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-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=440d57bc5ff55ec1efb3efc9cbe9420b4bbdfefa;p=openwrt%2Fstaging%2Fblogic.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>
---

diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index dc9f6a45515d..a11f7a45cb5f 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -292,8 +292,10 @@ static int __init ifb_init_module(void)
 	rtnl_lock();
 	err = __rtnl_link_register(&ifb_link_ops);
 
-	for (i = 0; i < numifbs && !err; i++)
+	for (i = 0; i < numifbs && !err; i++) {
 		err = ifb_init_one(i);
+		cond_resched();
+	}
 	if (err)
 		__rtnl_link_unregister(&ifb_link_ops);
 	rtnl_unlock();