Re: [PATCH] pci/pcie: Avoid unnecessary PCIe link retrains

From: Kenji Kaneshige
Date: Thu Nov 05 2009 - 21:48:42 EST

Matthew Wilcox wrote:
On Thu, Nov 05, 2009 at 12:05:11PM +0900, Kenji Kaneshige wrote:
There are a lot of codes that searches PCI express capability offset
in the PCI configuration space using pci_find_capability(). Caching it
in the struct pci_dev will reduce unncecessary search. This patch adds
an additional 'pcie_cap' fields into struct pci_dev, which is
initialized at pci device scan time (in set_pcie_port_type()).

I think adding this should imply the removal of ->is_pcie. pcie_cap == 0
means !is_pcie.


But, as you know, we need to change users of is_pcie (including some
adapter card drivers) before removing it.

Kenji Kaneshige

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