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Commit 11c3b5c3 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

driver core: move klist_children into private structure 



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: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 2831fe6f

drivers/base/base.h

+6 −0
Original line number Diff line number Diff line
@@ -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);

drivers/base/core.c

+24 −13
Original line number Diff line number Diff line
@@ -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));

			}

		}

include/linux/device.h

+0 −2
Original line number Diff line number Diff line
@@ -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;