usb/144199: uvisor(4) - AlphaSmart Dana incorrect stall clearing

[Stephen Hurd]

>Number:         144199
>Category:       usb
>Synopsis:       uvisor(4) - AlphaSmart Dana incorrect stall clearing
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-usb
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Feb 22 07:30:01 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Stephen Hurd
>Release:        8-STABLE
>Organization:
>Environment:
FreeBSD ace.hurd.local 8.0-STABLE FreeBSD 8.0-STABLE #0: Tue Feb 16 01:20:04 PST 2010     root at ace.hurd.local:/tmp/obj/usr/src/sys/ACE  i386

>Description:
With the AlphaSmart Dana (VID=0x081e, PID=0xdf00) the uvisor driver does not function (no I/O) unless the two stall clears after the "clear stall at first run" comment are removed.
>How-To-Repeat:
1) Connect an AlphaSmart Dana via USB
2) Select HotSync on the Dana
3) After uvisor attaches, run ``pilot-xfer -p /dev/cuaU0 -l''
4) pilot-xfer will hang, Dana will timeout, and the device will detach
>Fix:
Remove or make conditional the initial stall clears.  It's not obvious to me why this code is there, so I don't know which is more appropriate.

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