On Thu, 13 Oct 2011, Ming Lei wrote: > Hi, > > On Thu, Oct 13, 2011 at 10:31 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > >> Maybe we should understand the correct model of the ordering constraints > >> for the multiple device dependancies first, could you give a description or > >> some examples about it? > > > > The requirement is that devices must be capable of resuming in the > > order given by dpm_list, and they must be capable of suspending in > > the reverse order. > > > > Therefore if device A can't work unless device B is functional, then B > > must come before A in dpm_list. > > If all devices can support async suspend and resume correctly, looks like > the device order given by dpm_list is not needed any longer, doesn't it? It _is_ needed, because the user can disable async suspend/resume via /sys/power/pm_async. Also, not all devices do support async suspend/resume. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
