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authorBrian King <brking@linux.vnet.ibm.com>2017-11-17 11:05:45 -0600
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2017-11-21 23:44:53 -0800
commitae0c585d93dfaf923d2c7eb44b2c3ab92854ea9b (patch)
treef9e5b6b7a2008ddd361b9f9fb7eb67aa01c18bf5 /drivers
parent52c6912fde0133981ee50ba08808f257829c4c93 (diff)
ixgbevf: Use smp_rmb rather than read_barrier_depends
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. Cc: stable <stable@vger.kernel.org> 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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index feed11bc9ddf..1f4a69134ade 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -326,7 +326,7 @@ 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)))

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