From: Pravin B Shelar <pshelar@nicira.com>
Date: Tue, 24 Sep 2013 17:25:40 +0000 (-0700)
Subject: vxlan: Use RCU apis to access sk_user_data.
X-Git-Tag: v3.12-rc4~30^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=559835ea7292e2f09304d81eda16f4209433245e;p=pandora-kernel.git

vxlan: Use RCU apis to access sk_user_data.

Use of RCU api makes vxlan code easier to understand.  It also
fixes bug due to missing ACCESS_ONCE() on sk_user_data dereference.
In rare case without ACCESS_ONCE() compiler might omit vs on
sk_user_data dereference.
Compiler can use vs as alias for sk->sk_user_data, resulting in
multiple sk_user_data dereference in rcu read context which
could change.

CC: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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