On Mon, Sep 22, 2014 at 10:32 AM, Liviu Dudau <Liviu.Dudau@xxxxxxx> wrote:
> On Sat, Sep 20, 2014 at 06:33:11PM +0100, Rob Herring wrote:
>> On 09/17/2014 08:30 PM, Liviu Dudau wrote:
>> > The ranges property for a host bridge controller in DT describes
>> > the mapping between the PCI bus address and the CPU physical address.
>> > The resources framework however expects that the IO resources start
>> > at a pseudo "port" address 0 (zero) and have a maximum size of IO_SPACE_LIMIT.
>> > The conversion from pci ranges to resources failed to take that into account.
[...]
>> > if ((range.flags & IORESOURCE_MEM) &&
>> > (range.flags & IORESOURCE_PREFETCH)) {
>> > pre_mem_pci = range.pci_addr;
>> > pre_mem_pci_sz = range.size;
>> > - of_pci_range_to_resource(&range, np, &pre_mem);
>> > + ret = of_pci_range_to_resource(&range, np, &pre_mem);
>> > pre_mem.name = "PCIv3 prefetched mem";
>> > }
>> > - }
>> >
>> > - if (!conf_mem.start || !io_mem.start ||
>> > - !non_mem.start || !pre_mem.start) {
>> > - dev_err(&pdev->dev, "missing ranges in device node\n");
>> > - return -EINVAL;
>> > + if (ret < 0) {
>> > + dev_err(&pdev->dev, "missing ranges in device node\n");
>> > + return -EINVAL;
>>
>> You should return ret rather than potentially changing the return value.
>
> I was trying to keep the existing behaviour, which was to return -EINVAL if the
> parsing has failed. But I can return ret and propagate the original error code.
A valid concern, but I checked and I believe the return from
of_pci_range_to_resource is currently -EINVAL.
>> > +int of_pci_range_to_resource(struct of_pci_range *range,
>> > + struct device_node *np, struct resource *res)
>> > +{
>> > + int err;
>> > + res->flags = range->flags;
>> > + res->parent = res->child = res->sibling = NULL;
>> > + res->name = np->full_name;
>> > +
>> > + if (res->flags & IORESOURCE_IO) {
>> > + unsigned long port = -1;
>>
>> Assigning a signed value to unsigned...
>
> Ooops, sorry about that. Removed the initialisation now.
>
>>
>> Does port need to be 64-bit on 64-bit hosts?
>
> I'm following existing APIs. Basically my function is a variant of __of_address_to_resource()
Okay.
Rob
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