linux-kernel - Re: [stable] pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

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Date:	Mon, 28 May 2007 22:23:14 -0700
From:	Greg KH <greg@...ah.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Pavel Machek <pavel@....cz>, Chris Wright <chrisw@...s-sol.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Theodore Ts'o <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Justin Forbes <jmforbes@...uxtx.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Romano Giannetti <romanol@...omillas.es>,
	Randy Dunlap <rdunlap@...otime.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Dave Jones <davej@...hat.com>, akpm@...ux-foundation.org,
	Chuck Wolber <chuckw@...ntumlinux.com>, stable@...nel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [stable] pcmcia resume 60 second hang. Re: [patch 00/69]
	-stable review

On Mon, May 28, 2007 at 09:53:50AM -0700, Linus Torvalds wrote:
> 
> Before we suspend a device, we call the subsystem that that device has 
> been registered with. Ie, we have code like this:
> 
> 	if (dev->class && dev->class->suspend)
> 		error = dev->class->suspend(dev, state);
> 
> which was very much designed so that individual devices wouldn't have to 
> always know - if the upper layer devices for that class can handle these 
> things, they should.
> 
> Do people actually _do_ this, right now? No. But we do actually have the 
> infrastructure, and I think we have one or two classes that actually do 
> use it (at least the "rfkill_class" has a suspend member, dunno how well 
> this model actually works).
> 
> I think Greg had some patches to make network drivers use this, for 
> example. Network drivers right now all end up doing stuff that really 
> doesn't belong in the driver at all when they suspend, and the 
> infrastructure _should_ just do it for them (ie do all the _network_ 
> related stuff, as opposed to the actual hardware-related stuff).

Yes, I started to work on it, as it is the correct thing to do, but got
sidetracked, sorry :(

> (Examples of things that we probably _should_ do for network devices on a 
> class level:
> 
> 	suspend:
> 		netif_poll_disable()
> 		if (netif_running(dev))
> 			dev->stop(dev);
> 
> 	resume:
> 		if (netif_running(dev))
> 			dev->start(dev);
> 		netif_poll_enable(dev);
> 
> or something similar).

I'll try to hack something together later this week along this line and
see how it works...

thanks,

greg k-h
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