Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 1121 insertions, 0 deletions

diff --git a/kernel/drivers/usb/core/usb.c b/kernel/drivers/usb/core/usb.c
new file mode 100644
index 000000000..8d5b2f411
--- /dev/null
+++ b/kernel/drivers/usb/core/usb.c
@@ -0,0 +1,1121 @@
+/*
+ * drivers/usb/core/usb.c
+ *
+ * (C) Copyright Linus Torvalds 1999
+ * (C) Copyright Johannes Erdfelt 1999-2001
+ * (C) Copyright Andreas Gal 1999
+ * (C) Copyright Gregory P. Smith 1999
+ * (C) Copyright Deti Fliegl 1999 (new USB architecture)
+ * (C) Copyright Randy Dunlap 2000
+ * (C) Copyright David Brownell 2000-2004
+ * (C) Copyright Yggdrasil Computing, Inc. 2000
+ *     (usb_device_id matching changes by Adam J. Richter)
+ * (C) Copyright Greg Kroah-Hartman 2002-2003
+ *
+ * NOTE! This is not actually a driver at all, rather this is
+ * just a collection of helper routines that implement the
+ * generic USB things that the real drivers can use..
+ *
+ * Think of this as a "USB library" rather than anything else.
+ * It should be considered a slave, with no callbacks. Callbacks
+ * are evil.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/string.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>  /* for in_interrupt() */
+#include <linux/kmod.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+#include <linux/debugfs.h>
+
+#include <asm/io.h>
+#include <linux/scatterlist.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+
+#include "usb.h"
+
+
+const char *usbcore_name = "usbcore";
+
+static bool nousb;	/* Disable USB when built into kernel image */
+
+/* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */
+#ifdef MODULE
+module_param(nousb, bool, 0444);
+#else
+core_param(nousb, nousb, bool, 0444);
+#endif
+
+/*
+ * for external read access to <nousb>
+ */
+int usb_disabled(void)
+{
+	return nousb;
+}
+EXPORT_SYMBOL_GPL(usb_disabled);
+
+#ifdef	CONFIG_PM
+static int usb_autosuspend_delay = 2;		/* Default delay value,
+						 * in seconds */
+module_param_named(autosuspend, usb_autosuspend_delay, int, 0644);
+MODULE_PARM_DESC(autosuspend, "default autosuspend delay");
+
+#else
+#define usb_autosuspend_delay		0
+#endif
+
+
+/**
+ * usb_find_alt_setting() - Given a configuration, find the alternate setting
+ * for the given interface.
+ * @config: the configuration to search (not necessarily the current config).
+ * @iface_num: interface number to search in
+ * @alt_num: alternate interface setting number to search for.
+ *
+ * Search the configuration's interface cache for the given alt setting.
+ *
+ * Return: The alternate setting, if found. %NULL otherwise.
+ */
+struct usb_host_interface *usb_find_alt_setting(
+		struct usb_host_config *config,
+		unsigned int iface_num,
+		unsigned int alt_num)
+{
+	struct usb_interface_cache *intf_cache = NULL;
+	int i;
+
+	for (i = 0; i < config->desc.bNumInterfaces; i++) {
+		if (config->intf_cache[i]->altsetting[0].desc.bInterfaceNumber
+				== iface_num) {
+			intf_cache = config->intf_cache[i];
+			break;
+		}
+	}
+	if (!intf_cache)
+		return NULL;
+	for (i = 0; i < intf_cache->num_altsetting; i++)
+		if (intf_cache->altsetting[i].desc.bAlternateSetting == alt_num)
+			return &intf_cache->altsetting[i];
+
+	printk(KERN_DEBUG "Did not find alt setting %u for intf %u, "
+			"config %u\n", alt_num, iface_num,
+			config->desc.bConfigurationValue);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(usb_find_alt_setting);
+
+/**
+ * usb_ifnum_to_if - get the interface object with a given interface number
+ * @dev: the device whose current configuration is considered
+ * @ifnum: the desired interface
+ *
+ * This walks the device descriptor for the currently active configuration
+ * to find the interface object with the particular interface number.
+ *
+ * Note that configuration descriptors are not required to assign interface
+ * numbers sequentially, so that it would be incorrect to assume that
+ * the first interface in that descriptor corresponds to interface zero.
+ * This routine helps device drivers avoid such mistakes.
+ * However, you should make sure that you do the right thing with any
+ * alternate settings available for this interfaces.
+ *
+ * Don't call this function unless you are bound to one of the interfaces
+ * on this device or you have locked the device!
+ *
+ * Return: A pointer to the interface that has @ifnum as interface number,
+ * if found. %NULL otherwise.
