USB: consolidate remote wakeup routines

This patch (as1324) makes a small change to the code used for remote
wakeup of root hubs.  hcd_resume_work() now calls the hub driver's
remote-wakeup routine instead of implementing its own version.

The patch is complicated by the need to rename remote_wakeup() to
usb_remote_wakeup(), make it non-static, and declare it in a header
file.  There's also the additional complication required to make
everything work when CONFIG_PM isn't set; the do-nothing inline
routine had to be moved into the header file.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/hcd.c

@@ -1865,8 +1865,7 @@ static void hcd_resume_work(struct work_struct *work)
 	struct usb_device *udev = hcd->self.root_hub;
 
 	usb_lock_device(udev);
-	usb_mark_last_busy(udev);
-	usb_external_resume_device(udev, PMSG_REMOTE_RESUME);
+	usb_remote_wakeup(udev);
 	usb_unlock_device(udev);
 }
 

drivers/usb/core/hub.c

@@ -2399,7 +2399,7 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 }
 
 /* caller has locked udev */
-static int remote_wakeup(struct usb_device *udev)
+int usb_remote_wakeup(struct usb_device *udev)
 {
 	int	status = 0;
 
@@ -2443,7 +2443,7 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 	return status;
 }
 
-static inline int remote_wakeup(struct usb_device *udev)
+int usb_remote_wakeup(struct usb_device *udev)
 {
 	return 0;
 }
@@ -2514,11 +2514,6 @@ EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
 
 #else	/* CONFIG_PM */
 
-static inline int remote_wakeup(struct usb_device *udev)
-{
-	return 0;
-}
-
 #define hub_suspend		NULL
 #define hub_resume		NULL
 #define hub_reset_resume	NULL
@@ -3017,7 +3012,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 			/* For a suspended device, treat this as a
 			 * remote wakeup event.
 			 */
-			status = remote_wakeup(udev);
+			status = usb_remote_wakeup(udev);
 #endif
 
 		} else {
@@ -3363,7 +3358,7 @@ static void hub_events(void)
 					msleep(10);
 
 					usb_lock_device(udev);
-					ret = remote_wakeup(hdev->
+					ret = usb_remote_wakeup(hdev->
 							children[i-1]);
 					usb_unlock_device(udev);
 					if (ret < 0)

drivers/usb/core/usb.h

@@ -63,6 +63,7 @@ extern int usb_external_suspend_device(struct usb_device *udev,
 		pm_message_t msg);
 extern int usb_external_resume_device(struct usb_device *udev,
 		pm_message_t msg);
+extern int usb_remote_wakeup(struct usb_device *dev);
 
 static inline void usb_pm_lock(struct usb_device *udev)
 {
@@ -86,6 +87,11 @@ static inline int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 	return 0;
 }
 
+static inline int usb_remote_wakeup(struct usb_device *udev)
+{
+	return 0;
+}
+
 static inline void usb_pm_lock(struct usb_device *udev) {}
 static inline void usb_pm_unlock(struct usb_device *udev) {}