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SubjectRe: [PATCH AUTOSEL 5.5 188/542] tty: omap-serial: remove set but unused variable
On Fri, Feb 14, 2020 at 10:43:00AM -0500, Sasha Levin wrote:
> From: Xiongfeng Wang <wangxiongfeng2@huawei.com>
>
> [ 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@huawei.com>
> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
> Link: https://lore.kernel.org/r/1575617863-32484-1-git-send-email-wangxiongfeng2@huawei.com
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> 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
>

Please drop.

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