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From: John Baldwin <jhb@freebsd.org>
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	(bigwig.baldwin.cx); Mon, 15 Aug 2011 13:30:09 -0400 (EDT)
Cc: 
Subject: Re: Urgent interrupt thread
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On Friday, August 12, 2011 4:59:18 am Ninad Adi wrote:
> Thanks for your prompt replies sir,
> just one more clarification
> 
> the routine bus_setup_intr has 5th arg of
> type driver_intr_t ithread then if I am not
> wrong my isr is running as a thread, probably
> thats the reason why latest drivers dont use
> Deferring mechanism like iwi, iwn, ral. However
> Atheros is still using taskqueues which is considerably old I suppose.
> So using filter+ithread model without deferring
> Should be fine.
> Plz let me know your opinions on the same,
> It would help me understand freebsd better.
> Will not disturb you more.
> Awaiting,reply

You should just use the 'driver_intr_t' method which will be a function that 
runs in an ithread.  It cannot sleep in that it cannot call functions like 
tsleep() or cv_wait() or use "sleepable" locks like sx(9) locks.  It can, 
however, use other locks such as mutexes and rwlocks.  It can also wakeup 
other sleeping threads using cv_signal/broadcast, wakeup(), etc.  In general 
you probably don't need to use a filter routine.

-- 
John Baldwin