Messages in this thread | | | Subject | Re: [linux-pm] [GIT PULL] PM updates for 2.6.33 | From | Victor Lowther <> | Date | Sun, 06 Dec 2009 13:04:36 -0600 |
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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@lists.linux-foundation.org > https://lists.linux-foundation.org/mailman/listinfo/linux-pm
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