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

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Date:   Thu, 5 Dec 2019 13:13:10 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Xiongfeng Wang <wangxiongfeng2@...wei.com>
Cc:     jslaby@...e.com, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, huawei.libin@...wei.com
Subject: Re: [PATCH] tty: omap-serial: remove set but unused variable

On Thu, Dec 05, 2019 at 08:04:36PM +0800, Xiongfeng Wang wrote:
> 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]
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@...wei.com>
> ---
>  drivers/tty/serial/omap-serial.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
> index 6420ae5..54ee3ae 100644
> --- a/drivers/tty/serial/omap-serial.c
> +++ b/drivers/tty/serial/omap-serial.c
> @@ -493,10 +493,9 @@ 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;
>  
>  	if (likely(lsr & UART_LSR_DR))
> -		ch = serial_in(up, UART_RX);
> +		serial_in(up, UART_RX);

Shouldn't you be doing something with 'ch'?