[PATCH 4.9 072/138] igb: Use smp_rmb rather than read_barrier_depends

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Brian King commit c4cb99185b4cc96c0a1c70104dc21ae14d7e7f28 upstream. The original issue being fixed in this patch was seen with the ixgbe driver, but the same issue

[PATCH 4.9 072/138] igb: Use smp_rmb rather than read_barrier_depends

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Brian King commit c4cb99185b4cc96c0a1c70104dc21ae14d7e7f28 upstream. The original issue being fixed in this patch was seen with the ixgbe driver, but the same issue exists with igb as well, as