[PATCH 2/4] driver-core: merge private parts of class and bus
From: Greg Kroah-Hartman
Date: Mon Jan 10 2011 - 19:23:37 EST
From: Kay Sievers <kay.sievers@xxxxxxxx>
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@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/base/base.h | 62 +++++++++++++++++++----------------------------
drivers/base/bus.c | 13 ++++-----
drivers/base/class.c | 38 ++++++++++++++--------------
drivers/base/core.c | 22 ++++++++--------
include/linux/device.h | 7 ++---
5 files changed, 64 insertions(+), 78 deletions(-)
diff --git a/drivers/base/base.h b/drivers/base/base.h
index 2ca7f5b..19f49e4 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -1,31 +1,46 @@
/**
- * 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
- * @drivers_kset - the list of drivers associated with this bus
- * @devices_kset - the list of devices associated with this bus
+ * @subsys - the struct kset that defines this subsystem
+ * @devices_kset - the list of devices associated
+ *
+ * @drivers_kset - the list of drivers associated
* @klist_devices - the klist to iterate over the @devices_kset
* @klist_drivers - the klist to iterate over the @drivers_kset
* @bus_notifier - the bus notifier list for anything that cares about things
- * on this bus.
+ * on this bus.
* @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
- * bus_type to be statically allocated safely. Nothing outside of the driver
- * core should ever touch these fields.
+ * bus_type/class to be statically allocated safely. Nothing outside of the
+ * driver core should ever touch these fields.
*/
-struct bus_type_private {
+struct subsys_private {
struct kset subsys;
- struct kset *drivers_kset;
struct kset *devices_kset;
+
+ struct kset *drivers_kset;
struct klist klist_devices;
struct klist klist_drivers;
struct blocking_notifier_head bus_notifier;
unsigned int drivers_autoprobe:1;
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 kobject kobj;
@@ -36,33 +51,6 @@ struct driver_private {
};
#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.
*
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 33c270a..e243bd4 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -20,7 +20,6 @@
#include "power/power.h"
#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
@@ -96,11 +95,11 @@ static ssize_t bus_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
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;
if (bus_attr->show)
- ret = bus_attr->show(bus_priv->bus, buf);
+ ret = bus_attr->show(subsys_priv->bus, buf);
return ret;
}
@@ -108,11 +107,11 @@ static ssize_t bus_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count)
{
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;
if (bus_attr->store)
- ret = bus_attr->store(bus_priv->bus, buf, count);
+ ret = bus_attr->store(subsys_priv->bus, buf, count);
return ret;
}
@@ -858,9 +857,9 @@ static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
int bus_register(struct bus_type *bus)
{
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)
return -ENOMEM;
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 7975a52..4f1df2e 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -27,7 +27,7 @@ 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_private *cp = to_class(kobj);
+ struct subsys_private *cp = to_subsys_private(kobj);
ssize_t ret = -EIO;
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)
{
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;
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)
{
- struct class_private *cp = to_class(kobj);
+ struct subsys_private *cp = to_subsys_private(kobj);
struct class *class = cp->class;
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)
{
- struct class_private *cp = to_class(kobj);
+ struct subsys_private *cp = to_subsys_private(kobj);
struct class *class = cp->class;
return class->ns_type;
@@ -82,7 +82,7 @@ static struct kobj_type class_ktype = {
.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;
@@ -90,7 +90,7 @@ int class_create_file(struct class *cls, const struct class_attribute *attr)
{
int error;
if (cls)
- error = sysfs_create_file(&cls->p->class_subsys.kobj,
+ error = sysfs_create_file(&cls->p->subsys.kobj,
&attr->attr);
else
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)
{
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)
{
if (cls)
- kset_get(&cls->p->class_subsys);
+ kset_get(&cls->p->subsys);
return cls;
}
static void class_put(struct class *cls)
{
if (cls)
- kset_put(&cls->p->class_subsys);
