[RFC PATCH 13/14] r8169/PCI: use PCIe cap access functions to simplify implementation

[Jiang Liu <liuj97@xxxxxxxxx>]

From: Jiang Liu <jiang.liu@xxxxxxxxxx>

Use PCIe cap access functions to simplify r8169 driver implementation

Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx>
Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
---
 drivers/net/ethernet/realtek/r8169.c |   38 +++++++++++-----------------------
 1 file changed, 12 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 9757ce3..c9a7146 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -807,14 +807,11 @@ static void rtl_unlock_work(struct rtl8169_private *tp)
 
 static void rtl_tx_performance_tweak(struct pci_dev *pdev, u16 force)
 {
-	int cap = pci_pcie_cap(pdev);
+	u16 ctl;
 
-	if (cap) {
-		u16 ctl;
-
-		pci_read_config_word(pdev, cap + PCI_EXP_DEVCTL, &ctl);
+	if (!pci_pcie_cap_read_word(pdev, PCI_EXP_DEVCTL, &ctl)) {
 		ctl = (ctl & ~PCI_EXP_DEVCTL_READRQ) | force;
-		pci_write_config_word(pdev, cap + PCI_EXP_DEVCTL, ctl);
+		pci_pcie_cap_write_word(pdev, PCI_EXP_DEVCTL, ctl);
 	}
 }
 
@@ -4504,27 +4501,21 @@ static void rtl_ephy_init(void __iomem *ioaddr, const struct ephy_info *e, int l
 
 static void rtl_disable_clock_request(struct pci_dev *pdev)
 {
-	int cap = pci_pcie_cap(pdev);
-
-	if (cap) {
-		u16 ctl;
+	u16 ctl;
 
-		pci_read_config_word(pdev, cap + PCI_EXP_LNKCTL, &ctl);
+	if (!pci_pcie_cap_read_word(pdev, PCI_EXP_LNKCTL, &ctl)) {
 		ctl &= ~PCI_EXP_LNKCTL_CLKREQ_EN;
-		pci_write_config_word(pdev, cap + PCI_EXP_LNKCTL, ctl);
+		pci_pcie_cap_write_word(pdev, PCI_EXP_LNKCTL, ctl);
 	}
 }
 
 static void rtl_enable_clock_request(struct pci_dev *pdev)
 {
-	int cap = pci_pcie_cap(pdev);
-
-	if (cap) {
-		u16 ctl;
+	u16 ctl;
 
-		pci_read_config_word(pdev, cap + PCI_EXP_LNKCTL, &ctl);
+	if (!pci_pcie_cap_read_word(pdev, PCI_EXP_LNKCTL, &ctl)) {
 		ctl |= PCI_EXP_LNKCTL_CLKREQ_EN;
-		pci_write_config_word(pdev, cap + PCI_EXP_LNKCTL, ctl);
+		pci_pcie_cap_write_word(pdev, PCI_EXP_LNKCTL, ctl);
 	}
 }
 
@@ -5132,14 +5123,9 @@ static void rtl_hw_start_8101(struct net_device *dev)
 		tp->event_slow &= ~RxFIFOOver;
 
 	if (tp->mac_version == RTL_GIGA_MAC_VER_13 ||
-	    tp->mac_version == RTL_GIGA_MAC_VER_16) {
-		int cap = pci_pcie_cap(pdev);
-
-		if (cap) {
-			pci_write_config_word(pdev, cap + PCI_EXP_DEVCTL,
-					      PCI_EXP_DEVCTL_NOSNOOP_EN);
-		}
-	}
+	    tp->mac_version == RTL_GIGA_MAC_VER_16)
+		pci_pcie_cap_write_word(pdev, PCI_EXP_DEVCTL,
+					PCI_EXP_DEVCTL_NOSNOOP_EN);
 
 	RTL_W8(Cfg9346, Cfg9346_Unlock);
 
-- 
1.7.9.5

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