On Friday, 13 July 2007 17:50, Alan Stern wrote: > On Fri, 13 Jul 2007, Rafael J. Wysocki wrote: > > > Okay, I have thought it through and I think that, as an initial step, we can do > > something like this: > > > > - preload the image-saving kernel before hibernation > > - in the hibernation code path replace device_suspend() with the shutting down of > > all devices without unregistering them (not very nice, but should be sufficient > > for a while) > > - when we've called device_power_down() and save_processor_state(), jump to > > the image-saving kernel and let it run > > - make the image-saving kernel set up everything, save the image without > > starting any user space (we may use the existing image-saving code for this > > purpose, with some modifications) and power off the system (or make it enter > > S4) > > - use the existing restoration code to load the image and jump to the > > hibernated kernel > > - in the restore code patch replace device_resume() with the reprobing of all > > devices. > > > > Comments? > > I doubt that re-probing devices will work. The probe routine won't > expect there to be any registered children, so it will try to > re-register them. I didn't mean to use .probe() for that. I just used the term "reprobe" as similar to "reinit", but not exactly the same. > On the other hand, post_restore methods could be written to expect > something like this. Yes, that's what I'm thinking of. Greetings, Rafael -- "Premature optimization is the root of all evil." - Donald Knuth _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
