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[PATCH] Fix up bus code and remove use of rwsem. 

- Don't add devices to bus's embedded kset, since it's not used by anyone anymore.
- Don't need to take the bus rwsem when calling {device,driver}_attach(), since
  those functions use the klists and the klists' spinlocks.

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 13:02:28 -08:00 committed by Greg Kroah-Hartman
parent d4a7537122
commit 6eded061b1
1 changed files with 0 additions and 12 deletions
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12
drivers/base/bus.c
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@ -17,8 +17,6 @@
#include "base.h" #include "base.h"
#include "power/power.h" #include "power/power.h"
#define to_dev(node) container_of(node, struct device, bus_list)
#define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr) #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
#define to_bus(obj) container_of(obj, struct bus_type, subsys.kset.kobj) #define to_bus(obj) container_of(obj, struct bus_type, subsys.kset.kobj)
@ -271,11 +269,8 @@ int bus_add_device(struct device * dev)
int error = 0; int error = 0;
if (bus) { if (bus) {
down_write(&dev->bus->subsys.rwsem);
pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id); pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
list_add_tail(&dev->bus_list, &dev->bus->devices.list);
device_attach(dev); device_attach(dev);
up_write(&dev->bus->subsys.rwsem);
klist_add_tail(&bus->klist_devices, &dev->knode_bus); klist_add_tail(&bus->klist_devices, &dev->knode_bus);
device_add_attrs(bus, dev); device_add_attrs(bus, dev);
sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id); sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);
@ -300,11 +295,8 @@ void bus_remove_device(struct device * dev)
sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id); sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id);
device_remove_attrs(dev->bus, dev); device_remove_attrs(dev->bus, dev);
klist_remove(&dev->knode_bus); klist_remove(&dev->knode_bus);
down_write(&dev->bus->subsys.rwsem);
pr_debug("bus %s: remove device %s\n", dev->bus->name, dev->bus_id); pr_debug("bus %s: remove device %s\n", dev->bus->name, dev->bus_id);
device_release_driver(dev); device_release_driver(dev);
list_del_init(&dev->bus_list);
up_write(&dev->bus->subsys.rwsem);
put_bus(dev->bus); put_bus(dev->bus);
} }
} }
@ -364,9 +356,7 @@ int bus_add_driver(struct device_driver * drv)
return error; return error;
} }
down_write(&bus->subsys.rwsem);
driver_attach(drv); driver_attach(drv);
up_write(&bus->subsys.rwsem);
klist_add_tail(&bus->klist_drivers, &drv->knode_bus); klist_add_tail(&bus->klist_drivers, &drv->knode_bus);
module_add_driver(drv->owner, drv); module_add_driver(drv->owner, drv);
@ -390,10 +380,8 @@ void bus_remove_driver(struct device_driver * drv)
if (drv->bus) { if (drv->bus) {
driver_remove_attrs(drv->bus, drv); driver_remove_attrs(drv->bus, drv);
klist_remove(&drv->knode_bus); klist_remove(&drv->knode_bus);
down_write(&drv->bus->subsys.rwsem);
pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name); pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);
driver_detach(drv); driver_detach(drv);
up_write(&drv->bus->subsys.rwsem);
module_remove_driver(drv); module_remove_driver(drv);
kobject_unregister(&drv->kobj); kobject_unregister(&drv->kobj);
put_bus(drv->bus); put_bus(drv->bus);