Am Mittwoch, 10. Juni 2009 21:27:56 schrieb Rafael J. Wysocki: > > What happens if the parent's parent is also suspended? It seems to me > > that you must code this recursively. > > Hmm, I thought I did. > > [Looks] > > pm_request_resume(dev) will call pm_request_resume(dev->parent), if > necessary, and that will call pm_request_resume(dev->parent->parent) and so > on. Each of them will queue a work item and the one for the topmost parent > will be queued first. So, the resume requests for all parents will be > executed before the one for the device, due to the fact that the workqueue > is singlethread. Sneaky, I overlooked that. > Well, there is a bug related to it, namely pm_autosuspend() may change the > status to RPM_SUSPENDED after pm_request_resume() has changed it to > RPM_WAKE, that needs fixing. Ok, maybe this is related. You recurse if the parent isn't in RPM_ACTIVE. But that is not enough. You must ensure that all the nodes higher up stay in RPM_ACTIVE. It seems to me that you must go up until you find an active node (or the root) and put it a blocked state. Regards Oliver _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
