linux-kernel - Re: [PATCH] [power/reset] at91-sama5d2: Add error handling in at91_shdwc

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Date:   Wed, 29 Nov 2023 18:15:55 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Haoran Liu <liuhaoran14@....com>
Cc:     claudiu.beznea@...on.dev, sre@...nel.org,
        nicolas.ferre@...rochip.com, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [power/reset] at91-sama5d2: Add error handling in
 at91_shdwc_probe

On 29/11/2023 05:29:39-0800, Haoran Liu wrote:
> This patch adds error handling to the at91_shdwc_probe function
> in drivers/power/reset/at91-sama5d2_shdwc.c. The function
> previously did not handle the case where of_match_node could fail,
> potentially leading to unexpected behavior if the device tree match
> was unsuccessful.
> 
> Signed-off-by: Haoran Liu <liuhaoran14@....com>
> ---
>  drivers/power/reset/at91-sama5d2_shdwc.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/power/reset/at91-sama5d2_shdwc.c b/drivers/power/reset/at91-sama5d2_shdwc.c
> index e76b102b57b1..2ac566c83aec 100644
> --- a/drivers/power/reset/at91-sama5d2_shdwc.c
> +++ b/drivers/power/reset/at91-sama5d2_shdwc.c
> @@ -353,6 +353,11 @@ static int __init at91_shdwc_probe(struct platform_device *pdev)
>  		return PTR_ERR(at91_shdwc->shdwc_base);
>  
>  	match = of_match_node(at91_shdwc_of_match, pdev->dev.of_node);
> +	if (!match) {

Can you elaborate how this will ever happen?

> +		dev_err(&pdev->dev, "No matching device found\n");
> +		return -ENODEV;
> +	}
> +
>  	at91_shdwc->rcfg = match->data;
>  
>  	at91_shdwc->sclk = devm_clk_get(&pdev->dev, NULL);
> -- 
> 2.17.1
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com