linux-kernel - Re: Regression in suspend to ram in 2.6.31-rc kernels

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Date:	Fri, 11 Sep 2009 23:51:17 +0200
From:	Pavel Machek <pavel@....cz>
To:	Zdenek Kabelac <zdenek.kabelac@...il.com>
Cc:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Christoph Hellwig <hch@....de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mmc@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: Regression in suspend to ram in 2.6.31-rc kernels

On Fri 2009-09-11 23:45:01, Zdenek Kabelac wrote:
> 2009/9/11 Pavel Machek <pavel@....cz>:
> >
> >> And why suspend of mmc should generate card removal ??
> >
> > Card is powered down during suspend -> mmc can't guarantee the card is
> > same and unchanged -> it makes some sense to simulate
> > removal/reinsert.
> 
> But how is this going to work when I keep the device mounted and
> blockdev is basically destroyed -  what if I'm reading file from card
> during suspend ?

"Don't do it".

> >> if I suspend and resume my laptop and I keep the card inside - all
> >> those step looks plain wrong.
> >
> > Unfortunately system can't tell.
> 
> Well system could check basic card ids if they match after resume - if
> some users wants to crash his card by randomly swapping it during
> suspend/resume - I'd have no problem with that....

Well, I do have small problem with that :-).

Anyway, patch for rechecking IDs would probably be accepted, but
that's not how it works now.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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