linux-kernel - Re: [PATCH 0/1] debugfs: debugfs_remove_recursive() must not rely on list_empty(d

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Message-ID: <20130726151432.GD19472@redhat.com>
Date:	Fri, 26 Jul 2013 17:14:32 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexander Z Lam <azl@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	David Sharp <dhsharp@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] debugfs: debugfs_remove_recursive() must not rely
	on list_empty(d_subdirs)

Argh, sorry for noise.

Please ignore the extra email with the wrong subject.

On 07/26, Oleg Nesterov wrote:
>
> debugfs_remove_recursive() is wrong,
> 
> 1. it wrongly assumes that !list_empty(d_subdirs) means that this
>    dir should be removed.
> 
>    This is not that bad by itself, but:
> 
> 2. if d_subdirs does not becomes empty after __debugfs_remove()
>    it gives up and silently fails, it doesn't even try to remove
>    other entries.
> 
>    However ->d_subdirs can be non-empty because it still has the
>    already deleted !debugfs_positive() entries.
> 

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