On Sun, Aug 31, 2008 at 11:03 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
quoted text
>
>
> On Sun, 31 Aug 2008, Yinghai Lu wrote:
>>
>> wonder how the probe could find out the size of is 1fff_ffff..
>
> Heh. That's how PCI sizing works: you write all ones to the register, and
> read back the result. The low bits won't change, and that indicates the
> size.
>
> But if _none_ of the bits change, then that simply means that the size
> will be calculated to be 0xffffffff-start.
>
> So the sizing will "work", it will just always report that the BAR covers
> everything from start to the 4G limit.

how about


diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index cce2f4c..3b5269a 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -240,6 +240,11 @@ static int __pci_read_base(struct pci_dev *dev,
enum pci_bar_type type,
        pci_read_config_dword(dev, pos, &l);
        pci_write_config_dword(dev, pos, mask);
        pci_read_config_dword(dev, pos, &sz);
+
+       /* sticky and non changable */
+       if (sz == l)
+               goto fail;
+
        pci_write_config_dword(dev, pos, l);

        /*


Rafael,

can you check attach one  to see if we still have warning ?

YH