linux-kernel - Re: mmotm 2010-09-15 - BUG in mmc driver calling led_trigger

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Message-ID: <20100922031452.GA4862@void.printf.net>
Date:	Wed, 22 Sep 2010 04:14:53 +0100
From:	Chris Ball <cjb@...top.org>
To:	Valdis.Kletnieks@...edu
Cc:	akpm@...ux-foundation.org, Richard Purdie <rpurdie@...ys.net>,
	Hein_Tibosch <hein_tibosch@...oo.es>,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: mmotm 2010-09-15 - BUG in mmc driver calling
	led_trigger_event()

Hi Valdis,

On Tue, Sep 21, 2010 at 11:01:47PM -0400, Valdis.Kletnieks@...edu wrote:
> [    2.934051] BUG: sleeping function called from invalid context at kernel/mutex.c:278
> [    2.934440] in_atomic(): 1, irqs_disabled(): 0, pid: 11, name: kworker/0:1
>
> [...]
> 
> Anything obvious to you guys? Race condition of some sort, or somebody
> else leaving a dangling in_atomic() status for us to get ambushed by?
> Maybe Hein's patches to retry at multiple freqs are causing one of the
> retries to happen at a bad time? I'm mystified.

This is caused by Anton Vorontsov's patchset here:
   http://lkml.org/lkml/2010/7/14/127

I reported the same symptom:
   http://lkml.org/lkml/2010/9/8/435

and suggested that Andrew remove the patchset from -mm while we work out
the bugs.

Thanks,

-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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