linux-kernel - Re: [PATCH v2 1/4] ata: pata_platform: make use of platform_get_mem_or

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Message-ID: <d851cdc5-78c6-ff35-979f-7aec71f3cb9b@opensource.wdc.com>
Date:   Thu, 23 Dec 2021 09:35:23 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sergey Shtylyov <s.shtylyov@....ru>, linux-ide@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v2 1/4] ata: pata_platform: make use of
 platform_get_mem_or_io()

On 12/22/21 01:26, Lad Prabhakar wrote:
> Make use of platform_get_mem_or_io() to simplify the code.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v1-->v2
> * No change
> ---
>  drivers/ata/pata_platform.c | 18 ++++++------------
>  1 file changed, 6 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
> index 028329428b75..cb3134bf88eb 100644
> --- a/drivers/ata/pata_platform.c
> +++ b/drivers/ata/pata_platform.c
> @@ -198,22 +198,16 @@ static int pata_platform_probe(struct platform_device *pdev)
>  	/*
>  	 * Get the I/O base first
>  	 */
> -	io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
> -	if (io_res == NULL) {
> -		io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -		if (unlikely(io_res == NULL))
> -			return -EINVAL;
> -	}
> +	io_res = platform_get_mem_or_io(pdev, 0);
> +	if (unlikely(!io_res))

This is not the hot path, so I do not think that the unlikely() is
necessary here.

> +		return -EINVAL;
>  
>  	/*
>  	 * Then the CTL base
>  	 */
> -	ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
> -	if (ctl_res == NULL) {
> -		ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> -		if (unlikely(ctl_res == NULL))
> -			return -EINVAL;
> -	}
> +	ctl_res = platform_get_mem_or_io(pdev, 1);
> +	if (unlikely(!ctl_res))

Same comment here.

> +		return -EINVAL;
>  
>  	/*
>  	 * And the IRQ


-- 
Damien Le Moal
Western Digital Research