+ */
+struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev,
+				      unsigned ifnum)
+{
+	struct usb_host_config *config = dev->actconfig;
+	int i;
+
+	if (!config)
+		return NULL;
+	for (i = 0; i < config->desc.bNumInterfaces; i++)
+		if (config->interface[i]->altsetting[0]
+				.desc.bInterfaceNumber == ifnum)
+			return config->interface[i];
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(usb_ifnum_to_if);
+
+/**
+ * usb_altnum_to_altsetting - get the altsetting structure with a given alternate setting number.
+ * @intf: the interface containing the altsetting in question
+ * @altnum: the desired alternate setting number
+ *
+ * This searches the altsetting array of the specified interface for
+ * an entry with the correct bAlternateSetting value.
+ *
+ * Note that altsettings need not be stored sequentially by number, so
+ * it would be incorrect to assume that the first altsetting entry in
+ * the array corresponds to altsetting zero.  This routine helps device
+ * drivers avoid such mistakes.
+ *
+ * Don't call this function unless you are bound to the intf interface
+ * or you have locked the device!
+ *
+ * Return: A pointer to the entry of the altsetting array of @intf that
+ * has @altnum as the alternate setting number. %NULL if not found.
+ */
+struct usb_host_interface *usb_altnum_to_altsetting(
+					const struct usb_interface *intf,
+					unsigned int altnum)
+{
+	int i;
+
+	for (i = 0; i < intf->num_altsetting; i++) {
+		if (intf->altsetting[i].desc.bAlternateSetting == altnum)
+			return &intf->altsetting[i];
+	}
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(usb_altnum_to_altsetting);
+
+struct find_interface_arg {
+	int minor;
+	struct device_driver *drv;
+};
+
+static int __find_interface(struct device *dev, void *data)
+{
+	struct find_interface_arg *arg = data;
+	struct usb_interface *intf;
+
+	if (!is_usb_interface(dev))
+		return 0;
+
+	if (dev->driver != arg->drv)
+		return 0;
+	intf = to_usb_interface(dev);
+	return intf->minor == arg->minor;
+}
+
+/**
+ * usb_find_interface - find usb_interface pointer for driver and device
+ * @drv: the driver whose current configuration is considered
+ * @minor: the minor number of the desired device
+ *
+ * This walks the bus device list and returns a pointer to the interface
+ * with the matching minor and driver.  Note, this only works for devices
+ * that share the USB major number.
+ *
+ * Return: A pointer to the interface with the matching major and @minor.
+ */
+struct usb_interface *usb_find_interface(struct usb_driver *drv, int minor)
+{
+	struct find_interface_arg argb;
+	struct device *dev;
+
+	argb.minor = minor;
+	argb.drv = &drv->drvwrap.driver;
+
+	dev = bus_find_device(&usb_bus_type, NULL, &argb, __find_interface);
+
+	/* Drop reference count from bus_find_device */
+	put_device(dev);
+
+	return dev ? to_usb_interface(dev) : NULL;
+}
+EXPORT_SYMBOL_GPL(usb_find_interface);
+
+struct each_dev_arg {
+	void *data;
+	int (*fn)(struct usb_device *, void *);
+};
+
+static int __each_dev(struct device *dev, void *data)
+{
+	struct each_dev_arg *arg = (struct each_dev_arg *)data;
+
+	/* There are struct usb_interface on the same bus, filter them out */
+	if (!is_usb_device(dev))
+		return 0;
+
+	return arg->fn(container_of(dev, struct usb_device, dev), arg->data);
+}
+
+/**
+ * usb_for_each_dev - iterate over all USB devices in the system
+ * @data: data pointer that will be handed to the callback function
+ * @fn: callback function to be called for each USB device
+ *
+ * Iterate over all USB devices and call @fn for each, passing it @data. If it
+ * returns anything other than 0, we break the iteration prematurely and return
+ * that value.
+ */
+int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *))
+{
+	struct each_dev_arg arg = {data, fn};
+
+	return bus_for_each_dev(&usb_bus_type, NULL, &arg, __each_dev);
+}
+EXPORT_SYMBOL_GPL(usb_for_each_dev);
+
+/**
+ * usb_release_dev - free a usb device structure when all users of it are finished.
+ * @dev: device that's been disconnected
+ *
+ * Will be called only by the device core when all users of this usb device are
+ * done.
