Blackfin Serial Driver: Remove useless stop

Signed-off-by: NSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/serial/bfin_5xx.c

@@ -320,9 +320,6 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(&uart->port);
-
-	if (uart_circ_empty(xmit))
-		bfin_serial_stop_tx(&uart->port);
 }
 
 static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)