1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 020b58528d9..f026991d0bd 100644
--- a/drivers/usb/core/usb.c
+++ b/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);