ixgbe: add write flush when configuring CS4223/7
Make sure the writes are processed immediately. Without the flush it is possible for operations on one port to spill over the other as the resource is shared. Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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