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driver-core: merge private parts of class and bus

Browse source 
As classes and busses are pretty much the same thing, and we want to
merge them together into a 'subsystem' in the future, let us share the
same private data parts to make that merge easier.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers 2010-11-15 23:13:18 +01:00 committed by Greg Kroah-Hartman
parent 14c05aa399
commit 6b6e39a6a8
5 changed files with 64 additions and 78 deletions
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58
drivers/base/base.h
View file

@ -1,10 +1,11 @@
/** /**
* struct bus_type_private - structure to hold the private to the driver core portions of the bus_type structure. * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure.
* *
* @subsys - the struct kset that defines this bus. This is the main kobject * @subsys - the struct kset that defines this subsystem
* @drivers_kset - the list of drivers associated with this bus * @devices_kset - the list of devices associated
* @devices_kset - the list of devices associated with this bus *
* @drivers_kset - the list of drivers associated
* @klist_devices - the klist to iterate over the @devices_kset * @klist_devices - the klist to iterate over the @devices_kset
* @klist_drivers - the klist to iterate over the @drivers_kset * @klist_drivers - the klist to iterate over the @drivers_kset
* @bus_notifier - the bus notifier list for anything that cares about things * @bus_notifier - the bus notifier list for anything that cares about things
@ -12,20 +13,34 @@
* @bus - pointer back to the struct bus_type that this structure is associated * @bus - pointer back to the struct bus_type that this structure is associated
* with. * with.
* *
* @class_interfaces - list of class_interfaces associated
* @glue_dirs - "glue" directory to put in-between the parent device to
* avoid namespace conflicts
* @class_mutex - mutex to protect the children, devices, and interfaces lists.
* @class - pointer back to the struct class that this structure is associated
* with.
*
* This structure is the one that is the actual kobject allowing struct * This structure is the one that is the actual kobject allowing struct
* bus_type to be statically allocated safely. Nothing outside of the driver * bus_type/class to be statically allocated safely. Nothing outside of the
* core should ever touch these fields. * driver core should ever touch these fields.
*/ */
struct bus_type_private { struct subsys_private {
struct kset subsys; struct kset subsys;
struct kset *drivers_kset;
struct kset *devices_kset; struct kset *devices_kset;
struct kset *drivers_kset;
struct klist klist_devices; struct klist klist_devices;
struct klist klist_drivers; struct klist klist_drivers;
struct blocking_notifier_head bus_notifier; struct blocking_notifier_head bus_notifier;
unsigned int drivers_autoprobe:1; unsigned int drivers_autoprobe:1;
struct bus_type *bus; struct bus_type *bus;
struct list_head class_interfaces;
struct kset glue_dirs;
struct mutex class_mutex;
struct class *class;
}; };
#define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj)
struct driver_private { struct driver_private {
struct kobject kobj; struct kobject kobj;
@ -36,33 +51,6 @@ struct driver_private {
}; };
#define to_driver(obj) container_of(obj, struct driver_private, kobj) #define to_driver(obj) container_of(obj, struct driver_private, kobj)
/**
* struct class_private - structure to hold the private to the driver core portions of the class structure.
*
* @class_subsys - the struct kset that defines this class. This is the main kobject
* @class_devices - list of devices associated with this class
* @class_interfaces - list of class_interfaces associated with this class
* @class_dirs - "glue" directory for virtual devices associated with this class
* @class_mutex - mutex to protect the children, devices, and interfaces lists.
* @class - pointer back to the struct class that this structure is associated
* with.
*
* This structure is the one that is the actual kobject allowing struct
* class to be statically allocated safely. Nothing outside of the driver
* core should ever touch these fields.
*/
struct class_private {
struct kset class_subsys;
struct klist class_devices;
struct list_head class_interfaces;
struct kset class_dirs;
struct mutex class_mutex;
struct class *class;
};
#define to_class(obj) \
container_of(obj, struct class_private, class_subsys.kobj)
/** /**
* struct device_private - structure to hold the private to the driver core portions of the device structure. * struct device_private - structure to hold the private to the driver core portions of the device structure.
* *

