linux-kernel - RE: [PATCH] gpio: Add Intel Granite Rapids-D vGPIO driver

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Date: Fri, 19 Apr 2024 19:59:48 +0000
From: "Elliott, Robert (Servers)" <elliott@....com>
To: Aapo Vienamo <aapo.vienamo@...ux.intel.com>,
        Linus Walleij
	<linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        "Andy
 Shevchenko" <andy@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Mika Westerberg
	<mika.westerberg@...ux.intel.com>,
        Andy Shevchenko
	<andriy.shevchenko@...ux.intel.com>
Subject: RE: [PATCH] gpio: Add Intel Granite Rapids-D vGPIO driver



> -----Original Message-----
> From: Aapo Vienamo <aapo.vienamo@...ux.intel.com>
> Sent: Friday, April 19, 2024 3:06 AM
> Subject: [PATCH] gpio: Add Intel Granite Rapids-D vGPIO driver
> 
..

> +static int gnr_gpio_probe(struct platform_device *pdev)
> +{
> +	size_t num_backup_pins = IS_ENABLED(CONFIG_PM_SLEEP) ? GNR_NUM_PINS
> : 0;
> +	struct device *dev = &pdev->dev;
> +	struct gpio_irq_chip *girq;
> +	struct gnr_gpio *priv;
> +	void __iomem *regs;
> +	int irq, ret;
> +
> +	priv = devm_kzalloc(dev, struct_size(priv, pad_backup,
> num_backup_pins), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	regs = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(regs))
> +		return PTR_ERR(regs);
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0)
> +		return irq;
> +
> +	ret = devm_request_irq(dev, irq, gnr_gpio_irq, IRQF_SHARED |
> IRQF_NO_THREAD,
> +			       dev_name(dev), priv);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "failed to request interrupt\n");

All of these early returns will leave the memory allocated to priv
forever, since priv isn't saved anywhere until:

> +	platform_set_drvdata(pdev, priv);