linux-kernel - Re: [linux-pm] Re: Hibernation considerations

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Message-Id: <200707231623.17958.oliver@neukum.org>
Date:	Mon, 23 Jul 2007 16:23:17 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Milton Miller <miltonm@....com>, Ying Huang <ying.huang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, David Lang <david@...g.hm>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	Jeremy Maitin-Shepard <jbms@....edu>
Subject: Re: [linux-pm] Re: Hibernation considerations

Am Samstag 21 Juli 2007 schrieb Alan Stern:
> On Fri, 20 Jul 2007, Oliver Neukum wrote:
> 
> > > We already have a pre-suspend notification available for drivers that 
> > > need to allocate large amounts of memory.
> > 
> > Is that facility fine grained enough?
> 
> It's a notifier chain that gets called at several points during the 
> suspend transition.  One of those points is right at the start, while 
> userspace is still running and reasonably large amounts of memory can 
> be allocated.
> 
> Is it fine-grained enough?  I don't know -- hard to tell, since nothing 
> much is using it yet.
> 
> > > You are correct about the need to delay/stop device addition.  I don't
> > > know how this can be done in general; each code path calling
> > > device_add() may have to be treated individually.
> > 
> > What about the old API?
> 
> What old API do you mean?

The find_device() stuff.

> >  Do we have to block module loading?
> 
> No.  Registering new drivers is okay, registering new devices is bad.

What if it is a driver for virtual devices that don't need probe()
for actual hardware?

> Of course, some modules do want to register a new device in their init 
> method.  I don't know what we should do about them.  Force the 
> registration to fail, I suppose.  How often will people suspend while a 
> module is loading?
> 
> > What happens if a scsi error handler is woken? If it cannot be woken,
> > how are errors handled?
> 
> Why should the error handler wake up?  There isn't supposed to be any 
> I/O going on, hence no errors to handle.

What about shared busses? Firewire, FibreChannel? They can get external
resets, etc ...

	Regards
		Oliver
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