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>

1 files changed, 24 insertions, 4 deletions

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 7f20e7b857cb..a1922765ff31 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -50,18 +50,22 @@ static char *action_to_string(enum kobject_action action)
                 return "offline";
         case KOBJ_ONLINE:
                 return "online";
+        case KOBJ_MOVE:
+                return "move";
         default:
                 return NULL;
         }
 }
 
 /**
- * kobject_uevent - notify userspace by ending an uevent
+ * kobject_uevent_env - send an uevent with environmental data
  *
- * @action: action that is happening (usually KOBJ_ADD and KOBJ_REMOVE)
+ * @action: action that is happening (usually KOBJ_MOVE)
  * @kobj: struct kobject that the action is happening to
+ * @envp_ext: pointer to environmental data
  */
-void kobject_uevent(struct kobject *kobj, enum kobject_action action)
+void kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
+                        char *envp_ext[])
 {
         char **envp;
         char *buffer;
@@ -76,6 +80,7 @@ void kobject_uevent(struct kobject *kobj, enum kobject_action action)
         char *seq_buff;
         int i = 0;
         int retval;
+        int j;
 
         pr_debug("%s\n", __FUNCTION__);
 
@@ -134,7 +139,8 @@ void kobject_uevent(struct kobject *kobj, enum kobject_action action)
         scratch += sprintf (scratch, "DEVPATH=%s", devpath) + 1;
         envp [i++] = scratch;
         scratch += sprintf(scratch, "SUBSYSTEM=%s", subsystem) + 1;
-
+        for (j = 0; envp_ext && envp_ext[j]; j++)
+                envp[i++] = envp_ext[j];
         /* just reserve the space, overwrite it after kset call has returned */
         envp[i++] = seq_buff = scratch;
         scratch += strlen("SEQNUM=18446744073709551616") + 1;
@@ -200,6 +206,20 @@ exit:
         kfree(envp);
         return;
 }
+
+EXPORT_SYMBOL_GPL(kobject_uevent_env);
+
+/**
+ * kobject_uevent - notify userspace by ending an uevent
+ *
+ * @action: action that is happening (usually KOBJ_ADD and KOBJ_REMOVE)
+ * @kobj: struct kobject that the action is happening to
+ */
+void kobject_uevent(struct kobject *kobj, enum kobject_action action)
+{
+        kobject_uevent_env(kobj, action, NULL);
+}
+
 EXPORT_SYMBOL_GPL(kobject_uevent);
 
 /**