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path: root/drivers/base/bus.c
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Diffstat (limited to 'drivers/base/bus.c')
-rw-r--r--drivers/base/bus.c42
1 files changed, 37 insertions, 5 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index ab53832d57e5..03204bfd17af 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -156,7 +156,9 @@ static ssize_t driver_unbind(struct device_driver *drv,
device_release_driver(dev);
err = count;
}
- return err;
+ if (err)
+ return err;
+ return count;
}
static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind);
@@ -358,7 +360,7 @@ int bus_add_device(struct device * dev)
if (bus) {
pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
device_attach(dev);
- klist_add_tail(&bus->klist_devices, &dev->knode_bus);
+ klist_add_tail(&dev->knode_bus, &bus->klist_devices);
error = device_add_attrs(bus, dev);
if (!error) {
sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);
@@ -446,7 +448,7 @@ int bus_add_driver(struct device_driver * drv)
}
driver_attach(drv);
- klist_add_tail(&bus->klist_drivers, &drv->knode_bus);
+ klist_add_tail(&drv->knode_bus, &bus->klist_drivers);
module_add_driver(drv->owner, drv);
driver_add_attrs(bus, drv);
@@ -566,6 +568,36 @@ static void bus_remove_attrs(struct bus_type * bus)
}
}
+static void klist_devices_get(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_bus);
+
+ get_device(dev);
+}
+
+static void klist_devices_put(struct klist_node *n)
+{
+ struct device *dev = container_of(n, struct device, knode_bus);
+
+ put_device(dev);
+}
+
+static void klist_drivers_get(struct klist_node *n)
+{
+ struct device_driver *drv = container_of(n, struct device_driver,
+ knode_bus);
+
+ get_driver(drv);
+}
+
+static void klist_drivers_put(struct klist_node *n)
+{
+ struct device_driver *drv = container_of(n, struct device_driver,
+ knode_bus);
+
+ put_driver(drv);
+}
+
/**
* bus_register - register a bus with the system.
* @bus: bus.
@@ -600,8 +632,8 @@ int bus_register(struct bus_type * bus)
if (retval)
goto bus_drivers_fail;
- klist_init(&bus->klist_devices);
- klist_init(&bus->klist_drivers);
+ klist_init(&bus->klist_devices, klist_devices_get, klist_devices_put);
+ klist_init(&bus->klist_drivers, klist_drivers_get, klist_drivers_put);
bus_add_attrs(bus);
pr_debug("bus type '%s' registered\n", bus->name);