We could alternatively do something similar to what OHCI does and use an even and odd frame list.
That's been gone from "ohci-hcd" for over a year now... it records frame numbers now (as Alan suggested).
The even/odd list only works if you somehow manage to have ensured that peak IRQ latency is far enough under 1 msec that it never gets out of sync. Which is unrealistic even on fast hardware, and it caused oopsing on slower systems.
- Dave
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