xen: netfront: hold RTNL when updating features.
Konrad reports: [ 0.930811] RTNL: assertion failed at /home/konrad/ssd/linux/net/core/dev.c (5258) [ 0.930821] Pid: 22, comm: xenwatch Not tainted 2.6.39-05193-gd762f43 #1 [ 0.930825] Call Trace: [ 0.930834] [<ffffffff8143bd0e>] __netdev_update_features+0xae/0xe0 [ 0.930840] [<ffffffff8143dd41>] netdev_update_features+0x11/0x30 [ 0.930847] [<ffffffffa0037105>] netback_changed+0x4e5/0x800 [xen_netfront] [ 0.930854] [<ffffffff8132a838>] xenbus_otherend_changed+0xa8/0xb0 [ 0.930860] [<ffffffff8157ca99>] ? _raw_spin_unlock_irqrestore+0x19/0x20 [ 0.930866] [<ffffffff8132adfe>] backend_changed+0xe/0x10 [ 0.930871] [<ffffffff8132875a>] xenwatch_thread+0xba/0x180 [ 0.930876] [<ffffffff810a8ba0>] ? wake_up_bit+0x40/0x40 [ 0.930881] [<ffffffff813286a0>] ? split+0xf0/0xf0 [ 0.930886] [<ffffffff810a8646>] kthread+0x96/0xa0 [ 0.930891] [<ffffffff815855a4>] kernel_thread_helper+0x4/0x10 [ 0.930896] [<ffffffff815846b3>] ? int_ret_from_sys_call+0x7/0x1b [ 0.930901] [<ffffffff8157cf61>] ? retint_restore_args+0x5/0x6 [ 0.930906] [<ffffffff815855a0>] ? gs_change+0x13/0x13 This update happens in xenbus watch callback context and hence does not already hold the rtnl. Take the lock as necessary. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1581,7 +1581,9 @@ static int xennet_connect(struct net_device *dev)
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if (err)
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return err;
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rtnl_lock();
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netdev_update_features(dev);
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rtnl_unlock();
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spin_lock_bh(&np->rx_lock);
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spin_lock_irq(&np->tx_lock);
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