commit 786e22885d9959fda0473ace5a61cb11620fba9b
author Yijing Wang <wangyijing@huawei.com> Tue Jul 24 17:20:02 2012 +0800
committer Jiang Liu <liuj97@gmail.com> Mon Aug 20 22:32:20 2012 +0800
tree bfd70885b7d52deaef338ee212bf66ac682f8e42
parent 0d7614f09c1ebdbaa1599a5aba7593f147bf96ee

PCI: Add pcie_flags_reg to cache PCIe capabilities register

Since PCI Express Capabilities Register is read only, cache its value
into struct pci_dev to avoid repeatedly calling pci_read_config_*().

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/probe.c

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6c143b4..ba4d855 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -929,7 +929,8 @@
 	pdev->is_pcie = 1;
 	pdev->pcie_cap = pos;
 	pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, &reg16);
-	pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
+	pdev->pcie_flags_reg = reg16;
+	pdev->pcie_type = pci_pcie_type(pdev);
 	pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, &reg16);
 	pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
 }