+ */
+static void usb_release_dev(struct device *dev)
+{
+	struct usb_device *udev;
+	struct usb_hcd *hcd;
+
+	udev = to_usb_device(dev);
+	hcd = bus_to_hcd(udev->bus);
+
+	usb_destroy_configuration(udev);
+	usb_release_bos_descriptor(udev);
+	usb_put_hcd(hcd);
+	kfree(udev->product);
+	kfree(udev->manufacturer);
+	kfree(udev->serial);
+	kfree(udev);
+}
+
+static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct usb_device *usb_dev;
+
+	usb_dev = to_usb_device(dev);
+
+	if (add_uevent_var(env, "BUSNUM=%03d", usb_dev->bus->busnum))
+		return -ENOMEM;
+
+	if (add_uevent_var(env, "DEVNUM=%03d", usb_dev->devnum))
+		return -ENOMEM;
+
+	return 0;
+}
+
+#ifdef	CONFIG_PM
+
+/* USB device Power-Management thunks.
+ * There's no need to distinguish here between quiescing a USB device
+ * and powering it down; the generic_suspend() routine takes care of
+ * it by skipping the usb_port_suspend() call for a quiesce.  And for
+ * USB interfaces there's no difference at all.
+ */
+
+static int usb_dev_prepare(struct device *dev)
+{
+	return 0;		/* Implement eventually? */
+}
+
+static void usb_dev_complete(struct device *dev)
+{
+	/* Currently used only for rebinding interfaces */
+	usb_resume_complete(dev);
+}
+
+static int usb_dev_suspend(struct device *dev)
+{
+	return usb_suspend(dev, PMSG_SUSPEND);
+}
+
+static int usb_dev_resume(struct device *dev)
+{
+	return usb_resume(dev, PMSG_RESUME);
+}
+
+static int usb_dev_freeze(struct device *dev)
+{
+	return usb_suspend(dev, PMSG_FREEZE);
+}
+
+static int usb_dev_thaw(struct device *dev)
+{
+	return usb_resume(dev, PMSG_THAW);
+}
+
+static int usb_dev_poweroff(struct device *dev)
+{
+	return usb_suspend(dev, PMSG_HIBERNATE);
+}
+
+static int usb_dev_restore(struct device *dev)
+{
+	return usb_resume(dev, PMSG_RESTORE);
+}
+
+static const struct dev_pm_ops usb_device_pm_ops = {
+	.prepare =	usb_dev_prepare,
+	.complete =	usb_dev_complete,
+	.suspend =	usb_dev_suspend,
+	.resume =	usb_dev_resume,
+	.freeze =	usb_dev_freeze,
+	.thaw =		usb_dev_thaw,
+	.poweroff =	usb_dev_poweroff,
+	.restore =	usb_dev_restore,
+	.runtime_suspend =	usb_runtime_suspend,
+	.runtime_resume =	usb_runtime_resume,
+	.runtime_idle =		usb_runtime_idle,
+};
+
+#endif	/* CONFIG_PM */
+
+
+static char *usb_devnode(struct device *dev,
+			 umode_t *mode, kuid_t *uid, kgid_t *gid)
+{
+	struct usb_device *usb_dev;
+
+	usb_dev = to_usb_device(dev);
+	return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d",
+			 usb_dev->bus->busnum, usb_dev->devnum);
+}
+
+struct device_type usb_device_type = {
+	.name =		"usb_device",
+	.release =	usb_release_dev,
+	.uevent =	usb_dev_uevent,
+	.devnode = 	usb_devnode,
+#ifdef CONFIG_PM
+	.pm =		&usb_device_pm_ops,
+#endif
+};
+
+
+/* Returns 1 if @usb_bus is WUSB, 0 otherwise */
+static unsigned usb_bus_is_wusb(struct usb_bus *bus)
+{
+	struct usb_hcd *hcd = container_of(bus, struct usb_hcd, self);
+	return hcd->wireless;
+}
+
+
+/**
+ * usb_alloc_dev - usb device constructor (usbcore-internal)
+ * @parent: hub to which device is connected; null to allocate a root hub
+ * @bus: bus used to access the device
+ * @port1: one-based index of port; ignored for root hubs
+ * Context: !in_interrupt()
+ *
+ * Only hub drivers (including virtual root hub drivers for host
+ * controllers) should ever call this.
+ *
+ * This call may not be used in a non-sleeping context.
+ *
+ * Return: On success, a pointer to the allocated usb device. %NULL on
+ * failure.
