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xen: balloon: Use static attribute groups for sysfs entries 

Instead of manual calls of device_create_file(), device_remove_file()
and sysfs_create_group(), assign static attribute groups to the device
to register.  This simplifies the code and avoids possible races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Takashi Iwai 2015-02-05 21:38:59 +01:00 committed by David Vrabel
parent 4644e5ab06
commit b6a473a7e1
1 changed files with 20 additions and 25 deletions
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45
drivers/xen/xen-balloon.c
View File

@ -193,13 +193,18 @@ static DEVICE_ATTR(target, S_IRUGO | S_IWUSR,
show_target, store_target);
static struct device_attribute *balloon_attrs[] = {
&dev_attr_target_kb,
&dev_attr_target,
&dev_attr_schedule_delay.attr,
&dev_attr_max_schedule_delay.attr,
&dev_attr_retry_count.attr,
&dev_attr_max_retry_count.attr
static struct attribute *balloon_attrs[] = {
&dev_attr_target_kb.attr,
&dev_attr_target.attr,
&dev_attr_schedule_delay.attr.attr,
&dev_attr_max_schedule_delay.attr.attr,
&dev_attr_retry_count.attr.attr,
&dev_attr_max_retry_count.attr.attr,
NULL
};
static const struct attribute_group balloon_group = {
.attrs = balloon_attrs
};
static struct attribute *balloon_info_attrs[] = {
@ -214,6 +219,12 @@ static const struct attribute_group balloon_info_group = {
.attrs = balloon_info_attrs
};
static const struct attribute_group *balloon_groups[] = {
&balloon_group,
&balloon_info_group,
NULL
};
static struct bus_type balloon_subsys = {
.name = BALLOON_CLASS_NAME,
.dev_name = BALLOON_CLASS_NAME,
@ -221,7 +232,7 @@ static struct bus_type balloon_subsys = {
static int register_balloon(struct device *dev)
{
int i, error;
int error;
error = subsys_system_register(&balloon_subsys, NULL);
if (error)
@ -229,6 +240,7 @@ static int register_balloon(struct device *dev)
dev->id = 0;
dev->bus = &balloon_subsys;
dev->groups = balloon_groups;
error = device_register(dev);
if (error) {
@ -236,24 +248,7 @@ static int register_balloon(struct device *dev)
return error;
}
for (i = 0; i < ARRAY_SIZE(balloon_attrs); i++) {
error = device_create_file(dev, balloon_attrs[i]);
if (error)
goto fail;
}
error = sysfs_create_group(&dev->kobj, &balloon_info_group);
if (error)
goto fail;
return 0;
fail:
while (--i >= 0)
device_remove_file(dev, balloon_attrs[i]);
device_unregister(dev);
bus_unregister(&balloon_subsys);
return error;
}
MODULE_LICENSE("GPL");