Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH] PM: Acquire device locks on suspend | Date | Sat, 5 Jan 2008 22:13:38 +0100 |
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On Saturday, 5 of January 2008, Alan Stern wrote: > On Sat, 5 Jan 2008, Rafael J. Wysocki wrote: > > > > Another thing to watch out for: Just in case somebody ends up calling > > > destroy_suspended_device(dev) from within dev's own resume method, you > > > should interchange the resume_device() and the list_move_tail() > > > calls in dpm_resume(). > > > > However, if we unregister them all at once after releasing pm_sleep_rwsem, > > that shouldn't be necessary, right? > > It's still necessary, because destroy_suspended_device() still has to > move the device from one list to another. You don't want it to end up > on the dpm_locked list.
Hmm. That means we'd have to do the same thing in dpm_power_up() in case someone calls destroy_suspended_device() from resume_device_early(dev).
Still, even doing that is not enough, since someone can call destroy_suspended_device() from a .suspend() routine and then the device will end up on a wrong list just as well.
Greetings, Rafael
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