iw_cxgb4: gracefully handle unknown CQE status errors

c4iw_poll_cq_on() shouldn't fail the poll operation just because
the CQE status is unknown.  Rather, it should map this to the
"fatal error" status and log the anomaly.
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/hw/cxgb4/cq.c

@@ -814,7 +814,7 @@ static int c4iw_poll_cq_one(struct c4iw_cq *chp, struct ib_wc *wc)
 			printk(KERN_ERR MOD
 			       "Unexpected cqe_status 0x%x for QPID=0x%0x\n",
 			       CQE_STATUS(&cqe), CQE_QPID(&cqe));
-			ret = -EINVAL;
+			wc->status = IB_WC_FATAL_ERR;
 		}
 	}
 out: