--- zzzz-none-000/linux-3.10.107/drivers/usb/wusbcore/reservation.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/usb/wusbcore/reservation.c	2021-02-04 17:41:59.000000000 +0000
@@ -49,13 +49,13 @@
 	struct wusbhc *wusbhc = rsv->pal_priv;
 	struct device *dev = wusbhc->dev;
 	struct uwb_mas_bm mas;
-	char buf[72];
 
+	dev_dbg(dev, "%s: state = %d\n", __func__, rsv->state);
 	switch (rsv->state) {
 	case UWB_RSV_STATE_O_ESTABLISHED:
 		uwb_rsv_get_usable_mas(rsv, &mas);
-		bitmap_scnprintf(buf, sizeof(buf), mas.bm, UWB_NUM_MAS);
-		dev_dbg(dev, "established reservation: %s\n", buf);
+		dev_dbg(dev, "established reservation: %*pb\n",
+			UWB_NUM_MAS, mas.bm);
 		wusbhc_bwa_set(wusbhc, rsv->stream, &mas);
 		break;
 	case UWB_RSV_STATE_NONE:
@@ -80,6 +80,9 @@
 	struct uwb_dev_addr bcid;
 	int ret;
 
+	if (rc == NULL)
+		return -ENODEV;
+
 	rsv = uwb_rsv_create(rc, wusbhc_rsv_complete_cb, wusbhc);
 	if (rsv == NULL)
 		return -ENOMEM;