Messages in this thread | | | Date | Sat, 22 Dec 2007 00:29:51 -0500 | From | Tony Camuso <> | Subject | Re: [PATCH 0/5]PCI: x86 MMCONFIG - a couple of corrections to the preamble |
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Some corrections to the preamble.
> The large amount of text is due to the nature of the > problem and the discussion it engendered on the lkml.
Should say:
The large amount of text in the explanation below is due to the nature of the problem and the discussion engendered on lkml by my first submission.
> This patch-set detects the problem by comparing an MMCONFIG > read to a Legacy PCI config read of the vendor/device dword > of every device discovered during the PCI probing sequence.
Actually, the patch doesn't do a pci config read of EVERY device discovered on every bus. Only on buses above a number defined by PCI_MMCFG_MAX_CHECK_BUS and whose parent bus's pci_bus.ops field points to pci_root_ops, which are mmconfig access routines in systems in which mmconfig is the default mechanism.
In such cases where the parent bus pci_bus.ops field points to pci_legacy_ops, the current bus does not need to be probed, since its own pci_bus.ops field will inherit the pointer to pci_legacy_ops from its parent.
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