usb/82660: EHCI: I/O stuck in state 'physrd'/panic

[Stefan Walter]

Playing around with debug flags, I found out that I/O doesn't hang at all
when I set hw.usb.ehci.debug=15. The transfer seems slower than it could
be, though, and the machine becomes almost unresponsible until it's done
(i.e. switching from one window to another in X or typing a command in an
xterm takes a while).

Stefan
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