i40e: Use smp_rmb rather than read_barrier_depends

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commit 52c6912fde upstream.

The original issue being fixed in this patch was seen with the ixgbe
driver, but the same issue exists with i40e 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>

...

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Brian King 2017-11-17 11:05:44 -06:00 • committed by Greg Kroah-Hartman

parent bb76fcebb9

commit 5727faafa5

2 changed files with 2 additions and 2 deletions

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2

drivers/net/ethernet/intel/i40e/i40e_main.c

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2

drivers/net/ethernet/intel/i40e/i40e_txrx.c

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