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. Rafael _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
