diff options
| author | Brian King <brking@linux.vnet.ibm.com> | 2017-11-17 11:05:49 -0600 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2017-11-21 23:52:38 -0800 |
| commit | f72271e2a0ae4277d53c4053f5eed8bb346ba38a (patch) | |
| tree | 98e29ef1f7e82d36c8136e34ac0684208062e979 /drivers/net/ethernet/intel/i40evf | |
| parent | 7b8edcc685b5e2c3c37aa13dc50a88e84a5bfef8 (diff) | |
| download | linux-f72271e2a0ae4277d53c4053f5eed8bb346ba38a.tar.bz2 | |
i40evf: 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 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.
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/net/ethernet/intel/i40evf')
| -rw-r--r-- | drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c index fe817e2b6fef..50864f99446d 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -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 */ |