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authorCornelia Huck <cornelia.huck@de.ibm.com>2006-11-20 19:07:51 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2006-12-02 01:52:01 +0300
commit8a82472f86bf693b8e91ed56c9ca4f62fbbdcfa3 (patch)
tree79d148ee548f4b57e6f5a4a69cf6cdb81e7a1bf2 /lib/kobject.c
parentaf9e0765362151b27372c14d9d6dc417184182d3 (diff)
downloadlinux-8a82472f86bf693b8e91ed56c9ca4f62fbbdcfa3.tar.xz
driver core: Introduce device_move(): move a device to a new parent.
Provide a function device_move() to move a device to a new parent device. Add auxilliary functions kobject_move() and sysfs_move_dir(). kobject_move() generates a new uevent of type KOBJ_MOVE, containing the previous path (DEVPATH_OLD) in addition to the usual values. For this, a new interface kobject_uevent_env() is created that allows to add further environmental data to the uevent at the kobject layer. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'lib/kobject.c')
-rw-r--r--lib/kobject.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/lib/kobject.c b/lib/kobject.c
index 7dd5c0e9d996..744a4b102c7f 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -311,6 +311,56 @@ int kobject_rename(struct kobject * kobj, const char *new_name)
}
/**
+ * kobject_move - move object to another parent
+ * @kobj: object in question.
+ * @new_parent: object's new parent
+ */
+
+int kobject_move(struct kobject *kobj, struct kobject *new_parent)
+{
+ int error;
+ struct kobject *old_parent;
+ const char *devpath = NULL;
+ char *devpath_string = NULL;
+ char *envp[2];
+
+ kobj = kobject_get(kobj);
+ if (!kobj)
+ return -EINVAL;
+ new_parent = kobject_get(new_parent);
+ if (!new_parent) {
+ error = -EINVAL;
+ goto out;
+ }
+ /* old object path */
+ devpath = kobject_get_path(kobj, GFP_KERNEL);
+ if (!devpath) {
+ error = -ENOMEM;
+ goto out;
+ }
+ devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
+ if (!devpath_string) {
+ error = -ENOMEM;
+ goto out;
+ }
+ sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
+ envp[0] = devpath_string;
+ envp[1] = NULL;
+ error = sysfs_move_dir(kobj, new_parent);
+ if (error)
+ goto out;
+ old_parent = kobj->parent;
+ kobj->parent = new_parent;
+ kobject_put(old_parent);
+ kobject_uevent_env(kobj, KOBJ_MOVE, envp);
+out:
+ kobject_put(kobj);
+ kfree(devpath_string);
+ kfree(devpath);
+ return error;
+}
+
+/**
* kobject_del - unlink kobject from hierarchy.
* @kobj: object.
*/