Re: Queue locking control in loadable modules

Hi Gary.

> We are making use of the lis_register_driver_qlock_option method to
> remove the qlock protection on some of our drivers 

I trust you are not doing anything SMP.  Realize that this probably
puts you on the bleeding edge, even on uP.  Are you having some
difficulty with the default LIS_QLOCK_QUEUE?  Or is it performance
related (not sure this change would help that)?

> and have some
> question on the correct way to use it.  If the driver is a clone driver
> I suspect that we would use the major number returned by the register
> call.  

Although I have not used this function, that's the way I read
the code.

> What is the queue locking state of the clone driver and do we
> need to control this also? 

The stream head corresponding to the stream containing your
driver queues uses LIS_QLOCK_QUEUE (see the lis_set_q_sync() call
in lis_stropen()).  You can't control that from the outside (ie,
you'd have to make code changes to LiS).

Regards,
	Steve

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Steve Schefter                               phone: +1 705 725 9999 x26
The Software Group Limited                     fax: +1 705 725 9666
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