Hi,
there is a hardcoded sleep 3 in the usb.agent. But this is wrong, because the kernel runs all hotplug events at once for a new hub. The result is that every event still runs in parallel, just 3 seconds later.
That "sleep" is a workaround for "uhci" and "usb-uhci" bugs: they don't queue control transfers. No complete user mode workaround is possible; it doesn't affect just hotplug, or even just usbfs-based applications.
The real fix is just to get rid of it on 2.5, where "uhci-hcd" has been fixed, rather than to keep making all USB hotplugging be annoyingly slow.
That's why I won't merge this patch.
- Dave
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