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

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Message-ID: <5331FA9E.20506@oracle.com>
Date:	Tue, 25 Mar 2014 17:52:30 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>, Tejun Heo <tj@...nel.org>
CC:	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 02/24/2014 06:04 AM, Alessandro Zummo wrote:
> On Sat, 22 Feb 2014 15:52:17 -0500
> Tejun Heo <tj@...nel.org> wrote:
>
>> The problem is rtc_device_unregister().  It grabs rtc->ops_lock and
>> then tries to remove the sysfs files.  Some of those sysfs file
>> implementations acquire rtc->ops_lock, so it of course can lead to
>> deadlocks.  One can't try to delete a sysfs file which acquires a lock
>> while holding the same lock.
>
>   Pretty interesting indeed. One option would be to remove
>   the sys files before acquiring the lock. But I wonder
>   if this could lead to other issues.
>

Ping? Seems this thing got lost.


Thanks,
Sasha
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