RDMA/siw: Cleanup siw_accept

With the initialization of rv and the two added label, we can
simplifiy code a bit.
Acked-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20231113115726.12762-13-guoqing.jiang@linux.devSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/sw/siw/siw_cm.c

@@ -1558,7 +1558,7 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 	struct siw_cep *cep = (struct siw_cep *)id->provider_data;
 	struct siw_qp *qp;
 	struct siw_qp_attrs qp_attrs;
-	int rv, max_priv_data = MPA_MAX_PRIVDATA;
+	int rv = -EINVAL, max_priv_data = MPA_MAX_PRIVDATA;
 	bool wait_for_peer_rts = false;
 
 	siw_cep_set_inuse(cep);
@@ -1574,24 +1574,17 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 
 	if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
 		siw_dbg_cep(cep, "out of state\n");
-
-		siw_cep_set_free_and_put(cep);
-
-		return -ECONNRESET;
+		rv = -ECONNRESET;
+		goto free_cep;
 	}
 	qp = siw_qp_id2obj(sdev, params->qpn);
 	if (!qp) {
 		WARN(1, "[QP %d] does not exist\n", params->qpn);
-		siw_cep_set_free_and_put(cep);
-
-		return -EINVAL;
+		goto free_cep;
 	}
 	down_write(&qp->state_lock);
-	if (qp->attrs.state > SIW_QP_STATE_RTR) {
-		rv = -EINVAL;
-		up_write(&qp->state_lock);
-		goto error;
-	}
+	if (qp->attrs.state > SIW_QP_STATE_RTR)
+		goto error_unlock;
 	siw_dbg_cep(cep, "[QP %d]\n", params->qpn);
 
 	if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) {
@@ -1605,9 +1598,7 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 			"[QP %u]: ord %d (max %d), ird %d (max %d)\n",
 			qp_id(qp), params->ord, sdev->attrs.max_ord,
 			params->ird, sdev->attrs.max_ird);
-		rv = -EINVAL;
-		up_write(&qp->state_lock);
-		goto error;
+		goto error_unlock;
 	}
 	if (cep->enhanced_rdma_conn_est)
 		max_priv_data -= sizeof(struct mpa_v2_data);
@@ -1617,9 +1608,7 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 			cep,
 			"[QP %u]: private data length: %d (max %d)\n",
 			qp_id(qp), params->private_data_len, max_priv_data);
-		rv = -EINVAL;
-		up_write(&qp->state_lock);
-		goto error;
+		goto error_unlock;
 	}
 	if (cep->enhanced_rdma_conn_est) {
 		if (params->ord > cep->ord) {
@@ -1628,9 +1617,7 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 			} else {
 				cep->ird = params->ird;
 				cep->ord = params->ord;
-				rv = -EINVAL;
-				up_write(&qp->state_lock);
-				goto error;
+				goto error_unlock;
 			}
 		}
 		if (params->ird < cep->ird) {
@@ -1639,8 +1626,7 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 				params->ird = cep->ird;
 			else {
 				rv = -ENOMEM;
-				up_write(&qp->state_lock);
-				goto error;
+				goto error_unlock;
 			}
 		}
 		if (cep->mpa.v2_ctrl.ord &
@@ -1687,7 +1673,6 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 				   SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD |
 				   SIW_QP_ATTR_MPA);
 	up_write(&qp->state_lock);
-
 	if (rv)
 		goto error;
 
@@ -1710,6 +1695,9 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 	siw_cep_set_free(cep);
 
 	return 0;
+
+error_unlock:
+	up_write(&qp->state_lock);
 error:
 	siw_socket_disassoc(cep->sock);
 	sock_release(cep->sock);
@@ -1724,9 +1712,8 @@ int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
 	}
 	cep->qp = NULL;
 	siw_qp_put(qp);
-
+free_cep:
 	siw_cep_set_free_and_put(cep);
-
 	return rv;
 }