From 0cfbd57ebcfc41c03d784771203fc5f6e62a1a44 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Tue, 23 Apr 2013 06:26:54 +0000
Subject: [PATCH] Add descriptive comment.

---
 sys/dev/usb/controller/xhci.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sys/dev/usb/controller/xhci.c b/sys/dev/usb/controller/xhci.c
index 2ab527981ca..e20bcdde3fe 100644
--- a/sys/dev/usb/controller/xhci.c
+++ b/sys/dev/usb/controller/xhci.c
@@ -554,6 +554,12 @@ xhci_init(struct xhci_softc *sc, device_t self)
 void
 xhci_uninit(struct xhci_softc *sc)
 {
+	/*
+	 * NOTE: At this point the control transfer process is gone
+	 * and "xhci_configure_msg" is no longer called. Consequently
+	 * waiting for the configuration messages to complete is not
+	 * needed.
+	 */
 	usb_bus_mem_free_all(&sc->sc_bus, &xhci_iterate_hw_softc);
 
 	cv_destroy(&sc->sc_cmd_cv);