linux-kernel - Re: [PATCH] thermal: rcar_thermal: Use platform_get_irq

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Date:   Mon, 20 Dec 2021 13:29:43 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     linux-renesas-soc@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH] thermal: rcar_thermal: Use platform_get_irq_optional() to
 get the interrupt

On 18/12/2021 15:41, Lad Prabhakar wrote:
> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> allocation of IRQ resources in DT core code, this causes an issue
> when using hierarchical interrupt domains using "interrupts" property
> in the node as this bypasses the hierarchical setup and messes up the
> irq chaining.
> 
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional().
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> Hi,
> 
> Dropping usage of platform_get_resource() was agreed based on
> the discussion [0].
> 
> [0] https://patchwork.kernel.org/project/linux-renesas-soc/
> patch/20211209001056.29774-1-prabhakar.mahadev-lad.rj@...renesas.com/
> 
> Cheers,
> Prabhakar
> ---
>  drivers/thermal/rcar_thermal.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
> index b49f04daaf47..e4c7bc1bf7ef 100644
> --- a/drivers/thermal/rcar_thermal.c
> +++ b/drivers/thermal/rcar_thermal.c
> @@ -445,7 +445,7 @@ static int rcar_thermal_probe(struct platform_device *pdev)
>  	struct rcar_thermal_common *common;
>  	struct rcar_thermal_priv *priv;
>  	struct device *dev = &pdev->dev;
> -	struct resource *res, *irq;
> +	struct resource *res;
>  	const struct rcar_thermal_chip *chip = of_device_get_match_data(dev);
>  	int mres = 0;
>  	int i;
> @@ -467,9 +467,16 @@ static int rcar_thermal_probe(struct platform_device *pdev)
>  	pm_runtime_get_sync(dev);
>  
>  	for (i = 0; i < chip->nirqs; i++) {
> -		irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
> -		if (!irq)
> +		int irq;
> +
> +		irq = platform_get_irq_optional(pdev, i);
> +		if (irq <= 0 && irq != -ENXIO) {
> +			ret = irq ? irq : -ENXIO;
> +			goto error_unregister;
> +		}
> +		if (irq == -ENXIO)
>  			continue;

Why not invert the conditions?

		if (irq == -ENXIO)
			continue;

		if (irq <= 0) {
			ret = irq ? irq : -ENXIO;
			goto out_unregister;
		}


> +
>  		if (!common->base) {
>  			/*
>  			 * platform has IRQ support.
> @@ -487,7 +494,7 @@ static int rcar_thermal_probe(struct platform_device *pdev)
>  			idle = 0; /* polling delay is not needed */
>  		}
>  
> -		ret = devm_request_irq(dev, irq->start, rcar_thermal_irq,
> +		ret = devm_request_irq(dev, irq, rcar_thermal_irq,
>  				       IRQF_SHARED, dev_name(dev), common);
>  		if (ret) {
>  			dev_err(dev, "irq request failed\n ");
> 


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