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

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Message-ID: <20090910192354.GD23356@elf.ucw.cz>
Date:	Thu, 10 Sep 2009 21:23:54 +0200
From:	Pavel Machek <pavel@....cz>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	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 Wed 2009-09-09 22:21:56, OGAWA Hirofumi wrote:
> Pavel Machek <pavel@....cz> writes:
> 
> >> It seems
> >> 
> >>     1) sync() (probabry "sync" command)
> >>     2) sync as part of suspend sequence
> >>     3) sync_filesystem() by mmc remove event
> >> 
> >> I guess the root-cause of the problem would be 3). However, it would not
> >> be easy to fix, at least, we would need to think about what we want to
> >> do for it. So, to workaround it for now, I've made this patch.
> >
> > MMC driver trying to synchronize filesystems looks like ugly layering
> > violation to me. Why are we doing that?
> 
> There is no _layering violation_ here. IIRC, mmc just tells card removed
> event to another layer (on some points of view, to tell event can be
> wrong though). The partition (block) layer does it by event.

So what is the problem? Emulating sync when card is already removed
seems little ... interesting?

-- 
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