IB/hfi1: Check xchg returned value for queuing link down entry
Check xchg returned value for queuing link down entry to guarantee proper atomic value reads. Fixes: 626c077c ("IB/hfi1: Prevent link down request double queuing") Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: NSebastian Sanchez <sebastian.sanchez@intel.com> Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: NDoug Ledford <dledford@redhat.com>
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