> I think it's a fairly significant change from the current freezer and I
> also think it's a very good idea. The more I think about it, the more I
> like it, in the sense that it's a simple drop-in that you could put in a
> lot of the ioctl path of drivers to just block tasks that are trying to
> call in while suspending, and could be used selectively by things like
> the USB hub threads.
Note that we could have also a per-device "icebox" (just a waitqueue).
Might be nice for a device to resume whatever it froze just after it
resumed itself, might even be necessary in case whatever thread got
frozen is necessary for handling child devices.
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