net: ti: icss-iep: fix device and OF node leaks at probe

Make sure to drop the references to the IEP OF node and device taken by
of_parse_phandle() and of_find_device_by_node() when looking up IEP
devices during probe.

Drop the bogus additional reference taken on successful lookup so that
the device is released correctly by icss_iep_put().

Fixes: c1e0230 ("net: ti: icss-iep: Add IEP driver")
Cc: stable@vger.kernel.org	# 6.6
Cc: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250725171213.880-6-johan@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: jhovold

drivers/net/ethernet/ti/icssg/icss_iep.c

@@ -685,11 +685,17 @@ struct icss_iep *icss_iep_get_idx(struct device_node *np, int idx)
 	struct platform_device *pdev;
 	struct device_node *iep_np;
 	struct icss_iep *iep;
+	int ret;
 
 	iep_np = of_parse_phandle(np, "ti,iep", idx);
-	if (!iep_np || !of_device_is_available(iep_np))
+	if (!iep_np)
 		return ERR_PTR(-ENODEV);
 
+	if (!of_device_is_available(iep_np)) {
+		of_node_put(iep_np);
+		return ERR_PTR(-ENODEV);
+	}
+
 	pdev = of_find_device_by_node(iep_np);
 	of_node_put(iep_np);
 
@@ -698,21 +704,28 @@ struct icss_iep *icss_iep_get_idx(struct device_node *np, int idx)
 		return ERR_PTR(-EPROBE_DEFER);
 
 	iep = platform_get_drvdata(pdev);
-	if (!iep)
-		return ERR_PTR(-EPROBE_DEFER);
+	if (!iep) {
+		ret = -EPROBE_DEFER;
+		goto err_put_pdev;
+	}
 
 	device_lock(iep->dev);
 	if (iep->client_np) {
 		device_unlock(iep->dev);
 		dev_err(iep->dev, "IEP is already acquired by %s",
 			iep->client_np->name);
-		return ERR_PTR(-EBUSY);
+		ret = -EBUSY;
+		goto err_put_pdev;
 	}
 	iep->client_np = np;
 	device_unlock(iep->dev);
-	get_device(iep->dev);
 
 	return iep;
+
+err_put_pdev:
+	put_device(&pdev->dev);
+
+	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(icss_iep_get_idx);