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ifb: fix rcu_sched self-detected stalls

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According to the commit 16b0dc29c1
(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>
This commit is contained in:
dingtianhong 2013-07-10 12:04:02 +08:00 committed by David S. Miller
parent 45dd95c443
commit 440d57bc5f
1 changed files with 3 additions and 1 deletions
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4
drivers/net/ifb.c
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@ -292,8 +292,10 @@ static int __init ifb_init_module(void)
rtnl_lock(); rtnl_lock();
err = __rtnl_link_register(&ifb_link_ops); 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); err = ifb_init_one(i);
cond_resched();
}
if (err) if (err)
__rtnl_link_unregister(&ifb_link_ops); __rtnl_link_unregister(&ifb_link_ops);
rtnl_unlock(); rtnl_unlock();