USB: update last_busy field correctly

This patch (as966) fixes a bug in the autosuspend code.  The last_busy
field should be updated whenever any event occurs, not just events
that cause an autosuspend or an autoresume.

This partially fixes Bugzilla #8892.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/driver.c

@@ -1224,6 +1224,8 @@ static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
 	udev->auto_pm = 1;
 	udev->pm_usage_cnt += inc_usage_cnt;
 	WARN_ON(udev->pm_usage_cnt < 0);
+	if (inc_usage_cnt)
+		udev->last_busy = jiffies;
 	if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) {
 		if (udev->state == USB_STATE_SUSPENDED)
 			status = usb_resume_both(udev);
@@ -1232,8 +1234,6 @@ static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
 		else if (inc_usage_cnt)
 			udev->last_busy = jiffies;
 	} else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) {
-		if (inc_usage_cnt)
-			udev->last_busy = jiffies;
 		status = usb_suspend_both(udev, PMSG_SUSPEND);
 	}
 	usb_pm_unlock(udev);
@@ -1342,16 +1342,15 @@ static int usb_autopm_do_interface(struct usb_interface *intf,
 	else {
 		udev->auto_pm = 1;
 		intf->pm_usage_cnt += inc_usage_cnt;
+		udev->last_busy = jiffies;
 		if (inc_usage_cnt >= 0 && intf->pm_usage_cnt > 0) {
 			if (udev->state == USB_STATE_SUSPENDED)
 				status = usb_resume_both(udev);
 			if (status != 0)
 				intf->pm_usage_cnt -= inc_usage_cnt;
-			else if (inc_usage_cnt)
+			else
 				udev->last_busy = jiffies;
 		} else if (inc_usage_cnt <= 0 && intf->pm_usage_cnt <= 0) {
-			if (inc_usage_cnt)
-				udev->last_busy = jiffies;
 			status = usb_suspend_both(udev, PMSG_SUSPEND);
 		}
 	}