IB/mthca: Use PCI Express Capability accessors

Use PCI Express Capability access functions to simplify mthca driver.
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/mthca/mthca_reset.c

@@ -241,7 +241,7 @@ int mthca_reset(struct mthca_dev *mdev)
 
 	if (hca_pcie_cap) {
 		devctl = hca_header[(hca_pcie_cap + PCI_EXP_DEVCTL) / 4];
-		if (pci_write_config_word(mdev->pdev, hca_pcie_cap + PCI_EXP_DEVCTL,
+		if (pcie_capability_write_word(mdev->pdev, PCI_EXP_DEVCTL,
 					       devctl)) {
 			err = -ENODEV;
 			mthca_err(mdev, "Couldn't restore HCA PCI Express "
@@ -249,7 +249,7 @@ int mthca_reset(struct mthca_dev *mdev)
 			goto out;
 		}
 		linkctl = hca_header[(hca_pcie_cap + PCI_EXP_LNKCTL) / 4];
-		if (pci_write_config_word(mdev->pdev, hca_pcie_cap + PCI_EXP_LNKCTL,
+		if (pcie_capability_write_word(mdev->pdev, PCI_EXP_LNKCTL,
 					       linkctl)) {
 			err = -ENODEV;
 			mthca_err(mdev, "Couldn't restore HCA PCI Express "