e1000e: stop cleaning when we reach tx_ring->next_to_use
Tx ring buffers after tx_ring->next_to_use are volatile and could change, possibly causing a crash. Stop cleaning when we hit tx_ring->next_to_use. Signed-off-by: Terry Loftin <terry.loftin@hp.com> Acked-by: Bruce Allan <bruce.w.allan@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -661,6 +661,8 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter)
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i = 0;
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}
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if (i == tx_ring->next_to_use)
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break;
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eop = tx_ring->buffer_info[i].next_to_watch;
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eop_desc = E1000_TX_DESC(*tx_ring, eop);
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}
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