linux-kernel - Re: [Bug 10030] Suspend doesn't work when SD card is inserted

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Date:	Wed, 20 Feb 2008 11:42:56 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pierre Ossman <drzeus-mmc@...eus.cx>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [Bug 10030] Suspend doesn't work when SD card is inserted

On Tue, 19 Feb 2008 bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=10030
> 
> 
> 
> 
> 
> ------- Comment #14 from rjw@...k.pl  2008-02-19 15:23 -------
> Thanks a lot for the debugging work!
> 
> First, the patch triggers, which means that the problem discovered by Alan is
> troubling us.  [Alan, do you have an idea how to fix that cleanly?]

I suggest we ask the maintainer for the MMC subsystem.

Pierre, you can find the details in the bugzilla entry.  Briefly,
there's a pathway in the MMC core suspend routine (if the driver
doesn't implement a resume hook) which could lead to the host being
removed during a system suspend.  This is an illegal operation and it
will deadlock.

Do you have a suggestion for a way to fix it?

Alan Stern

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