Re: kernfs/rtc: circular dependency between kernfs and ops_lock

[Sasha Levin]

On 02/24/2014 06:04 AM, Alessandro Zummo wrote:
> On Sat, 22 Feb 2014 15:52:17 -0500
> Tejun Heo <tj@xxxxxxxxxx> 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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