[PATCH 24/26] serial: timbuart: drop low-latency workaround

Johan Hovold
2021-04-21T09:57:38Z

The timbuart driver has always carried a workaround for the infamous
low_latency behaviour of tty_flip_buffer_push() which required not
holding the port lock when the low_latency flag was set.

Since commit a9c3f68f3cd8 ("tty: Fix low_latency BUG"),
tty_flip_buffer_push() always schedules a work item to push data to the
line discipline and there's no need to keep any low_latency hacks
around.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/tty/serial/timbuart.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c
index 2126e6e6dfd1..08941eabe7b1 100644
--- a/drivers/tty/serial/timbuart.c
+++ b/drivers/tty/serial/timbuart.c
@@ -87,9 +87,7 @@ static void timbuart_rx_chars(struct uart_port *port)
tty_insert_flip_char(tport, ch, TTY_NORMAL);
}

- spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
- spin_lock(&port->lock);

dev_dbg(port->dev, "%s - total read %d bytes\n",
__func__, port->icount.rx);
--
2.26.3