Merge with Linus' kernel.

1 files changed, 265 insertions, 221 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index f78bd124d29..650d5ee5871 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -32,7 +32,7 @@
 #include "hub.h"
 
 /* Protect struct usb_device->state and ->children members
- * Note: Both are also protected by ->serialize, except that ->state can
+ * Note: Both are also protected by ->dev.sem, except that ->state can
  * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
 static DEFINE_SPINLOCK(device_state_lock);
 
@@ -515,6 +515,31 @@ static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
 	return ret;
 }
 
+
+/* caller has locked the hub device */
+static void hub_pre_reset(struct usb_hub *hub, int disable_ports)
+{
+	struct usb_device *hdev = hub->hdev;
+	int port1;
+
+	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
+		if (hdev->children[port1 - 1]) {
+			usb_disconnect(&hdev->children[port1 - 1]);
+			if (disable_ports)
+				hub_port_disable(hub, port1, 0);
+		}
+	}
+	hub_quiesce(hub);
+}
+
+/* caller has locked the hub device */
+static void hub_post_reset(struct usb_hub *hub)
+{
+	hub_activate(hub);
+	hub_power_on(hub);
+}
+
+
 static int hub_configure(struct usb_hub *hub,
 	struct usb_endpoint_descriptor *endpoint)
 {
@@ -677,26 +702,40 @@ static int hub_configure(struct usb_hub *hub,
 	 * and battery-powered root hubs (may provide just 8 mA).
 	 */
 	ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
-	if (ret < 0) {
+	if (ret < 2) {
 		message = "can't get hub status";
 		goto fail;
 	}
 	le16_to_cpus(&hubstatus);
 	if (hdev == hdev->bus->root_hub) {
-		struct usb_hcd *hcd =
-				container_of(hdev->bus, struct usb_hcd, self);
-
-		hub->power_budget = min(500u, hcd->power_budget) / 2;
+		if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
+			hub->mA_per_port = 500;
+		else {
+			hub->mA_per_port = hdev->bus_mA;
+			hub->limited_power = 1;
+		}
 	} else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
 		dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
 			hub->descriptor->bHubContrCurrent);
-		hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
-					/ 2;
+		hub->limited_power = 1;
+		if (hdev->maxchild > 0) {
+			int remaining = hdev->bus_mA -
+					hub->descriptor->bHubContrCurrent;
+
+			if (remaining < hdev->maxchild * 100)
+				dev_warn(hub_dev,
+					"insufficient power available "
+					"to use all downstream ports\n");
+			hub->mA_per_port = 100;		/* 7.2.1.1 */
+		}
+	} else {	/* Self-powered external hub */
+		/* FIXME: What about battery-powered external hubs that
+		 * provide less current per port? */
+		hub->mA_per_port = 500;
 	}
-	if (hub->power_budget)
-		dev_dbg(hub_dev, "%dmA bus power budget for children\n",
-			hub->power_budget * 2);
-
+	if (hub->mA_per_port < 500)
+		dev_dbg(hub_dev, "%umA bus power budget for each child\n",
+				hub->mA_per_port);
 
 	ret = hub_hub_status(hub, &hubstatus, &hubchange);
 	if (ret < 0) {
@@ -750,29 +789,10 @@ fail:
 
 static unsigned highspeed_hubs;
 
-/* Called after the hub driver is unbound from a hub with children */
-static void hub_remove_children_work(void *__hub)
-{
-	struct usb_hub		*hub = __hub;
-	struct usb_device	*hdev = hub->hdev;
-	int			i;
-
-	kfree(hub);
-
-	usb_lock_device(hdev);
-	for (i = 0; i < hdev->maxchild; ++i) {
-		if (hdev->children[i])
-			usb_disconnect(&hdev->children[i]);
-	}
-	usb_unlock_device(hdev);
-	usb_put_dev(hdev);
-}
-
 static void hub_disconnect(struct usb_interface *intf)
 {
 	struct usb_hub *hub = usb_get_intfdata (intf);
 	struct usb_device *hdev;
-	int n, port1;
 
 	usb_set_intfdata (intf, NULL);
 	hdev = hub->hdev;
@@ -780,7 +800,9 @@ static void hub_disconnect(struct usb_interface *intf)
 	if (hdev->speed == USB_SPEED_HIGH)
 		highspeed_hubs--;
 