13
drivers/base/bus.c
View file

@ -20,7 +20,6 @@
#include "power/power.h" #include "power/power.h"
#define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr) #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
#define to_bus(obj) container_of(obj, struct bus_type_private, subsys.kobj)
/* /*
* sysfs bindings for drivers * sysfs bindings for drivers
@ -96,11 +95,11 @@ static ssize_t bus_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf) char *buf)
{ {
struct bus_attribute *bus_attr = to_bus_attr(attr); struct bus_attribute *bus_attr = to_bus_attr(attr);
struct bus_type_private *bus_priv = to_bus(kobj); struct subsys_private *subsys_priv = to_subsys_private(kobj);
ssize_t ret = 0; ssize_t ret = 0;
if (bus_attr->show) if (bus_attr->show)
ret = bus_attr->show(bus_priv->bus, buf); ret = bus_attr->show(subsys_priv->bus, buf);
return ret; return ret;
} }
@ -108,11 +107,11 @@ static ssize_t bus_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count) const char *buf, size_t count)
{ {
struct bus_attribute *bus_attr = to_bus_attr(attr); struct bus_attribute *bus_attr = to_bus_attr(attr);
struct bus_type_private *bus_priv = to_bus(kobj); struct subsys_private *subsys_priv = to_subsys_private(kobj);
ssize_t ret = 0; ssize_t ret = 0;
if (bus_attr->store) if (bus_attr->store)
ret = bus_attr->store(bus_priv->bus, buf, count); ret = bus_attr->store(subsys_priv->bus, buf, count);
return ret; return ret;
} }
@ -858,9 +857,9 @@ static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
int bus_register(struct bus_type *bus) int bus_register(struct bus_type *bus)
{ {
int retval; int retval;
struct bus_type_private *priv; struct subsys_private *priv;
priv = kzalloc(sizeof(struct bus_type_private), GFP_KERNEL); priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL);
if (!priv) if (!priv)
return -ENOMEM; return -ENOMEM;

