linux-kernel - [PATCH 18/26] serial: rda: drop low-latency workaround

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Message-Id: <20210421095509.3024-19-johan@kernel.org>
Date:   Wed, 21 Apr 2021 11:55:01 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>
Subject: [PATCH 18/26] serial: rda: drop low-latency workaround

The rda driver has always carried an unnecessary workaround for the
infamous low_latency behaviour of tty_flip_buffer_push(), which had
been removed years before the driver was added by commit c10b13325ced
("tty: serial: Add RDA8810PL UART driver").

Specifically, 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@...nel.org>
---
 drivers/tty/serial/rda-uart.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/tty/serial/rda-uart.c b/drivers/tty/serial/rda-uart.c
index 85366e059258..d550d8fa2fab 100644
--- a/drivers/tty/serial/rda-uart.c
+++ b/drivers/tty/serial/rda-uart.c
@@ -398,9 +398,7 @@ static void rda_uart_receive_chars(struct uart_port *port)
 		status = rda_uart_read(port, RDA_UART_STATUS);
 	}

-	spin_unlock(&port->lock);
 	tty_flip_buffer_push(&port->state->port);
-	spin_lock(&port->lock);
 }

 static irqreturn_t rda_interrupt(int irq, void *dev_id)
-- 
2.26.3