s390/pci: set error state for unavailable functions

If we receive a notification that a pci function became unavailable we clean
up by removing the pci device. This can confuse the driver since the function
is already unaccessible. Improve this situation by setting an appropriate
error_state.

Reviewed-by: Gerald Schaefer <[email protected]>
Signed-off-by: Sebastian Ott <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>

Author: Sebastian Ott

arch/s390/pci/pci_event.c

@@ -102,8 +102,12 @@ static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
 
 		break;
 	case 0x0304: /* Configured -> Standby */
-		if (pdev)
+		if (pdev) {
+			/* Give the driver a hint that the function is
+			 * already unusable. */
+			pdev->error_state = pci_channel_io_perm_failure;
 			pci_stop_and_remove_bus_device(pdev);
+		}
 
 		zpci_disable_device(zdev);
 		zdev->state = ZPCI_FN_STATE_STANDBY;