s390/pci: clean up left over special treatment for function zero

Prior to commit 960ac362 ("s390/pci: allow zPCI zbus without
a function zero") enabling and scanning a PCI function had to
potentially be postponed until the function with devfn zero on that bus
was plugged. While the commit removed the waiting itself extra code to
scan all functions on the PCI bus once function zero appeared was
missed. Remove that code and the outdated comments about waiting for
function zero.
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20230306151014.60913-5-schnelle@linux.ibm.comSigned-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/pci/pci.c

@@ -870,32 +870,15 @@ bool zpci_is_device_configured(struct zpci_dev *zdev)
  * @fh: The general function handle supplied by the platform
  *
  * Given a device in the configuration state Configured, enables, scans and
- * adds it to the common code PCI subsystem if possible. If the PCI device is
- * parked because we can not yet create a PCI bus because we have not seen
- * function 0, it is ignored but will be scanned once function 0 appears.
- * If any failure occurs, the zpci_dev is left disabled.
+ * adds it to the common code PCI subsystem if possible. If any failure occurs,
+ * the zpci_dev is left disabled.
  *
  * Return: 0 on success, or an error code otherwise
  */
 int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
 {
-	int rc;
-
 	zpci_update_fh(zdev, fh);
-	/* the PCI function will be scanned once function 0 appears */
-	if (!zdev->zbus->bus)
-		return 0;
-
-	/* For function 0 on a multi-function bus scan whole bus as we might
-	 * have to pick up existing functions waiting for it to allow creating
-	 * the PCI bus
-	 */
-	if (zdev->devfn == 0 && zdev->zbus->multifunction)
-		rc = zpci_bus_scan_bus(zdev->zbus);
-	else
-		rc = zpci_bus_scan_device(zdev);
-
-	return rc;
+	return zpci_bus_scan_device(zdev);
 }
 
 /**

arch/s390/pci/pci_bus.c

@@ -131,11 +131,8 @@ void zpci_bus_remove_device(struct zpci_dev *zdev, bool set_error)
  * @zbus: the zbus to be scanned
  *
  * Enables and scans all PCI functions on the bus making them available to the
- * common PCI code. If there is no function 0 on the zbus nothing is scanned. If
- * a function does not have a slot yet because it was added to the zbus before
- * function 0 the slot is created. If a PCI function fails to be initialized
- * an error will be returned but attempts will still be made for all other
- * functions on the bus.
+ * common PCI code. If a PCI function fails to be initialized an error will be
+ * returned but attempts will still be made for all other functions on the bus.
  *
  * Return: 0 on success, an error value otherwise
  */