Merge tag 'usb-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB / Thunderbolt / PHY driver updates from Greg KH:
 "Here is the big set of USB, Thunderbolt, and PHY driver updates for
  6.6-rc1. Included in here are:

   - PHY driver additions and cleanups

   - Thunderbolt minor additions and fixes

   - USB MIDI 2 gadget support added

   - dwc3 driver updates and additions

   - Removal of some old USB wireless code that was missed when that
     codebase was originally removed a few years ago, cleaning up some
     core USB code paths

   - USB core potential use-after-free fixes that syzbot from different
     people/groups keeps tripping over

   - typec updates and additions

   - gadget fixes and cleanups

   - loads of smaller USB core and driver cleanups all over the place

  Full details are in the shortlog. All of these have been in linux-next
  for a while with no reported problems"

* tag 'usb-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (154 commits)
  platform/chrome: cros_ec_typec: Configure Retimer cable type
  tcpm: Avoid soft reset when partner does not support get_status
  usb: typec: tcpm: reset counter when enter into unattached state after try role
  usb: typec: tcpm: set initial svdm version based on pd revision
  USB: serial: option: add FOXCONN T99W368/T99W373 product
  USB: serial: option: add Quectel EM05G variant (0x030e)
  usb: dwc2: add pci_device_id driver_data parse support
  usb: gadget: remove max support speed info in bind operation
  usb: gadget: composite: cleanup function config_ep_by_speed_and_alt()
  usb: gadget: config: remove max speed check in usb_assign_descriptors()
  usb: gadget: unconditionally allocate hs/ss descriptor in bind operation
  usb: gadget: f_uvc: change endpoint allocation in uvc_function_bind()
  usb: gadget: add a inline function gether_bitrate()
  usb: gadget: use working speed to calcaulate network bitrate and qlen
  dt-bindings: usb: samsung,exynos-dwc3: Add Exynos850 support
  usb: dwc3: exynos: Add support for Exynos850 variant
  usb: gadget: udc-xilinx: fix incorrect type in assignment warning
  usb: gadget: udc-xilinx: fix cast from restricted __le16 warning
  usb: gadget: udc-xilinx: fix restricted __le16 degrades to integer warning
  USB: dwc2: hande irq on dead controller correctly
  ...

12 files changed, 307 insertions, 419 deletions

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 725b8dbcfe5f..b19e38d5fd10 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -1051,9 +1051,6 @@ int usb_get_bos_descriptor(struct usb_device *dev)
 		}
 
 		switch (cap_type) {
-		case USB_CAP_TYPE_WIRELESS_USB:
-			/* Wireless USB cap descriptor is handled by wusb */
-			break;
 		case USB_CAP_TYPE_EXT:
 			dev->bos->ext_cap =
 				(struct usb_ext_cap_descriptor *)buffer;
diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c
index 2c14a9636056..a247da73f34d 100644
--- a/drivers/usb/core/devices.c
+++ b/drivers/usb/core/devices.c
@@ -424,7 +424,6 @@ static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
 	case USB_SPEED_UNKNOWN:		/* usb 1.1 root hub code */
 	case USB_SPEED_FULL:
 		speed = "12"; break;
-	case USB_SPEED_WIRELESS:	/* Wireless has no real fixed speed */
 	case USB_SPEED_HIGH:
 		speed = "480"; break;
 	case USB_SPEED_SUPER:
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c
index c4ed3310e069..a88ced93b5e7 100644
--- a/drivers/usb/core/file.c
+++ b/drivers/usb/core/file.c
@@ -29,7 +29,6 @@
 #define MAX_USB_MINORS	256
 static const struct file_operations *usb_minors[MAX_USB_MINORS];
 static DECLARE_RWSEM(minor_rwsem);
-static DEFINE_MUTEX(init_usb_class_mutex);
 
 static int usb_open(struct inode *inode, struct file *file)
 {
@@ -57,11 +56,6 @@ static const struct file_operations usb_fops = {
 	.llseek =	noop_llseek,
 };
 
