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    Subject[PATCH 4.14 158/193] i40evf: Use smp_rmb rather than read_barrier_depends
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Brian King <brking@linux.vnet.ibm.com>

    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>

    ---
    drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- 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 i40
    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 */

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