linux-kernel - Re: [RFC][PATCH] PM: Make PM core handle device registrations concurrent with suspend/hibernation

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Date:	Thu, 6 Mar 2008 23:30:27 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Pavel Machek <pavel@....cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] PM: Make PM core handle device registrations concurrent with suspend/hibernation

On Thursday, 6 of March 2008, Alan Stern wrote:
> 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.

Yeah.

> > > 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!)

I'm going to send this patch and the "include dpm_sysfs_add() into
device_pm_add()" patch for -mm/linux-next testing, if you don't mind.

I'm working on a new version of the "PM: Separate suspend and hibernation
callbacks" patch, on top of the two.

Thanks,
Rafael
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