38
drivers/base/class.c
View file

@ -27,7 +27,7 @@ static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf) char *buf)
{ {
struct class_attribute *class_attr = to_class_attr(attr); struct class_attribute *class_attr = to_class_attr(attr);
struct class_private *cp = to_class(kobj); struct subsys_private *cp = to_subsys_private(kobj);
ssize_t ret = -EIO; ssize_t ret = -EIO;
if (class_attr->show) if (class_attr->show)
@ -39,7 +39,7 @@ static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count) const char *buf, size_t count)
{ {
struct class_attribute *class_attr = to_class_attr(attr); struct class_attribute *class_attr = to_class_attr(attr);
struct class_private *cp = to_class(kobj); struct subsys_private *cp = to_subsys_private(kobj);
ssize_t ret = -EIO; ssize_t ret = -EIO;
if (class_attr->store) if (class_attr->store)
@ -49,7 +49,7 @@ static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
static void class_release(struct kobject *kobj) static void class_release(struct kobject *kobj)
{ {
struct class_private *cp = to_class(kobj); struct subsys_private *cp = to_subsys_private(kobj);
struct class *class = cp->class; struct class *class = cp->class;
pr_debug("class '%s': release.\n", class->name); pr_debug("class '%s': release.\n", class->name);
@ -65,7 +65,7 @@ static void class_release(struct kobject *kobj)
static const struct kobj_ns_type_operations *class_child_ns_type(struct kobject *kobj) static const struct kobj_ns_type_operations *class_child_ns_type(struct kobject *kobj)
{ {
struct class_private *cp = to_class(kobj); struct subsys_private *cp = to_subsys_private(kobj);
struct class *class = cp->class; struct class *class = cp->class;
return class->ns_type; return class->ns_type;
@ -82,7 +82,7 @@ static struct kobj_type class_ktype = {
.child_ns_type = class_child_ns_type, .child_ns_type = class_child_ns_type,
}; };
/* Hotplug events for classes go to the class class_subsys */ /* Hotplug events for classes go to the class subsys */
static struct kset *class_kset; static struct kset *class_kset;
@ -90,7 +90,7 @@ int class_create_file(struct class *cls, const struct class_attribute *attr)
{ {
int error; int error;
if (cls) if (cls)
error = sysfs_create_file(&cls->p->class_subsys.kobj, error = sysfs_create_file(&cls->p->subsys.kobj,
&attr->attr); &attr->attr);
else else
error = -EINVAL; error = -EINVAL;
@ -100,20 +100,20 @@ int class_create_file(struct class *cls, const struct class_attribute *attr)
void class_remove_file(struct class *cls, const struct class_attribute *attr) void class_remove_file(struct class *cls, const struct class_attribute *attr)
{ {
if (cls) if (cls)
sysfs_remove_file(&cls->p->class_subsys.kobj, &attr->attr); sysfs_remove_file(&cls->p->subsys.kobj, &attr->attr);
} }
static struct class *class_get(struct class *cls) static struct class *class_get(struct class *cls)
{ {
if (cls) if (cls)
kset_get(&cls->p->class_subsys); kset_get(&cls->p->subsys);
return cls; return cls;
} }
static void class_put(struct class *cls) static void class_put(struct class *cls)
{ {
if (cls) if (cls)
kset_put(&cls->p->class_subsys); kset_put(&cls->p->subsys);
} }
static int add_class_attrs(struct class *cls) static int add_class_attrs(struct class *cls)
@ -162,7 +162,7 @@ static void klist_class_dev_put(struct klist_node *n)
int __class_register(struct class *cls, struct lock_class_key *key) int __class_register(struct class *cls, struct lock_class_key *key)
{ {
struct class_private *cp; struct subsys_private *cp;
int error; int error;
pr_debug("device class '%s': registering\n", cls->name); pr_debug("device class '%s': registering\n", cls->name);
@ -170,11 +170,11 @@ int __class_register(struct class *cls, struct lock_class_key *key)
cp = kzalloc(sizeof(*cp), GFP_KERNEL); cp = kzalloc(sizeof(*cp), GFP_KERNEL);
if (!cp) if (!cp)
return -ENOMEM; return -ENOMEM;
klist_init(&cp->class_devices, klist_class_dev_get, klist_class_dev_put); klist_init(&cp->klist_devices, klist_class_dev_get, klist_class_dev_put);
INIT_LIST_HEAD(&cp->class_interfaces); INIT_LIST_HEAD(&cp->class_interfaces);
kset_init(&cp->class_dirs); kset_init(&cp->glue_dirs);
__mutex_init(&cp->class_mutex, "struct class mutex", key); __mutex_init(&cp->class_mutex, "struct class mutex", key);
error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name); error = kobject_set_name(&cp->subsys.kobj, "%s", cls->name);
if (error) { if (error) {
kfree(cp); kfree(cp);
return error; return error;
@ -187,15 +187,15 @@ int __class_register(struct class *cls, struct lock_class_key *key)
#if defined(CONFIG_BLOCK) #if defined(CONFIG_BLOCK)
/* let the block class directory show up in the root of sysfs */ /* let the block class directory show up in the root of sysfs */
if (!sysfs_deprecated || cls != &block_class) if (!sysfs_deprecated || cls != &block_class)
cp->class_subsys.kobj.kset = class_kset; cp->subsys.kobj.kset = class_kset;
#else #else
cp->class_subsys.kobj.kset = class_kset; cp->subsys.kobj.kset = class_kset;
#endif #endif
cp->class_subsys.kobj.ktype = &class_ktype; cp->subsys.kobj.ktype = &class_ktype;
cp->class = cls; cp->class = cls;
cls->p = cp; cls->p = cp;
error = kset_register(&cp->class_subsys); error = kset_register(&cp->subsys);
if (error) { if (error) {
kfree(cp); kfree(cp);
return error; return error;
@ -210,7 +210,7 @@ void class_unregister(struct class *cls)
{ {
pr_debug("device class '%s': unregistering\n", cls->name); pr_debug("device class '%s': unregistering\n", cls->name);
remove_class_attrs(cls); remove_class_attrs(cls);
kset_unregister(&cls->p->class_subsys); kset_unregister(&cls->p->subsys);
} }
static void class_create_release(struct class *cls) static void class_create_release(struct class *cls)
@ -295,7 +295,7 @@ void class_dev_iter_init(struct class_dev_iter *iter, struct class *class,
if (start) if (start)
start_knode = &start->knode_class; start_knode = &start->knode_class;
klist_iter_init_node(&class->p->class_devices, &iter->ki, start_knode); klist_iter_init_node(&class->p->klist_devices, &iter->ki, start_knode);
iter->type = type; iter->type = type;
} }
EXPORT_SYMBOL_GPL(class_dev_iter_init); EXPORT_SYMBOL_GPL(class_dev_iter_init);

