initial transfer failed in open() shouldn't cause the driver open to fail.

1 files changed, 6 insertions, 3 deletions

diff --git a/src/class/vendor/vendor_device.c b/src/class/vendor/vendor_device.c
index 98eafe44c..8f2dfef32 100644
--- a/src/class/vendor/vendor_device.c
+++ b/src/class/vendor/vendor_device.c
@@ -186,12 +186,15 @@ uint16_t vendord_open(uint8_t rhport, tusb_desc_interface_t const * itf_desc, ui
   TU_ASSERT(usbd_open_edpt_pair(rhport, tu_desc_next(itf_desc), 2, TUSB_XFER_BULK, &p_vendor->ep_out, &p_vendor->ep_in), 0);
 
   p_vendor->itf_num = itf_desc->bInterfaceNumber;
-  uint16_t const drv_len = sizeof(tusb_desc_interface_t) + itf_desc->bNumEndpoints*sizeof(tusb_desc_endpoint_t);
 
   // Prepare for incoming data
-  TU_ASSERT(usbd_edpt_xfer(rhport, p_vendor->ep_out, p_vendor->epout_buf, sizeof(p_vendor->epout_buf)), drv_len);
+  if ( !usbd_edpt_xfer(rhport, p_vendor->ep_out, p_vendor->epout_buf, sizeof(p_vendor->epout_buf)) )
+  {
+    TU_LOG1_FAILED();
+    TU_BREAKPOINT();
+  }
 
-  return drv_len;
+  return sizeof(tusb_desc_interface_t) + itf_desc->bNumEndpoints*sizeof(tusb_desc_endpoint_t);
 }
 
 bool vendord_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes)