netdev - Re: [PATCH net-next v4] rtnetlink: delay RTM_DELLINK notification until after ndo

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Message-Id: <20141209.133719.510437323986645419.davem@davemloft.net>
Date:	Tue, 09 Dec 2014 13:37:19 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	maheshb@...gle.com
Cc:	netdev@...r.kernel.org, edumazet@...gle.com,
	roopa@...ulusnetworks.com, makita.toshiaki@....ntt.co.jp
Subject: Re: [PATCH net-next v4] rtnetlink: delay RTM_DELLINK notification
 until after ndo_uninit()

From: Mahesh Bandewar <maheshb@...gle.com>
Date: Wed,  3 Dec 2014 13:46:24 -0800

> The commit 56bfa7ee7c ("unregister_netdevice : move RTM_DELLINK to
> until after ndo_uninit") tried to do this ealier but while doing so
> it created a problem. Unfortunately the delayed rtmsg_ifinfo() also
> delayed call to fill_info(). So this translated into asking driver
> to remove private state and then query it's private state. This
> could have catastropic consequences.
> 
> This change breaks the rtmsg_ifinfo() into two parts - one takes the
> precise snapshot of the device by called fill_info() before calling
> the ndo_uninit() and the second part sends the notification using
> collected snapshot.
> 
> It was brought to notice when last link is deleted from an ipvlan device
> when it has free-ed the port and the subsequent .fill_info() call is
> trying to get the info from the port.
...
> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>
> Reported-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Roopa Prabhu <roopa@...ulusnetworks.com>
> Cc: David S. Miller <davem@...emloft.net>

Applied.
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