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

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Message-ID: <Pine.LNX.4.44L0.1005142231390.11498-100000@netrider.rowland.org>
Date:	Fri, 14 May 2010 22:32:41 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Matt Reimer <mattjreimer@...il.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	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 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.

Alan Stern

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