misc: rp1-pio: More logical probe sequence

Sort the probe function initialisation into a more logical order.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

Author: pelwell

drivers/misc/rp1-pio.c

@@ -1153,6 +1153,10 @@ static int rp1_pio_probe(struct platform_device *pdev)
 			return -EINVAL;
 	}
 
+	pdev->id = of_alias_get_id(pdev->dev.of_node, "pio");
+	if (pdev->id < 0)
+		return dev_err_probe(dev, pdev->id, "alias is missing\n");
+
 	fw = devm_rp1_firmware_get(dev, dev->of_node);
 	if (IS_ERR(fw))
 		return PTR_ERR(fw);
@@ -1185,44 +1189,39 @@ static int rp1_pio_probe(struct platform_device *pdev)
 		goto out_err;
 	}
 
-	cdev_init(&pio->cdev, &rp1_pio_fops);
-	ret = cdev_add(&pio->cdev, pio->dev_num, 1);
-	if (ret) {
-		dev_err(dev, "cdev_add failed (err %d)\n", ret);
-		goto out_unregister;
-	}
-
 	pio->dev_class = class_create(DRIVER_NAME);
 	if (IS_ERR(pio->dev_class)) {
 		ret = PTR_ERR(pio->dev_class);
 		dev_err(dev, "class_create failed (err %d)\n", ret);
-		goto out_cdev_del;
+		goto out_unregister;
 	}
-	pdev->id = of_alias_get_id(pdev->dev.of_node, "pio");
-	if (pdev->id < 0) {
-		dev_err(dev, "alias is missing\n");
-		return -EINVAL;
+
+	cdev_init(&pio->cdev, &rp1_pio_fops);
+	ret = cdev_add(&pio->cdev, pio->dev_num, 1);
+	if (ret) {
+		dev_err(dev, "cdev_add failed (err %d)\n", ret);
 		goto out_class_destroy;
 	}
+
 	sprintf(dev_name, "pio%d", pdev->id);
 	cdev = device_create(pio->dev_class, NULL, pio->dev_num, NULL, dev_name);
 	if (IS_ERR(cdev)) {
 		ret = PTR_ERR(cdev);
 		dev_err(dev, "%s: device_create failed (err %d)\n", __func__, ret);
-		goto out_class_destroy;
+		goto out_cdev_del;
 	}
 
 	g_pio = pio;
 
 	dev_info(dev, "Created instance as %s\n", dev_name);
 	return 0;
 
-out_class_destroy:
-	class_destroy(pio->dev_class);
-
 out_cdev_del:
 	cdev_del(&pio->cdev);
 
+out_class_destroy:
+	class_destroy(pio->dev_class);
+
 out_unregister:
 	unregister_chrdev_region(pio->dev_num, 1);