sky2: remove unnecessary reads of PCI_CAP_ID_EXP

The PCIE capability offset is saved during PCI bus walking.  It will
remove an unnecessary search in the PCI configuration space if this
value is referenced instead of reacquiring it.  Also, pci_is_pcie is a
better way of determining if the device is PCIE or not (as it uses the
same saved PCIE capability offset).

Signed-off-by: Jon Mason <jdmason@kudzu.us>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sky2.c

@@ -1449,7 +1449,7 @@ static void sky2_rx_start(struct sky2_port *sky2)
 	sky2_qset(hw, rxq);
 
 	/* On PCI express lowering the watermark gives better performance */
-	if (pci_find_capability(hw->pdev, PCI_CAP_ID_EXP))
+	if (pci_is_pcie(hw->pdev))
 		sky2_write32(hw, Q_ADDR(rxq, Q_WM), BMU_WM_PEX);
 
 	/* These chips have no ram buffer?
@@ -3072,7 +3072,7 @@ static void sky2_reset(struct sky2_hw *hw)
 {
 	struct pci_dev *pdev = hw->pdev;
 	u16 status;
-	int i, cap;
+	int i;
 	u32 hwe_mask = Y2_HWE_ALL_MASK;
 
 	/* disable ASF */
@@ -3108,8 +3108,7 @@ static void sky2_reset(struct sky2_hw *hw)
 
 	sky2_write8(hw, B0_CTST, CS_MRST_CLR);
 
-	cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
-	if (cap) {
+	if (pci_is_pcie(pdev)) {
 		sky2_write32(hw, Y2_CFG_AER + PCI_ERR_UNCOR_STATUS,
 			     0xfffffffful);
 
@@ -3171,11 +3170,11 @@ static void sky2_reset(struct sky2_hw *hw)
 
 		/* check if PSMv2 was running before */
 		reg = sky2_pci_read16(hw, PSM_CONFIG_REG3);
-		if (reg & PCI_EXP_LNKCTL_ASPMC) {
-			cap = pci_find_capability(pdev, PCI_CAP_ID_EXP);
+		if (reg & PCI_EXP_LNKCTL_ASPMC)
 			/* restore the PCIe Link Control register */
-			sky2_pci_write16(hw, cap + PCI_EXP_LNKCTL, reg);
-		}
+			sky2_pci_write16(hw, pdev->pcie_cap + PCI_EXP_LNKCTL,
+					 reg);
+
 		sky2_write8(hw, B2_TST_CTRL1, TST_CFG_WRITE_OFF);
 
 		/* re-enable PEX PM in PEX PHY debug reg. 8 (clear bit 12) */