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

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Message-Id: <200705291641.43476.rob@landley.net>
Date:	Tue, 29 May 2007 16:41:41 -0400
From:	Rob Landley <rob@...dley.net>
To:	Michael-Luke Jones <mlj28@....ac.uk>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.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 Sunday 27 May 2007 4:45 pm, Michael-Luke Jones wrote:
> (Slightly OT: A particularly nasty race is when an initramfs  
> userspace is present, but firmware loading cannot occur because init  
> has not run, so proc hasn't been mounted, so a hotplug event handler  
> cannot be registered, despite the fact that the firmware is sitting  
> on the ramdisk mounted correctly...)

I believe that the current functionality is that /sbin/hotplug is the default.  
I think that if there is one in initramfs, it'll get called as a usermode 
helper, even before init has run.  (If it needs /proc /sys or /dev, setting 
it up properly is its problem, but not an insurmountable one.)

I remember discussion of this a while back, and that it was indeed 
intentional.  I dunno if anybody's actually tried it.

Rob
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