linux-kernel - Re: [PATCH 02/10] goldfish: add the goldfish virtual bus

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Date:	Wed, 16 Jan 2013 18:57:54 +0200
From:	Felipe Balbi <balbi@...com>
To:	Alan Cox <alan@...ux.intel.com>
CC:	<arve@...roid.com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>, <mikechan@...gle.com>
Subject: Re: [PATCH 02/10] goldfish: add the goldfish virtual bus

Hi,

On Wed, Jan 16, 2013 at 04:58:51PM +0000, Alan Cox wrote:
> +static irqreturn_t goldfish_pdev_bus_interrupt(int irq, void *dev_id)
> +{
> +	irqreturn_t ret = IRQ_NONE;
> +	while (1) {
> +		u32 op = readl(pdev_bus_base + PDEV_BUS_OP);
> +		switch (op) {
> +		case PDEV_BUS_OP_DONE:
> +			return IRQ_NONE;
> +
> +		case PDEV_BUS_OP_REMOVE_DEV:
> +			goldfish_pdev_remove();
> +			break;
> +
> +		case PDEV_BUS_OP_ADD_DEV:
> +			goldfish_new_pdev();
> +			break;
> +		}
> +		ret = IRQ_HANDLED;
> +	}

missing a return ret here ?

> +}
> +
> +static int goldfish_pdev_bus_probe(struct platform_device *pdev)
> +{
> +	int ret;
> +	struct resource *r;
> +
> +	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (r == NULL)
> +		return -EINVAL;
> +
> +	pdev_bus_addr = r->start;
> +	pdev_bus_len = resource_size(r);
> +
> +	if (request_region(pdev_bus_addr, pdev_bus_len, "goldfish")) {
> +		pr_err("unable to reserve Goldfish MMIO.\n");
> +		return -EBUSY;
> +	}
> +
> +	pdev_bus_base = ioremap(pdev_bus_addr, pdev_bus_len);

how about converting the two above to devm_request_and_ioremap() ?

> +	if (pdev_bus_base == NULL) {
> +		ret = -ENOMEM;
> +		pr_err("unable to map Goldfish MMIO.\n");
> +		goto free_resources;
> +	}
> +
> +	r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	if (r == NULL) {
> +		ret = -ENOENT;
> +		goto free_map;
> +	}
> +
> +	pdev_bus_irq = r->start;
> +
> +	ret = request_irq(pdev_bus_irq, goldfish_pdev_bus_interrupt,

and here to devm_request_irq() ...

> +				IRQF_SHARED, "goldfish_pdev_bus", pdev);
> +	if (ret)
> +		goto free_map;
> +
> +	writel(PDEV_BUS_OP_INIT, pdev_bus_base + PDEV_BUS_OP);
> +	return 0;
> +
> +free_map:
> +	iounmap(pdev_bus_base);
> +free_resources:
> +	release_region(pdev_bus_addr, pdev_bus_len);
> +	return ret;
> +}
> +
> +static int goldfish_pdev_bus_remove(struct platform_device *pdev)
> +{
> +	iounmap(pdev_bus_base);
> +	free_irq(pdev_bus_irq, pdev);
> +	release_region(pdev_bus_addr, pdev_bus_len);

your remove would, then, be an empty function.

-- 
balbi

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