-	hub_quiesce(hub);
+	/* Disconnect all children and quiesce the hub */
+	hub_pre_reset(hub, 1);
+
 	usb_free_urb(hub->urb);
 	hub->urb = NULL;
 
@@ -800,27 +822,7 @@ static void hub_disconnect(struct usb_interface *intf)
 		hub->buffer = NULL;
 	}
 
-	/* If there are any children then this is an unbind only, not a
-	 * physical disconnection.  The active ports must be disabled
-	 * and later on we must call usb_disconnect().  We can't call
-	 * it now because we may not hold the hub's device lock.
-	 */
-	n = 0;
-	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
-		if (hdev->children[port1 - 1]) {
-			++n;
-			hub_port_disable(hub, port1, 1);
-		}
-	}
-
-	if (n == 0)
-		kfree(hub);
-	else {
-		/* Reuse the hub->leds work_struct for our own purposes */
-		INIT_WORK(&hub->leds, hub_remove_children_work, hub);
-		schedule_work(&hub->leds);
-		usb_get_dev(hdev);
-	}
+	kfree(hub);
 }
 
 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
@@ -917,26 +919,6 @@ hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
 	}
 }
 
-/* caller has locked the hub device */
-static void hub_pre_reset(struct usb_hub *hub)
-{
-	struct usb_device *hdev = hub->hdev;
-	int i;
-
-	for (i = 0; i < hdev->maxchild; ++i) {
-		if (hdev->children[i])
-			usb_disconnect(&hdev->children[i]);
-	}
-	hub_quiesce(hub);
-}
-
-/* caller has locked the hub device */
-static void hub_post_reset(struct usb_hub *hub)
-{
-	hub_activate(hub);
-	hub_power_on(hub);
-}
-
 
 /* grab device/port lock, returning index of that port (zero based).
  * protects the upstream link used by this device from concurrent
@@ -964,24 +946,21 @@ static int locktree(struct usb_device *udev)
 	t = locktree(hdev);
 	if (t < 0)
 		return t;
-	for (t = 0; t < hdev->maxchild; t++) {
-		if (hdev->children[t] == udev) {
-			/* everything is fail-fast once disconnect
-			 * processing starts
-			 */
-			if (udev->state == USB_STATE_NOTATTACHED)
-				break;
 
-			/* when everyone grabs locks top->bottom,
-			 * non-overlapping work may be concurrent
-			 */
-			down(&udev->serialize);
-			up(&hdev->serialize);
-			return t + 1;
-		}
+	/* everything is fail-fast once disconnect
+	 * processing starts
+	 */
+	if (udev->state == USB_STATE_NOTATTACHED) {
+		usb_unlock_device(hdev);
+		return -ENODEV;
 	}
+
+	/* when everyone grabs locks top->bottom,
+	 * non-overlapping work may be concurrent
+	 */
+	usb_lock_device(udev);
 	usb_unlock_device(hdev);
-	return -ENODEV;
+	return udev->portnum;
 }
 
 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
@@ -1039,6 +1018,39 @@ 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;
@@ -1099,16 +1111,10 @@ void usb_disconnect(struct usb_device **pdev)
 	 * this quiesces everyting except pending urbs.
 	 */
 	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
-
-	/* lock the bus list on behalf of HCDs unregistering their root hubs */
-	if (!udev->parent) {
-		down(&usb_bus_list_lock);
-		usb_lock_device(udev);
-	} else
-		down(&udev->serialize);
-
 	dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
 
