From: stephen hemminger <stephen@networkplumber.org>
Date: Mon, 17 Jun 2013 19:09:57 +0000 (-0700)
Subject: vxlan: fix race between flush and incoming learning
X-Git-Tag: v3.10~13^2~47
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3bf74b1aecdce719f1445200d5db7dfee2297bba;p=pandora-kernel.git

vxlan: fix race between flush and incoming learning

It is possible for a packet to arrive during vxlan_stop(), and
have a dynamic entry created. Close this by checking if device
is up.

 CPU1                             CPU2
vxlan_stop
  vxlan_flush
     hash_lock acquired
                                  vxlan_encap_recv
                                     vxlan_snoop
                                        waiting for hash_lock
     hash_lock relased
  vxlan_flush done
                                        hash_lock acquired
                                        vxlan_fdb_create

This is a day-one bug in vxlan goes back to 3.7.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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