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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>
This commit is contained in:
Terry Loftin 2010-04-09 10:29:49 +00:00 committed by David S. Miller
parent d5aa22520d
commit dac876193c
1 changed files with 2 additions and 0 deletions
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2
drivers/net/e1000e/netdev.c
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@ -661,6 +661,8 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter)
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);
}