Re: (remove) event not supported.

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

David Brownell wrote:
> 
> > Mar 30 08:07:01 localhost /etc/hotplug/usb.agent: USB remove event not supported
> >
> > What are the issues associated with it. Is this something that just
> > hasn't been coded up or is it something that can't be coded up.
> 
> Awkward to code up.  What one really wants to happen is have
> the device's module removed ... and _maybe_ some driver-specific
> action (not that I can think of any examples just now).  But:
umounting a storage device? Or does that happen automatically? I am
not going to pull out a mounted zip drive to find out...

> - the dynamic linking framework doesn't track how many devices
>   are attached to each driver module ... so if there's another device
>   controlled by the same driver, but it's not opened, removing that
>   module would be incorrect.  ("module use count" doesn't cover
>   uses, just opens.)
This could be trivially extended to have a inc_dev_open_count() and
inc_dev_use_count(), where the use count get incremented in probe()
and the open count gets incremented in open(). Naturally you also
have to have a dec version of each as well, in disconnect() and 
close().
 
> - nothing's tracking which modules are used with which device,
>   and if the device is gone you can't query it to find that out!
maybe the driver could have a list of devices? not so easy to 
implement though.

Brad

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