On Saturday, December 15, 2012 10:16:29 PM Jiri Kosina wrote: > On Sat, 15 Dec 2012, Rafael J. Wysocki wrote: > > > From: Rafael J. Wysocki <rafael.j.wyso...@intel.com> > > > > Currently, the PM core disables runtime PM for all devices right > > after executing subsystem/driver .suspend() callbacks for them > > and re-enables it right before executing subsystem/driver .resume() > > callbacks for them. This may lead to problems when there are > > two devices such that the .suspend() callback executed for one of > > them depends on runtime PM working for the other. In that case, > > if runtime PM has already been disabled for the second device, > > the first one's .suspend() won't work correctly (and analogously > > for resume). > > > > To make those issues go away, make the PM core disable runtime PM > > for devices right before executing subsystem/driver .suspend_late() > > callbacks for them and enable runtime PM for them right after > > executing subsystem/driver .resume_early() callbacks for them. This > > way the potential conflitcs between .suspend_late()/.resume_early() > > and their runtime PM counterparts are still prevented from happening, > > but the subtle ordering issues related to disabling/enabling runtime > > PM for devices during system suspend/resume are much easier to avoid. > > > > Reported-and-tested-by: Jan-Matthias Braun <jan_br...@gmx.net> > > Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> > > Hi Rafael, > > just curious what is the reason for resend? Do you want to gather more > Acks before pushing this upstream?
Well, I thought that some people might actually look at it when they found it again in their mailboxes. :-) Thanks, Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/