linux-kernel - Re: [PATCH v2 2/2] mmc: Add support for the ASPEED SD controller

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Date:   Fri, 26 Jul 2019 08:56:08 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Andrew Jeffery <andrew@...id.au>,
        linux-mmc <linux-mmc@...r.kernel.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, mark.rutland@....com,
        Joel Stanley <joel@....id.au>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Ryan Chen <ryanchen.aspeed@...il.com>
Subject: Re: [PATCH v2 2/2] mmc: Add support for the ASPEED SD controller

On 26/07/19 3:52 AM, Andrew Jeffery wrote:
> On Thu, 25 Jul 2019, at 22:49, Adrian Hunter wrote:
>> On 12/07/19 6:32 AM, Andrew Jeffery wrote:
>>> +static int aspeed_sdhci_probe(struct platform_device *pdev)
>>> +{
>>> +	struct sdhci_pltfm_host *pltfm_host;
>>> +	struct aspeed_sdhci *dev;
>>> +	struct sdhci_host *host;
>>> +	struct resource *res;
>>> +	int slot;
>>> +	int ret;
>>> +
>>> +	host = sdhci_pltfm_init(pdev, &aspeed_sdc_pdata, sizeof(*dev));
>>> +	if (IS_ERR(host))
>>> +		return PTR_ERR(host);
>>> +
>>> +	pltfm_host = sdhci_priv(host);
>>> +	dev = sdhci_pltfm_priv(pltfm_host);
>>> +	dev->parent = dev_get_drvdata(pdev->dev.parent);
>>> +
>>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> +	slot = aspeed_sdhci_calculate_slot(dev, res);
>>> +	if (slot < 0)
>>> +		return slot;
>>> +	dev_info(&pdev->dev, "Configuring for slot %d\n", slot);
>>> +	dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8;
>>
>> That implies that you only support 2 slots which begs the question why
>> you don't validate slot.
> 
> I'm not sure what you mean here, but I'll dig into it.

I just meant, if you only support 2 slots:

	if (slot > 1)
		return -EINVAL;