linux-kernel - [PATCH v4 5/6] serial: 8250_dw: Use serial_lsr_in() in dw8250_handle

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Message-Id: <20220608095431.18376-6-ilpo.jarvinen@linux.intel.com>
Date:   Wed,  8 Jun 2022 12:54:30 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-serial@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Douglas Anderson <dianders@...omium.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH v4 5/6] serial: 8250_dw: Use serial_lsr_in() in dw8250_handle_irq()

dw8250_handle_irq() reads LSR under a few conditions, convert both to
use serial_lsr_in() in order to preserve LSR flags properly across
reads.

Cc: Douglas Anderson <dianders@...omium.org>
Cc: Phil Edworthy <phil.edworthy@...esas.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>
Fixes: 424d79183af0 ("serial: 8250_dw: Avoid "too much work" from bogus rx timeout interrupt")
Fixes: aa63d786cea2 ("serial: 8250: dw: Add support for DMA flow controlling devices")
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/tty/serial/8250/8250_dw.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index f57bbd32ef11..1fae45991812 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -253,7 +253,7 @@ static int dw8250_handle_irq(struct uart_port *p)
 	 */
 	if (!up->dma && rx_timeout) {
 		spin_lock_irqsave(&p->lock, flags);
-		status = p->serial_in(p, UART_LSR);
+		status = serial_lsr_in(up);
 
 		if (!(status & (UART_LSR_DR | UART_LSR_BI)))
 			(void) p->serial_in(p, UART_RX);
@@ -263,7 +263,7 @@ static int dw8250_handle_irq(struct uart_port *p)
 
 	/* Manually stop the Rx DMA transfer when acting as flow controller */
 	if (quirks & DW_UART_QUIRK_IS_DMA_FC && up->dma && up->dma->rx_running && rx_timeout) {
-		status = p->serial_in(p, UART_LSR);
+		status = serial_lsr_in(up);
 		if (status & (UART_LSR_DR | UART_LSR_BI)) {
 			dw8250_writel_ext(p, RZN1_UART_RDMACR, 0);
 			dw8250_writel_ext(p, DW_UART_DMASA, 1);
-- 
2.30.2