---

yaml
---
r: 151408
b: refs/heads/master
c: 7206b00
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e7b7717247f61e2cf18ec47f91999065c59d1607
+refs/heads/master: 7206b00164a1c3ca533e01db285955617e1019f8

trunk/drivers/usb/core/usb.c

@@ -375,18 +375,24 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
 	 */
 	if (unlikely(!parent)) {
 		dev->devpath[0] = '0';
+		dev->route = 0;
 
 		dev->dev.parent = bus->controller;
 		dev_set_name(&dev->dev, "usb%d", bus->busnum);
 		root_hub = 1;
 	} else {
 		/* match any labeling on the hubs; it's one-based */
-		if (parent->devpath[0] == '0')
+		if (parent->devpath[0] == '0') {
 			snprintf(dev->devpath, sizeof dev->devpath,
 				"%d", port1);
-		else
+			/* Root ports are not counted in route string */
+			dev->route = 0;
+		} else {
 			snprintf(dev->devpath, sizeof dev->devpath,
 				"%s.%d", parent->devpath, port1);
+			dev->route = parent->route +
+				(port1 << ((parent->level - 1)*4));
+		}
 
 		dev->dev.parent = &parent->dev;
 		dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath);

trunk/include/linux/usb.h

@@ -362,6 +362,7 @@ struct usb_tt;
  * struct usb_device - kernel's representation of a USB device
  * @devnum: device number; address on a USB bus
  * @devpath: device ID string for use in messages (e.g., /port/...)
+ * @route: tree topology hex string for use with xHCI
  * @state: device state: configured, not attached, etc.
  * @speed: device speed: high/full/low (or error)
  * @tt: Transaction Translator info; used with low/full speed dev, highspeed hub
@@ -427,6 +428,7 @@ struct usb_tt;
 struct usb_device {
 	int		devnum;
 	char		devpath [16];
+	u32		route;
 	enum usb_device_state	state;
 	enum usb_device_speed	speed;