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authorBrian King <brking@linux.vnet.ibm.com>2017-11-17 11:05:47 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-30 08:39:08 +0000
commit34b6b00ded9f08f06f5a4e76f01d8fcec53f1ac3 (patch)
tree7a0d2fe536ba46f34b07533c17f801ead1357bc2 /drivers
parente45d7db989db5722fa31541fa8b008ca00385f06 (diff)
igb: Use smp_rmb rather than read_barrier_depends
commit c4cb99185b4cc96c0a1c70104dc21ae14d7e7f28 upstream. The original issue being fixed in this patch was seen with the ixgbe driver, but the same issue exists with igb 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: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/intel/igb/igb_main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index c6c2562d9df3..16839600fb78 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -6660,7 +6660,7 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector, int napi_budget)
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(E1000_TXD_STAT_DD)))