PCI/AER: Use cached AER Capability offset

Replace pci_find_ext_capability(..., PCI_EXT_CAP_ID_ERR) calls with
pci_dev->aer_cap.

pci_dev->aer_cap is initialized in pci_init_capabilities(), which happens
before any of these users of the AER Capability.

Signed-off-by: Frederick Lawler <fred@fredlawl.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/pcie/aer/aer_inject.c

@@ -344,7 +344,7 @@ static int aer_inject(struct aer_error_inj *einj)
 		goto out_put;
 	}
 
-	pos_cap_err = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+	pos_cap_err = dev->aer_cap;
 	if (!pos_cap_err) {
 		pci_err(dev, "aer_inject: Device doesn't support AER\n");
 		ret = -EPROTONOSUPPORT;
@@ -355,7 +355,7 @@ static int aer_inject(struct aer_error_inj *einj)
 	pci_read_config_dword(dev, pos_cap_err + PCI_ERR_UNCOR_MASK,
 			      &uncor_mask);
 
-	rp_pos_cap_err = pci_find_ext_capability(rpdev, PCI_EXT_CAP_ID_ERR);
+	rp_pos_cap_err = rpdev->aer_cap;
 	if (!rp_pos_cap_err) {
 		pci_err(rpdev, "aer_inject: Root port doesn't support AER\n");
 		ret = -EPROTONOSUPPORT;

drivers/pci/pcie/aer/ecrc.c

@@ -40,7 +40,7 @@ static int enable_ecrc_checking(struct pci_dev *dev)
 	if (!pci_is_pcie(dev))
 		return -ENODEV;
 
-	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+	pos = dev->aer_cap;
 	if (!pos)
 		return -ENODEV;
 
@@ -68,7 +68,7 @@ static int disable_ecrc_checking(struct pci_dev *dev)
 	if (!pci_is_pcie(dev))
 		return -ENODEV;
 
-	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+	pos = dev->aer_cap;
 	if (!pos)
 		return -ENODEV;
 

drivers/pci/pcie/portdrv_core.c

@@ -40,7 +40,7 @@ static void release_pcie_device(struct device *dev)
 static int pcie_message_numbers(struct pci_dev *dev, int mask,
 				u32 *pme, u32 *aer, u32 *dpc)
 {
-	u32 nvec = 0, pos, reg32;
+	u32 nvec = 0, pos;
 	u16 reg16;
 
 	/*
@@ -56,8 +56,11 @@ static int pcie_message_numbers(struct pci_dev *dev, int mask,
 		nvec = *pme + 1;
 	}
 
+#ifdef CONFIG_PCIEAER
 	if (mask & PCIE_PORT_SERVICE_AER) {
-		pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+		u32 reg32;
+
+		pos = dev->aer_cap;
 		if (pos) {
 			pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS,
 					      &reg32);
@@ -65,6 +68,7 @@ static int pcie_message_numbers(struct pci_dev *dev, int mask,
 			nvec = max(nvec, *aer + 1);
 		}
 	}
+#endif
 
 	if (mask & PCIE_PORT_SERVICE_DPC) {
 		pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC);
@@ -207,8 +211,9 @@ static int get_port_device_capability(struct pci_dev *dev)
 			  PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_HPIE);
 	}
 
-	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR) &&
-	    pci_aer_available() && (pcie_ports_native || host->native_aer)) {
+#ifdef CONFIG_PCIEAER
+	if (dev->aer_cap && pci_aer_available() &&
+	    (pcie_ports_native || host->native_aer)) {
 		services |= PCIE_PORT_SERVICE_AER;
 
 		/*
@@ -217,6 +222,7 @@ static int get_port_device_capability(struct pci_dev *dev)
 		 */
 		pci_disable_pcie_error_reporting(dev);
 	}
+#endif
 
 	/*
 	 * Root ports are capable of generating PME too.  Root Complex