From: Thomas Graf <tgraf@suug.ch>
Date: Fri, 2 Jan 2015 22:00:22 +0000 (+0100)
Subject: netlink: Lockless lookup with RCU grace period in socket release
X-Git-Tag: fixes-v4.0-rc1~150^2~294^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=21e4902aea80ef35afc00ee8d2abdea4f519b7f7;p=pandora-kernel.git

netlink: Lockless lookup with RCU grace period in socket release

Defers the release of the socket reference using call_rcu() to
allow using an RCU read-side protected call to rhashtable_lookup()

This restores behaviour and performance gains as previously
introduced by e341694 ("netlink: Convert netlink_lookup() to use
RCU protected hash table") without the side effect of severely
delayed socket destruction.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
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