1 diff --git a/libusb/os/darwin_usb.c b/libusb/os/darwin_usb.c 2 index b0ee5b2..fe40899 100644 3 --- a/libusb/os/darwin_usb.c 4 +++ b/libusb/os/darwin_usb.c 5 @@ -1449,8 +1449,14 @@ static int submit_bulk_transfer(struct usbi_transfer *itransfer) { 6 7 cInterface = &priv->interfaces[iface]; 8 9 - (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number, 10 - &transferType, &maxPacketSize, &interval); 11 + ret = (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number, 12 + &transferType, &maxPacketSize, &interval); 13 + 14 + if (ret) { 15 + usbi_err (TRANSFER_CTX (transfer), "bulk transfer failed (dir = %s): %s (code = 0x%08x)", IS_XFERIN(transfer) ? "In" : "Out", 16 + darwin_error_str(ret), ret); 17 + return darwin_to_libusb (ret); 18 + } 19 20 if (0 != (transfer->length % maxPacketSize)) { 21 /* do not need a zero packet */ 22 23
