linux-kernel - Re: Suspend/resume semantics for ISDN drivers (was: NAK new drivers without proper power management?)

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Message-ID: <20070308233520.GD2793@elf.ucw.cz>
Date:	Fri, 9 Mar 2007 00:35:20 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Tilman Schmidt <tilman@...p.cc>,
	LKML <linux-kernel@...r.kernel.org>, nigel@...el.suspend2.net,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: Suspend/resume semantics for ISDN drivers (was: NAK new drivers without proper power management?)

Hi!

> > On 12.02.2007 01:10 I wrote:
> > > I don't doubt your basic assessment. However it doesn't translate that
> > > easily into a real implementation. In my case, I maintain a USB driver,
> > > so I have to deal with USB specifics of suspend/resume which happen not
> > > to be that well documented. My driver provides an isdn4linux device but
> > > isdn4linux knows nothing about suspend/resume so I am on my own on how
> > > to reconcile the two. The device itself, though in turn far from trivial,
> > > is actually the least of my worries.
> > 
> > So, how *should* an isdn4linux driver handle a request to suspend?
> > Specifically, if there are active connections, should it try to
> > shut them down in an orderly fashion (which might imply some delays
> > waiting for the remote station to acknowledge, etc.)? Should it kill
> > them abruptly (as for a USB unplug event)? Or should it just refuse
> > to suspend while a connection is still active?
> 
> I think that refusing to suspend wouldn't be a good approach (think of an
> emergency suspend when the battery is running low).
> 
> Probably the closing of connections would be the nicest thing from the
> user's point of view.

It depends on "how long does connection close take". If it is more
than few seconds, kill them abruptly.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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