linux-kernel - Re: [PATCH 3/4] PCI: v3-semi: Use devm_platform_get_and_ioremap

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Date:   Fri, 7 Jul 2023 03:55:11 +0900
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Yangtao Li <frank.li@...o.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yang Li <yang.lee@...ux.alibaba.com>
Subject: Re: [PATCH 3/4] PCI: v3-semi: Use
 devm_platform_get_and_ioremap_resource()

[+Cc Yang]

Hello,

> Convert platform_get_resource(), devm_ioremap_resource() to a single
> call to devm_platform_get_and_ioremap_resource(), as this is exactly
> what this function does.

A very similar series was posted a while ago.  Patches 1, 2 and 4 in this
series are identical, except for this patch, which adds one more very nice
refactoring,

The other series:

  https://lore.kernel.org/linux-pci/20230626110226.GA569947@rocinante

What I can do would be to pick this patch and squash it with the other ones
that are already applied.  I will then attribute both you and Yang Li as
the authors.  Let me know if this is fine with you, Yangtao and Yang.

That said...

> diff --git a/drivers/pci/controller/pci-v3-semi.c b/drivers/pci/controller/pci-v3-semi.c
> index ca44b0c83d1b..0f993328dba2 100644
> --- a/drivers/pci/controller/pci-v3-semi.c
> +++ b/drivers/pci/controller/pci-v3-semi.c
> @@ -736,8 +736,7 @@ static int v3_pci_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	v3->base = devm_ioremap_resource(dev, regs);
> +	v3->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);

Are you sure about the variable name here? This might be a small copy-and-paste
mistake that snuck up here.  Have a closer look, or better yet, try to compile
and test this. :)

> -	regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	v3->config_base = devm_platform_get_and_ioremap_resource(pdev, 1, &res);

Same as above.

> +	if (IS_ERR(v3->config_base))
> +		return PTR_ERR(v3->config_base);
>  	if (resource_size(regs) != SZ_16M) {
>  		dev_err(dev, "config mem is not 16MB!\n");
>  		return -EINVAL;
>  	}
>  	v3->config_mem = regs->start;
> -	v3->config_base = devm_ioremap_resource(dev, regs);
> -	if (IS_ERR(v3->config_base))
> -		return PTR_ERR(v3->config_base);

This could be made such that the assignments are together.

	Krzysztof