Re: Delayed hotplug events

[Oliver Neukum <oliver@neukum.org>]

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> > No, I would consider that redundant. If you let events queue up until
> > a counter reaches zero, you can guarantee that there's time to generate
> > all files being refered to in the event. There's no need to export it.
> > 
> Hmm. I see. But isn't this approach conceptually identical to my patch? 
> I mean, you're blocking events until a semaphore is set, whereas I'm 
> dropping events during the critical section and generate them again. No 
> big change.

Conceptually it makes no difference. But queueing events can be
encapsulated at the point the tasks are actually spawned. I don't see
the possibilty if you have to regenerate events.
I may, however, be wrong.

> And it doesn't change the main issue, which is that the behaviour of the 
> hotplug subsystem is changed (i.e. the time when events are sent).
> Adding just another attribute doesn't change it, as it's up to the 
> drivers to generate sysfs attributes.

No. An additional attribute is visible. Waiting is not. Assuming that the
attribute files are not there as the event is evaluated is _clearly_ wrong.
If you delay the events full compatibility is kept.
Waiting doesn't change anything fundamentally. It just makes sure that
the hotplug subsystem always behaves in a way it may behave currently.

	Regards
		Oliver
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