+	usb_lock_device(udev);
+
 	/* Free up all the children before we remove this device */
 	for (i = 0; i < USB_MAXCHILDREN; i++) {
 		if (udev->children[i])
@@ -1136,54 +1142,112 @@ void usb_disconnect(struct usb_device **pdev)
 	*pdev = NULL;
 	spin_unlock_irq(&device_state_lock);
 
-	if (!udev->parent) {
-		usb_unlock_device(udev);
-		up(&usb_bus_list_lock);
-	} else
-		up(&udev->serialize);
+	usb_unlock_device(udev);
 
 	device_unregister(&udev->dev);
 }
 
+static inline const char *plural(int n)
+{
+	return (n == 1 ? "" : "s");
+}
+
 static int choose_configuration(struct usb_device *udev)
 {
-	int c, i;
+	int i;
+	u16 devstatus;
+	int bus_powered;
+	int num_configs;
+	struct usb_host_config *c, *best;
+
+	/* If this fails, assume the device is bus-powered */
+	devstatus = 0;
+	usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
+	le16_to_cpus(&devstatus);
+	bus_powered = ((devstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0);
+	dev_dbg(&udev->dev, "device is %s-powered\n",
+			bus_powered ? "bus" : "self");
+
+	best = NULL;
+	c = udev->config;
+	num_configs = udev->descriptor.bNumConfigurations;
+	for (i = 0; i < num_configs; (i++, c++)) {
+		struct usb_interface_descriptor	*desc =
+				&c->intf_cache[0]->altsetting->desc;
+
+		/*
+		 * HP's USB bus-powered keyboard has only one configuration
+		 * and it claims to be self-powered; other devices may have
+		 * similar errors in their descriptors.  If the next test
+		 * were allowed to execute, such configurations would always
+		 * be rejected and the devices would not work as expected.
+		 */
+#if 0
+		/* Rule out self-powered configs for a bus-powered device */
+		if (bus_powered && (c->desc.bmAttributes &
+					USB_CONFIG_ATT_SELFPOWER))
+			continue;
+#endif
 
-	/* NOTE: this should interact with hub power budgeting */
+		/*
+		 * The next test may not be as effective as it should be.
+		 * Some hubs have errors in their descriptor, claiming
+		 * to be self-powered when they are really bus-powered.
+		 * We will overestimate the amount of current such hubs
+		 * make available for each port.
+		 *
+		 * This is a fairly benign sort of failure.  It won't
+		 * cause us to reject configurations that we should have
+		 * accepted.
+		 */
 
-	c = udev->config[0].desc.bConfigurationValue;
-	if (udev->descriptor.bNumConfigurations != 1) {
-		for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
-			struct usb_interface_descriptor	*desc;
+		/* Rule out configs that draw too much bus current */
+		if (c->desc.bMaxPower * 2 > udev->bus_mA)
+			continue;
 
