ugen lockups with apcupsd

[Adam Kropelin]

Mike Tancsa wrote:
> Hi,
>          I have been trying out the apcupsd program with an APC
> RS-1500 on FreeBSD via the ugen interface.  On my VIA box, the machine 
> locks up
> solid within a short period of time after starting the daemon.

This is a known bug and is fixed by a patch I posted to apcupsd-users. The 
BSD UHCI driver has a tendency to leave transfers on the queue when they 
complete 'short' (i.e., with fewer bytes than expected). This happens often 
in apcupsd-3.10.17 due to some poor coding on my part, but can also happen 
on UPSes having broken firmware that sends fewer bytes than the report 
descriptor claims. (These UPSes do not deadlock on Linux, so I think there 
is still a BSD UHCI bug here, but luckily it can be worked around in 
apcupsd.)

Patch against apcupsd-3.10.17 attached. Let me know if it solves the problem 
for you.

--Adam
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