Re: [RFC][PATCH] PM: Make PM core handle device registrationsconcurrent with suspend/hibernation

[Alan Stern]

On Thu, 6 Mar 2008, Rafael J. Wysocki wrote:

> > > Well, can it happen in practice?  If it can, then what way can it happen?
> > 
> > Yes, it can happen in practice when a new module is loaded.  In some 
> > ways, modules' init routines are like probe methods.
> 
> Hmm, I'm not sure if it really is possible to load a module when all devices
> have been suspended.  Never mind, though.

You can load the module before devices are suspended, and then its init 
routine can run while the suspend is starting.

> > To be safe, I think we should make system sleep mutually exclusive with 
> > module loading.
> 
> Okay, is the (yet another) version of the patch below fine by you?

Yes, it's fine.  Mutual exclusion with module loading can be added 
later.  (Ironically, it may require putting pm_sleep_rwsem back!)

Alan Stern

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