-			/* heuristic:  Linux is more likely to have class
-			 * drivers, so avoid vendor-specific interfaces.
-			 */
-			desc = &udev->config[i].intf_cache[0]
-					->altsetting->desc;
-			if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC)
-				continue;
-			/* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS.
-			 * MSFT needs this to be the first config; never use
-			 * it as the default unless Linux has host-side RNDIS.
-			 * A second config would ideally be CDC-Ethernet, but
-			 * may instead be the "vendor specific" CDC subset
-			 * long used by ARM Linux for sa1100 or pxa255.
-			 */
-			if (desc->bInterfaceClass == USB_CLASS_COMM
-					&& desc->bInterfaceSubClass == 2
-					&& desc->bInterfaceProtocol == 0xff) {
-				c = udev->config[1].desc.bConfigurationValue;
-				continue;
-			}
-			c = udev->config[i].desc.bConfigurationValue;
+		/* If the first config's first interface is COMM/2/0xff
+		 * (MSFT RNDIS), rule it out unless Linux has host-side
+		 * RNDIS support. */
+		if (i == 0 && desc->bInterfaceClass == USB_CLASS_COMM
+				&& desc->bInterfaceSubClass == 2
+				&& desc->bInterfaceProtocol == 0xff) {
+#ifndef CONFIG_USB_NET_RNDIS
+			continue;
+#else
+			best = c;
+#endif
+		}
+
+		/* From the remaining configs, choose the first one whose
+		 * first interface is for a non-vendor-specific class.
+		 * Reason: Linux is more likely to have a class driver
+		 * than a vendor-specific driver. */
+		else if (udev->descriptor.bDeviceClass !=
+						USB_CLASS_VENDOR_SPEC &&
+				desc->bInterfaceClass !=
+						USB_CLASS_VENDOR_SPEC) {
+			best = c;
 			break;
 		}
+
+		/* If all the remaining configs are vendor-specific,
+		 * choose the first one. */
+		else if (!best)
+			best = c;
+	}
+
+	if (best) {
+		i = best->desc.bConfigurationValue;
 		dev_info(&udev->dev,
-			"configuration #%d chosen from %d choices\n",
-			c, udev->descriptor.bNumConfigurations);
+			"configuration #%d chosen from %d choice%s\n",
+			i, num_configs, plural(num_configs));
+	} else {
+		i = -1;
+		dev_warn(&udev->dev,
+			"no configuration chosen from %d choice%s\n",
+			num_configs, plural(num_configs));
 	}
-	return c;
+	return i;
 }
 
 #ifdef DEBUG
@@ -1210,8 +1274,8 @@ static inline void show_string(struct usb_device *udev, char *id, char *string)
  *
  * This is called with devices which have been enumerated, but not yet
  * configured.  The device descriptor is available, but not descriptors
- * for any device configuration.  The caller must have locked udev and
- * either the parent hub (if udev is a normal device) or else the
+ * for any device configuration.  The caller must have locked either
+ * the parent hub (if udev is a normal device) or else the
  * usb_bus_list_lock (if udev is a root hub).  The parent's pointer to
  * udev has already been installed, but udev is not yet visible through
  * sysfs or other filesystem code.
@@ -1221,8 +1285,7 @@ static inline void show_string(struct usb_device *udev, char *id, char *string)
  *
  * This call is synchronous, and may not be used in an interrupt context.
  *
- * Only the hub driver should ever call this; root hub registration
- * uses it indirectly.
+ * Only the hub driver or root-hub registrar should ever call this.
  */
 int usb_new_device(struct usb_device *udev)
 {
@@ -1269,15 +1332,9 @@ int usb_new_device(struct usb_device *udev)
 					le16_to_cpu(udev->config[0].desc.wTotalLength),
 					USB_DT_OTG, (void **) &desc) == 0) {
 			if (desc->bmAttributes & USB_OTG_HNP) {
-				unsigned		port1;
+				unsigned		port1 = udev->portnum;
 				struct usb_device	*root = udev->parent;
 				
-				for (port1 = 1; port1 <= root->maxchild;
-						port1++) {
-					if (root->children[port1-1] == udev)
-						break;
-				}
-
 				dev_info(&udev->dev,
 					"Dual-Role OTG device on %sHNP port\n",
 					(port1 == bus->otg_port)
@@ -1331,27 +1388,27 @@ int usb_new_device(struct usb_device *udev)
 	}
 	usb_create_sysfs_dev_files (udev);
 
+	usb_lock_device(udev);
+
 	/* choose and set the configuration. that registers the interfaces
 	 * with the driver core, and lets usb device drivers bind to them.
 	 */
 	c = choose_configuration(udev);
-	if (c < 0)
-		dev_warn(&udev->dev,
-				"can't choose an initial configuration\n");
-	else {
+	if (c >= 0) {
 		err = usb_set_configuration(udev, c);
 		if (err) {
 			dev_err(&udev->dev, "can't set config #%d, error %d\n",
 					c, err);
-			usb_remove_sysfs_dev_files(udev);
-			device_del(&udev->dev);
-			goto fail;
+			/* This need not be fatal.  The user can try to
+			 * set other configurations. */
 		}
 	}
 
