From: Eric Dumazet <edumazet@google.com>
Date: Sun, 15 Dec 2013 18:53:46 +0000 (-0800)
Subject: udp: ipv4: do not use sk_dst_lock from softirq context
X-Git-Tag: v3.13-rc5~30^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e47eb5dfb296bf217e9ebee7b2f07486670b9c1b;p=pandora-kernel.git

udp: ipv4: do not use sk_dst_lock from softirq context

Using sk_dst_lock from softirq context is not supported right now.

Instead of adding BH protection everywhere,
udp_sk_rx_dst_set() can instead use xchg(), as suggested
by David.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Fixes: 975022310233 ("udp: ipv4: must add synchronization in udp_sk_rx_dst_set()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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