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

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Message-Id: <200909120022.10808.rjw@sisk.pl>
Date:	Sat, 12 Sep 2009 00:22:10 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
Cc:	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Christoph Hellwig <hch@....de>,
	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 Friday 11 September 2009, Pavel Machek wrote:
> 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,

By whom exactly?

> but that's not how it works now.

Indeed.

Thanks,
Rafael
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