driver core: fix namespace issue with devices assigned to classes

  - uses a kset in "struct class" to keep track of all directories
    belonging to this class
  - merges with the /sys/devices/virtual logic.
  - removes the namespace-dir if the last member of that class
    leaves the directory.

There may be locking or refcounting fixes left, I stopped when it seemed
to work with network and sound modules. :)

From: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/base/class.c b/drivers/base/class.c
index d5968128be2b..80bbb2074636 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -145,6 +145,7 @@ int class_register(struct class * cls)
         INIT_LIST_HEAD(&cls->children);
         INIT_LIST_HEAD(&cls->devices);
         INIT_LIST_HEAD(&cls->interfaces);
+        kset_init(&cls->class_dirs);
         init_MUTEX(&cls->sem);
         error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name);
         if (error)
@@ -163,7 +164,6 @@ int class_register(struct class * cls)
 void class_unregister(struct class * cls)
 {
         pr_debug("device class '%s': unregistering\n", cls->name);
-        kobject_unregister(cls->virtual_dir);
         remove_class_attrs(cls);
         subsystem_unregister(&cls->subsys);
 }