X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fusb%2Fcore%2Fhub.c;h=5faf7edd73cb252295af3949f38862a015b14624;hb=1c50c317e2e7f15427149cbc216a63366468710e;hp=f78bd124d2906e57b099b5910428f9a15e3b8170;hpb=8364d6b0be2dbbf162c6aea79615b5025a0d67c2;p=linux-2.6

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index f78bd124d2..5faf7edd73 100644
--- 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;