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i40evf: Use smp_rmb rather than read_barrier_depends

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commit f72271e2a0ae4277d53c4053f5eed8bb346ba38a upstream.

The original issue being fixed in this patch was seen with the ixgbe
driver, but the same issue exists with i40evf 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 11:05:49 -06:00 committed by Greg Kroah-Hartman
parent bc46257bf4
commit 61cef8f08c
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/i40evf/i40e_txrx.c
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@ -179,7 +179,7 @@ static bool i40e_clean_tx_irq(struct i40e_vsi *vsi,
break;
/* prevent any other reads prior to eop_desc */
read_barrier_depends();
smp_rmb();
i40e_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf);
/* if the descriptor isn't done, no work yet to do */