USB drivers don't talk suspend/resume yet, so they won't notice missing features there. Regressions are a different story though.
But I can imagine that usb-storage (or is that SCSI?) might want to veto suspending devices that are being used for some kinds of i/o. Eventually it should exist.
For what kind of I/O? I do not see a reason for disk to veto suspend. CD-burner might want to do that, but it still would be bad idea... (Running on battery, battery goes low, and you destroy your CD *and* your filesystem.
If it's in the middle of any kind of write, suspending would seem to be unwise. Say, writing to a swap partition...
Mostly I'm just saying that if vetoing ever makes sense (and I understand that it does), USB drivers will need to understand it too.
- Dave
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