diff mbox series

[22/26] serial: sifive: drop low-latency workaround

Message ID	20210421095509.3024-23-johan@kernel.org
State	New
Headers	show Return-Path: <linux-serial-owner@kernel.org> From: Johan Hovold <johan@kernel.org> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jirislaby@kernel.org>, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold <johan@kernel.org>, Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com> Subject: [PATCH 22/26] serial: sifive: drop low-latency workaround Date: Wed, 21 Apr 2021 11:55:05 +0200 Message-Id: <20210421095509.3024-23-johan@kernel.org> In-Reply-To: <20210421095509.3024-1-johan@kernel.org> References: <20210421095509.3024-1-johan@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	tty: drop low-latency workarounds \| expand [00/26] tty: drop low-latency workarounds [01/26] tty: mxser: drop low-latency workaround [02/26] serial: altera_jtaguart: drop low-latency workaround [03/26] serial: altera_uart: drop low-latency workaround [04/26] serial: amba-pl010: drop low-latency workaround [05/26] serial: amba-pl011: drop low-latency workaround [06/26] serial: apbuart: drop low-latency workaround [07/26] serial: ar933x: drop low-latency workaround [08/26] serial: arc_uart: drop low-latency workaround [09/26] serial: atmel_serial: drop low-latency workaround [10/26] serial: bcm63xx: drop low-latency workaround [11/26] serial: icom: drop low-latency workaround [12/26] serial: lpc32xx_hs: drop low-latency workaround [13/26] serial: mcf: drop low-latency workaround [14/26] serial: meson: drop low-latency workaround [15/26] serial: mpc52xx_uart: drop low-latency workaround [16/26] serial: msm_serial: drop low-latency workaround [17/26] serial: owl: drop low-latency workaround [18/26] serial: rda: drop low-latency workaround [19/26] serial: rp2: drop low-latency workaround [20/26] serial: sa1100: drop low-latency workaround [21/26] serial: txx9: drop low-latency workaround [22/26] serial: sifive: drop low-latency workaround [23/26] serial: sunsu: drop low-latency workaround [24/26] serial: timbuart: drop low-latency workaround [25/26] serial: vt8500: drop low-latency workaround [26/26] serial: xilinx_uartps: drop low-latency workaround

Commit Message

Johan Hovold April 21, 2021, 9:55 a.m. UTC

The sifive 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 45c054d0815b ("tty:
serial: add driver for the SiFive UART").

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.

Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/tty/serial/sifive.c | 2 --
 1 file changed, 2 deletions(-)

diff mbox series

Patch

diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
index 328d5a78792f..0ac0371f943b 100644
--- a/drivers/tty/serial/sifive.c
+++ b/drivers/tty/serial/sifive.c
@@ -448,9 +448,7 @@  static void __ssp_receive_chars(struct sifive_serial_port *ssp)
 		uart_insert_char(&ssp->port, 0, 0, ch, TTY_NORMAL);
 	}
 
-	spin_unlock(&ssp->port.lock);
 	tty_flip_buffer_push(&ssp->port.state->port);
-	spin_lock(&ssp->port.lock);
 }
 
 /**