+ */
+struct usb_device *usb_alloc_dev(struct usb_device *parent,
+				 struct usb_bus *bus, unsigned port1)
+{
+	struct usb_device *dev;
+	struct usb_hcd *usb_hcd = bus_to_hcd(bus);
+	unsigned root_hub = 0;
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return NULL;
+
+	if (!usb_get_hcd(usb_hcd)) {
+		kfree(dev);
+		return NULL;
+	}
+	/* Root hubs aren't true devices, so don't allocate HCD resources */
+	if (usb_hcd->driver->alloc_dev && parent &&
+		!usb_hcd->driver->alloc_dev(usb_hcd, dev)) {
+		usb_put_hcd(bus_to_hcd(bus));
+		kfree(dev);
+		return NULL;
+	}
+
+	device_initialize(&dev->dev);
+	dev->dev.bus = &usb_bus_type;
+	dev->dev.type = &usb_device_type;
+	dev->dev.groups = usb_device_groups;
+	dev->dev.dma_mask = bus->controller->dma_mask;
+	set_dev_node(&dev->dev, dev_to_node(bus->controller));
+	dev->state = USB_STATE_ATTACHED;
+	dev->lpm_disable_count = 1;
+	atomic_set(&dev->urbnum, 0);
+
+	INIT_LIST_HEAD(&dev->ep0.urb_list);
+	dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE;
+	dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT;
+	/* ep0 maxpacket comes later, from device descriptor */
+	usb_enable_endpoint(dev, &dev->ep0, false);
+	dev->can_submit = 1;
+
+	/* Save readable and stable topology id, distinguishing devices
+	 * by location for diagnostics, tools, driver model, etc.  The
+	 * string is a path along hub ports, from the root.  Each device's
+	 * dev->devpath will be stable until USB is re-cabled, and hubs
+	 * are often labeled with these port numbers.  The name isn't
+	 * as stable:  bus->busnum changes easily from modprobe order,
+	 * cardbus or pci hotplugging, and so on.
+	 */
+	if (unlikely(!parent)) {
+		dev->devpath[0] = '0';
+		dev->route = 0;
+
+		dev->dev.parent = bus->controller;
+		dev_set_name(&dev->dev, "usb%d", bus->busnum);
+		root_hub = 1;
+	} else {
+		/* match any labeling on the hubs; it's one-based */
+		if (parent->devpath[0] == '0') {
+			snprintf(dev->devpath, sizeof dev->devpath,
+				"%d", port1);
+			/* Root ports are not counted in route string */
+			dev->route = 0;
+		} else {
+			snprintf(dev->devpath, sizeof dev->devpath,
+				"%s.%d", parent->devpath, port1);
+			/* Route string assumes hubs have less than 16 ports */
+			if (port1 < 15)
+				dev->route = parent->route +
+					(port1 << ((parent->level - 1)*4));
+			else
+				dev->route = parent->route +
+					(15 << ((parent->level - 1)*4));
+		}
+
+		dev->dev.parent = &parent->dev;
+		dev_set_name(&dev->dev, "%d-%s", bus->busnum, dev->devpath);
+
+		/* hub driver sets up TT records */
+	}
+
+	dev->portnum = port1;
+	dev->bus = bus;
+	dev->parent = parent;
+	INIT_LIST_HEAD(&dev->filelist);
+
+#ifdef	CONFIG_PM
+	pm_runtime_set_autosuspend_delay(&dev->dev,
+			usb_autosuspend_delay * 1000);
+	dev->connect_time = jiffies;
+	dev->active_duration = -jiffies;
+#endif
+	if (root_hub)	/* Root hub always ok [and always wired] */
+		dev->authorized = 1;
+	else {
+		dev->authorized = usb_hcd->authorized_default;
+		dev->wusb = usb_bus_is_wusb(bus) ? 1 : 0;
+	}
+	return dev;
+}
+EXPORT_SYMBOL_GPL(usb_alloc_dev);
+
+/**
+ * usb_get_dev - increments the reference count of the usb device structure
+ * @dev: the device being referenced
+ *
+ * Each live reference to a device should be refcounted.
+ *
+ * Drivers for USB interfaces should normally record such references in
+ * their probe() methods, when they bind to an interface, and release
+ * them by calling usb_put_dev(), in their disconnect() methods.
+ *
+ * Return: A pointer to the device with the incremented reference counter.
+ */
+struct usb_device *usb_get_dev(struct usb_device *dev)
+{
+	if (dev)
+		get_device(&dev->dev);
+	return dev;
+}
+EXPORT_SYMBOL_GPL(usb_get_dev);
+
+/**
+ * usb_put_dev - release a use of the usb device structure
+ * @dev: device that's been disconnected
+ *
+ * Must be called when a user of a device is finished with it.  When the last
+ * user of the device calls this function, the memory of the device is freed.
+ */
+void usb_put_dev(struct usb_device *dev)
+{
+	if (dev)
+		put_device(&dev->dev);
+}
+EXPORT_SYMBOL_GPL(usb_put_dev);
+
+/**
+ * usb_get_intf - increments the reference count of the usb interface structure
+ * @intf: the interface being referenced
+ *
+ * Each live reference to a interface must be refcounted.
+ *
+ * Drivers for USB interfaces should normally record such references in
+ * their probe() methods, when they bind to an interface, and release
+ * them by calling usb_put_intf(), in their disconnect() methods.
+ *
+ * Return: A pointer to the interface with the incremented reference counter.
