kern/138292: "zyd0: device timeout" with ZyXEL G-202

>Number:         138292
>Category:       kern
>Synopsis:       "zyd0: device timeout" with ZyXEL G-202
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Aug 28 23:10:05 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Samuel Boivie
>Release:        8.0-BETA3 amd64, freshly installed
>Organization:
>Environment:
FreeBSD willamette.boivie.org 8.0-BETA3 FreeBSD 8.0-BETA3 #0: Sat Aug 22 02:00:45 UTC 2009     [e-mail]:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
The problem appeared after Weongyo Jeong made the device, ZyXEL G-202, work in May. The device works fine for a while after being configured and then suddenly stops with "kernel: zyd0: device timeout" in /var/less/messages. A soft reboot appears not to help, the device will still not work after reboot. Cutting power will make it work again.

from dmesg:
zyd0: <ZyDAS ZyXEL G-202, rev 2.00/48.10, addr 2> on usbus4

>How-To-Repeat:
Just using the device for a while, eventually it will fail. A csup of ports appears to trigger the timeout quickly and reliably (haven't failed to reproduce timeout yet with 5+ tries).
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:
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