lkml.org 
[lkml]   [2018]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCHv3 0/4] drivers/base: bugfix for supplier<-consumer ordering in device_kset
Date
On Wednesday, July 4, 2018 4:47:07 AM CEST Pingfan Liu wrote:
> On Tue, Jul 3, 2018 at 10:36 PM Rafael J. Wysocki <rjw@rjwysocki.net> 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.

I don't understand what you are saying here, sorry.

device_reorder_to_tail() walks the entire device hierarchy below the target
and moves all of the children in there *after* their parents.

How can it break "the parent <- child order" then?

Thanks,
Rafael

\
 
 \ /
  Last update: 2018-07-04 12:23    [W:0.084 / U:1.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site