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ixgbe: Replace rmb in Tx cleanup with read_barrier_depends 

The rmb in the Tx cleanup path is a much stronger barrier than we really need.
All that is really needed is a read_barrier_depends since the location of the
EOP descriptor is dependent on the eop_desc value.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2013-01-08 07:00:58 +00:00 committed by Jeff Kirsher
parent 434c5e3954
commit 7e63bf4901
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -838,7 +838,7 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_q_vector *q_vector,
break;
/* prevent any other reads prior to eop_desc */
rmb();
read_barrier_depends();
/* if DD is not set pending work has not been completed */
if (!(eop_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)))