linux-kernel - Re: question on resume()

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Message-Id: <200701292204.33112.oliver@neukum.org>
Date:	Mon, 29 Jan 2007 22:04:32 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	nigel@...el.suspend2.net
Cc:	linux-kernel@...r.kernel.org
Subject: Re: question on resume()

Am Montag, 29. Januar 2007 21:14 schrieb Nigel Cunningham:
> Hi.
> 
> On Mon, 2007-01-29 at 12:34 +0100, Oliver Neukum wrote:
> > Am Montag, 29. Januar 2007 12:24 schrieb Nigel Cunningham:
> > > Hi.
> > > 
> > > On Mon, 2007-01-29 at 12:06 +0100, Oliver Neukum wrote:
> > > > Hi,
> > > > 
> > > > may a driver call wake_up() while doing resume() ?
> > > 
> > > I assume you mean waking a userspace process from drivers_resume(). If
> > > so, the answer is no - processes will still be frozen at the point. In
> > > the case of Suspend2, the LRU pages will still not have been read
> > > either, so Suspend2 users would hate you for making hibernation crash
> > > and burn :)
> > 
> > If so, how do I notify tasks presumably about to be thawed that their
> > IO failed?
> 
> Do you mean I/O to disk? If so, it won't fail. All pending I/O gets
> processed like normal either before or after suspending and resuming.
> 
> If you mean something like a packet being transmitted over the network,
> you should be using the normal paths for recording success/failure.

I am talking about a character device that puts requests onto a queue.
If the queue is restarted after resumption the normal error path is waking
up the waiting tasks.

	Regards
		Oliver
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