linux-kernel - Re: question on resume()

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Message-Id: <1170101660.15820.18.camel@nigel.suspend2.net>
Date:	Tue, 30 Jan 2007 07:14:20 +1100
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Oliver Neukum <oliver@...kum.name>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: question on resume()

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.

HTH.

Nigel

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