Commit 7b8edcc6 authored by Brian King's avatar Brian King Committed by Jeff Kirsher

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: default avatarBrian King <brking@linux.vnet.ibm.com>
Acked-by: default avatarJesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent c4cb9918
...@@ -1231,7 +1231,7 @@ static bool fm10k_clean_tx_irq(struct fm10k_q_vector *q_vector, ...@@ -1231,7 +1231,7 @@ static bool fm10k_clean_tx_irq(struct fm10k_q_vector *q_vector,
break; break;
/* prevent any other reads prior to eop_desc */ /* 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 DD is not set pending work has not been completed */
if (!(eop_desc->flags & FM10K_TXD_FLAG_DONE)) if (!(eop_desc->flags & FM10K_TXD_FLAG_DONE))
......
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