linux-kernel - Re: [PATCH] media: tc358743: initialize variable

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Message-ID: <CAKwvOdkvY62xVKQcVHxMTpskO=bB2sxwiOQb+TGF0-oU2Q6unA@mail.gmail.com>
Date:   Mon, 31 Aug 2020 10:31:55 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     trix@...hat.com
Cc:     matrandg@...co.com, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        p.zabel@...gutronix.de, Hans Verkuil <hans.verkuil@...co.com>,
        linux-media@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: tc358743: initialize variable

On Sun, Aug 30, 2020 at 9:30 AM <trix@...hat.com> wrote:
>
> From: Tom Rix <trix@...hat.com>
>
> clang static analysis flags this error
>
> tc358743.c:1468:9: warning: Branch condition evaluates
>   to a garbage value
>         return handled ? IRQ_HANDLED : IRQ_NONE;
>                ^~~~~~~
> handled should be initialized to false.
>
> Fixes: d747b806abf4 ("[media] tc358743: add direct interrupt handling")
> Signed-off-by: Tom Rix <trix@...hat.com>

I'm guessing there was more to the report that says that `handled`
isn't necessarily initialized along any of the paths within
tc358743_isr()?  But you should fix this for all callers of
tc358743_isr(), such as tc358743_work_i2c_poll(), not just
tc358743_irq_handler().

> ---
>  drivers/media/i2c/tc358743.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c
> index a03dcab5ce61..c724bd1591de 100644
> --- a/drivers/media/i2c/tc358743.c
> +++ b/drivers/media/i2c/tc358743.c
> @@ -1461,7 +1461,7 @@ static int tc358743_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
>  static irqreturn_t tc358743_irq_handler(int irq, void *dev_id)
>  {
>         struct tc358743_state *state = dev_id;
> -       bool handled;
> +       bool handled = false;
>
>         tc358743_isr(&state->sd, 0, &handled);
>
> --
> 2.18.1
>


-- 
Thanks,
~Nick Desaulniers