 	/* USB device state == configured ... usable */
 	usb_notify_add_device(udev);
 
+	usb_unlock_device(udev);
+
 	return 0;
 
 fail:
@@ -1654,15 +1711,9 @@ static int __usb_suspend_device (struct usb_device *udev, int port1)
 int usb_suspend_device(struct usb_device *udev)
 {
 #ifdef	CONFIG_USB_SUSPEND
-	int	port1, status;
-
-	port1 = locktree(udev);
-	if (port1 < 0)
-		return port1;
-
-	status = __usb_suspend_device(udev, port1);
-	usb_unlock_device(udev);
-	return status;
+	if (udev->state == USB_STATE_NOTATTACHED)
+		return -ENODEV;
+	return __usb_suspend_device(udev, udev->portnum);
 #else
 	/* NOTE:  udev->state unchanged, it's not lying ... */
 	udev->dev.power.power_state = PMSG_SUSPEND;
@@ -1694,13 +1745,14 @@ static int finish_device_resume(struct usb_device *udev)
 	usb_set_device_state(udev, udev->actconfig
 			? USB_STATE_CONFIGURED
 			: USB_STATE_ADDRESS);
+	udev->dev.power.power_state = PMSG_ON;
 
  	/* 10.5.4.5 says be sure devices in the tree are still there.
  	 * For now let's assume the device didn't go crazy on resume,
 	 * and device drivers will know about any resume quirks.
 	 */
 	status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
-	if (status < 0)
+	if (status < 2)
 		dev_dbg(&udev->dev,
 			"gone after usb resume? status %d\n",
 			status);
@@ -1709,7 +1761,7 @@ static int finish_device_resume(struct usb_device *udev)
 		int		(*resume)(struct device *);
 
 		le16_to_cpus(&devstatus);
-		if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)
+		if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
 				&& udev->parent) {
 			status = usb_control_msg(udev,
 					usb_sndctrlpipe(udev, 0),
@@ -1729,8 +1781,14 @@ static int finish_device_resume(struct usb_device *udev)
 		 * may have a child resume event to deal with soon
 		 */
 		resume = udev->dev.bus->resume;
-		for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++)
-			(void) resume(&udev->actconfig->interface[i]->dev);
+		for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
+			struct device *dev =
+					&udev->actconfig->interface[i]->dev;
+
+			down(&dev->sem);
+			(void) resume(dev);
+			up(&dev->sem);
+		}
 		status = 0;
 
 	} else if (udev->devnum <= 0) {
@@ -1813,11 +1871,10 @@ hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
  */
 int usb_resume_device(struct usb_device *udev)
 {
-	int	port1, status;
+	int	status;
 
-	port1 = locktree(udev);
-	if (port1 < 0)
-		return port1;
+	if (udev->state == USB_STATE_NOTATTACHED)
+		return -ENODEV;
 
 #ifdef	CONFIG_USB_SUSPEND
 	/* selective resume of one downstream hub-to-device port */
@@ -1826,7 +1883,7 @@ int usb_resume_device(struct usb_device *udev)
 			// NOTE swsusp may bork us, device state being wrong...
 			// NOTE this fails if parent is also suspended...
 			status = hub_port_resume(hdev_to_hub(udev->parent),
-					port1, udev);
+					udev->portnum, udev);
 		} else
 			status = 0;
 	} else
@@ -1836,13 +1893,11 @@ int usb_resume_device(struct usb_device *udev)
 		dev_dbg(&udev->dev, "can't resume, status %d\n",
 			status);
 
