[161/197] e1000e: stop cleaning when we reach tx_ring->next_to_use

[Greg KH]

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Terry Loftin <terry.loftin@xxxxxx>

commit dac876193cd79ced36d0462749ea47c05844fb49 upstream.

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@xxxxxx>
Acked-by: Bruce Allan <bruce.w.allan@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Matthew Burgess <matthew@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/e1000e/netdev.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -665,6 +665,8 @@ static bool e1000_clean_tx_irq(struct e1
 				i = 0;
 		}
 
+		if (i == tx_ring->next_to_use)
+			break;
 		eop = tx_ring->buffer_info[i].next_to_watch;
 		eop_desc = E1000_TX_DESC(*tx_ring, eop);
 	}


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