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SubjectRe: [PATCH] x86/pci/mrst: add extra check in fixed bar detection
On 07/16/2010 11:58 AM, Jacob Pan wrote:
> Fixed bar capability structure is searched in PCI extended configuration
> space. We need to make sure there is a valid capability id to begin with
> otherwise, the search code may stuck in a infinite loop which results in
> boot hang.
> This patch adds additional check for cap ID 0, which is also invalid.

I think this should be added to the stable tree for 2.6.34
as well...

Thanks,
Ben

>
> Suggested-by: "H. Peter Anvin"<hpa@zytor.com>
>
> Signed-off-by: Jacob Pan<jacob.jun.pan@linux.intel.com>
> ---
> arch/x86/pci/mrst.c | 7 ++++---
> 1 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/pci/mrst.c b/arch/x86/pci/mrst.c
> index c9649d0..8636567 100644
> --- a/arch/x86/pci/mrst.c
> +++ b/arch/x86/pci/mrst.c
> @@ -66,8 +66,9 @@ static int fixed_bar_cap(struct pci_bus *bus, unsigned int devfn)
> devfn, pos, 4,&pcie_cap))
> return 0;
>
> - if (pcie_cap == 0xffffffff)
> - return 0;
> + if (PCI_EXT_CAP_ID(pcie_cap) == 0x0000 ||
> + PCI_EXT_CAP_ID(pcie_cap) == 0xffff)
> + break;
>
> if (PCI_EXT_CAP_ID(pcie_cap) == PCI_EXT_CAP_ID_VNDR) {
> raw_pci_ext_ops->read(pci_domain_nr(bus), bus->number,
> @@ -76,7 +77,7 @@ static int fixed_bar_cap(struct pci_bus *bus, unsigned int devfn)
> return pos;
> }
>
> - pos = pcie_cap>> 20;
> + pos = PCI_EXT_CAP_NEXT(pcie_cap);
> }
>
> return 0;


--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com



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