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authorBrian King <brking@linux.vnet.ibm.com>2017-11-17 11:05:48 -0600
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2017-11-21 23:48:39 -0800
commit7b8edcc685b5e2c3c37aa13dc50a88e84a5bfef8 (patch)
tree1797b5b7fbca276e4c131b1a5c48b102cdac5f8a /drivers
parentc4cb99185b4cc96c0a1c70104dc21ae14d7e7f28 (diff)
fm10k: 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 fm10k 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> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/intel/fm10k/fm10k_main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_main.c b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
index dbd69310f263..538b42d5c187 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_main.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_main.c
@@ -1231,7 +1231,7 @@ static bool fm10k_clean_tx_irq(struct fm10k_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->flags & FM10K_TXD_FLAG_DONE))

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