hub driver: improve use of #ifdef

This patch (as736) makes the hub driver more readable by improving the
usage of "#ifdef CONFIG_PM" and "#ifdef CONFIG_USB_SUSPEND".
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/hub.c

@@ -1072,7 +1072,7 @@ void usb_root_hub_lost_power(struct usb_device *rhdev)
 }
 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
 
-#endif
+#endif	/* CONFIG_PM */
 
 static void choose_address(struct usb_device *udev)
 {
@@ -1471,6 +1471,7 @@ static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
  	kick_khubd(hub);
 }
 
+#ifdef	CONFIG_PM
 
 #ifdef	CONFIG_USB_SUSPEND
 
@@ -1569,8 +1570,6 @@ static int __usb_port_suspend (struct usb_device *udev, int port1)
 	return status;
 }
 
-#endif
-
 /*
  * usb_port_suspend - suspend a usb device's upstream port
  * @udev: device that's no longer in active use
@@ -1593,11 +1592,7 @@ static int __usb_port_suspend (struct usb_device *udev, int port1)
  */
 int usb_port_suspend(struct usb_device *udev)
 {
-#ifdef	CONFIG_USB_SUSPEND
 	return __usb_port_suspend(udev, udev->portnum);
-#else
-	return 0;
-#endif
 }
 
 /*
@@ -1661,8 +1656,6 @@ static int finish_port_resume(struct usb_device *udev)
 	return status;
 }
 
-#ifdef	CONFIG_USB_SUSPEND
-
 static int
 hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
 {
@@ -1722,8 +1715,6 @@ hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
 	return status;
 }
 
-#endif
-
 /*
  * usb_port_resume - re-activate a suspended usb device's upstream port
  * @udev: device to re-activate
@@ -1739,17 +1730,15 @@ hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
  */
 int usb_port_resume(struct usb_device *udev)
 {
-	int	status = 0;
+	int	status;
 
 	/* we change the device's upstream USB link,
 	 * but root hubs have no upstream USB link.
 	 */
 	if (udev->parent) {
-#ifdef	CONFIG_USB_SUSPEND
 		// NOTE this fails if parent is also suspended...
 		status = hub_port_resume(hdev_to_hub(udev->parent),
 				udev->portnum, udev);
-#endif
 	} else
 		status = finish_port_resume(udev);
 	if (status < 0)
@@ -1761,8 +1750,6 @@ static int remote_wakeup(struct usb_device *udev)
 {
 	int	status = 0;
 
-#ifdef	CONFIG_USB_SUSPEND
-
 	/* don't repeat RESUME sequence if this device
 	 * was already woken up by some other task
 	 */
@@ -1777,10 +1764,42 @@ static int remote_wakeup(struct usb_device *udev)
 	if (status == 0)
 		usb_resume_both(udev);
 	usb_unlock_device(udev);
-#endif
 	return status;
 }
 
+#else	/* CONFIG_USB_SUSPEND */
+
+/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
+
+int usb_port_suspend(struct usb_device *udev)
+{
+	return 0;
+}
+
+static inline int
+finish_port_resume(struct usb_device *udev)
+{
+	return 0;
+}
+
+static inline int
+hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
+{
+	return 0;
+}
+
+int usb_port_resume(struct usb_device *udev)
+{
+	return 0;
+}
+
+static inline int remote_wakeup(struct usb_device *udev)
+{
+	return 0;
+}
+
+#endif
+
 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
 {
 	struct usb_hub		*hub = usb_get_intfdata (intf);
@@ -1854,6 +1873,15 @@ static int hub_resume(struct usb_interface *intf)
 	return 0;
 }
 
+#else	/* CONFIG_PM */
+
+static inline int remote_wakeup(struct usb_device *udev)
+{
+	return 0;
+}
+
+#endif
+
 void usb_suspend_root_hub(struct usb_device *hdev)
 {
 	struct usb_hub *hub = hdev_to_hub(hdev);

drivers/usb/core/usb.h

@@ -30,11 +30,22 @@ extern void usb_major_cleanup(void);
 extern int usb_host_init(void);
 extern void usb_host_cleanup(void);
 
+#ifdef	CONFIG_PM
+
 extern int usb_suspend_both(struct usb_device *udev, pm_message_t msg);
 extern int usb_resume_both(struct usb_device *udev);
 extern int usb_port_suspend(struct usb_device *dev);
 extern int usb_port_resume(struct usb_device *dev);
 
+#else
+
+#define usb_suspend_both(udev, msg)	0
+#define usb_resume_both(udev)		0
+#define usb_port_suspend(dev)		0
+#define usb_port_resume(dev)		0
+
+#endif
+
 extern struct bus_type usb_bus_type;
 extern struct usb_device_driver usb_generic_driver;