From: Thomas Graf <tgraf@suug.ch>
Date: Tue, 21 Oct 2014 20:05:38 +0000 (+0200)
Subject: netlink: Re-add locking to netlink_lookup() and seq walker
X-Git-Tag: omap-for-v3.19/fixes-not-urgent-part1~25^2~53
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78fd1d0ab072;p=pandora-kernel.git

netlink: Re-add locking to netlink_lookup() and seq walker

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@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Reported-by: Steinar H. Gunderson <sgunderson@bigfoot.com>
Reported-and-tested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
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