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OpenCloudOS-Kernel
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[PATCH] Add a klist to struct bus_type for its drivers. 

- Use it in bus_for_each_drv().
- Use the klist spinlock instead of the bus 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 2005-03-21 12:00:18 -08:00 committed by Greg Kroah-Hartman
parent 465c7a3a3a
commit 38fdac3cdc
2 changed files with 25 additions and 29 deletions
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52
drivers/base/bus.c
View File

@ -135,30 +135,6 @@ static struct kobj_type ktype_bus = {
decl_subsys(bus, &ktype_bus, NULL);
static int __bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
void * data, int (*fn)(struct device_driver *, void *))
{
struct list_head *head;
struct device_driver *drv;
int error = 0;
if (!(bus = get_bus(bus)))
return -EINVAL;
head = &bus->drivers.list;
drv = list_prepare_entry(start, head, kobj.entry);
list_for_each_entry_continue(drv, head, kobj.entry) {
get_driver(drv);
error = fn(drv, data);
put_driver(drv);
if (error)
break;
}
put_bus(bus);
return error;
}
static struct device * next_device(struct klist_iter * i)
{
struct klist_node * n = klist_next(i);
@ -203,6 +179,14 @@ int bus_for_each_dev(struct bus_type * bus, struct device * start,
return error;
}
static struct device_driver * next_driver(struct klist_iter * i)
{
struct klist_node * n = klist_next(i);
return n ? container_of(n, struct device_driver, knode_bus) : NULL;
}
/**
* bus_for_each_drv - driver iterator
* @bus: bus we're dealing with.
@ -226,12 +210,19 @@ int bus_for_each_dev(struct bus_type * bus, struct device * start,
int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
void * data, int (*fn)(struct device_driver *, void *))
{
int ret;
struct klist_iter i;
struct device_driver * drv;
int error = 0;
down_read(&bus->subsys.rwsem);
ret = __bus_for_each_drv(bus, start, data, fn);
up_read(&bus->subsys.rwsem);
return ret;
if (!bus)
return -EINVAL;
klist_iter_init_node(&bus->klist_drivers, &i,
start ? &start->knode_bus : NULL);
while ((drv = next_driver(&i)) && !error)
error = fn(drv, data);
klist_iter_exit(&i);
return error;
}
static int device_add_attrs(struct bus_type * bus, struct device * dev)
@ -376,6 +367,7 @@ int bus_add_driver(struct device_driver * drv)
down_write(&bus->subsys.rwsem);
driver_attach(drv);
up_write(&bus->subsys.rwsem);
klist_add_tail(&bus->klist_drivers, &drv->knode_bus);
module_add_driver(drv->owner, drv);
driver_add_attrs(bus, drv);
@ -397,6 +389,7 @@ void bus_remove_driver(struct device_driver * drv)
{
if (drv->bus) {
driver_remove_attrs(drv->bus, drv);
klist_remove(&drv->knode_bus);
down_write(&drv->bus->subsys.rwsem);
pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);
driver_detach(drv);
@ -536,6 +529,7 @@ int bus_register(struct bus_type * bus)
goto bus_drivers_fail;
klist_init(&bus->klist_devices);
klist_init(&bus->klist_drivers);
bus_add_attrs(bus);
pr_debug("bus type '%s' registered\n", bus->name);

2
include/linux/device.h
View File

@ -53,6 +53,7 @@ struct bus_type {
struct kset drivers;
struct kset devices;
struct klist klist_devices;
struct klist klist_drivers;
struct bus_attribute * bus_attrs;
struct device_attribute * dev_attrs;
@ -105,6 +106,7 @@ struct device_driver {
struct completion unloaded;
struct kobject kobj;
struct list_head devices;
struct klist_node knode_bus;
struct module * owner;