+ */
+struct usb_interface *usb_get_intf(struct usb_interface *intf)
+{
+	if (intf)
+		get_device(&intf->dev);
+	return intf;
+}
+EXPORT_SYMBOL_GPL(usb_get_intf);
+
+/**
+ * usb_put_intf - release a use of the usb interface structure
+ * @intf: interface that's been decremented
+ *
+ * Must be called when a user of an interface is finished with it.  When the
+ * last user of the interface calls this function, the memory of the interface
+ * is freed.
+ */
+void usb_put_intf(struct usb_interface *intf)
+{
+	if (intf)
+		put_device(&intf->dev);
+}
+EXPORT_SYMBOL_GPL(usb_put_intf);
+
+/*			USB device locking
+ *
+ * USB devices and interfaces are locked using the semaphore in their
+ * embedded struct device.  The hub driver guarantees that whenever a
+ * device is connected or disconnected, drivers are called with the
+ * USB device locked as well as their particular interface.
+ *
+ * Complications arise when several devices are to be locked at the same
+ * time.  Only hub-aware drivers that are part of usbcore ever have to
+ * do this; nobody else needs to worry about it.  The rule for locking
+ * is simple:
+ *
+ *	When locking both a device and its parent, always lock the
+ *	the parent first.
+ */
+
+/**
+ * usb_lock_device_for_reset - cautiously acquire the lock for a usb device structure
+ * @udev: device that's being locked
+ * @iface: interface bound to the driver making the request (optional)
+ *
+ * Attempts to acquire the device lock, but fails if the device is
+ * NOTATTACHED or SUSPENDED, or if iface is specified and the interface
+ * is neither BINDING nor BOUND.  Rather than sleeping to wait for the
+ * lock, the routine polls repeatedly.  This is to prevent deadlock with
+ * disconnect; in some drivers (such as usb-storage) the disconnect()
+ * or suspend() method will block waiting for a device reset to complete.
+ *
+ * Return: A negative error code for failure, otherwise 0.
+ */
+int usb_lock_device_for_reset(struct usb_device *udev,
+			      const struct usb_interface *iface)
+{
+	unsigned long jiffies_expire = jiffies + HZ;
+
+	if (udev->state == USB_STATE_NOTATTACHED)
+		return -ENODEV;
+	if (udev->state == USB_STATE_SUSPENDED)
+		return -EHOSTUNREACH;
+	if (iface && (iface->condition == USB_INTERFACE_UNBINDING ||
+			iface->condition == USB_INTERFACE_UNBOUND))
+		return -EINTR;
+
+	while (!usb_trylock_device(udev)) {
+
+		/* If we can't acquire the lock after waiting one second,
+		 * we're probably deadlocked */
+		if (time_after(jiffies, jiffies_expire))
+			return -EBUSY;
+
+		msleep(15);
+		if (udev->state == USB_STATE_NOTATTACHED)
+			return -ENODEV;
+		if (udev->state == USB_STATE_SUSPENDED)
+			return -EHOSTUNREACH;
+		if (iface && (iface->condition == USB_INTERFACE_UNBINDING ||
+				iface->condition == USB_INTERFACE_UNBOUND))
+			return -EINTR;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_lock_device_for_reset);
+
+/**
+ * usb_get_current_frame_number - return current bus frame number
+ * @dev: the device whose bus is being queried
+ *
+ * Return: The current frame number for the USB host controller used
+ * with the given USB device. This can be used when scheduling
+ * isochronous requests.
+ *
+ * Note: Different kinds of host controller have different "scheduling
+ * horizons". While one type might support scheduling only 32 frames
+ * into the future, others could support scheduling up to 1024 frames
+ * into the future.
+ *
+ */
+int usb_get_current_frame_number(struct usb_device *dev)
+{
+	return usb_hcd_get_frame_number(dev);
+}
+EXPORT_SYMBOL_GPL(usb_get_current_frame_number);
+
+/*-------------------------------------------------------------------*/
+/*
+ * __usb_get_extra_descriptor() finds a descriptor of specific type in the
+ * extra field of the interface and endpoint descriptor structs.
