[PATCH v2 1/6] ACPI: dock: clean up error handling paths in dock_add()

[Alex Chiang <achiang@hp.com>]

Remove some copy/paste code in our error handling paths, which makes
the function smaller and slightly easier to read.

Signed-off-by: Alex Chiang <achiang@hp.com>
---

 drivers/acpi/dock.c |   75 +++++++++++++++++++--------------------------------
 1 files changed, 28 insertions(+), 47 deletions(-)

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 7338b6a..642c7dd 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -968,11 +968,9 @@ static int dock_add(acpi_handle handle)
 		platform_device_register_simple(dock_device_name,
 			dock_station_count, NULL, 0);
 	dock_device = dock_station->dock_device;
-	if (IS_ERR(dock_device)) {
-		kfree(dock_station);
-		dock_station = NULL;
-		return PTR_ERR(dock_device);
-	}
+	ret = IS_ERR(dock_device) ? PTR_ERR(dock_device) : 0;
+	if (ret)
+		goto out;
 	platform_device_add_data(dock_device, &dock_station,
 		sizeof(struct dock_station *));
 
@@ -987,46 +985,24 @@ static int dock_add(acpi_handle handle)
 		dock_station->flags |= DOCK_IS_BAT;
 
 	ret = device_create_file(&dock_device->dev, &dev_attr_docked);
-	if (ret) {
-		printk(KERN_ERR "Error %d adding sysfs file\n", ret);
-		platform_device_unregister(dock_device);
-		kfree(dock_station);
-		dock_station = NULL;
-		return ret;
-	}
+	if (ret)
+		goto err_unregister;
+
 	ret = device_create_file(&dock_device->dev, &dev_attr_undock);
-	if (ret) {
-		printk(KERN_ERR "Error %d adding sysfs file\n", ret);
-		device_remove_file(&dock_device->dev, &dev_attr_docked);
-		platform_device_unregister(dock_device);
-		kfree(dock_station);
-		dock_station = NULL;
-		return ret;
-	}
+	if (ret)
+		goto err_unregister1;
+
 	ret = device_create_file(&dock_device->dev, &dev_attr_uid);
-	if (ret) {
-		printk(KERN_ERR "Error %d adding sysfs file\n", ret);
-		device_remove_file(&dock_device->dev, &dev_attr_docked);
-		device_remove_file(&dock_device->dev, &dev_attr_undock);
-		platform_device_unregister(dock_device);
-		kfree(dock_station);
-		dock_station = NULL;
-		return ret;
-	}
+	if (ret)
+		goto err_unregister2;
+
 	ret = device_create_file(&dock_device->dev, &dev_attr_flags);
-	if (ret) {
-		printk(KERN_ERR "Error %d adding sysfs file\n", ret);
-		device_remove_file(&dock_device->dev, &dev_attr_docked);
-		device_remove_file(&dock_device->dev, &dev_attr_undock);
-		device_remove_file(&dock_device->dev, &dev_attr_uid);
-		platform_device_unregister(dock_device);
-		kfree(dock_station);
-		dock_station = NULL;
-		return ret;
-	}
+	if (ret)
+		goto err_unregister3;
+
 	ret = device_create_file(&dock_device->dev, &dev_attr_type);
 	if (ret)
-		printk(KERN_ERR"Error %d adding sysfs file\n", ret);
+		goto err_unregister4;
 
 	/* Find dependent devices */
 	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
@@ -1036,10 +1012,8 @@ static int dock_add(acpi_handle handle)
 	/* add the dock station as a device dependent on itself */
 	dd = alloc_dock_dependent_device(handle);
 	if (!dd) {
-		kfree(dock_station);
-		dock_station = NULL;
 		ret = -ENOMEM;
-		goto dock_add_err_unregister;
+		goto err_unregister5;
 	}
 	add_dock_dependent_device(dock_station, dd);
 
@@ -1047,13 +1021,20 @@ static int dock_add(acpi_handle handle)
 	list_add(&dock_station->sibling, &dock_stations);
 	return 0;
 
-dock_add_err_unregister:
+err_unregister5:
 	device_remove_file(&dock_device->dev, &dev_attr_type);
-	device_remove_file(&dock_device->dev, &dev_attr_docked);
-	device_remove_file(&dock_device->dev, &dev_attr_undock);
-	device_remove_file(&dock_device->dev, &dev_attr_uid);
+err_unregister4:
 	device_remove_file(&dock_device->dev, &dev_attr_flags);
+err_unregister3:
+	device_remove_file(&dock_device->dev, &dev_attr_uid);
+err_unregister2:
+	device_remove_file(&dock_device->dev, &dev_attr_undock);
+err_unregister1:
+	device_remove_file(&dock_device->dev, &dev_attr_docked);
+err_unregister:
+	printk(KERN_ERR "%s encountered error %d\n", __func__, ret);
 	platform_device_unregister(dock_device);
+out:
 	kfree(dock_station);
 	dock_station = NULL;
 	return ret;