linux-kernel - Re: [PATCH] tty: serial: qcom_geni_serial: Initialize baud in qcom_geni_console

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Date:   Fri, 22 Mar 2019 15:20:28 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] tty: serial: qcom_geni_serial: Initialize baud in qcom_geni_console_setup

On Fri, Mar 8, 2019 at 7:38 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> When building with -Wsometimes-uninitialized, Clang warns:
>
> drivers/tty/serial/qcom_geni_serial.c:1079:6: warning: variable 'baud'
> is used uninitialized whenever 'if' condition is false
> [-Wsometimes-uninitialized]
>
> It's not wrong; when options is NULL, baud has no default value. Use
> 9600 as that is a sane default.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/395
> Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  drivers/tty/serial/qcom_geni_serial.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index 3bcec1c20219..35e5f9c5d5be 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -1050,7 +1050,7 @@ static int __init qcom_geni_console_setup(struct console *co, char *options)
>  {
>         struct uart_port *uport;
>         struct qcom_geni_serial_port *port;
> -       int baud;
> +       int baud = 9600;
>         int bits = 8;
>         int parity = 'n';
>         int flow = 'n';

I made a similar patch here, but after looking at the driver concluded
that the bitrate had to be 115200, since that is used as the default
value otherwise.

        Arnd