kern/51126: USB device problem after nick-nhusb merge

[mlh%goathill.org@localhost]

>Number:         51126
>Category:       kern
>Synopsis:       USB device problem after nick-nhusb merge
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 09 08:40:00 +0000 2016
>Originator:     Nick Hudson
>Release:        NetBSD 7.99.28
>Organization:
	none
>Environment:
System:	NetBSD 7.99.28 (GENERIC) #1: Tue Apr 26 09:10:57 EDT 2016
Architecture: x86_64
Machine: amd64
>Description:

(From http://mail-index.netbsd.org/port-amd64/2016/04/25/msg002411.html)

On NetBSD 7.99.28 (GENERIC) #0: Mon Apr 25 16:51:54 EDT 2016:  with
the recent nick-nhusb changes, it's nice that unplugging a momory
stick no longer causes a panic and things can now be unmounted
after removal and even remounted on replacment seemingly fine.

However, other than usb drives and memory sticks, none of my other
usb devices work anymore - usb serial ports, Garmins, phones, etc.
When plugging/unplugging those:

uhub3: device problem, disabling port 2
usb_disconnect_port: no device
...
uhub4: device problem, disabling port 3
usb_disconnect_port: no device
...
uhub4: device problem, disabling port 3
usb_disconnect_port: no device
...
uhub3: device problem, disabling port 1
usb_disconnect_port: no device

>How-To-Repeat:
	See above
>Fix:
	Unknown