Re: (remove) event not supported.

[Brad Hards <bhards@bigpond.net.au>]

David Hinds wrote:
> 
> On Fri, Mar 30, 2001 at 06:03:32PM -0800, Keith Owens wrote:
> >
> > AFAICT there is no need for another count, you can do MOD_INC_USE_COUNT
> > in any module function.  The use count does not have to be for just
> > open.  Add MOD_INC_USE_COUNT to the probe() function for each new
> > device.
> 
> So what if I want to unload a module for a device that still exists?
> These counts are also used in this way for non-hot-plugged devices.
> 
> For PCMCIA, device counts for each driver are published in
> /proc/bus/pccard/drivers, and cardmgr uses this information to help
> decide when to unload drivers.
Also a good point, but in general, you don't want to do this. If there
is a device still "connected" to the system, you don't want to remove
the driver. For development, you might like to simulate a disconnection,
but the normal approach is that you want support for every device that is
connected to the system. Why remove a module for a device you are using?

It might be appropriate to remove the module (simulating the disconnect)
on some other basis, like that it is close()'d, but I am not sure exactly
what makes sense here.

Brad

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