netdev - Re: [PATCH v3] netfilter: Xtables: idletimer target implementation

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Date:	Wed, 9 Jun 2010 23:05:28 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Luciano Coelho <luciano.coelho@...ia.com>
cc:	ext Patrick McHardy <kaber@...sh.net>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Timo Teras <timo.teras@....fi>
Subject: Re: [PATCH v3] netfilter: Xtables: idletimer target implementation

On Wednesday 2010-06-09 20:42, Luciano Coelho wrote:
>
>> I'll move the sysfs file creation to outside that function so I can keep
>> the lock until after the timer is added to the list.  Thanks for
>> clarifying!
>
>Hmmm... after struggling with this for a while, I think it's not really
>possible to simply create the sysfs file outside of the lock, because if
>the sysfs creation fails, we will again risk a race condition.

Well if sysfs_add can return an error code when a file already
exists (instead of adding it again), it's much easier. Try checking.
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