kingst-la2016: stop acquisition when USB device was lost

Check for the condition when the USB device has gone away in the middle
of getting communicated to. Terminate acquisition in that case, instead
of trying to continue.

diff --git a/src/hardware/kingst-la2016/protocol.c b/src/hardware/kingst-la2016/protocol.c
index 8f08337ad7fa570663d35485c63b23272c7d5350..596b085c49b4d04c6de45d19a320470ab335be40 100644 (file)
--- a/src/hardware/kingst-la2016/protocol.c
+++ b/src/hardware/kingst-la2016/protocol.c
@@ -1515,15 +1515,22 @@ static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 {
        struct sr_dev_inst *sdi;
        struct dev_context *devc;
-       gboolean was_cancelled;
+       gboolean was_cancelled, device_gone;
        int ret;
 
        sdi = transfer->user_data;
        devc = sdi->priv;
 
        was_cancelled = transfer->status == LIBUSB_TRANSFER_CANCELLED;
+       device_gone = transfer->status == LIBUSB_TRANSFER_NO_DEVICE;
        sr_dbg("receive_transfer(): status %s received %d bytes.",
                libusb_error_name(transfer->status), transfer->actual_length);
+       if (device_gone) {
+               sr_warn("Lost communication to USB device.");
+               devc->download_finished = TRUE;
+               return;
+       }
+
        /*
         * Implementation detail: A USB transfer timeout is not fatal
         * here. We just process whatever was received, empty input is