linux-kernel - Re: [RFC][PATCH -mm 3/3] PM: Disable _request

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Date:	Sun, 27 May 2007 23:49:30 +0200
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Matthew Garrett" <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"pm list" <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Nigel Cunningham" <nigel@...el.suspend2.net>,
	"Pavel Machek" <pavel@....cz>,
	"Alan Stern" <stern@...land.harvard.edu>,
	"Oliver Neukum" <oliver@...kum.org>
Subject: Re: [RFC][PATCH -mm 3/3] PM: Disable _request_firmware before hibernation/suspend

On 5/27/07, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> On Sun, May 27, 2007 at 10:31:53PM +0200, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> >
> > Use a hibernation and suspend notifier to disable the firmware requesting
> > mechanism before a hibernation/suspend and enable it after the operation.
>
> This avoids the problem of .resume methods calling userspace while
> userspace is frozen and a resulting hang, but does it actually result in
> the drivers beginning to work again? If we remove process freezing in
> STR, this should just work[1] without the need to complicate things. On
> the other hand, if we don't want to support these functions in the
> suspend and resume methods we could just audit the kernel and remove
> them all.

What exactly is the problem we see here? The timeout of the firmware loader?
What goes wrong with frozen userspace, usually there is only a netlink
message sent from the kernel, which should be received and handled
just fine when userspace is running again.

Thanks,
Kay
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