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: ed3525e ("net: ethernet: ti: introduce cpsw switchdev based driver part 1 - dual-emac")
Signed-off-by: Kevin Hao <[email protected]>
Cc: [email protected]
Reviewed-by: Alexander Sverdlin <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: haokexin

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);