class: move driver core specific parts to a private structure
This moves the portions of struct class that are dynamic (kobject and
lock and lists) out of the main structure and into a dynamic, private,
structure.
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 3918d0e..06f09c9 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -21,17 +21,16 @@
#include "base.h"
#define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
-#define to_class(obj) container_of(obj, struct class, subsys.kobj)
static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct class_attribute *class_attr = to_class_attr(attr);
- struct class *dc = to_class(kobj);
+ struct class_private *cp = to_class(kobj);
ssize_t ret = -EIO;
if (class_attr->show)
- ret = class_attr->show(dc, buf);
+ ret = class_attr->show(cp->class, buf);
return ret;
}
@@ -39,17 +38,18 @@
const char *buf, size_t count)
{
struct class_attribute *class_attr = to_class_attr(attr);
- struct class *dc = to_class(kobj);
+ struct class_private *cp = to_class(kobj);
ssize_t ret = -EIO;
if (class_attr->store)
- ret = class_attr->store(dc, buf, count);
+ ret = class_attr->store(cp->class, buf, count);
return ret;
}
static void class_release(struct kobject *kobj)
{
- struct class *class = to_class(kobj);
+ struct class_private *cp = to_class(kobj);
+ struct class *class = cp->class;
pr_debug("class '%s': release.\n", class->name);
@@ -78,7 +78,7 @@
{
int error;
if (cls)
- error = sysfs_create_file(&cls->subsys.kobj, &attr->attr);
+ error = sysfs_create_file(&cls->p->subsys.kobj, &attr->attr);
else
error = -EINVAL;
return error;
@@ -87,21 +87,20 @@
void class_remove_file(struct class *cls, const struct class_attribute *attr)
{
if (cls)
- sysfs_remove_file(&cls->subsys.kobj, &attr->attr);
+ sysfs_remove_file(&cls->p->subsys.kobj, &attr->attr);
}
static struct class *class_get(struct class *cls)
{
if (cls)
- return container_of(kset_get(&cls->subsys),
- struct class, subsys);
- return NULL;
+ kset_get(&cls->p->subsys);
+ return cls;
}
static void class_put(struct class *cls)
{
if (cls)
- kset_put(&cls->subsys);
+ kset_put(&cls->p->subsys);
}
static int add_class_attrs(struct class *cls)
@@ -136,17 +135,23 @@
int class_register(struct class *cls)
{
+ struct class_private *cp;
int error;
pr_debug("device class '%s': registering\n", cls->name);
- INIT_LIST_HEAD(&cls->devices);
- INIT_LIST_HEAD(&cls->interfaces);
- kset_init(&cls->class_dirs);
- init_MUTEX(&cls->sem);
- error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name);
- if (error)
+ cp = kzalloc(sizeof(*cp), GFP_KERNEL);
+ if (!cp)
+ return -ENOMEM;
+ INIT_LIST_HEAD(&cp->devices);
+ INIT_LIST_HEAD(&cp->interfaces);
+ kset_init(&cp->class_dirs);
+ init_MUTEX(&cp->sem);
+ error = kobject_set_name(&cp->subsys.kobj, "%s", cls->name);
+ if (error) {
+ kfree(cp);
return error;
+ }
/* set the default /sys/dev directory for devices of this class */
if (!cls->dev_kobj)
@@ -155,17 +160,21 @@
#if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK)
/* let the block class directory show up in the root of sysfs */
if (cls != &block_class)
- cls->subsys.kobj.kset = class_kset;
+ cp->subsys.kobj.kset = class_kset;
#else
- cls->subsys.kobj.kset = class_kset;
+ cp->subsys.kobj.kset = class_kset;
#endif
- cls->subsys.kobj.ktype = &class_ktype;
+ cp->subsys.kobj.ktype = &class_ktype;
+ cp->class = cls;
+ cls->p = cp;
- error = kset_register(&cls->subsys);
- if (!error) {
- error = add_class_attrs(class_get(cls));
- class_put(cls);
+ error = kset_register(&cp->subsys);
+ if (error) {
+ kfree(cp);
+ return error;
}
+ error = add_class_attrs(class_get(cls));
+ class_put(cls);
return error;
}
@@ -173,7 +182,7 @@
{
pr_debug("device class '%s': unregistering\n", cls->name);
remove_class_attrs(cls);
- kset_unregister(&cls->subsys);
+ kset_unregister(&cls->p->subsys);
}
static void class_create_release(struct class *cls)
@@ -280,8 +289,8 @@
if (!class)
return -EINVAL;
- down(&class->sem);
- list_for_each_entry(dev, &class->devices, node) {
+ down(&class->p->sem);
+ list_for_each_entry(dev, &class->p->devices, node) {
if (start) {
if (start == dev)
start = NULL;
@@ -293,7 +302,7 @@
if (error)
break;
}
- up(&class->sem);
+ up(&class->p->sem);
return error;
}
@@ -330,8 +339,8 @@
if (!class)
return NULL;
- down(&class->sem);
- list_for_each_entry(dev, &class->devices, node) {
+ down(&class->p->sem);
+ list_for_each_entry(dev, &class->p->devices, node) {
if (start) {
if (start == dev)
start = NULL;
@@ -344,7 +353,7 @@
} else
put_device(dev);
}
- up(&class->sem);
+ up(&class->p->sem);
return found ? dev : NULL;
}
@@ -362,13 +371,13 @@
if (!parent)
return -EINVAL;
- down(&parent->sem);
- list_add_tail(&class_intf->node, &parent->interfaces);
+ down(&parent->p->sem);
+ list_add_tail(&class_intf->node, &parent->p->interfaces);
if (class_intf->add_dev) {
- list_for_each_entry(dev, &parent->devices, node)
+ list_for_each_entry(dev, &parent->p->devices, node)
class_intf->add_dev(dev, class_intf);
}
- up(&parent->sem);
+ up(&parent->p->sem);
return 0;
}
@@ -381,13 +390,13 @@
if (!parent)
return;
- down(&parent->sem);
+ down(&parent->p->sem);
list_del_init(&class_intf->node);
if (class_intf->remove_dev) {
- list_for_each_entry(dev, &parent->devices, node)
+ list_for_each_entry(dev, &parent->p->devices, node)
class_intf->remove_dev(dev, class_intf);
}
- up(&parent->sem);
+ up(&parent->p->sem);
class_put(parent);
}
