ionic: rearrange reset and bus-master control

We can prevent potential incorrect DMA access attempts from the
NIC by enabling bus-master after the reset, and by disabling
bus-master earlier in cleanup.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c

@@ -247,19 +247,19 @@ static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		goto err_out_pci_disable_device;
 	}
 
-	pci_set_master(pdev);
 	pcie_print_link_status(pdev);
 
 	err = ionic_map_bars(ionic);
 	if (err)
-		goto err_out_pci_clear_master;
+		goto err_out_pci_disable_device;
 
 	/* Configure the device */
 	err = ionic_setup(ionic);
 	if (err) {
 		dev_err(dev, "Cannot setup device: %d, aborting\n", err);
 		goto err_out_unmap_bars;
 	}
+	pci_set_master(pdev);
 
 	err = ionic_identify(ionic);
 	if (err) {
@@ -350,6 +350,7 @@ static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	ionic_reset(ionic);
 err_out_teardown:
 	ionic_dev_teardown(ionic);
+	pci_clear_master(pdev);
 	/* Don't fail the probe for these errors, keep
 	 * the hw interface around for inspection
 	 */
@@ -358,8 +359,6 @@ static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 err_out_unmap_bars:
 	ionic_unmap_bars(ionic);
 	pci_release_regions(pdev);
-err_out_pci_clear_master:
-	pci_clear_master(pdev);
 err_out_pci_disable_device:
 	pci_disable_device(pdev);
 err_out_debugfs_del_dev:
@@ -389,9 +388,9 @@ static void ionic_remove(struct pci_dev *pdev)
 	ionic_port_reset(ionic);
 	ionic_reset(ionic);
 	ionic_dev_teardown(ionic);
+	pci_clear_master(pdev);
 	ionic_unmap_bars(ionic);
 	pci_release_regions(pdev);
-	pci_clear_master(pdev);
 	pci_disable_device(pdev);
 	ionic_debugfs_del_dev(ionic);
 	mutex_destroy(&ionic->dev_cmd_lock);