+ kset_put(&cls->p->subsys);
}
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)
{
- struct class_private *cp;
+ struct subsys_private *cp;
int error;
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);
if (!cp)
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);
- kset_init(&cp->class_dirs);
+ kset_init(&cp->glue_dirs);
__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) {
kfree(cp);
return error;
@@ -187,15 +187,15 @@ int __class_register(struct class *cls, struct lock_class_key *key)
#if defined(CONFIG_BLOCK)
/* let the block class directory show up in the root of sysfs */
if (!sysfs_deprecated || cls != &block_class)
- cp->class_subsys.kobj.kset = class_kset;
+ cp->subsys.kobj.kset = class_kset;
#else
- cp->class_subsys.kobj.kset = class_kset;
+ cp->subsys.kobj.kset = class_kset;
#endif
- cp->class_subsys.kobj.ktype = &class_ktype;
+ cp->subsys.kobj.ktype = &class_ktype;
cp->class = cls;
cls->p = cp;
- error = kset_register(&cp->class_subsys);
+ error = kset_register(&cp->subsys);
if (error) {
kfree(cp);
return error;
@@ -210,7 +210,7 @@ void class_unregister(struct class *cls)
{
pr_debug("device class '%s': unregistering\n", cls->name);
remove_class_attrs(cls);
- kset_unregister(&cls->p->class_subsys);
+ kset_unregister(&cls->p->subsys);
}
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)
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;
}
EXPORT_SYMBOL_GPL(class_dev_iter_init);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 6ed6454..46ff6c2 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -610,7 +610,7 @@ class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
dir->class = class;
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);
if (retval < 0) {
@@ -635,7 +635,7 @@ static struct kobject *get_device_parent(struct device *dev,
if (sysfs_deprecated && dev->class == &block_class) {
if (parent && parent->class == &block_class)
return &parent->kobj;
- return &block_class.p->class_subsys.kobj;
+ return &block_class.p->subsys.kobj;
}
#endif
@@ -654,13 +654,13 @@ static struct kobject *get_device_parent(struct device *dev,
mutex_lock(&gdp_mutex);
/* find our class-directory at the parent and reference it */
- spin_lock(&dev->class->p->class_dirs.list_lock);
- list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
+ spin_lock(&dev->class->p->glue_dirs.list_lock);
+ list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry)
if (k->parent == parent_kobj) {
kobj = kobject_get(k);
break;
}
- spin_unlock(&dev->class->p->class_dirs.list_lock);
+ spin_unlock(&dev->class->p->glue_dirs.list_lock);
if (kobj) {
mutex_unlock(&gdp_mutex);
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 */
if (!glue_dir || !dev->class ||
- glue_dir->kset != &dev->class->p->class_dirs)
+ glue_dir->kset != &dev->class->p->glue_dirs)
return;
kobject_put(glue_dir);
@@ -709,7 +709,7 @@ static int device_add_class_symlinks(struct device *dev)
return 0;
error = sysfs_create_link(&dev->kobj,
- &dev->class->p->class_subsys.kobj,
+ &dev->class->p->subsys.kobj,
"subsystem");
if (error)
goto out;
@@ -728,7 +728,7 @@ static int device_add_class_symlinks(struct device *dev)
#endif
/* 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));
if (error)
goto out_device;
@@ -756,7 +756,7 @@ static void device_remove_class_symlinks(struct device *dev)
if (sysfs_deprecated && dev->class == &block_class)
return;
#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);
/* tie the class to the device */
klist_add_tail(&dev->knode_class,
- &dev->class->p->class_devices);
+ &dev->class->p->klist_devices);
/* notify any interfaces that the device is here */
list_for_each_entry(class_intf,
@@ -1535,7 +1535,7 @@ int device_rename(struct device *dev, const char *new_name)
}
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);
if (error)
goto out;
diff --git a/include/linux/device.h b/include/linux/device.h
index dd48953..1e2d335 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -30,9 +30,8 @@ struct device_private;
struct device_driver;
struct driver_private;
struct class;
-struct class_private;
+struct subsys_private;
struct bus_type;
-struct bus_type_private;
struct device_node;
struct bus_attribute {
@@ -65,7 +64,7 @@ struct bus_type {
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);
@@ -213,7 +212,7 @@ struct class {
const struct dev_pm_ops *pm;
- struct class_private *p;
+ struct subsys_private *p;
};
struct class_dev_iter {
--
1.7.3.2
--
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