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

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Message-ID: <CAKwvOdnDHr8VVd3qxxXE18_KOhSb1M7D0GQ77Y0xiqJyBtXRPA@mail.gmail.com>
Date:   Fri, 22 Mar 2019 11:04:52 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        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>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] tty: serial: qcom_geni_serial: Initialize baud in qcom_geni_console_setup

On Fri, Mar 22, 2019 at 7:20 AM Arnd Bergmann <arnd@...db.de> wrote:
>
> 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.

Good point, we use this driver for Pixel, and I usually connect with a
baud rate of 115200.

-- 
Thanks,
~Nick Desaulniers