linux-kernel - Re: [PATCH v13 net-next 03/15] net: mvpp2: add CM3 SRAM memory map

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Date:   Thu, 11 Feb 2021 11:05:19 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     stefanc@...vell.com
Cc:     netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        davem@...emloft.net, nadavh@...vell.com, ymarkman@...vell.com,
        linux-kernel@...r.kernel.org, kuba@...nel.org, mw@...ihalf.com,
        andrew@...n.ch, atenart@...nel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, sebastian.hesselbarth@...il.com,
        gregory.clement@...tlin.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v13 net-next 03/15] net: mvpp2: add CM3 SRAM memory map

On Thu, Feb 11, 2021 at 12:48:50PM +0200, stefanc@...vell.com wrote:
> +static int mvpp2_get_sram(struct platform_device *pdev,
> +			  struct mvpp2 *priv)
> +{
> +	struct resource *res;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> +	if (!res) {
> +		if (has_acpi_companion(&pdev->dev))
> +			dev_warn(&pdev->dev, "ACPI is too old, Flow control not supported\n");
> +		else
> +			dev_warn(&pdev->dev, "DT is too old, Flow control not supported\n");
> +		return 0;
> +	}
> +
> +	priv->cm3_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(priv->cm3_base))
> +		return PTR_ERR(priv->cm3_base);
> +
> +	return 0;

You can clean this up to use:

	return PTR_ERR_OR_ZERO(priv->cm3_base);

> +
> +		/* Map CM3 SRAM */
> +		err = mvpp2_get_sram(pdev, priv);
> +		if (err)
> +			dev_warn(&pdev->dev, "Fail to alloc CM3 SRAM\n");

It looks to me like mvpp2_get_sram() only fails if we are unable to
_map_ the CM3 SRAM. We are no longer allocating anything from it, so
I think this message needs to be updated.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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