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From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Tue, 8 Mar 2011 08:02:39 +0000 (UTC)
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Subject: svn commit: r219395 - head/sys/dev/usb
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Author: hselasky
Date: Tue Mar  8 08:02:39 2011
New Revision: 219395
URL: http://svn.freebsd.org/changeset/base/219395

Log:
  - Bugfix: Root HUBs do not support re-enumeration.
  
  MFC after:	14 days
  Approved by:	thompsa (mentor)

Modified:
  head/sys/dev/usb/usb_generic.c

Modified: head/sys/dev/usb/usb_generic.c
==============================================================================
--- head/sys/dev/usb/usb_generic.c	Tue Mar  8 07:42:09 2011	(r219394)
+++ head/sys/dev/usb/usb_generic.c	Tue Mar  8 08:02:39 2011	(r219395)
@@ -952,8 +952,14 @@ ugen_re_enumerate(struct usb_fifo *f)
 	}
 	if (udev->flags.usb_mode != USB_MODE_HOST) {
 		/* not possible in device side mode */
+		DPRINTFN(6, "device mode\n");
 		return (ENOTTY);
 	}
+	if (udev->parent_hub == NULL) {
+		/* the root HUB cannot be re-enumerated */
+		DPRINTFN(6, "cannot reset root HUB\n");
+		return (EINVAL);
+	}
 	/* make sure all FIFO's are gone */
 	/* else there can be a deadlock */
 	if (ugen_fs_uninit(f)) {