Panda: add check for connected in usb_read (#19957)

old-commit-hash: c723bbd6be
4 years ago · 53957eec3f
parent 099a5a21e2
commit 53957eec3f
1 changed files with 4 additions and 0 deletions
--- a/selfdrive/boardd/panda.cc
+++ b/selfdrive/boardd/panda.cc
@ -118,6 +118,10 @@ int Panda::usb_read(uint8_t bRequest, uint16_t wValue, uint16_t wIndex, unsigned
  int err;
  const uint8_t bmRequestType = LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE;

+  if (!connected){
+    return LIBUSB_ERROR_NO_DEVICE;
+  }
+
  std::lock_guard lk(usb_lock);
  do {
    err = libusb_control_transfer(dev_handle, bmRequestType, bRequest, wValue, wIndex, data, wLength, timeout);