PCI: cache PCIe capability offset

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()).

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 86c31ac454d1..233b3a092035 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -218,6 +218,7 @@ struct pci_dev {
         unsigned int    class;          /* 3 bytes: (base,sub,prog-if) */
         u8              revision;       /* PCI revision, low byte of class word */
         u8              hdr_type;       /* PCI header type (`multi' flag masked out) */
+        u8              pcie_cap;       /* PCI-E capability offset */
         u8              pcie_type;      /* PCI-E device/port type */
         u8              rom_base_reg;   /* which config register controls the ROM */
         u8              pin;            /* which interrupt pin this device uses */