Driver core: create devices/virtual/ tree
This change creates a devices/virtual/CLASS_NAME tree for struct devices
that belong to a class, yet do not have a "real" struct device for a
parent. It automatically creates the directories on the fly as needed.
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/class.c b/drivers/base/class.c
index e078bc2..cbdf47c 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -19,6 +19,8 @@
#include <linux/slab.h>
#include "base.h"
+extern struct subsystem devices_subsys;
+
#define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
#define to_class(obj) container_of(obj, struct class, subsys.kset.kobj)
@@ -878,7 +880,22 @@
class_put(parent);
}
+int virtual_device_parent(struct device *dev)
+{
+ if (!dev->class)
+ return -ENODEV;
+ if (!dev->class->virtual_dir) {
+ static struct kobject *virtual_dir = NULL;
+
+ if (!virtual_dir)
+ virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual");
+ dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name);
+ }
+
+ dev->kobj.parent = dev->class->virtual_dir;
+ return 0;
+}
int __init classes_init(void)
{
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 0db4756..e21a65f 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -378,6 +378,13 @@
if (!dev || !strlen(dev->bus_id))
goto Error;
+ /* if this is a class device, and has no parent, create one */
+ if ((dev->class) && (dev->parent == NULL)) {
+ error = virtual_device_parent(dev);
+ if (error)
+ goto Error;
+ }
+
parent = get_device(dev->parent);
pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);