-static struct usb_class {
-	struct kref kref;
-	struct class *class;
-} *usb_class;
-
 static char *usb_devnode(const struct device *dev, umode_t *mode)
 {
 	struct usb_class_driver *drv;
@@ -72,50 +66,10 @@ static char *usb_devnode(const struct device *dev, umode_t *mode)
 	return drv->devnode(dev, mode);
 }
 
-static int init_usb_class(void)
-{
-	int result = 0;
-
-	if (usb_class != NULL) {
-		kref_get(&usb_class->kref);
-		goto exit;
-	}
-
-	usb_class = kmalloc(sizeof(*usb_class), GFP_KERNEL);
-	if (!usb_class) {
-		result = -ENOMEM;
-		goto exit;
-	}
-
-	kref_init(&usb_class->kref);
-	usb_class->class = class_create("usbmisc");
-	if (IS_ERR(usb_class->class)) {
-		result = PTR_ERR(usb_class->class);
-		printk(KERN_ERR "class_create failed for usb devices\n");
-		kfree(usb_class);
-		usb_class = NULL;
-		goto exit;
-	}
-	usb_class->class->devnode = usb_devnode;
-
-exit:
-	return result;
-}
-
-static void release_usb_class(struct kref *kref)
-{
-	/* Ok, we cheat as we know we only have one usb_class */
-	class_destroy(usb_class->class);
-	kfree(usb_class);
-	usb_class = NULL;
-}
-
-static void destroy_usb_class(void)
-{
-	mutex_lock(&init_usb_class_mutex);
-	kref_put(&usb_class->kref, release_usb_class);
-	mutex_unlock(&init_usb_class_mutex);
-}
+const struct class usbmisc_class = {
+	.name		= "usbmisc",
+	.devnode	= usb_devnode,
+};
 
 int usb_major_init(void)
 {
@@ -156,7 +110,7 @@ void usb_major_cleanup(void)
 int usb_register_dev(struct usb_interface *intf,
 		     struct usb_class_driver *class_driver)
 {
-	int retval;
+	int retval = 0;
 	int minor_base = class_driver->minor_base;
 	int minor;
 	char name[20];
@@ -175,13 +129,6 @@ int usb_register_dev(struct usb_interface *intf,
 	if (intf->minor >= 0)
 		return -EADDRINUSE;
 
-	mutex_lock(&init_usb_class_mutex);
-	retval = init_usb_class();
-	mutex_unlock(&init_usb_class_mutex);
-
-	if (retval)
-		return retval;
-
 	dev_dbg(&intf->dev, "looking for a minor, starting at %d\n", minor_base);
 
 	down_write(&minor_rwsem);
@@ -200,7 +147,7 @@ int usb_register_dev(struct usb_interface *intf,
 
 	/* create a usb class device for this usb interface */
 	snprintf(name, sizeof(name), class_driver->name, minor - minor_base);
-	intf->usb_dev = device_create(usb_class->class, &intf->dev,
+	intf->usb_dev = device_create(&usbmisc_class, &intf->dev,
 				      MKDEV(USB_MAJOR, minor), class_driver,
 				      "%s", kbasename(name));
 	if (IS_ERR(intf->usb_dev)) {
@@ -234,7 +181,7 @@ void usb_deregister_dev(struct usb_interface *intf,
 		return;
 
 	dev_dbg(&intf->dev, "removing %d minor\n", intf->minor);
-	device_destroy(usb_class->class, MKDEV(USB_MAJOR, intf->minor));
+	device_destroy(&usbmisc_class, MKDEV(USB_MAJOR, intf->minor));
 
 	down_write(&minor_rwsem);
 	usb_minors[intf->minor] = NULL;
@@ -242,6 +189,5 @@ void usb_deregister_dev(struct usb_interface *intf,
 
 	intf->usb_dev = NULL;
 	intf->minor = -1;
-	destroy_usb_class();
 }
 EXPORT_SYMBOL_GPL(usb_deregister_dev);
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 8300baedafd2..12b6dfeaf658 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -156,27 +156,6 @@ static const u8 usb3_rh_dev_descriptor[18] = {
 	0x01        /*  __u8  bNumConfigurations; */
 };
 
