The hub driver is inefficient about the way it checks hub/port statuses.  
Whenever a status interrupt message is received, it always checks _all_
the ports plus the hub itself.  However, the status message contains a
bitmask indicating exactly which ports (or hub) have pending status
changes, and in principle we could use that information.

Is there any practical reason not to check just the ports (or hub) listed 
in the status interrupt message?

Alan Stern



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