[PATCH v4 1/6] ACPI: dock: convert sysfs attributes to an attribute_group

Alex Chiang
2009-10-19T21:14:20Z

As suggested by Dmitry Torokhov, convert the individual sysfs
attributes into an attribute group.

This change eliminates quite a bit of copy/paste code in the
error handling paths.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
---

drivers/acpi/dock.c | 81 +++++++++++++++------------------------------------
1 files changed, 24 insertions(+), 57 deletions(-)

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 7338b6a..4f2aa98 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -936,6 +936,19 @@ static ssize_t show_dock_type(struct device *dev,
}
static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL);

+static struct attribute *dock_attributes[] = {
+ &dev_attr_docked.attr,
+ &dev_attr_flags.attr,
+ &dev_attr_undock.attr,
+ &dev_attr_uid.attr,
+ &dev_attr_type.attr,
+ NULL
+};
+
+static struct attribute_group dock_attribute_group = {
+ .attrs = dock_attributes
+};
+
/**
* dock_add - add a new dock station
* @handle: the dock station handle
@@ -969,9 +982,8 @@ static int dock_add(acpi_handle handle)
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 = PTR_ERR(dock_device);
+ goto out;
}
platform_device_add_data(dock_device, &dock_station,
sizeof(struct dock_station *));
@@ -986,47 +998,9 @@ static int dock_add(acpi_handle handle)
if (is_battery(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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- ret = device_create_file(&dock_device->dev, &dev_attr_type);
+ ret = sysfs_create_group(&dock_device->dev.kobj, &dock_attribute_group);
if (ret)
- printk(KERN_ERR"Error %d adding sysfs file\n", ret);
+ goto err_unregister;

/* Find dependent devices */
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
@@ -1036,10 +1010,8 @@ 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_rmgroup;
}
add_dock_dependent_device(dock_station, dd);

@@ -1047,15 +1019,14 @@ static int dock_add(acpi_handle handle)
list_add(&dock_station->sibling, &dock_stations);
return 0;

-dock_add_err_unregister:
- 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);
- device_remove_file(&dock_device->dev, &dev_attr_flags);
+err_rmgroup:
+ sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group);
+err_unregister:
platform_device_unregister(dock_device);
+out:
kfree(dock_station);
dock_station = NULL;
+ printk(KERN_ERR "%s encountered error %d\n", __func__, ret);
return ret;
}

@@ -1076,11 +1047,7 @@ static int dock_remove(struct dock_station *dock_station)
kfree(dd);

/* cleanup sysfs */
- 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);
- device_remove_file(&dock_device->dev, &dev_attr_flags);
+ sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group);
platform_device_unregister(dock_device);

/* free dock station memory */