linux-kernel - Re: [PATCH] gpio: gpio-xilinx: Check return value of of_property_read

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Message-ID: <bd4ff961-37b8-607b-e801-bff37d0eb452@amd.com>
Date:   Fri, 17 Jun 2022 08:02:26 +0200
From:   Michal Simek <michal.simek@....com>
To:     Srinivas Neeli <srinivas.neeli@...inx.com>,
        <linus.walleij@...aro.org>, <brgl@...ev.pl>,
        <bgolaszewski@...libre.com>, <michal.simek@...inx.com>,
        <neelisrinivas18@...il.com>, <shubhrajyoti.datta@...inx.com>,
        <srinivas.neeli@....com>, <sgoud@...inx.com>
CC:     <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <git@...inx.com>
Subject: Re: [PATCH] gpio: gpio-xilinx: Check return value of
 of_property_read_u32



On 6/17/22 07:19, Srinivas Neeli wrote:
> In five different instances the return value of "of_property_read_u32"
> API was neither captured nor checked.
> 
> Fixed it by capturing the return value and then checking for any error.
> 
> Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
> Addresses-Coverity: "check_return"
> ---
>   drivers/gpio/gpio-xilinx.c | 15 ++++++++++-----
>   1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
> index b6d3a57e27ed..268c7b0e481d 100644
> --- a/drivers/gpio/gpio-xilinx.c
> +++ b/drivers/gpio/gpio-xilinx.c
> @@ -570,7 +570,8 @@ static int xgpio_probe(struct platform_device *pdev)
>   	platform_set_drvdata(pdev, chip);
>   
>   	/* First, check if the device is dual-channel */
> -	of_property_read_u32(np, "xlnx,is-dual", &is_dual);
> +	if (of_property_read_u32(np, "xlnx,is-dual", &is_dual))
> +		is_dual = 0;

All these values are initialized already.
Isn't it enough to just ignore return value like this to make coverity happy?

(void)of_property_read_u32(np, "xlnx,is-dual", &is_dual)

Thanks,
Michal