* Re: [PATCH 0/5]PCI: x86 MMCONFIG - a couple of corrections to the preamble
[not found] <20071222024044.26026.1461.sendpatchset@dhcp83-188.boston.redhat.com>
@ 2007-12-22 5:29 ` Tony Camuso
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From: Tony Camuso @ 2007-12-22 5:29 UTC (permalink / raw)
To: gregkh, linux-kernel, linux-pci, prarit, tcamuso
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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