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From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Wed, 9 Apr 2014 06:27:04 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r264294 - head/sys/dev/usb/controller
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Author: hselasky
Date: Wed Apr  9 06:27:04 2014
New Revision: 264294
URL: http://svnweb.freebsd.org/changeset/base/264294

Log:
  Fix for infinite XHCI reset loops when the set address USB request fails.
  
  MFC after:	2 days

Modified:
  head/sys/dev/usb/controller/xhci.c

Modified: head/sys/dev/usb/controller/xhci.c
==============================================================================
--- head/sys/dev/usb/controller/xhci.c	Wed Apr  9 05:15:40 2014	(r264293)
+++ head/sys/dev/usb/controller/xhci.c	Wed Apr  9 06:27:04 2014	(r264294)
@@ -1218,8 +1218,20 @@ retry:
 		 */
 		if (timeout == 0 &&
 		    xhci_reset_command_queue_locked(sc) == 0) {
-			timeout = 1;
-			goto retry;
+			temp = le32toh(trb->dwTrb3);
+
+			/*
+			 * Avoid infinite XHCI reset loops if the set
+			 * address command fails to respond due to a
+			 * non-enumerating device:
+			 */
+			if (XHCI_TRB_3_TYPE_GET(temp) == XHCI_TRB_TYPE_ADDRESS_DEVICE &&
+			    (temp & XHCI_TRB_3_BSR_BIT) == 0) {
+				DPRINTF("Set address timeout\n");
+			} else {
+				timeout = 1;
+				goto retry;
+			}
 		} else {
 			DPRINTF("Controller reset!\n");
 			usb_bus_reset_async_locked(&sc->sc_bus);