RDMA/bnxt_re: synchronize poll_cq and req_notify_cq verbs

Synchronize poll_cq and req_notify_cq verbs using cq_lock,
instead of the lower level qplib->hwq.lock.
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -2996,8 +2996,10 @@ int bnxt_re_req_notify_cq(struct ib_cq *ib_cq,
 			  enum ib_cq_notify_flags ib_cqn_flags)
 {
 	struct bnxt_re_cq *cq = container_of(ib_cq, struct bnxt_re_cq, ib_cq);
-	int type = 0;
+	int type = 0, rc = 0;
+	unsigned long flags;
 
+	spin_lock_irqsave(&cq->cq_lock, flags);
 	/* Trigger on the very next completion */
 	if (ib_cqn_flags & IB_CQ_NEXT_COMP)
 		type = DBR_DBR_TYPE_CQ_ARMALL;
@@ -3007,12 +3009,15 @@ int bnxt_re_req_notify_cq(struct ib_cq *ib_cq,
 
 	/* Poll to see if there are missed events */
 	if ((ib_cqn_flags & IB_CQ_REPORT_MISSED_EVENTS) &&
-	    !(bnxt_qplib_is_cq_empty(&cq->qplib_cq)))
-		return 1;
-
+	    !(bnxt_qplib_is_cq_empty(&cq->qplib_cq))) {
+		rc = 1;
+		goto exit;
+	}
 	bnxt_qplib_req_notify_cq(&cq->qplib_cq, type);
 
-	return 0;
+exit:
+	spin_unlock_irqrestore(&cq->cq_lock, flags);
+	return rc;
 }
 
 /* Memory Regions */