Date: Thu, 6 Mar 2008 16:58:31 -0500 (EST)
From: Alan Stern <stern@rowland.harvard.edu>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
cc: pm list <linux-pm@lists.linux-foundation.org>,
       Alexey Starikovskiy <astarikovskiy@suse.de>,
       Pavel Machek <pavel@ucw.cz>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PATCH] PM: Make PM core handle device registrations
 concurrent with suspend/hibernation
In-Reply-To: <200803062228.28104.rjw@sisk.pl>
Message-ID: <Pine.LNX.4.44L0.0803061656180.19564-100000@iolanthe.rowland.org>
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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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