From: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx> [ Upstream commit e83c6587c47caa2278aa3bd603b5a85eddc4cec9 ] 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@xxxxxxxxxx> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx> Link: https://lore.kernel.org/r/1575617863-32484-1-git-send-email-wangxiongfeng2@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 6420ae581a802..5f808d8dfcd5c 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; -- 2.20.1
