Merge ../linus

[linux-drm-fsl-dcu.git] / drivers / base / bus.c

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 7d8a7ce73fb314a22d8d2ec51c8717b2ab10cc0b..472810f8e6e7332f13127b31a299f5712e4ffbc9 100644 (file)
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -355,6 +355,21 @@ static void device_remove_attrs(struct bus_type * bus, struct device * dev)
        }
 }
 
+#ifdef CONFIG_SYSFS_DEPRECATED
+static int make_deprecated_bus_links(struct device *dev)
+{
+       return sysfs_create_link(&dev->kobj,
+                                &dev->bus->subsys.kset.kobj, "bus");
+}
+
+static void remove_deprecated_bus_links(struct device *dev)
+{
+       sysfs_remove_link(&dev->kobj, "bus");
+}
+#else
+static inline int make_deprecated_bus_links(struct device *dev) { return 0; }
+static inline void remove_deprecated_bus_links(struct device *dev) { }
+#endif
 
 /**
  *     bus_add_device - add device to bus
@@ -381,8 +396,7 @@ int bus_add_device(struct device * dev)
                                &dev->bus->subsys.kset.kobj, "subsystem");
                if (error)
                        goto out_subsys;
-               error = sysfs_create_link(&dev->kobj,
-                               &dev->bus->subsys.kset.kobj, "bus");
+               error = make_deprecated_bus_links(dev);
                if (error)
                        goto out_deprecated;
        }
@@ -436,7 +450,7 @@ void bus_remove_device(struct device * dev)
 {
        if (dev->bus) {
                sysfs_remove_link(&dev->kobj, "subsystem");
-               sysfs_remove_link(&dev->kobj, "bus");
+               remove_deprecated_bus_links(dev);
                sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id);
                device_remove_attrs(dev->bus, dev);
                if (dev->is_registered) {
@@ -724,6 +738,8 @@ int bus_register(struct bus_type * bus)
 {
        int retval;
 
+       BLOCKING_INIT_NOTIFIER_HEAD(&bus->bus_notifier);
+
        retval = kobject_set_name(&bus->subsys.kset.kobj, "%s", bus->name);
        if (retval)
                goto out;
@@ -782,6 +798,18 @@ void bus_unregister(struct bus_type * bus)
        subsystem_unregister(&bus->subsys);
 }
 
+int bus_register_notifier(struct bus_type *bus, struct notifier_block *nb)
+{
+       return blocking_notifier_chain_register(&bus->bus_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(bus_register_notifier);
+
+int bus_unregister_notifier(struct bus_type *bus, struct notifier_block *nb)
+{
+       return blocking_notifier_chain_unregister(&bus->bus_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(bus_unregister_notifier);
+
 int __init buses_init(void)
 {
        return subsystem_register(&bus_subsys);