PCI: use better error return values in aer_inject

Replaced some error return values in aer_inject. Use -ENODEV when we
can't find a device and -ENOTTY when the device does not support PCIe AER.

Acked-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/pcie/aer/aer_inject.c

@@ -326,23 +326,23 @@ static int aer_inject(struct aer_error_inj *einj)
 
 	dev = pci_get_domain_bus_and_slot((int)einj->domain, einj->bus, devfn);
 	if (!dev)
-		return -EINVAL;
+		return -ENODEV;
 	rpdev = pcie_find_root_port(dev);
 	if (!rpdev) {
-		ret = -EINVAL;
+		ret = -ENOTTY;
 		goto out_put;
 	}
 
 	pos_cap_err = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 	if (!pos_cap_err) {
-		ret = -EIO;
+		ret = -ENOTTY;
 		goto out_put;
 	}
 	pci_read_config_dword(dev, pos_cap_err + PCI_ERR_UNCOR_SEVER, &sever);
 
 	rp_pos_cap_err = pci_find_ext_capability(rpdev, PCI_EXT_CAP_ID_ERR);
 	if (!rp_pos_cap_err) {
-		ret = -EIO;
+		ret = -ENOTTY;
 		goto out_put;
 	}