linux-kernel - Re: [PATCH] netlink: Re-add locking to netlink

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Message-Id: <20141021.213604.498626106621926349.davem@davemloft.net>
Date:	Tue, 21 Oct 2014 21:36:04 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	tgraf@...g.ch
Cc:	davem@...emloft.ne, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH] netlink: Re-add locking to netlink_lookup() and seq
 walker

From: Thomas Graf <tgraf@...g.ch>
Date: Tue, 21 Oct 2014 22:05:38 +0200

> The synchronize_rcu() in netlink_release() introduces unacceptable
> latency. Reintroduce minimal lookup so we can drop the
> synchronize_rcu() until socket destruction has been RCUfied.
> 
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Reported-by: Steinar H. Gunderson <sgunderson@...foot.com>
> Reported-and-tested-by: Heiko Carstens <heiko.carstens@...ibm.com>
> Signed-off-by: Thomas Graf <tgraf@...g.ch>

Applied and queued up for -stable.

Please use an appropriate "Fixes: " tag in the future, this is
especially important for an issue as serious as this one.

Thanks.
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