1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index f026991d0bd..55b8d3a22d2 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -184,11 +184,16 @@ EXPORT_SYMBOL_GPL(usb_find_interface);
 static void usb_release_dev(struct device *dev)
 {
         struct usb_device *udev;
+        struct usb_hcd *hcd;
 
         udev = to_usb_device(dev);
+        hcd = bus_to_hcd(udev->bus);
 
         usb_destroy_configuration(udev);
-        usb_put_hcd(bus_to_hcd(udev->bus));
+        /* Root hubs aren't real devices, so don't free HCD resources */
+        if (hcd->driver->free_dev && udev->parent)
+                hcd->driver->free_dev(hcd, udev);
+        usb_put_hcd(hcd);
         kfree(udev->product);
         kfree(udev->manufacturer);
         kfree(udev->serial);
@@ -348,6 +353,13 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
                 kfree(dev);
                 return NULL;
         }
+        /* Root hubs aren't true devices, so don't allocate HCD resources */
+        if (usb_hcd->driver->alloc_dev && parent &&
+                !usb_hcd->driver->alloc_dev(usb_hcd, dev)) {
+                usb_put_hcd(bus_to_hcd(bus));
+                kfree(dev);
+                return NULL;
+        }
 
         device_initialize(&dev->dev);
         dev->dev.bus = &usb_bus_type;