linux-kernel - Re: [linux-pm] Is it supposed to be ok to call del

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Message-Id: <201005152230.10230.rjw@sisk.pl>
Date:	Sat, 15 May 2010 22:30:10 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>,
	Jens Axboe <jens.axboe@...cle.com>
Cc:	Matt Reimer <mattjreimer@...il.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	"linux-pm" <linux-pm@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: [linux-pm] Is it supposed to be ok to call del_gendisk while userspace is frozen?

On Saturday 15 May 2010, Alan Stern wrote:
> On Thu, 13 May 2010, Matt Reimer wrote:
> 
> > > I don't see anything wrong with the patch itself, but I dislike the
> > > description.  Devices can come and go from any hotpluggable bus, not
> > > just MMC/SD.  That just happens to be the first place the problem was
> > > observed.
> > 
> > Good point. How about this?
> > 
> > Matt
> > 
> > From 813bd223e5a2fa577b9e64ddf12654a93d0aab8b Mon Sep 17 00:00:00 2001
> > From: Matt Reimer <mreimer@...systems.com>
> > Date: Thu, 13 May 2010 14:36:54 -0700
> > Subject: [PATCH] fs: prevent hang on suspend/resume when MMC/SD card present
> > 
> > Devices can come and go bus during suspend or resume, when the
> > writeback thread is frozen, resulting in a hang. Prevent the hang
> > by thawing the writeback thread in del_gendisk().
> 
> I would have said "the block layer's writeback thread", but this is 
> okay.

OK, so now I have a question who's going to take the patch.

Jens, what's your opinion?

Rafael
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