[linux-pm] calling runtime PM from system PM methods

Alan Stern stern at rowland.harvard.edu
Thu Jun 2 11:38:01 PDT 2011


On Thu, 2 Jun 2011, Kevin Hilman wrote:

> OK.  I was trying to catch that by checking pm_runtime_suspended(), but
> now see that that cannot work in general.
> 
> The problem I'm trying to solve is how (or whether) I can use runtime PM
> from the system PM methods, specifically in the case where runtime PM
> has been disabled from userspace (or pm_runtime_forbid() has been
> called.)  
> 
> In a nutshell, what I'm after is for any pm_runtime_forbid() calls to be
> cancelled during system PM, thus allowing pending runtime PM events to
> occur during system PM.

There are a few approaches that might do what you want.  But I'd like 
to hear Rafael's opinion before making any suggestions.

Alan Stern



More information about the linux-pm mailing list