linux-kernel - Re: [PATCH 10/10] soc: qcom: convert to devm_platform_ioremap

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Date:   Sun, 15 Dec 2019 10:48:24 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Yangtao Li <tiny.windzz@...il.com>
Cc:     khilman@...libre.com, leoyang.li@....com, khalasa@...p.pl,
        john@...ozen.org, matthias.bgg@...il.com, agross@...nel.org,
        bjorn.andersson@...aro.org, kgene@...nel.org, krzk@...nel.org,
        mripard@...nel.org, wens@...e.org, ssantosh@...nel.org,
        jun.nie@...aro.org, shawnguo@...nel.org,
        linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 10/10] soc: qcom: convert to
 devm_platform_ioremap_resource

On Sat, 14 Dec 2019 17:54:47 +0000
Yangtao Li <tiny.windzz@...il.com> wrote:

> Use devm_platform_ioremap_resource() to simplify code.
> 
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
>  drivers/soc/qcom/llcc-qcom.c    | 7 +------
>  drivers/soc/qcom/qcom-geni-se.c | 4 +---
>  drivers/soc/qcom/qcom_aoss.c    | 4 +---
>  drivers/soc/qcom/qcom_gsbi.c    | 5 +----
>  drivers/soc/qcom/spm.c          | 4 +---
>  5 files changed, 5 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> index 429b5a60a1ba..99e19df76889 100644
> --- a/drivers/soc/qcom/llcc-qcom.c
> +++ b/drivers/soc/qcom/llcc-qcom.c
> @@ -387,7 +387,6 @@ static int qcom_llcc_remove(struct platform_device *pdev)
>  static struct regmap *qcom_llcc_init_mmio(struct platform_device *pdev,
>  		const char *name)
>  {
> -	struct resource *res;
>  	void __iomem *base;
>  	struct regmap_config llcc_regmap_config = {
>  		.reg_bits = 32,
> @@ -396,11 +395,7 @@ static struct regmap *qcom_llcc_init_mmio(struct platform_device *pdev,
>  		.fast_io = true,
>  	};
>  
> -	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
> -	if (!res)
> -		return ERR_PTR(-ENODEV);
> -
> -	base = devm_ioremap_resource(&pdev->dev, res);
> +	base = devm_platform_ioremap_resource(pdev, 0);

What guarantees do you have that entry 0 matches name?

I find these changes pointless: they don't add much to the readability
or maintainability of the code, and instead introduce creative bugs.

	M.
-- 
Jazz is not dead. It just smells funny...