On Tue, 12 Nov 2013 00:10:28 -0800 Greg KH <gre...@linuxfoundation.org> wrote:
> On Tue, Nov 12, 2013 at 11:31:45AM +1100, NeilBrown wrote: > > Alternately, is there some "all devices have been probed, nothing new will > > appear unless it is hot-plugged" event. That would be equally useful (and > > probably mirrors what hardware-RAID cards do). > > No, there's no way to ever know this in a hotplug world, sorry. > Especially with USB devices, they show up when they show up, there's no > "oh look, the bus is all scanned now and all devices currently plugged > in are found" type knowledge at all. > > Then there are hotplug PCI systems where people slam in PCI cards > whenever they feel like it (remember, thunderbolt is PCI express...) > > Sorry, > > greg k-h Surely something must be possible. Clearly a physical hot-plug event will cause more devices to appear, but there must come a point at which no more (non-virtual) devices will appear unless a physical event happens? Or may unless "a physical event or a deliberate configuration change" happens. Maybe it is hard. Maybe it is too hard. But surely it is at least theoretically possible. NeilBrown
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