Symbol: uftdi_wait_tx_drain
usr/src/uts/common/io/usb/clients/usbser/usbftdi/uftdi_dsd.c
1116
if (uftdi_wait_tx_drain(uf, 0) != USB_SUCCESS) {
usr/src/uts/common/io/usb/clients/usbser/usbftdi/uftdi_dsd.c
132
static int uftdi_wait_tx_drain(uftdi_state_t *, int);