Re: [PATCH 12/14 UPDATED] sysfs: implement sysfs_dirent active reference and immediate disconnect

[Tejun Heo <htejun@gmail.com>]

Hello,

Cornelia Huck wrote:
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.21-rc6-ge666c753-dirty #54
> -------------------------------------------------------
> kslowcrw/64 is trying to acquire lock:
>  (&sch->reg_mutex){--..}, at: [<00000000004233b2>] mutex_lock+0x3e/0x4c
> 
> but task is already holding lock:
>  (&sd->s_active){----}, at: [<0000000000209578>] remove_dir+0xec/0x144
> 
> which lock already depends on the new lock.

This is probably because s_active has different write locked and
unlocked by different threads but it doesn't tell lockdep about it.
I'll read lockdep docs and update it.

Thanks for testing.

-- 
tejun
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