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Date: Tue, 07 Nov 2000 10:55:37 +0100
From: Helge Hafting <helgehaf@idb.hist.no>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
CC: "Eric W. Biederman" <ebiederm@xmission.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Oliver Xymoron <oxymoron@waste.org>, Keith Owens <kaos@ocs.com.au>,
        linux-kernel@vger.kernel.org
Subject: Re: Persistent module storage [was Linux 2.4 Status / TODO page]
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Alan Cox wrote:
> 
> > It would probably be better (in this case) to increment the module count
> > when the mixer settings go above 0, and decrement it when the settings
> > go totally to 0.  This prevents an unwanted unload.
> 
> Thats about 200 lines of code and also about 50,000 emails complaining people
> cannot unload sound stuff.

Still, it is so logical.  Modules cannot be unloaded when in use.
"use" is usually "someone having the device open".  But
"someone listening to pass-through sound" is effectively using
the mixer - the module is in use in another way.  Network drivers
don't have a /dev/xxx to open/close either.

Having to turn off the master volume before unloading makes sense
to me.  (The driver may still free up DMA buffers when
nobody need them, i.e. when /dev/dsp haven't been used for some time.)


Helge Hafting
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