-	usb_unlock_device(udev);
-
 	/* rebind drivers that had no suspend() */
 	if (status == 0) {
-		usb_lock_all_devices();
+		usb_unlock_device(udev);
 		bus_rescan_devices(&usb_bus_type);
-		usb_unlock_all_devices();
+		usb_lock_device(udev);
 	}
 	return status;
 }
@@ -1856,14 +1911,14 @@ static int remote_wakeup(struct usb_device *udev)
 	/* don't repeat RESUME sequence if this device
 	 * was already woken up by some other task
 	 */
-	down(&udev->serialize);
+	usb_lock_device(udev);
 	if (udev->state == USB_STATE_SUSPENDED) {
 		dev_dbg(&udev->dev, "RESUME (wakeup)\n");
 		/* TRSMRCY = 10 msec */
 		msleep(10);
 		status = finish_device_resume(udev);
 	}
-	up(&udev->serialize);
+	usb_unlock_device(udev);
 #endif
 	return status;
 }
@@ -1964,7 +2019,7 @@ static int hub_resume(struct usb_interface *intf)
 
 		if (!udev || status < 0)
 			continue;
-		down (&udev->serialize);
+		usb_lock_device(udev);
 		if (portstat & USB_PORT_STAT_SUSPEND)
 			status = hub_port_resume(hub, port1, udev);
 		else {
@@ -1975,7 +2030,7 @@ static int hub_resume(struct usb_interface *intf)
 				hub_port_logical_disconnect(hub, port1);
 			}
 		}
-		up(&udev->serialize);
+		usb_unlock_device(udev);
 	}
 	}
 #endif
@@ -2359,39 +2414,36 @@ hub_power_remaining (struct usb_hub *hub)
 {
 	struct usb_device *hdev = hub->hdev;
 	int remaining;
-	unsigned i;
+	int port1;
 
-	remaining = hub->power_budget;
-	if (!remaining)		/* self-powered */
+	if (!hub->limited_power)
 		return 0;
 
-	for (i = 0; i < hdev->maxchild; i++) {
-		struct usb_device	*udev = hdev->children[i];
-		int			delta, ceiling;
+	remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
+	for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
+		struct usb_device	*udev = hdev->children[port1 - 1];
+		int			delta;
 
 		if (!udev)
 			continue;
 
-		/* 100mA per-port ceiling, or 8mA for OTG ports */
-		if (i != (udev->bus->otg_port - 1) || hdev->parent)
-			ceiling = 50;
-		else
-			ceiling = 4;
-
+		/* Unconfigured devices may not use more than 100mA,
+		 * or 8mA for OTG ports */
 		if (udev->actconfig)
-			delta = udev->actconfig->desc.bMaxPower;
+			delta = udev->actconfig->desc.bMaxPower * 2;
+		else if (port1 != udev->bus->otg_port || hdev->parent)
+			delta = 100;
 		else
-			delta = ceiling;
-		// dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
-		if (delta > ceiling)
-			dev_warn(&udev->dev, "%dmA over %dmA budget!\n",
-				2 * (delta - ceiling), 2 * ceiling);
+			delta = 8;
+		if (delta > hub->mA_per_port)
+			dev_warn(&udev->dev, "%dmA is over %umA budget "
+					"for port %d!\n",
+					delta, hub->mA_per_port, port1);
 		remaining -= delta;
 	}
 	if (remaining < 0) {
-		dev_warn(hub->intfdev,
-			"%dmA over power budget!\n",
-			-2 * remaining);
+		dev_warn(hub->intfdev, "%dmA over power budget!\n",
+			- remaining);
 		remaining = 0;
 	}
 	return remaining;
@@ -2486,7 +2538,8 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 
 		usb_set_device_state(udev, USB_STATE_POWERED);
 		udev->speed = USB_SPEED_UNKNOWN;
- 
+ 		udev->bus_mA = hub->mA_per_port;
+
 		/* set the address */
 		choose_address(udev);
 		if (udev->devnum <= 0) {
@@ -2506,16 +2559,16 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 		 * on the parent.
 		 */
 		if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
-				&& hub->power_budget) {
+				&& udev->bus_mA <= 100) {
 			u16	devstat;
 
 			status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
 					&devstat);
-			if (status < 0) {
+			if (status < 2) {
 				dev_dbg(&udev->dev, "get status %d ?\n", status);
 				goto loop_disable;
 			}
-			cpu_to_le16s(&devstat);
+			le16_to_cpus(&devstat);
 			if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
 				dev_err(&udev->dev,
 					"can't connect bus-powered hub "
@@ -2540,7 +2593,6 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 		 * udev becomes globally accessible, although presumably
 		 * no one will look at it until hdev is unlocked.
 		 */
-		down (&udev->serialize);
 		status = 0;
 
