linux-kernel - Re: [regression] CD-ROM polling blocks suspend on some machines (Re: [PATCH 1/2] cdrom: always check_disk

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Date:	Mon, 31 Oct 2011 10:28:12 +0100
From:	Matthijs Kooijman <matthijs@...in.nl>
To:	Tejun Heo <tj@...nel.org>
Cc:	Gaudenz Steinlin <gaudenz@...ian.org>,
	linux-kernel@...r.kernel.org,
	Jameson Graef Rollins <jrollins@...estructure.net>,
	Jonathan Nieder <jrnieder@...il.com>,
	Jens Axboe <axboe@...nel.dk>, Amit Shah <amit.shah@...hat.com>,
	David Zeuthen <zeuthen@...il.com>,
	Martin Pitt <martin.pitt@...ntu.com>
Subject: Re: [regression] CD-ROM polling blocks suspend on some machines
	(Re: [PATCH 1/2] cdrom: always check_disk_change() on open)

Hi Tejun,

> The kworker submitted request but it got lost during queue destruction
> and blk_execute_rq() hangs.  There have been a number of recent
> changes in block devel tree to address this issue.  Can you please
> test the following branch?
> 
>  git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git block-ref
I'm running this kernel now and the problem seems to have disappeared.
I've done a dozen or so undocks and suspends, without any problems.
Also, the "udisks-daemon" process in ps now says "not polling any
devices" after undocking, where it would continue to say "polling sr0"
before.

I'll continue running this kernel for a while and inform you if the
problem resurfaces.

Any other tests I should be doing?

Thanks,

Matthijs

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