+ */
+
+int __usb_get_extra_descriptor(char *buffer, unsigned size,
+			       unsigned char type, void **ptr)
+{
+	struct usb_descriptor_header *header;
+
+	while (size >= sizeof(struct usb_descriptor_header)) {
+		header = (struct usb_descriptor_header *)buffer;
+
+		if (header->bLength < 2) {
+			printk(KERN_ERR
+				"%s: bogus descriptor, type %d length %d\n",
+				usbcore_name,
+				header->bDescriptorType,
+				header->bLength);
+			return -1;
+		}
+
+		if (header->bDescriptorType == type) {
+			*ptr = header;
+			return 0;
+		}
+
+		buffer += header->bLength;
+		size -= header->bLength;
+	}
+	return -1;
+}
+EXPORT_SYMBOL_GPL(__usb_get_extra_descriptor);
+
+/**
+ * usb_alloc_coherent - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP
+ * @dev: device the buffer will be used with
+ * @size: requested buffer size
+ * @mem_flags: affect whether allocation may block
+ * @dma: used to return DMA address of buffer
+ *
+ * Return: Either null (indicating no buffer could be allocated), or the
+ * cpu-space pointer to a buffer that may be used to perform DMA to the
+ * specified device.  Such cpu-space buffers are returned along with the DMA
+ * address (through the pointer provided).
+ *
+ * Note:
+ * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags
+ * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU
+ * hardware during URB completion/resubmit.  The implementation varies between
+ * platforms, depending on details of how DMA will work to this device.
+ * Using these buffers also eliminates cacheline sharing problems on
+ * architectures where CPU caches are not DMA-coherent.  On systems without
+ * bus-snooping caches, these buffers are uncached.
+ *
+ * When the buffer is no longer used, free it with usb_free_coherent().
+ */
+void *usb_alloc_coherent(struct usb_device *dev, size_t size, gfp_t mem_flags,
+			 dma_addr_t *dma)
+{
+	if (!dev || !dev->bus)
+		return NULL;
+	return hcd_buffer_alloc(dev->bus, size, mem_flags, dma);
+}
+EXPORT_SYMBOL_GPL(usb_alloc_coherent);
+
+/**
+ * usb_free_coherent - free memory allocated with usb_alloc_coherent()
+ * @dev: device the buffer was used with
+ * @size: requested buffer size
+ * @addr: CPU address of buffer
+ * @dma: DMA address of buffer
+ *
+ * This reclaims an I/O buffer, letting it be reused.  The memory must have
+ * been allocated using usb_alloc_coherent(), and the parameters must match
+ * those provided in that allocation request.
+ */
+void usb_free_coherent(struct usb_device *dev, size_t size, void *addr,
+		       dma_addr_t dma)
+{
+	if (!dev || !dev->bus)
+		return;
+	if (!addr)
+		return;
+	hcd_buffer_free(dev->bus, size, addr, dma);
+}
+EXPORT_SYMBOL_GPL(usb_free_coherent);
+
+/**
+ * usb_buffer_map - create DMA mapping(s) for an urb
+ * @urb: urb whose transfer_buffer/setup_packet will be mapped
+ *
+ * URB_NO_TRANSFER_DMA_MAP is added to urb->transfer_flags if the operation
+ * succeeds. If the device is connected to this system through a non-DMA
+ * controller, this operation always succeeds.
+ *
+ * This call would normally be used for an urb which is reused, perhaps
+ * as the target of a large periodic transfer, with usb_buffer_dmasync()
+ * calls to synchronize memory and dma state.
+ *
+ * Reverse the effect of this call with usb_buffer_unmap().
+ *
+ * Return: Either %NULL (indicating no buffer could be mapped), or @urb.
+ *
+ */
+#if 0
+struct urb *usb_buffer_map(struct urb *urb)
+{
+	struct usb_bus		*bus;
+	struct device		*controller;
+
+	if (!urb
+			|| !urb->dev
+			|| !(bus = urb->dev->bus)
+			|| !(controller = bus->controller))
+		return NULL;
+
+	if (controller->dma_mask) {
+		urb->transfer_dma = dma_map_single(controller,
+			urb->transfer_buffer, urb->transfer_buffer_length,
+			usb_pipein(urb->pipe)
+				? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+	/* FIXME generic api broken like pci, can't report errors */
+	/* if (urb->transfer_dma == DMA_ADDR_INVALID) return 0; */
+	} else
+		urb->transfer_dma = ~0;
+	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+	return urb;
+}
+EXPORT_SYMBOL_GPL(usb_buffer_map);
+#endif  /*  0  */
+
+/* XXX DISABLED, no users currently.  If you wish to re-enable this
+ * XXX please determine whether the sync is to transfer ownership of
+ * XXX the buffer from device to cpu or vice verse, and thusly use the
+ * XXX appropriate _for_{cpu,device}() method.  -DaveM
+ */
+#if 0
+
+/**
+ * usb_buffer_dmasync - synchronize DMA and CPU view of buffer(s)
+ * @urb: urb whose transfer_buffer/setup_packet will be synchronized
+ */
+void usb_buffer_dmasync(struct urb *urb)
+{
+	struct usb_bus		*bus;
+	struct device		*controller;
+
+	if (!urb
+			|| !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
+			|| !urb->dev
+			|| !(bus = urb->dev->bus)
+			|| !(controller = bus->controller))
+		return;
+
+	if (controller->dma_mask) {
+		dma_sync_single_for_cpu(controller,
+			urb->transfer_dma, urb->transfer_buffer_length,
+			usb_pipein(urb->pipe)
+				? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+		if (usb_pipecontrol(urb->pipe))
+			dma_sync_single_for_cpu(controller,
+					urb->setup_dma,
+					sizeof(struct usb_ctrlrequest),
+					DMA_TO_DEVICE);
+	}
+}
+EXPORT_SYMBOL_GPL(usb_buffer_dmasync);
+#endif
+
+/**
+ * usb_buffer_unmap - free DMA mapping(s) for an urb
+ * @urb: urb whose transfer_buffer will be unmapped
+ *
+ * Reverses the effect of usb_buffer_map().
