usb: move struct usb_device->children to struct usb_hub_port->child

Move child's pointer to the struct usb_hub_port since the child device
is directly associated with the port. Provide usb_get_hub_child_device()
to get child's pointer.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 5483cd70390b..69163a0abe91 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -424,7 +424,6 @@ enum usb_device_removable {
  *      access from userspace
  * @usbfs_dentry: usbfs dentry entry for the device
  * @maxchild: number of ports if hub
- * @children: child devices - USB devices that are attached to this hub
  * @quirks: quirks of the whole device
  * @urbnum: number of URBs submitted for the whole device
  * @active_duration: total time device is not suspended
@@ -491,7 +490,6 @@ struct usb_device {
         struct list_head filelist;
 
         int maxchild;
-        struct usb_device **children;
 
         u32 quirks;
         atomic_t urbnum;
@@ -517,6 +515,8 @@ static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf)
 
 extern struct usb_device *usb_get_dev(struct usb_device *dev);
 extern void usb_put_dev(struct usb_device *dev);
+extern struct usb_device *usb_get_hub_child_device(struct usb_device *hdev,
+        int port1);
 
 /* USB device locking */
 #define usb_lock_device(udev)           device_lock(&(udev)->dev)