PM: Do not create wakeup sysfs files for devices that cannot wake up (v2)

Commit Message

Rafael Wysocki Feb. 6, 2011, 6:53 p.m. UTC

None

Patch

Index: linux-2.6/drivers/usb/core/hub.c
===================================================================
--- linux-2.6.orig/drivers/usb/core/hub.c
+++ linux-2.6/drivers/usb/core/hub.c
@@ -1465,6 +1465,7 @@  void usb_set_device_state(struct usb_dev
                enum usb_device_state new_state)
 {
        unsigned long flags;
+       int wakeup = -1;
 
        spin_lock_irqsave(&device_state_lock, flags);
        if (udev->state == USB_STATE_NOTATTACHED)
@@ -1479,11 +1480,10 @@  void usb_set_device_state(struct usb_dev
                                        || new_state == USB_STATE_SUSPENDED)
                                ;       /* No change to wakeup settings */
                        else if (new_state == USB_STATE_CONFIGURED)
-                               device_set_wakeup_capable(&udev->dev,
-                                       (udev->actconfig->desc.bmAttributes
-                                        & USB_CONFIG_ATT_WAKEUP));
+                               wakeup = udev->actconfig->desc.bmAttributes
+                                        & USB_CONFIG_ATT_WAKEUP;
                        else
-                               device_set_wakeup_capable(&udev->dev, 0);
+                               wakeup = 0;
                }
                if (udev->state == USB_STATE_SUSPENDED &&
                        new_state != USB_STATE_SUSPENDED)
@@ -1495,6 +1495,8 @@  void usb_set_device_state(struct usb_dev
        } else
                recursively_mark_NOTATTACHED(udev);
        spin_unlock_irqrestore(&device_state_lock, flags);
+       if (wakeup >= 0)
+               device_set_wakeup_capable(&udev->dev, wakeup);
 }
 EXPORT_SYMBOL_GPL(usb_set_device_state);