+ */
+#if 0
+void usb_buffer_unmap(struct urb *urb)
+{
+	struct usb_bus		*bus;
+	struct device		*controller;
+
+	if (!urb
+			|| !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
+			|| !urb->dev
+			|| !(bus = urb->dev->bus)
+			|| !(controller = bus->controller))
+		return;
+
+	if (controller->dma_mask) {
+		dma_unmap_single(controller,
+			urb->transfer_dma, urb->transfer_buffer_length,
+			usb_pipein(urb->pipe)
+				? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+	}
+	urb->transfer_flags &= ~URB_NO_TRANSFER_DMA_MAP;
+}
+EXPORT_SYMBOL_GPL(usb_buffer_unmap);
+#endif  /*  0  */
+
+#if 0
+/**
+ * usb_buffer_map_sg - create scatterlist DMA mapping(s) for an endpoint
+ * @dev: device to which the scatterlist will be mapped
+ * @is_in: mapping transfer direction
+ * @sg: the scatterlist to map
+ * @nents: the number of entries in the scatterlist
+ *
+ * Return: Either < 0 (indicating no buffers could be mapped), or the
+ * number of DMA mapping array entries in the scatterlist.
+ *
+ * Note:
+ * The caller is responsible for placing the resulting DMA addresses from
+ * the scatterlist into URB transfer buffer pointers, and for setting the
+ * URB_NO_TRANSFER_DMA_MAP transfer flag in each of those URBs.
+ *
+ * Top I/O rates come from queuing URBs, instead of waiting for each one
+ * to complete before starting the next I/O.   This is particularly easy
+ * to do with scatterlists.  Just allocate and submit one URB for each DMA
+ * mapping entry returned, stopping on the first error or when all succeed.
+ * Better yet, use the usb_sg_*() calls, which do that (and more) for you.
+ *
+ * This call would normally be used when translating scatterlist requests,
+ * rather than usb_buffer_map(), since on some hardware (with IOMMUs) it
+ * may be able to coalesce mappings for improved I/O efficiency.
+ *
+ * Reverse the effect of this call with usb_buffer_unmap_sg().
+ */
+int usb_buffer_map_sg(const struct usb_device *dev, int is_in,
+		      struct scatterlist *sg, int nents)
+{
+	struct usb_bus		*bus;
+	struct device		*controller;
+
+	if (!dev
+			|| !(bus = dev->bus)
+			|| !(controller = bus->controller)
+			|| !controller->dma_mask)
+		return -EINVAL;
+
+	/* FIXME generic api broken like pci, can't report errors */
+	return dma_map_sg(controller, sg, nents,
+			is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE) ? : -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(usb_buffer_map_sg);
+#endif
+
+/* XXX DISABLED, no users currently.  If you wish to re-enable this
+ * XXX please determine whether the sync is to transfer ownership of
+ * XXX the buffer from device to cpu or vice verse, and thusly use the
+ * XXX appropriate _for_{cpu,device}() method.  -DaveM
+ */
+#if 0
+
+/**
+ * usb_buffer_dmasync_sg - synchronize DMA and CPU view of scatterlist buffer(s)
+ * @dev: device to which the scatterlist will be mapped
+ * @is_in: mapping transfer direction
+ * @sg: the scatterlist to synchronize
+ * @n_hw_ents: the positive return value from usb_buffer_map_sg
+ *
+ * Use this when you are re-using a scatterlist's data buffers for
+ * another USB request.
+ */
+void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,
+			   struct scatterlist *sg, int n_hw_ents)
+{
+	struct usb_bus		*bus;
+	struct device		*controller;
+
+	if (!dev
+			|| !(bus = dev->bus)
+			|| !(controller = bus->controller)
+			|| !controller->dma_mask)
+		return;
+
+	dma_sync_sg_for_cpu(controller, sg, n_hw_ents,
+			    is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+}
+EXPORT_SYMBOL_GPL(usb_buffer_dmasync_sg);
+#endif
+
+#if 0
+/**
+ * usb_buffer_unmap_sg - free DMA mapping(s) for a scatterlist
+ * @dev: device to which the scatterlist will be mapped
+ * @is_in: mapping transfer direction
+ * @sg: the scatterlist to unmap
+ * @n_hw_ents: the positive return value from usb_buffer_map_sg
+ *
+ * Reverses the effect of usb_buffer_map_sg().
