e1000_down and tx_timeout worker race cleaning the transmit buffers

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Hi All,

If the e1000_tx_timeout_task were running concurrently with e1000_down, it 
seems that they could both attempt to kfree_skb concurrently when running 
e1000_unmap_and_free_tx_resource.   I googled around to find mention of this 
anywhere with no luck.  Has this been discussed already?

Thanks,
Shaw
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