diff --git a/drivers/net/wireless/zydas/zd1211rw/zd_usb.c b/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
index 966d8ccb0dbc..98102c663434 100644
--- a/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
@@ -1353,6 +1353,14 @@ static int probe(struct usb_interface *intf, const struct usb_device_id *id)
 	struct zd_usb *usb;
 	struct ieee80211_hw *hw = NULL;
 
+	/*
+	 * ZD1211 devices are single-function. Reject secondary interfaces
+	 * to prevent multiple instances from conflicting on hardcoded endpoints
+	 * and triggering recursive locking warnings.
+	 */
+	if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
+		return -ENODEV;
+
 	print_id(udev);
 
 	if (id->driver_info & DEVICE_INSTALLER)