timing out on a semaphore

[Tim Waugh]

I'm trying to chase down a semaphore time-out problem.  I want to
sleep on a semaphore until either

(a) it's signalled, or
(b) some amount of time has elapsed.

What I'm doing is calling add_timer, and then down_interruptible, and
finally del_timer.  The timer's function ups the semaphore.

The code is in parport_wait_event, in drivers/parport/ieee1284.c.

Can anyone see anything obviously wrong with it?  It seems to
sometimes get stuck.

Tim.
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