lkml.org 
[lkml]   [2012]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [Resend][PATCH] PM: Move disabling/enabling runtime PM to late suspend/early resume
Date
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.wysocki@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_braun@gmx.net>
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@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.


\
 
 \ /
  Last update: 2012-12-16 03:01    [W:0.247 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site