linux-kernel - Re: [PATCH] ata: Use platform_get

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Date:   Tue, 8 Mar 2022 14:49:59 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     cgel.zte@...il.com, s.shtylyov@....ru
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] ata: Use platform_get_irq() to get the interrupt

On 3/8/22 11:59, cgel.zte@...il.com wrote:
> From: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
> 
> 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 bypassed the hierarchical setup and messed up the
> irq chaining.
> 
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq().
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
> ---
>  drivers/ata/pata_pxa.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/ata/pata_pxa.c b/drivers/ata/pata_pxa.c
> index 41430f79663c..6394ab4cbc1b 100644
> --- a/drivers/ata/pata_pxa.c
> +++ b/drivers/ata/pata_pxa.c
> @@ -164,10 +164,10 @@ static int pxa_ata_probe(struct platform_device *pdev)
>  	struct resource *cmd_res;
>  	struct resource *ctl_res;
>  	struct resource *dma_res;
> -	struct resource *irq_res;
>  	struct pata_pxa_pdata *pdata = dev_get_platdata(&pdev->dev);
>  	struct dma_slave_config	config;
>  	int ret = 0;
> +	int irq;
>  
>  	/*
>  	 * Resource validation, three resources are needed:
> @@ -205,8 +205,8 @@ static int pxa_ata_probe(struct platform_device *pdev)
>  	/*
>  	 * IRQ pin
>  	 */
> -	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> -	if (unlikely(irq_res == NULL))
> +	irq = platform_get_irq(pdev, 0);
> +	if (unlikely(irq < 0))

This is not the hot path, so let's simplify: drop the unlikely() from
this if.

>  		return -EINVAL;
>  
>  	/*
> @@ -287,7 +287,7 @@ static int pxa_ata_probe(struct platform_device *pdev)
>  	/*
>  	 * Activate the ATA host
>  	 */
> -	ret = ata_host_activate(host, irq_res->start, ata_sff_interrupt,
> +	ret = ata_host_activate(host, irq, ata_sff_interrupt,
>  				pdata->irq_flags, &pxa_ata_sht);
>  	if (ret)
>  		dma_release_channel(data->dma_chan);


-- 
Damien Le Moal
Western Digital Research