1 files changed, 35 insertions, 1 deletions

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 6a3b5cae3a6e..64b91d6c5a5d 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1263,13 +1263,47 @@ static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
         return status;
 }
 
+static void choose_wakeup(struct usb_device *udev, pm_message_t msg)
+{
+        int                     w, i;
+        struct usb_interface    *intf;
+
+        /* Remote wakeup is needed only when we actually go to sleep.
+         * For things like FREEZE and QUIESCE, if the device is already
+         * autosuspended then its current wakeup setting is okay.
+         */
+        if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) {
+                if (udev->state != USB_STATE_SUSPENDED)
+                        udev->do_remote_wakeup = 0;
+                return;
+        }
+
+        /* If remote wakeup is permitted, see whether any interface drivers
+         * actually want it.
+         */
+        w = 0;
+        if (device_may_wakeup(&udev->dev) && udev->actconfig) {
+                for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+                        intf = udev->actconfig->interface[i];
+                        w |= intf->needs_remote_wakeup;
+                }
+        }
+
+        /* If the device is autosuspended with the wrong wakeup setting,
+         * autoresume now so the setting can be changed.
+         */
+        if (udev->state == USB_STATE_SUSPENDED && w != udev->do_remote_wakeup)
+                pm_runtime_resume(&udev->dev);
+        udev->do_remote_wakeup = w;
+}
+
 /* The device lock is held by the PM core */
 int usb_suspend(struct device *dev, pm_message_t msg)
 {
         struct usb_device       *udev = to_usb_device(dev);
 
         do_unbind_rebind(udev, DO_UNBIND);
-        udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
+        choose_wakeup(udev, msg);
         return usb_suspend_both(udev, msg);
 }