Re: [PATCH] bttv driver II

From: Gerd Knorr (
Date: Wed May 24 2000 - 14:30:20 EST

On Wed, 24 May 2000, Alan Cox wrote:

> > Eventually the semaphore will be replaced by the
> > spinlock (at least most ocurrences) but I need more than
> > a couple of hours looking at the code for the first time
> > to do it right...
> I think you will find you need both. Look at set_pll() for example. We can't
> sleep holding a spinlock and we certainly cannot have people re-entering
> set_pll()

... and on the other hand you can't use semaphores in irq handlers.
I see. I'll review the locking problems.


Protecting the children is a good way to get a lot of adults who cant
stand up for themselves.		-- seen in some sig on /.

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