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

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Message-ID: <20070528130125.GK18807@elf.ucw.cz>
Date:	Mon, 28 May 2007 15:01:25 +0200
From:	Pavel Machek <pavel@....cz>
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>,
	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

Hi!

> >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.
> >
> >Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> >
> > drivers/base/firmware_class.c |   36 ++++++++++++++++++++++++++++++ 
> >++++++
> > 1 file changed, 36 insertions(+)
> 
> I don't like this approach, as I feel that the firmware loading  
> interface should be able to detect if a firmware load request is not  
> being handled, due to absence of userspace / hotplug handler presence.

I don't think that's possible. If hotplug handler needs /dev/foo, but
/dev/foo is not available, it will just block waiting there.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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