Re: [PATCHv3 0/4] drivers/base: bugfix for supplier<-consumer ordering in device_kset

From: Pingfan Liu
Date: Tue Jul 03 2018 - 22:47:23 EST

On Tue, Jul 3, 2018 at 10:36 PM Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> On Tuesday, July 3, 2018 8:50:38 AM CEST Pingfan Liu wrote:
> > commit 52cdbdd49853 ("driver core: correct device's shutdown order")
> > places an assumption of supplier<-consumer order on the process of probe.
> > But it turns out to break down the parent <- child order in some scene.
> > E.g in pci, a bridge is enabled by pci core, and behind it, the devices
> > have been probed. Then comes the bridge's module, which enables extra
> > feature(such as hotplug) on this bridge.
> So what *exactly* does happen in that case?
I saw the shpc_probe() is called on the bridge, although the probing
failed on that bare-metal. But if it success, then it will enable the
hotplug feature on the bridge.