linux-kernel - Re: kernfs/rtc: circular dependency between kernfs and ops

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Message-ID: <53393AE4.505@metafoo.de>
Date:	Mon, 31 Mar 2014 11:52:36 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Alessandro Zummo <a.zummo@...ertech.it>
CC:	Sasha Levin <sasha.levin@...cle.com>, Tejun Heo <tj@...nel.org>,
	Greg KH <greg@...ah.com>, rtc-linux@...glegroups.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: kernfs/rtc: circular dependency between kernfs and ops_lock

On 03/31/2014 11:46 AM, Alessandro Zummo wrote:
> On Sun, 30 Mar 2014 12:04:16 -0400
> Sasha Levin <sasha.levin@...cle.com> wrote:
>
>>> Look good, thanks!
>>
>> Or not...
>>
>> Hit it again during overnight fuzzing:
>>
>
>   I think this is a different bug, please try this.

It's the same bug, device_unregister(&rtc->dev) will try to unregister all 
sysfs files attached to the device and that function is still called with 
the rtc mutex held.

- Lars

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