linux-kernel - Re: [PATCH] Remove process freezer from suspend to RAM pathway

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1183929708.3388.306.camel@localhost.localdomain>
Date:	Mon, 09 Jul 2007 07:21:48 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH] Remove process freezer from suspend to RAM pathway

On Sun, 2007-07-08 at 16:22 -0400, Alan Stern wrote:
> On Sun, 8 Jul 2007, Rafael J. Wysocki wrote:
> 
> > I'm all for changing this infrastructure, but in an organized way (ie. we
> > discuss what to do next, we do that and then we go to the next step) and in
> > the order that everyone will be comfortable with.
> > 
> > So, let's finish this thread and start over from discussing what needs to be
> > done, how (ie. in what order etc.) we are going to do that and who is going to
> > do what.  Shall we?
> 
> IMO we should start by using the new notifier chain and by implementing 
> a central "icebox" routine.  Then we can forbid device registration 
> during suspend.
> 
> It might also be a good idea to add a freezable keventd-like workqueue 
> specifically intended for things that need to block during a suspend.  
> Although maybe this will end up being unnecessary; it's too soon to 
> tell.

I think looking at the kmallo/gfp issue I mentioned earlier should be
done asap. I can try to spare some time for it this week but I can't
promise, I'm actually swamped by something totally unrelated at the
moment.

Another issue that's been a problem forever with suspend is the
synchronous request_firmware interface. Lots of drivers do that in
resume() which will generally not work.

Ben.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/