netdev - Re: [PATCH] vxlan: move listen socket creation from workqueue to vxlan

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Date:	Fri, 21 Nov 2014 17:11:31 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mleitner@...hat.com
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	pshelar@...ira.com
Subject: Re: [PATCH] vxlan: move listen socket creation from workqueue to
 vxlan_open

From: Marcelo Ricardo Leitner <mleitner@...hat.com>
Date: Thu, 20 Nov 2014 10:33:32 -0200

> But this doesn't apply to vxlan_open() scenario. We can unlock/lock
> in there safely and, with that, we can return a better error value
> to the user if that's the case.

This is not safe.

Now nothing prevents another parallel open of this vxlan device to
occur while you dropped the RTNL semaphore.
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