# Re: \[PATCH v6 1/5\] PCI: Handle IORESOURCE\_PCI\_FIXED when sizing resources.

- From: David Daney \<hidden\>
- Date: 2015-10-29 20:57:22 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2015/10/4610103
- Thread: https://ratatoskr.run/linux-pci/2015/10/4603257/t.md

```text
Bjorn,

A small snafu...

On 10/20/2015 04:04 PM, David Daney wrote:
> From: David Daney <redacted>
>
> The new Enhanced Allocation (EA) capability support (patches to
> follow) creates resources with the IORESOURCE_PCI_FIXED set. Since
> these resources cannot be relocated or resized, their alignment is not
> really defined, and it is therefore not specified.  This causes a
> problem in pbus_size_mem() where resources with unspecified alignment
> are disabled.
>
> So, in pbus_size_mem() skip IORESOURCE_PCI_FIXED resources, instead of
> disabling them.
>
> Acked-by: Sean O. Stalley <redacted>
> Signed-off-by: David Daney <redacted>
> ---
>   drivers/pci/setup-bus.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 508cc56..4dfef10 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -1037,9 +1037,10 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
>   			struct resource *r = &dev->resource[i];
>   			resource_size_t r_size;
>
> -			if (r->parent || ((r->flags & mask) != type &&
> -					  (r->flags & mask) != type2 &&
> -					  (r->flags & mask) != type3))
> +			if (r->parent || (r->flags | IORESOURCE_PCI_FIXED) ||

Should be:

  r->flags & IORESOURCE_PCI_FIXED

With the erroneous '|', sizing of bridge resources can break.

Q:  How to fix this.

  A) Replace this patch entirely?

  B) A patch on top of this one?


> +			    ((r->flags & mask) != type &&
> +			     (r->flags & mask) != type2 &&
> +			     (r->flags & mask) != type3))
>   				continue;
>   			r_size = resource_size(r);
>   #ifdef CONFIG_PCI_IOV
>
```