serial: dz: Use uart_xmit_advance()

Take advantage of the new uart_xmit_advance() helper.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20221019091151.6692-2-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c
index 829b452daee9d4b813342484e5c7c8548a953c4e..6b7ed7f2f3cac64fbfd3e87705bd54ea9ae2d525 100644 (file)
--- a/drivers/tty/serial/dz.c
+++ b/drivers/tty/serial/dz.c
@@ -279,9 +279,8 @@ static inline void dz_transmit_chars(struct dz_mux *mux)
         * so we go one char at a time) :-<
         */
        tmp = xmit->buf[xmit->tail];
-       xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
        dz_out(dport, DZ_TDR, tmp);
-       dport->port.icount.tx++;
+       uart_xmit_advance(&dport->port, 1);
 
        if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
                uart_write_wakeup(&dport->port);