003,7 +2003,7 @@ static int cpsw_probe(struct platform_device *pdev)
 	/* setup netdevs */
 	ret = cpsw_create_ports(cpsw);
 	if (ret)
-		goto clean_unregister_netdev;
+		goto clean_cpts;
 
 	/* Grab RX and TX IRQs. Note that we also have RX_THRESHOLD and
 	 * MISC IRQs which are always kept disabled with this driver so
@@ -2017,14 +2017,14 @@ static int cpsw_probe(struct platform_device *pdev)
 			       0, dev_name(dev), cpsw);
 	if (ret < 0) {
 		dev_err(dev, "error attaching irq (%d)\n", ret);
-		goto clean_unregister_netdev;
+		goto clean_cpts;
 	}
 
 	ret = devm_request_irq(dev, cpsw->irqs_table[1], cpsw_tx_interrupt,
 			       0, dev_name(dev), cpsw);
 	if (ret < 0) {
 		dev_err(dev, "error attaching irq (%d)\n", ret);
-		goto clean_unregister_netdev;
+		goto clean_cpts;
 	}
 
 	if (!cpsw->cpts)
@@ -2034,7 +2034,7 @@ static int cpsw_probe(struct platform_device *pdev)
 			       0, dev_name(&pdev->dev), cpsw);
 	if (ret < 0) {
 		dev_err(dev, "error attaching misc irq (%d)\n", ret);
-		goto clean_unregister_netdev;
+		goto clean_cpts;
 	}
 
 	/* Enable misc CPTS evnt_pend IRQ */
@@ -2043,7 +2043,7 @@ static int cpsw_probe(struct platform_device *pdev)
 skip_cpts:
 	ret = cpsw_register_notifiers(cpsw);
 	if (ret)
-		goto clean_unregister_netdev;
+		goto clean_cpts;
 
 	ret = cpsw_register_devlink(cpsw);
 	if (ret)
@@ -2065,8 +2065,6 @@ static int cpsw_probe(struct platform_device *pdev)
 
 clean_unregister_notifiers:
 	cpsw_unregister_notifiers(cpsw);
-clean_unregister_netdev:
-	cpsw_unregister_ports(cpsw);
 clean_cpts:
 	cpts_release(cpsw->cpts);
 	cpdma_ctlr_destroy(cpsw->dma);

-- 
2.52.0