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ixgbevf: Use smp_rmb rather than read_barrier_depends

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commit ae0c585d93 upstream.

The original issue being fixed in this patch was seen with the ixgbe
driver, but the same issue exists with ixgbevf as well, as the code is
very similar. read_barrier_depends is not sufficient to ensure
loads following it are not speculatively loaded out of order
by the CPU, which can result in stale data being loaded, causing
potential system crashes.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Brian King
2017-11-17 11:05:45 -06:00
committed by Greg Kroah-Hartman
parent 2f7de4d5f5
commit a8e699dfca
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
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@@ -312,7 +312,7 @@ static bool ixgbevf_clean_tx_irq(struct ixgbevf_q_vector *q_vector,
break;
/* prevent any other reads prior to eop_desc */
read_barrier_depends();
smp_rmb();
/* if DD is not set pending work has not been completed */
if (!(eop_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)))