Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [lm-sensors] broken suspend [Was: 2.6.24-rc2-mm1] | Date | Wed, 21 Nov 2007 20:19:43 +0100 |
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On Wednesday, 21 of November 2007, Alan Stern wrote: > On Wed, 21 Nov 2007, Rafael J. Wysocki wrote: > > > > Is it possible to unregister a driver on CPU_DOWN_PREPARE_FROZEN? > > > > No. In that case the suspend core is holding the device's mutex and your > > attempt to unregister it will deadlock with it. > > > > Do you _have_ _to_ unregister the device at all? Why don't you just leave > > it registered on CPU_DOWN_PREPARE_FROZEN? The CPU is not going away > > physically in this case and it's _guaranteed_ that _cpu_up() will be called on > > it as soon as the hibernation image is ready or we are back from suspend. > > This leaves the device registered if for some reason the number of CPUs > after resuming from hibernation is smaller than the number of CPUs > before hibernation. Of course, in theory that's never supposed to > happen...
Yes, that clearly would be a bug.
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