Messages in this thread | | | From | Kevin Hilman <> | Subject | Re: [PATCH 1/1] PM / Runtime: let rpm_resume fail if rpm disabled and device suspended. | Date | Mon, 23 Jun 2014 11:57:37 -0700 |
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Alan Stern <stern@rowland.harvard.edu> writes:
[...]
> What we really need to figure out is how to tell the PM core which > devices may safely have their runtime callbacks invoked during system > suspend. For those devices, the core can avoid calling > pm_runtime_disable() during the suspend_late phase. That would address > your requirements, right?
Yes, and something I've attempted a few times over the years, most recently during the introduction of the pm_runtime_force* functions[1], which I thought was again an attempt to work around this issue.
I don't think Rafael has ever been too thrilled with that idea (including the last time[2]), but I think we're to a point now that we have to manage this somehow.
My attempt to let the bus/subsystem/pm_domain set a flag might be too simplistic, but I do agree we do need som way to tell the PM core that runtime PM callbacks are (still) safe.
Kevin
[1] http://marc.info/?l=linux-pm&m=139343222014989&w=2 [2] http://marc.info/?l=linux-pm&m=139346327619875&w=2
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