[PATCH] USB: central handling for host controllers that were reset during suspend...

[linux-2.6] / drivers / usb / core / hub.c

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index f78bd124d2906e57b099b5910428f9a15e3b8170..5faf7edd73cb252295af3949f38862a015b14624 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1039,6 +1039,39 @@ void usb_set_device_state(struct usb_device *udev,
 EXPORT_SYMBOL(usb_set_device_state);
 
 
+#ifdef CONFIG_PM
+
+/**
+ * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
+ * @rhdev: struct usb_device for the root hub
+ *
+ * The USB host controller driver calls this function when its root hub
+ * is resumed and Vbus power has been interrupted or the controller
+ * has been reset.  The routine marks all the children of the root hub
+ * as NOTATTACHED and marks logical connect-change events on their ports.
+ */
+void usb_root_hub_lost_power(struct usb_device *rhdev)
+{
+       struct usb_hub *hub;
+       int port1;
+       unsigned long flags;
+
+       dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
+       spin_lock_irqsave(&device_state_lock, flags);
+       hub = hdev_to_hub(rhdev);
+       for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
+               if (rhdev->children[port1 - 1]) {
+                       recursively_mark_NOTATTACHED(
+                                       rhdev->children[port1 - 1]);
+                       set_bit(port1, hub->change_bits);
+               }
+       }
+       spin_unlock_irqrestore(&device_state_lock, flags);
+}
+EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
+
+#endif
+
 static void choose_address(struct usb_device *udev)
 {
        int             devnum;