linux-kernel - Re: [PATCH] watchdog: armada_37xx_wdt: check the return value of devm_ioremap() in armada_37xx_wdt

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Message-ID: <20220722091431.1572e92c@dellmb>
Date:   Fri, 22 Jul 2022 09:14:31 +0200
From:   Marek Behún <kabel@...nel.org>
To:     williamsukatube@....com
Cc:     wim@...ux-watchdog.org, linux@...ck-us.net,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        William Dean <williamsukatube@...il.com>,
        Hacash Robot <hacashRobot@...tino.com>
Subject: Re: [PATCH] watchdog: armada_37xx_wdt: check the return value of
 devm_ioremap() in armada_37xx_wdt_probe()

On Fri, 22 Jul 2022 11:09:38 +0800
williamsukatube@....com wrote:

> From: William Dean <williamsukatube@...il.com>
> 
> The function devm_ioremap() in armada_37xx_wdt_probe() can fail, so
> its return value should be checked.
> 
> Fixes: 54e3d9b518c8a ("watchdog: Add support for Armada 37xx CPU watchdog")
> Reported-by: Hacash Robot <hacashRobot@...tino.com>
> Signed-off-by: William Dean <williamsukatube@...il.com>
> ---
>  drivers/watchdog/armada_37xx_wdt.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/watchdog/armada_37xx_wdt.c b/drivers/watchdog/armada_37xx_wdt.c
> index 1635f421ef2c..854b1cc723cb 100644
> --- a/drivers/watchdog/armada_37xx_wdt.c
> +++ b/drivers/watchdog/armada_37xx_wdt.c
> @@ -274,6 +274,8 @@ static int armada_37xx_wdt_probe(struct platform_device *pdev)
>  	if (!res)
>  		return -ENODEV;
>  	dev->reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> +	if (!dev->reg)
> +		return -ENOMEM;
>  
>  	/* init clock */
>  	dev->clk = devm_clk_get(&pdev->dev, NULL);

Reviewed-by: Marek Behún <kabel@...nel.org>