[PATCH 45/61] driver core: move klist_children into private structure

Greg Kroah-Hartman
2009-03-25T00:46:34Z

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>
---
drivers/base/base.h | 6 ++++++
drivers/base/core.c | 39 +++++++++++++++++++++++++--------------
include/linux/device.h | 2 --
3 files changed, 31 insertions(+), 16 deletions(-)

diff --git a/drivers/base/base.h b/drivers/base/base.h
index 62a2cb5..7c4fafc 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -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);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 16d8599..a90f56f 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -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);
}
@@ -540,8 +542,6 @@ void device_initialize(struct device *dev)
{
dev->kobj.kset = devices_kset;
kobject_init(&dev->kobj, &device_ktype);
- klist_init(&dev->klist_children, klist_children_get,
- klist_children_put);
INIT_LIST_HEAD(&dev->dma_pools);
init_MUTEX(&dev->sem);
spin_lock_init(&dev->devres_lock);
@@ -867,6 +867,8 @@ int device_add(struct device *dev)
goto done;
}
dev->p->device = dev;
+ klist_init(&dev->p->klist_children, klist_children_get,
+ klist_children_put);

/*
* for statically allocated devices, which should all be converted
@@ -937,7 +939,8 @@ 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);
@@ -1051,7 +1054,7 @@ 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);
@@ -1112,7 +1115,14 @@ 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;
}

/**
@@ -1134,7 +1144,7 @@ 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);
@@ -1165,7 +1175,7 @@ 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;
@@ -1578,9 +1588,10 @@ 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));
}

@@ -1592,11 +1603,11 @@ 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));
}
}
diff --git a/include/linux/device.h b/include/linux/device.h
index 4cf063f..808d808 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -368,8 +368,6 @@ 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;
--
1.6.2