Index: usb-devel/drivers/hid/hid-core.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-core.c
+++ usb-devel/drivers/hid/hid-core.c
@@ -1973,6 +1973,8 @@ int hid_hw_start(struct hid_device *hdev
 {
 	int error;
 
+	dev_info(&hdev->dev, "In hid_hw_start for %p\n", hdev);
+	dump_stack();
 	error = hdev->ll_driver->start(hdev);
 	if (error)
 		return error;
@@ -1998,6 +2000,7 @@ EXPORT_SYMBOL_GPL(hid_hw_start);
  */
 void hid_hw_stop(struct hid_device *hdev)
 {
+	dev_info(&hdev->dev, "In hid_hw_stop for %p\n", hdev);
 	hid_disconnect(hdev);
 	hdev->ll_driver->stop(hdev);
 }