[PATCH 5.19 163/207] serial: tegra-tcu: Use uart_xmit_advance(), fixes icount.tx accounting

Greg Kroah-Hartman
2022-09-26T11:59:12Z

From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

commit 1d10cd4da593bc0196a239dcc54dac24b6b0a74e upstream.

Tx'ing does not correctly account Tx'ed characters into icount.tx.
Using uart_xmit_advance() fixes the problem.

Fixes: 2d908b38d409 ("serial: Add Tegra Combined UART driver")
Cc: <stable@vger.kernel.org> # serial: Create uart_xmit_advance()
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220901143934.8850-4-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/tegra-tcu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/serial/tegra-tcu.c
+++ b/drivers/tty/serial/tegra-tcu.c
@@ -101,7 +101,7 @@ static void tegra_tcu_uart_start_tx(stru
break;

tegra_tcu_write(tcu, &xmit->buf[xmit->tail], count);
- xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
+ uart_xmit_advance(port, count);
}

uart_write_wakeup(port);