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driver core: create a private portion of struct device

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This is to be used to move things out of struct device that no code
outside of the driver core should ever touch.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2008-12-16 12:23:36 -08:00
parent b23530ebc3
commit fb069a5d13
3 changed files with 24 additions and 0 deletions
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12
drivers/base/base.h
View File

@ -63,6 +63,18 @@ struct class_private {
#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.
*
* @device - pointer back to the struct class that this structure is
* associated with.
*
* Nothing outside of the driver core should ever touch these fields.
*/
struct device_private {
struct device *device;
};
/* initialisation functions */
extern int devices_init(void);
extern int buses_init(void);

9
drivers/base/core.c
View File

@ -109,6 +109,7 @@ static struct sysfs_ops dev_sysfs_ops = {
static void device_release(struct kobject *kobj)
{
struct device *dev = to_dev(kobj);
struct device_private *p = dev->p;
if (dev->release)
dev->release(dev);
@ -120,6 +121,7 @@ static void device_release(struct kobject *kobj)
WARN(1, KERN_ERR "Device '%s' does not have a release() "
"function, it is broken and must be fixed.\n",
dev_name(dev));
kfree(p);
}
static struct kobj_type device_ktype = {
@ -859,6 +861,13 @@ int device_add(struct device *dev)
if (!dev)
goto done;
dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
if (!dev->p) {
error = -ENOMEM;
goto done;
}
dev->p->device = dev;
/*
* for statically allocated devices, which should all be converted
* some day, we need to initialize the name. We prevent reading back

3
include/linux/device.h
View File

@ -28,6 +28,7 @@
#define BUS_ID_SIZE 20
struct device;
struct device_private;
struct device_driver;
struct driver_private;
struct class;
@ -373,6 +374,8 @@ struct device {
struct klist_node knode_bus;
struct device *parent;
struct device_private *p;
struct kobject kobj;
unsigned uevent_suppress:1;
const char *init_name; /* initial name of the device */