22
drivers/base/core.c
View file

@ -610,7 +610,7 @@ class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
dir->class = class; dir->class = class;
kobject_init(&dir->kobj, &class_dir_ktype); kobject_init(&dir->kobj, &class_dir_ktype);
dir->kobj.kset = &class->p->class_dirs; dir->kobj.kset = &class->p->glue_dirs;
retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name);
if (retval < 0) { if (retval < 0) {
@ -635,7 +635,7 @@ static struct kobject *get_device_parent(struct device *dev,
if (sysfs_deprecated && dev->class == &block_class) { if (sysfs_deprecated && dev->class == &block_class) {
if (parent && parent->class == &block_class) if (parent && parent->class == &block_class)
return &parent->kobj; return &parent->kobj;
return &block_class.p->class_subsys.kobj; return &block_class.p->subsys.kobj;
} }
#endif #endif
@ -654,13 +654,13 @@ static struct kobject *get_device_parent(struct device *dev,
mutex_lock(&gdp_mutex); mutex_lock(&gdp_mutex);
/* find our class-directory at the parent and reference it */ /* find our class-directory at the parent and reference it */
spin_lock(&dev->class->p->class_dirs.list_lock); spin_lock(&dev->class->p->glue_dirs.list_lock);
list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry)
if (k->parent == parent_kobj) { if (k->parent == parent_kobj) {
kobj = kobject_get(k); kobj = kobject_get(k);
break; break;
} }
spin_unlock(&dev->class->p->class_dirs.list_lock); spin_unlock(&dev->class->p->glue_dirs.list_lock);
if (kobj) { if (kobj) {
mutex_unlock(&gdp_mutex); mutex_unlock(&gdp_mutex);
return kobj; return kobj;
@ -682,7 +682,7 @@ static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
{ {
/* see if we live in a "glue" directory */ /* see if we live in a "glue" directory */
if (!glue_dir || !dev->class || if (!glue_dir || !dev->class ||
glue_dir->kset != &dev->class->p->class_dirs) glue_dir->kset != &dev->class->p->glue_dirs)
return; return;
kobject_put(glue_dir); kobject_put(glue_dir);
@ -709,7 +709,7 @@ static int device_add_class_symlinks(struct device *dev)
return 0; return 0;
error = sysfs_create_link(&dev->kobj, error = sysfs_create_link(&dev->kobj,
&dev->class->p->class_subsys.kobj, &dev->class->p->subsys.kobj,
"subsystem"); "subsystem");
if (error) if (error)
goto out; goto out;
@ -728,7 +728,7 @@ static int device_add_class_symlinks(struct device *dev)
#endif #endif
/* link in the class directory pointing to the device */ /* link in the class directory pointing to the device */
error = sysfs_create_link(&dev->class->p->class_subsys.kobj, error = sysfs_create_link(&dev->class->p->subsys.kobj,
&dev->kobj, dev_name(dev)); &dev->kobj, dev_name(dev));
if (error) if (error)
goto out_device; goto out_device;
@ -756,7 +756,7 @@ static void device_remove_class_symlinks(struct device *dev)
if (sysfs_deprecated && dev->class == &block_class) if (sysfs_deprecated && dev->class == &block_class)
return; return;
#endif #endif
sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev_name(dev)); sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev));
} }
/** /**
@ -947,7 +947,7 @@ int device_add(struct device *dev)
mutex_lock(&dev->class->p->class_mutex); mutex_lock(&dev->class->p->class_mutex);
/* tie the class to the device */ /* tie the class to the device */
klist_add_tail(&dev->knode_class, klist_add_tail(&dev->knode_class,
&dev->class->p->class_devices); &dev->class->p->klist_devices);
/* notify any interfaces that the device is here */ /* notify any interfaces that the device is here */
list_for_each_entry(class_intf, list_for_each_entry(class_intf,
@ -1535,7 +1535,7 @@ int device_rename(struct device *dev, const char *new_name)
} }
if (dev->class) { if (dev->class) {
error = sysfs_rename_link(&dev->class->p->class_subsys.kobj, error = sysfs_rename_link(&dev->class->p->subsys.kobj,
&dev->kobj, old_device_name, new_name); &dev->kobj, old_device_name, new_name);
if (error) if (error)
goto out; goto out;

7
include/linux/device.h
View file

@ -30,9 +30,8 @@ struct device_private;
struct device_driver; struct device_driver;
struct driver_private; struct driver_private;
struct class; struct class;
struct class_private; struct subsys_private;
struct bus_type; struct bus_type;
struct bus_type_private;
struct device_node; struct device_node;
struct bus_attribute { struct bus_attribute {
@ -65,7 +64,7 @@ struct bus_type {
const struct dev_pm_ops *pm; const struct dev_pm_ops *pm;
struct bus_type_private *p; struct subsys_private *p;
}; };
extern int __must_check bus_register(struct bus_type *bus); extern int __must_check bus_register(struct bus_type *bus);
@ -213,7 +212,7 @@ struct class {
const struct dev_pm_ops *pm; const struct dev_pm_ops *pm;
struct class_private *p; struct subsys_private *p;
}; };
struct class_dev_iter { struct class_dev_iter {