On Sun, 2009-12-06 at 10:23 -0500, Alan Stern wrote: > On Sat, 5 Dec 2009, Linus Torvalds wrote: > That's ridiculous. Having gone to all the trouble of building a device > tree, one which is presumably still almost entirely correct, why go to > all the trouble of tearing it down only to rebuild it again? (Note: > I'm talking about resume-from-RAM here, not resume-from-hibernation.) There should be nothing special or privileged at all about the device tree that gets built at boot time. Consider the scenario of the laptop user with a docking station. Adding, removing, and rewriting vast swaths of the device tree across suspend/resume and hibernate/thaw is very easy to do when you are plugging a laptop into one or more docking stations. > Instead what we do is verify that the devices we remember from before > the suspend are still there, and then asynchronously handle new devices > which have been plugged in during the meantime. Doing this involves > relatively little extra or new code; most of the routines are shared > with the runtime PM and device reset paths. Devices can vanish across suspend to RAM just as easily as they can be added. > > _______________________________________________ > linux-pm mailing list > linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx > https://lists.linux-foundation.org/mailman/listinfo/linux-pm _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
