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Date:	Fri, 14 May 2010 22:32:41 -0400 (EDT)
From:	Alan Stern <>
To:	Matt Reimer <>
cc:	"Rafael J. Wysocki" <>,
	linux-kernel <>,
	Jens Axboe <>,
	Maxim Levitsky <>,
	linux-pm <>,
	Andrew Morton <>,
	Pavel Machek <>
Subject: Re: [linux-pm] Is it supposed to be ok to call del_gendisk while 
 userspace is frozen?

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 <>
> 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 

Alan Stern

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