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[PATCH] Use a klist for device child lists. 

- Use klist iterator in device_for_each_child(), making it safe to use for
  removing devices.
- Remove unused list_to_dev() function.
- Kills all usage of devices_subsys.rwsem.

Signed-off-by: Patrick Mochel <mochel@digitalimplant.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
mochel@digitalimplant.org 2005-03-24 19:08:30 -08:00 committed by Greg Kroah-Hartman
parent 9a881f166f
commit 36239577cf
2 changed files with 17 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/base/core.c
View File

@ -207,8 +207,7 @@ void device_initialize(struct device *dev)
{
kobj_set_kset_s(dev, devices_subsys);
kobject_init(&dev->kobj);
INIT_LIST_HEAD(&dev->node);
INIT_LIST_HEAD(&dev->children);
klist_init(&dev->klist_children);
INIT_LIST_HEAD(&dev->dma_pools);
init_MUTEX(&dev->sem);
}
@ -249,10 +248,8 @@ int device_add(struct device *dev)
goto PMError;
if ((error = bus_add_device(dev)))
goto BusError;
down_write(&devices_subsys.rwsem);
if (parent)
list_add_tail(&dev->node, &parent->children);
up_write(&devices_subsys.rwsem);
klist_add_tail(&parent->klist_children, &dev->knode_parent);
/* notify platform of device entry */
if (platform_notify)
@ -335,10 +332,8 @@ void device_del(struct device * dev)
{
struct device * parent = dev->parent;
down_write(&devices_subsys.rwsem);
if (parent)
list_del_init(&dev->node);
up_write(&devices_subsys.rwsem);
klist_remove(&dev->knode_parent);
/* Notify the platform of the removal, in case they
* need to do anything...
@ -372,6 +367,12 @@ 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;
}
/**
* device_for_each_child - device child iterator.
* @dev: parent struct device.
@ -384,18 +385,17 @@ void device_unregister(struct device * dev)
* We check the return of @fn each time. If it returns anything
* other than 0, we break out and return that value.
*/
int device_for_each_child(struct device * dev, void * data,
int device_for_each_child(struct device * parent, void * data,
int (*fn)(struct device *, void *))
{
struct klist_iter i;
struct device * child;
int error = 0;
down_read(&devices_subsys.rwsem);
list_for_each_entry(child, &dev->children, node) {
if((error = fn(child, data)))
break;
}
up_read(&devices_subsys.rwsem);
klist_iter_init(&parent->klist_children, &i);
while ((child = next_device(&i)) && !error)
error = fn(child, data);
klist_iter_exit(&i);
return error;
}

10
include/linux/device.h
View File

@ -262,8 +262,8 @@ extern void class_device_destroy(struct class *cls, dev_t devt);
struct device {
struct list_head node; /* node in sibling list */
struct list_head children;
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;
@ -298,12 +298,6 @@ struct device {
void (*release)(struct device * dev);
};
static inline struct device *
list_to_dev(struct list_head *node)
{
return list_entry(node, struct device, node);
}
static inline void *
dev_get_drvdata (struct device *dev)
{