linux-kernel - [PATCH v2] tty: omap-serial: remove set but unused variable

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Message-ID: <1575617863-32484-1-git-send-email-wangxiongfeng2@huawei.com>
Date:   Fri, 6 Dec 2019 15:37:43 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     <gregkh@...uxfoundation.org>, <jslaby@...e.com>
CC:     <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <huawei.libin@...wei.com>, <wangxiongfeng2@...wei.com>
Subject: [PATCH v2] tty: omap-serial: remove set but unused variable

Fix the following warning:
drivers/tty/serial/omap-serial.c: In function serial_omap_rlsi:
drivers/tty/serial/omap-serial.c:496:16: warning: variable ch set but not used [-Wunused-but-set-variable]

The character read is useless according to the table 23-246 of the omap4
TRM. So we can drop it.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@...wei.com>
---
 drivers/tty/serial/omap-serial.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 6420ae5..5f808d8 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -493,10 +493,13 @@ static unsigned int check_modem_status(struct uart_omap_port *up)
 static void serial_omap_rlsi(struct uart_omap_port *up, unsigned int lsr)
 {
 	unsigned int flag;
-	unsigned char ch = 0;
 
+	/*
+	 * Read one data character out to avoid stalling the receiver according
+	 * to the table 23-246 of the omap4 TRM.
+	 */
 	if (likely(lsr & UART_LSR_DR))
-		ch = serial_in(up, UART_RX);
+		serial_in(up, UART_RX);
 
 	up->port.icount.rx++;
 	flag = TTY_NORMAL;
-- 
1.7.12.4