linux-kernel - Re: [PATCH net-next] tuntap: attach queue 0 before registering netdevice

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Message-Id: <20121203.134918.1505727312476469482.davem@davemloft.net>
Date:	Mon, 03 Dec 2012 13:49:18 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	jslaby@...e.cz
Subject: Re: [PATCH net-next] tuntap: attach queue 0 before registering
 netdevice

From: Jason Wang <jasowang@...hat.com>
Date: Mon,  3 Dec 2012 11:19:45 +0800

> We attach queue 0 after registering netdevice currently. This leads to call
> netif_set_real_num_{tx|rx}_queues() after registering the netdevice. Since we
> allow tun/tap has a maximum of 1024 queues, this may lead a huge number of
> uevents to be injected to userspace since we create 2048 kobjects and then
> remove 2046. Solve this problem by attaching queue 0 and set the real number of
> queues before registering netdevice.
> 
> Reported-by: Jiri Slaby <jslaby@...e.cz>
> Tested-by: Jiri Slaby <jslaby@...e.cz>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied, thanks Jason.
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