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

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Message-ID: <Pine.LNX.4.44L0.0803061656180.19564-100000@iolanthe.rowland.org>
Date:	Thu, 6 Mar 2008 16:58:31 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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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