tree bb1a8ee20453e511a0ea262d153a978cd2e5bb5a
parent 1e1f9ca546556e508d021545861f6b5fc75a95fe
author Brian King <brking@linux.vnet.ibm.com> 1510938347 -0600
committer Jeff Kirsher <jeffrey.t.kirsher@intel.com> 1511336844 -0800

igb: 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 igb 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: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>