On Sunday 20 December 2009, Alan Stern wrote: > On Sat, 19 Dec 2009, Rafael J. Wysocki wrote: > > > On Friday 18 December 2009, Alan Stern wrote: > > > On Fri, 18 Dec 2009, Rafael J. Wysocki wrote: > > > > > > > I didn't manage to do that, but I was able to mark sd and i8042 as async and > > > > see the impact of this. > > > > > > Apparently this didn't do what you wanted. In the nx6325 > > > sd+i8042+async+extra log, the 0:0:0:0 device (which is a SCSI disk) was > > To be precise, the device is an ATA or SATA disk but it is managed by > the sd driver. > > > > suspended by the main thread instead of an async thread. > > > > Hm, that's odd, because there's a noticeable time difference between the > > two cases in which the sd is sync and async. I'll look into it further. > > I don't know what the whole story is, but the PID number tells the > tale. > > > > There's an important point I neglected to mention before. Your logs > > > don't show anything for devices with no suspend callbacks at all. > > > Nevertheless, these devices sit on the device list and prevent other > > > devices from suspending or resuming as soon as they could. > > > > Unless they are async, that is. > > Yes. It would be simpler to make them async. But first we ought to > know what they are. Can you add an extra line to the log for such > devices? Sure, I'll do that. > What I'm afraid of is that there might be a "normal" device with a > "normal" ancestor but with "abnormal" devices in between (where > "normal" means there is a suspend or resume routine and "abnormal" > means all the method pointers are NULL). I know that this happens when > there's a USB mass-storage device, for example. If we complete the > intermediate devices immediately, then there won't be anything to > prevent the ancestor from suspending before the device or the device > from resuming before the ancestor. I'm afraid of that too. Rafael _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
