Re: [PATCH v2 3/3] nvme: fire discovery log page change events to userspace

[Sagi Grimberg]

> > > Yes we do, userspace should use it to order events.  Does udev not
> > > handle that properly today?
> >
> > The problem is not ordering of events, its really about the fact that
> > the chardev can be removed and reallocated for a different controller
> > (could be a completely different discovery controller) by the time
> > that userspace handles the event.
>
> The same is generally true for lot of kernel devices.  We could reduce
> the chance by using the idr cyclic allocator.

Well, it was raised by Hannes and James, so I'll ask them respond here
because I don't mind having it this way. I personally think that this
is a better approach than having a cyclic idr allocator. In general, I
don't necessarily think that this is a good idea to have cyclic
controller enumerations if we don't absolutely have to...