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List: e1000-devel
Subject: Re: [E1000-devel] [WARNING net-next] from ixgbe_configure
From: John Fastabend <john.fastabend () gmail ! com>
Date: 2013-12-30 5:29:37
Message-ID: 52C104C1.6070508 () gmail ! com
[Download RAW message or body]
On 12/29/2013 01:15 PM, Stephen Hemminger wrote:
> Warning with current net-next from ixgbe_configure calling
> netdev_all_upper_get_next_dev_rcu without RCU read lock held.
>
>
> [ 4.717512] r8169 0000:03:00.0 eth0: link down
> [ 4.717581] r8169 0000:03:00.0 eth0: link down
> [ 4.717590] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
> [ 6.722390] r8169 0000:03:00.0 eth0: link up
> [ 6.722428] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> [ 9.833968] ------------[ cut here ]------------
> [ 9.833976] WARNING: CPU: 5 PID: 2173 at net/core/dev.c:4448 \
> netdev_all_upper_get_next_dev_rcu+0x6b/0xa0()
This should be fixed when net is synced with net-next by the
following commit,
author John Fastabend <john.r.fastabend@intel.com>
committer Jeff Kirsher <jeffrey.t.kirsher@intel.com>
commit 85328240c625f322af9f69c7b60e619717101d77
net: allow netdev_all_upper_get_next_dev_rcu with rtnl lock held
It is useful to be able to walk all upper devices when bringing a device
online where the RTNL lock is held. In this case it is safe to walk the
all_adj_list because the RTNL lock is used to protect the write side as
well.
[...]
Thanks,
John
--
John Fastabend Intel Corporation
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