Messages in this thread | | | From | Jeremy Maitin-Shepard <> | Subject | Re: [linux-pm] Re: Hibernation considerations | Date | Fri, 20 Jul 2007 18:48:24 -0400 |
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Alan Stern <stern@rowland.harvard.edu> writes:
> On Fri, 20 Jul 2007, Jeremy Maitin-Shepard wrote: >> >> when doing a suspend-to-ram you get to a point where you just don't use >> >> any userspace. >> >> > What do you mean? How can you prevent user tasks from running? That's >> > basically what the freezer does, and the whole point of this approach >> > is to eliminate the freezer. Right? >> >> Presumably no tasks at all would be scheduled.
> How would you prevent tasks from being scheduled? How would you > prevent drivers from deadlocking because in order to put their device > in a low-power state they need to acquire a lock which is held by a > user task?
Perhaps this isn't an issue once the device is already quiesced. I'm just conjecturing.
[snip]
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