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From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Haoran Liu <liuhaoran14@163.com>
Cc: claudiu.beznea@tuxon.dev, sre@kernel.org,
	nicolas.ferre@microchip.com, linux-pm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [power/reset] at91-sama5d2: Add error handling in at91_shdwc_probe
Date: Wed, 29 Nov 2023 18:15:55 +0100	[thread overview]
Message-ID: <20231129171555abae472b@mail.local> (raw)
In-Reply-To: <20231129132939.34047-1-liuhaoran14@163.com>

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@163.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

WARNING: multiple messages have this Message-ID (diff)
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Haoran Liu <liuhaoran14@163.com>
Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
	sre@kernel.org, claudiu.beznea@tuxon.dev,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] [power/reset] at91-sama5d2: Add error handling in at91_shdwc_probe
Date: Wed, 29 Nov 2023 18:15:55 +0100	[thread overview]
Message-ID: <20231129171555abae472b@mail.local> (raw)
In-Reply-To: <20231129132939.34047-1-liuhaoran14@163.com>

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@163.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

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  parent reply	other threads:[~2023-11-29 17:15 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-29 13:29 [PATCH] [power/reset] at91-sama5d2: Add error handling in at91_shdwc_probe Haoran Liu
2023-11-29 13:29 ` Haoran Liu
2023-11-29 13:43 ` Nicolas Ferre
2023-11-29 13:43   ` Nicolas Ferre
2023-11-29 17:15 ` Alexandre Belloni [this message]
2023-11-29 17:15   ` Alexandre Belloni

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