Re: (remove) event not supported.

[David Brownell <david-b@pacbell.net>]

> > 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.

It's important to have the same policy for MOD_INC_USE_COUNT
in all drivers.  Including drivers, like network drivers, where the use
count updating is automated ... both for hotpluggable drivers, and for
the other kind.


> 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.

I suppose USB could add a third field to /proc/bus/usb/drivers;
and PCI could add a /proc/bus/pci/drivers file too.  It'd work.

Maybe those could be argued as 2.4 features; but going that way
doesn't seem like the right general direction.  It's clearly a generic
facility that all hotpluggable drivers need, which in my book means
it's best to do it only once.

- Dave



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