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driver core: move klist_children into private structure

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Nothing outside of the driver core should ever touch klist_children, or
knode_parent, so move them out of the public eye.

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 12:24:56 -08:00
parent 2831fe6f9c
commit 11c3b5c3e0
3 changed files with 30 additions and 15 deletions
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6
drivers/base/base.h
View file

@ -66,14 +66,20 @@ struct class_private {
/**
* struct device_private - structure to hold the private to the driver core portions of the device structure.
*
* @klist_children - klist containing all children of this device
* @knode_parent - node in sibling list
* @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 klist klist_children;
struct klist_node knode_parent;
struct device *device;
};
#define to_device_private_parent(obj) \
container_of(obj, struct device_private, knode_parent)
/* initialisation functions */
extern int devices_init(void);

37
drivers/base/core.c
View file

@ -509,14 +509,16 @@ EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
static void klist_children_get(struct klist_node *n)
{
struct device *dev = container_of(n, struct device, knode_parent);
struct device_private *p = to_device_private_parent(n);
struct device *dev = p->device;
get_device(dev);
}
static void klist_children_put(struct klist_node *n)
{
struct device *dev = container_of(n, struct device, knode_parent);
struct device_private *p = to_device_private_parent(n);
struct device *dev = p->device;
put_device(dev);
}
@ -546,7 +548,7 @@ void device_initialize(struct device *dev)
dev->p->device = dev;
dev->kobj.kset = devices_kset;
kobject_init(&dev->kobj, &device_ktype);
klist_init(&dev->klist_children, klist_children_get,
klist_init(&dev->p->klist_children, klist_children_get,
klist_children_put);
INIT_LIST_HEAD(&dev->dma_pools);
init_MUTEX(&dev->sem);
@ -927,7 +929,8 @@ int device_add(struct device *dev)
kobject_uevent(&dev->kobj, KOBJ_ADD);
bus_attach_device(dev);
if (parent)
klist_add_tail(&dev->knode_parent, &parent->klist_children);
klist_add_tail(&dev->p->knode_parent,
&parent->p->klist_children);
if (dev->class) {
mutex_lock(&dev->class->p->class_mutex);
@ -1038,7 +1041,7 @@ void device_del(struct device *dev)
device_pm_remove(dev);
dpm_sysfs_remove(dev);
if (parent)
klist_del(&dev->knode_parent);
klist_del(&dev->p->knode_parent);
if (MAJOR(dev->devt)) {
device_remove_sys_dev_entry(dev);
device_remove_file(dev, &devt_attr);
@ -1102,7 +1105,14 @@ void device_unregister(struct device *dev)
static struct device *next_device(struct klist_iter *i)
{
struct klist_node *n = klist_next(i);
return n ? container_of(n, struct device, knode_parent) : NULL;
struct device *dev = NULL;
struct device_private *p;
if (n) {
p = to_device_private_parent(n);
dev = p->device;
}
return dev;
}
/**
@ -1124,7 +1134,7 @@ int device_for_each_child(struct device *parent, void *data,
struct device *child;
int error = 0;
klist_iter_init(&parent->klist_children, &i);
klist_iter_init(&parent->p->klist_children, &i);
while ((child = next_device(&i)) && !error)
error = fn(child, data);
klist_iter_exit(&i);
@ -1155,7 +1165,7 @@ struct device *device_find_child(struct device *parent, void *data,
if (!parent)
return NULL;
klist_iter_init(&parent->klist_children, &i);
klist_iter_init(&parent->p->klist_children, &i);
while ((child = next_device(&i)))
if (match(child, data) && get_device(child))
break;
@ -1478,9 +1488,10 @@ int device_move(struct device *dev, struct device *new_parent)
old_parent = dev->parent;
dev->parent = new_parent;
if (old_parent)
klist_remove(&dev->knode_parent);
klist_remove(&dev->p->knode_parent);
if (new_parent) {
klist_add_tail(&dev->knode_parent, &new_parent->klist_children);
klist_add_tail(&dev->p->knode_parent,
&new_parent->p->klist_children);
set_dev_node(dev, dev_to_node(new_parent));
}
@ -1492,11 +1503,11 @@ int device_move(struct device *dev, struct device *new_parent)
device_move_class_links(dev, new_parent, old_parent);
if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
if (new_parent)
klist_remove(&dev->knode_parent);
klist_remove(&dev->p->knode_parent);
dev->parent = old_parent;
if (old_parent) {
klist_add_tail(&dev->knode_parent,
&old_parent->klist_children);
klist_add_tail(&dev->p->knode_parent,
&old_parent->p->klist_children);
set_dev_node(dev, dev_to_node(old_parent));
}
}

2
include/linux/device.h
View file

@ -366,8 +366,6 @@ struct device_dma_parameters {
};
struct device {
struct klist klist_children;
struct klist_node knode_parent; /* node in sibling list */
struct klist_node knode_driver;
struct klist_node knode_bus;
struct device *parent;