linux-kernel - Re: [PATCH] iio:proximity:sx9324: Check ret value of device_property_read_u32

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Date:   Mon, 13 Jun 2022 16:25:55 -0700
From:   Gwendal Grignou <gwendal@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Aashish Sharma <shraash@...gle.com>,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        linux-iio@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] iio:proximity:sx9324: Check ret value of device_property_read_u32_array()

On Mon, Jun 13, 2022 at 4:22 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> From: Aashish Sharma <shraash@...gle.com>
>
> 0-day reports:
>
> drivers/iio/proximity/sx9324.c:868:3: warning: Value stored
> to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
>
> Put an if condition to break out of switch if ret is non-zero.
>
> Signed-off-by: Aashish Sharma <shraash@...gle.com>
> Fixes: a8ee3b32f5da ("iio:proximity:sx9324: Add dt_binding support")
> Reported-by: kernel test robot <lkp@...el.com>
> [swboyd@...omium.org: Reword commit subject, add fixes tag]
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
Reviewed-by: Gwendal Grignou <gwendal@...omium.org>
> ---
>  drivers/iio/proximity/sx9324.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/iio/proximity/sx9324.c b/drivers/iio/proximity/sx9324.c
> index 70c37f664f6d..63fbcaa4cac8 100644
> --- a/drivers/iio/proximity/sx9324.c
> +++ b/drivers/iio/proximity/sx9324.c
> @@ -885,6 +885,9 @@ sx9324_get_default_reg(struct device *dev, int idx,
>                         break;
>                 ret = device_property_read_u32_array(dev, prop, pin_defs,
>                                                      ARRAY_SIZE(pin_defs));
> +               if (ret)
> +                       break;
> +
>                 for (pin = 0; pin < SX9324_NUM_PINS; pin++)
>                         raw |= (pin_defs[pin] << (2 * pin)) &
>                                SX9324_REG_AFE_PH0_PIN_MASK(pin);
>
> base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56
> --
> https://chromeos.dev
>