From: dingtianhong <dingtianhong@huawei.com>
Date: Wed, 10 Jul 2013 04:04:02 +0000 (+0800)
Subject: ifb: fix rcu_sched self-detected stalls
X-Git-Tag: v3.11-rc1~5^2~31
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=440d57bc5ff55ec1efb3efc9cbe9420b4bbdfefa;p=pandora-kernel.git

ifb: fix rcu_sched self-detected stalls

According to the commit 16b0dc29c1af9df341428f4c49ada4f626258082
(dummy: fix rcu_sched self-detected stalls)

Eric Dumazet fix the problem in dummy, but the ifb will occur the
same problem like the dummy modules.

Trying to "modprobe ifb numifbs=30000" triggers :

INFO: rcu_sched self-detected stall on CPU

After this splat, RTNL is locked and reboot is needed.

We must call cond_resched() to avoid this, even holding RTNL.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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