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The current drivers return errors from this calldown wrapped in an ERR_PTR(). The rdmavt code incorrectly tests for NULL. The code is fixed to use IS_ERR() and change ret according to the driver return value. Cc: Stable <stable@vger.kernel.org> # 4.6+ Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>