iwlwifi: use rmb/wmb to protect indirect mmio operation
This patch protects iwlwifi indirect mmio operations with rmb() and wmb(). It makes sure CPU reordering won't affect our indirect mmio access. Signed-off-by: NZhu Yi <yi.zhu@intel.com> Signed-off-by: NReinette Chatre <reinette.chatre@intel.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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