Re: [PATCH v6 6/6] pci: Add support for creating a generic host_bridge from device tree

[Arnd Bergmann <arnd@arndb.de>]

On Wednesday 05 March 2014, Liviu Dudau wrote:
> +
> +	pr_debug("Parsing ranges property...\n");
> +	for_each_of_pci_range(&parser, &range) {
> +		/* Read next ranges element */
> +		pr_debug("pci_space: 0x%08x pci_addr:0x%016llx ",
> +				range.pci_space, range.pci_addr);
> +		pr_debug("cpu_addr:0x%016llx size:0x%016llx\n",
> +					range.cpu_addr, range.size);
> +
> +		/*
> +		 * If we failed translation or got a zero-sized region
> +		 * then skip this range
> +		 */
> +		if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
> +			continue;
> +
> +		res = kzalloc(sizeof(struct resource), GFP_KERNEL);
> +		if (!res)
> +			return -ENOMEM;
> +
> +		of_pci_range_to_resource(&range, dev, res);
> +
> +		if (resource_type(res) == IORESOURCE_IO)
> +			*io_base = range.cpu_addr;
> +
> +		pci_add_resource_offset(resources, res,
> +				res->start - range.pci_addr);
> +	}

As mentioned regarding the pci_register_io_range() helper, x86
would not enter the 'resource_type(res) == IORESOURCE_IO' code path,
which on the one hand is fine so we can return an error from
pci_register_io_range() there, but I think it will lead to
io_base getting an uninitialized content.

There could also be other reasons why pci_register_io_range() fails,
e.g. because the space is exhausted, and I think we should try to
catch that here and skip the pci_add_resource_offset() and io_base
assignment then.

	Arnd