diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index fd192104fd8d..c66d8bf40585 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -496,22 +496,11 @@ static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 	return id_priv->id.route.addr.src_addr.ss_family;
 }
 
-static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
+static int cma_set_default_qkey(struct rdma_id_private *id_priv)
 {
 	struct ib_sa_mcmember_rec rec;
 	int ret = 0;
 
-	if (id_priv->qkey) {
-		if (qkey && id_priv->qkey != qkey)
-			return -EINVAL;
-		return 0;
-	}
-
-	if (qkey) {
-		id_priv->qkey = qkey;
-		return 0;
-	}
-
 	switch (id_priv->id.ps) {
 	case RDMA_PS_UDP:
 	case RDMA_PS_IB:
@@ -531,6 +520,16 @@ static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
 	return ret;
 }
 
+static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
+{
+	if (!qkey ||
+	    (id_priv->qkey && (id_priv->qkey != qkey)))
+		return -EINVAL;
+
+	id_priv->qkey = qkey;
+	return 0;
+}
+
 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
 {
 	dev_addr->dev_type = ARPHRD_INFINIBAND;
@@ -1099,7 +1098,7 @@ static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 	*qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 
 	if (id_priv->id.qp_type == IB_QPT_UD) {
-		ret = cma_set_qkey(id_priv, 0);
+		ret = cma_set_default_qkey(id_priv);
 		if (ret)
 			return ret;
 
@@ -4373,7 +4372,10 @@ static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
 	memset(&rep, 0, sizeof rep);
 	rep.status = status;
 	if (status == IB_SIDR_SUCCESS) {
-		ret = cma_set_qkey(id_priv, qkey);
+		if (qkey)
+			ret = cma_set_qkey(id_priv, qkey);
+		else
+			ret = cma_set_default_qkey(id_priv);
 		if (ret)
 			return ret;
 		rep.qp_num = id_priv->qp_num;
@@ -4578,9 +4580,7 @@ static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
 	enum ib_gid_type gid_type;
 	struct net_device *ndev;
 
-	if (!status)
-		status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
-	else
+	if (status)
 		pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
 				     status);
 
@@ -4608,7 +4608,7 @@ static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
 	}
 
 	event->param.ud.qp_num = 0xFFFFFF;
-	event->param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
+	event->param.ud.qkey = id_priv->qkey;
 
 out:
 	if (ndev)
@@ -4627,8 +4627,11 @@ static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
 	    READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
 		goto out;
 
-	cma_make_mc_event(status, id_priv, multicast, &event, mc);
-	ret = cma_cm_event_handler(id_priv, &event);
+	ret = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
+	if (!ret) {
+		cma_make_mc_event(status, id_priv, multicast, &event, mc);
+		ret = cma_cm_event_handler(id_priv, &event);
+	}
 	rdma_destroy_ah_attr(&event.param.ud.ah_attr);
 	WARN_ON(ret);
 
@@ -4681,9 +4684,11 @@ static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
 	if (ret)
 		return ret;
 
-	ret = cma_set_qkey(id_priv, 0);
-	if (ret)
-		return ret;
+	if (!id_priv->qkey) {
+		ret = cma_set_default_qkey(id_priv);
+		if (ret)
+			return ret;
+	}
 
 	cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
 	rec.qkey = cpu_to_be32(id_priv->qkey);
@@ -4760,9 +4765,6 @@ static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
 	cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
 
 	ib.rec.pkey = cpu_to_be16(0xffff);
-	if (id_priv->id.ps == RDMA_PS_UDP)
-		ib.rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
-
 	if (dev_addr->bound_dev_if)
 		ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
 	if (!ndev)
@@ -4788,6 +4790,9 @@ static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
 	if (err || !ib.rec.mtu)
 		return err ?: -EINVAL;
 
+	if (!id_priv->qkey)
+		cma_set_default_qkey(id_priv);
+
 	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
 		    &ib.rec.port_gid);
 	INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
@@ -4813,6 +4818,9 @@ int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
 			    READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
 		return -EINVAL;
 
+	if (id_priv->id.qp_type != IB_QPT_UD)
+		return -EINVAL;
+
 	mc = kzalloc(sizeof(*mc), GFP_KERNEL);
 	if (!mc)
 		return -ENOMEM;