From: Timo Teräs <timo.teras@iki.fi>
Date: Mon, 27 May 2013 20:46:32 +0000 (+0000)
Subject: ipv4: rate limit updating of next hop exceptions with same pmtu
X-Git-Tag: v3.11-rc1~16^2~216
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f016229e303c294afac721de4cd4427e634950ea;p=pandora-kernel.git

ipv4: rate limit updating of next hop exceptions with same pmtu

The tunnel devices call update_pmtu for each packet sent, this causes
contention on the fnhe_lock. Ignore the pmtu update if pmtu is not
actually changed, and there is still plenty of time before the entry
expires.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
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