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Subject: Re: [RFC] New Driver Model for 2.5
To: benh@kernel.crashing.org (Benjamin Herrenschmidt)
Date: Thu, 25 Oct 2001 13:22:32 +0100 (BST)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), linux-kernel@vger.kernel.org
In-Reply-To: <20011025075832.27776@smtp.wanadoo.fr> from "Benjamin Herrenschmidt" at Oct 25, 2001 09:58:32 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> >Sound is more easily handled by not blocking user space but waiting until
> >the final IRQ off moment and grabbing the registers. That avoids a lot
> >of ugly locking gunge. It literally comes down to
> 
> My point about using a semaphore was to avoid getting mixer ioctls
> banging the HW while it is shut down.

Yes I can follow that - you want to avoid the aclink being shut down while
active. That seems to be just part of the ordering. I'd also put the ac97
save/restore in the ac97_codec.c stuff - lets write it once 8)
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