 		/* We mustn't add new devices if the parent hub has
@@ -2564,15 +2616,12 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 			}
 		}
 
-		up (&udev->serialize);
 		if (status)
 			goto loop_disable;
 
 		status = hub_power_remaining(hub);
 		if (status)
-			dev_dbg(hub_dev,
-				"%dmA power budget left\n",
-				2 * status);
+			dev_dbg(hub_dev, "%dmA power budget left\n", status);
 
 		return;
 
@@ -2648,6 +2697,8 @@ static void hub_events(void)
 		if (i) {
 			dpm_runtime_resume(&hdev->dev);
 			dpm_runtime_resume(&intf->dev);
+			usb_put_intf(intf);
+			continue;
 		}
 
 		/* Lock the device, then check to see if we were
@@ -2661,7 +2712,7 @@ static void hub_events(void)
 
 		/* If the hub has died, clean up after it */
 		if (hdev->state == USB_STATE_NOTATTACHED) {
-			hub_pre_reset(hub);
+			hub_pre_reset(hub, 0);
 			goto loop;
 		}
 
@@ -2784,6 +2835,11 @@ static void hub_events(void)
 			if (hubchange & HUB_CHANGE_LOCAL_POWER) {
 				dev_dbg (hub_dev, "power change\n");
 				clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
+				if (hubstatus & HUB_STATUS_LOCAL_POWER)
+					/* FIXME: Is this always true? */
+					hub->limited_power = 0;
+				else
+					hub->limited_power = 1;
 			}
 			if (hubchange & HUB_CHANGE_OVERCURRENT) {
 				dev_dbg (hub_dev, "overcurrent change\n");
@@ -2832,7 +2888,6 @@ static struct usb_device_id hub_id_table [] = {
 MODULE_DEVICE_TABLE (usb, hub_id_table);
 
 static struct usb_driver hub_driver = {
-	.owner =	THIS_MODULE,
 	.name =		"hub",
 	.probe =	hub_probe,
 	.disconnect =	hub_disconnect,
@@ -2944,7 +2999,8 @@ int usb_reset_device(struct usb_device *udev)
 	struct usb_hub			*parent_hub;
 	struct usb_device_descriptor	descriptor = udev->descriptor;
 	struct usb_hub			*hub = NULL;
-	int 				i, ret = 0, port1 = -1;
+	int 				i, ret = 0;
+	int				port1 = udev->portnum;
 
 	if (udev->state == USB_STATE_NOTATTACHED ||
 			udev->state == USB_STATE_SUSPENDED) {
@@ -2958,18 +3014,6 @@ int usb_reset_device(struct usb_device *udev)
 		dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
 		return -EISDIR;
 	}
-
-	for (i = 0; i < parent_hdev->maxchild; i++)
-		if (parent_hdev->children[i] == udev) {
-			port1 = i + 1;
-			break;
-		}
-
-	if (port1 < 0) {
-		/* If this ever happens, it's very bad */
-		dev_err(&udev->dev, "Can't locate device's port!\n");
-		return -ENOENT;
-	}
 	parent_hub = hdev_to_hub(parent_hdev);
 
 	/* If we're resetting an active hub, take some special actions */
@@ -2977,7 +3021,7 @@ int usb_reset_device(struct usb_device *udev)
 			udev->actconfig->interface[0]->dev.driver ==
 				&hub_driver.driver &&
 			(hub = hdev_to_hub(udev)) != NULL) {
-		hub_pre_reset(hub);
+		hub_pre_reset(hub, 0);
 	}
 
 	set_bit(port1, parent_hub->busy_bits);