linux-kernel - Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

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Message-ID: <20070529130459.GJ23046@elf.ucw.cz>
Date:	Tue, 29 May 2007 15:04:59 +0200
From:	Pavel Machek <pavel@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Romano Giannetti <romanol@...omillas.es>,
	Chris Wright <chrisw@...s-sol.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

Hi!

> > I guess we should warn the driver authors, then; and decide what driver 
> > authors should do.
> 
> Drivers really shouldn't do anythign at all.

*)

> > If I'm video4linux driver for grabbing screen, have been suspended, and 
> > someone asks me to read a frame, should I
> > 
> > a) return -ESORRYIMSUSPENDED
> > 
> > b) just block the caller
> 
> The "subsystem" thing should have stopped the queues, and the device 
> should never even _see_ this.

Okay, _if_ there's a subsystem, subsystem should have stopped the
queues. End result should be that userspace is blocked when trying to
access suspended device/suspended subsystem.

I guess we are in violent agreement.
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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