Driver core: allow devices in classes to have no parent

This fixes an oops when a device is attached to a class, yet has no
"parent" device.  An example of this would be the "lo" device in the
network core.

We should create a "virtual" subdirectory under /sys/devices/ for these,
but no one seems to agree on a proper name for it yet...

Oh, and update my copyright on the driver core.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 10 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 641c0c42bb48..5c91d0d81e78 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3,6 +3,8 @@
  *
  * Copyright (c) 2002-3 Patrick Mochel
  * Copyright (c) 2002-3 Open Source Development Labs
+ * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (c) 2006 Novell, Inc.
  *
  * This file is released under the GPLv2
  *
@@ -373,10 +375,11 @@ int device_add(struct device *dev)
                                   "subsystem");
                 sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj,
                                   dev->bus_id);
-
-                sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device");
-                class_name = make_class_name(dev->class->name, &dev->kobj);
-                sysfs_create_link(&dev->parent->kobj, &dev->kobj, class_name);
+                if (parent) {
+                        sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device");
+                        class_name = make_class_name(dev->class->name, &dev->kobj);
+                        sysfs_create_link(&dev->parent->kobj, &dev->kobj, class_name);
+                }
         }
 
         if ((error = device_add_groups(dev)))
@@ -495,8 +498,10 @@ void device_del(struct device * dev)
                 sysfs_remove_link(&dev->kobj, "subsystem");
                 sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id);
                 class_name = make_class_name(dev->class->name, &dev->kobj);
-                sysfs_remove_link(&dev->kobj, "device");
-                sysfs_remove_link(&dev->parent->kobj, class_name);
+                if (parent) {
+                        sysfs_remove_link(&dev->kobj, "device");
+                        sysfs_remove_link(&dev->parent->kobj, class_name);
+                }
                 kfree(class_name);
                 down(&dev->class->sem);
                 list_del_init(&dev->node);
@@ -625,10 +630,6 @@ struct device *device_create(struct class *class, struct device *parent,
 
         if (class == NULL || IS_ERR(class))
                 goto error;
-        if (parent == NULL) {
-                printk(KERN_WARNING "%s does not work yet for NULL parents\n", __FUNCTION__);
-                goto error;
-        }
 
         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
         if (!dev) {