From foo@baz Tue Apr 9 12:12:43 2002
To: Greg KH <gregkh@suse.de>
Date: 24 Mar 2005 13:02:28 -08:00
From: mochel@digitalimplant.org
Subject: [driver core] 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>
---
drivers/base/bus.c | 12 ------------
1 files changed, 12 deletions(-)
--- gregkh-2.6.orig/drivers/base/bus.c 2005-05-05 11:08:11.000000000 -0700
+++ gregkh-2.6/drivers/base/bus.c 2005-05-05 11:09:17.000000000 -0700
@@ -17,8 +17,6 @@
#include "base.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(obj) container_of(obj, struct bus_type, subsys.kset.kobj)
@@ -271,11 +269,8 @@
int error = 0;
if (bus) {
- down_write(&dev->bus->subsys.rwsem);
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);
- up_write(&dev->bus->subsys.rwsem);
klist_add_tail(&bus->klist_devices, &dev->knode_bus);
device_add_attrs(bus, dev);
sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);
@@ -300,11 +295,8 @@
sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id);
device_remove_attrs(dev->bus, dev);
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);
device_release_driver(dev);
- list_del_init(&dev->bus_list);
- up_write(&dev->bus->subsys.rwsem);
put_bus(dev->bus);
}
}
@@ -364,9 +356,7 @@
return error;
}
- 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);
@@ -390,10 +380,8 @@
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);
- up_write(&drv->bus->subsys.rwsem);
module_remove_driver(drv);
kobject_unregister(&drv->kobj);
put_bus(drv->bus);