+ */
+void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in,
+			 struct scatterlist *sg, int n_hw_ents)
+{
+	struct usb_bus		*bus;
+	struct device		*controller;
+
+	if (!dev
+			|| !(bus = dev->bus)
+			|| !(controller = bus->controller)
+			|| !controller->dma_mask)
+		return;
+
+	dma_unmap_sg(controller, sg, n_hw_ents,
+			is_in ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+}
+EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg);
+#endif
+
+/*
+ * Notifications of device and interface registration
+ */
+static int usb_bus_notify(struct notifier_block *nb, unsigned long action,
+		void *data)
+{
+	struct device *dev = data;
+
+	switch (action) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (dev->type == &usb_device_type)
+			(void) usb_create_sysfs_dev_files(to_usb_device(dev));
+		else if (dev->type == &usb_if_device_type)
+			usb_create_sysfs_intf_files(to_usb_interface(dev));
+		break;
+
+	case BUS_NOTIFY_DEL_DEVICE:
+		if (dev->type == &usb_device_type)
+			usb_remove_sysfs_dev_files(to_usb_device(dev));
+		else if (dev->type == &usb_if_device_type)
+			usb_remove_sysfs_intf_files(to_usb_interface(dev));
+		break;
+	}
+	return 0;
+}
+
+static struct notifier_block usb_bus_nb = {
+	.notifier_call = usb_bus_notify,
+};
+
+struct dentry *usb_debug_root;
+EXPORT_SYMBOL_GPL(usb_debug_root);
+
+static struct dentry *usb_debug_devices;
+
+static int usb_debugfs_init(void)
+{
+	usb_debug_root = debugfs_create_dir("usb", NULL);
+	if (!usb_debug_root)
+		return -ENOENT;
+
+	usb_debug_devices = debugfs_create_file("devices", 0444,
+						usb_debug_root, NULL,
+						&usbfs_devices_fops);
+	if (!usb_debug_devices) {
+		debugfs_remove(usb_debug_root);
+		usb_debug_root = NULL;
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+static void usb_debugfs_cleanup(void)
+{
+	debugfs_remove(usb_debug_devices);
+	debugfs_remove(usb_debug_root);
+}
+
+/*
+ * Init
+ */
+static int __init usb_init(void)
+{
+	int retval;
+	if (usb_disabled()) {
+		pr_info("%s: USB support disabled\n", usbcore_name);
+		return 0;
+	}
+	usb_init_pool_max();
+
+	retval = usb_debugfs_init();
+	if (retval)
+		goto out;
+
+	usb_acpi_register();
+	retval = bus_register(&usb_bus_type);
+	if (retval)
+		goto bus_register_failed;
+	retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb);
+	if (retval)
+		goto bus_notifier_failed;
+	retval = usb_major_init();
+	if (retval)
+		goto major_init_failed;
+	retval = usb_register(&usbfs_driver);
+	if (retval)
+		goto driver_register_failed;
+	retval = usb_devio_init();
+	if (retval)
+		goto usb_devio_init_failed;
+	retval = usb_hub_init();
+	if (retval)
+		goto hub_init_failed;
+	retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE);
+	if (!retval)
+		goto out;
+
+	usb_hub_cleanup();
+hub_init_failed:
+	usb_devio_cleanup();
+usb_devio_init_failed:
+	usb_deregister(&usbfs_driver);
+driver_register_failed:
+	usb_major_cleanup();
+major_init_failed:
+	bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
+bus_notifier_failed:
+	bus_unregister(&usb_bus_type);
+bus_register_failed:
+	usb_acpi_unregister();
+	usb_debugfs_cleanup();
+out:
+	return retval;
+}
+
+/*
+ * Cleanup
+ */
+static void __exit usb_exit(void)
+{
+	/* This will matter if shutdown/reboot does exitcalls. */
+	if (usb_disabled())
+		return;
+
+	usb_deregister_device_driver(&usb_generic_driver);
+	usb_major_cleanup();
+	usb_deregister(&usbfs_driver);
+	usb_devio_cleanup();
+	usb_hub_cleanup();
+	bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
+	bus_unregister(&usb_bus_type);
+	usb_acpi_unregister();
+	usb_debugfs_cleanup();
+}
+
+subsys_initcall(usb_init);
+module_exit(usb_exit);
+MODULE_LICENSE("GPL");