Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH] PM / core: Fix direct_complete handling for devices with no callbacks | Date | Thu, 24 May 2018 12:13:30 +0200 |
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On Tuesday, May 22, 2018 1:41:06 PM CEST Ulf Hansson wrote: > On 22 May 2018 at 13:02, Rafael J. Wysocki <rjw@rjwysocki.net> wrote: > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > Commit 08810a4119aa (PM / core: Add NEVER_SKIP and SMART_PREPARE > > driver flags) inadvertently prevented the power.direct_complete flag > > from being set for devices without PM callbacks and with disabled > > runtime PM which also prevents power.direct_complete from being set > > for their parents. That led to problems including a resume crash on > > HP ZBook 14u. > > > > Restore the previous behavior by causing power.direct_complete to be > > set for those devices again, but do that in a more direct way to > > avoid overlooking that case in the future. > > > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=199693 > > Fixes: 08810a4119aa (PM / core: Add NEVER_SKIP and SMART_PREPARE driver flags) > > Reported-by: Thomas Martitz <kugel@rockbox.org> > > Tested-by: Thomas Martitz <kugel@rockbox.org> > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > It seems like the resume path of HP ZBook 14u is kind of fragile,
Yes, it is.
> in case it *requires* dev->power.direct_complete to be set for devices > like these. And that makes me wonder, that perhaps we should try to > address that issue as well, no?
Yes, in principle.
But since the direct_complete handling needs to be fixed anyway, it doesn't matter a lot in practice, because the resume issue on HP ZBook 14u will not be reproducible anyway then. And since the dependency clearly is on a device with no callbacks, I'm not worried too much about that.
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