-/* usb 2.5 (wireless USB 1.0) root hub device descriptor */
-static const u8 usb25_rh_dev_descriptor[18] = {
-	0x12,       /*  __u8  bLength; */
-	USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
-	0x50, 0x02, /*  __le16 bcdUSB; v2.5 */
-
-	0x09,	    /*  __u8  bDeviceClass; HUB_CLASSCODE */
-	0x00,	    /*  __u8  bDeviceSubClass; */
-	0x00,       /*  __u8  bDeviceProtocol; [ usb 2.0 no TT ] */
-	0xFF,       /*  __u8  bMaxPacketSize0; always 0xFF (WUSB Spec 7.4.1). */
-
-	0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
-	0x02, 0x00, /*  __le16 idProduct; device 0x0002 */
-	KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */
-
-	0x03,       /*  __u8  iManufacturer; */
-	0x02,       /*  __u8  iProduct; */
-	0x01,       /*  __u8  iSerialNumber; */
-	0x01        /*  __u8  bNumConfigurations; */
-};
-
 /* usb 2.0 root hub device descriptor */
 static const u8 usb2_rh_dev_descriptor[18] = {
 	0x12,       /*  __u8  bLength; */
@@ -368,7 +347,7 @@ static const u8 ss_rh_config_descriptor[] = {
 };
 
 /* authorized_default behaviour:
- * -1 is authorized for all devices except wireless (old behaviour)
+ * -1 is authorized for all devices (leftover from wireless USB)
  * 0 is unauthorized for all devices
  * 1 is authorized for all devices
  * 2 is authorized for internal devices
@@ -383,7 +362,7 @@ module_param(authorized_default, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(authorized_default,
 		"Default USB device authorization: 0 is not authorized, 1 is "
 		"authorized, 2 is authorized for internal devices, -1 is "
-		"authorized except for wireless USB (default, old behaviour)");
+		"authorized (default, same as 1)");
 /*-------------------------------------------------------------------------*/
 
 /**
@@ -578,9 +557,6 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 			case HCD_USB3:
 				bufp = usb3_rh_dev_descriptor;
 				break;
-			case HCD_USB25:
-				bufp = usb25_rh_dev_descriptor;
-				break;
 			case HCD_USB2:
 				bufp = usb2_rh_dev_descriptor;
 				break;
@@ -602,7 +578,6 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 				bufp = ss_rh_config_descriptor;
 				len = sizeof ss_rh_config_descriptor;
 				break;
-			case HCD_USB25:
 			case HCD_USB2:
 				bufp = hs_rh_config_descriptor;
 				len = sizeof hs_rh_config_descriptor;
@@ -983,6 +958,7 @@ static int register_root_hub(struct usb_hcd *hcd)
 {
 	struct device *parent_dev = hcd->self.controller;
 	struct usb_device *usb_dev = hcd->self.root_hub;
+	struct usb_device_descriptor *descr;
 	const int devnum = 1;
 	int retval;
 
@@ -994,13 +970,16 @@ static int register_root_hub(struct usb_hcd *hcd)
 	mutex_lock(&usb_bus_idr_lock);
 
 	usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
-	retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
-	if (retval != sizeof usb_dev->descriptor) {
+	descr = usb_get_device_descriptor(usb_dev);
+	if (IS_ERR(descr)) {
+		retval = PTR_ERR(descr);
 		mutex_unlock(&usb_bus_idr_lock);
 		dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
 				dev_name(&usb_dev->dev), retval);
-		return (retval < 0) ? retval : -EMSGSIZE;
+		return retval;
 	}
+	usb_dev->descriptor = *descr;
+	kfree(descr);
 
 	if (le16_to_cpu(usb_dev->descriptor.bcdUSB) >= 0x0201) {
 		retval = usb_get_bos_descriptor(usb_dev);
@@ -2844,18 +2823,14 @@ int usb_add_hcd(struct usb_hcd *hcd,
 		hcd->dev_policy = USB_DEVICE_AUTHORIZE_NONE;
 		break;
 
-	case USB_AUTHORIZE_ALL:
-		hcd->dev_policy = USB_DEVICE_AUTHORIZE_ALL;
-		break;
-
 	case USB_AUTHORIZE_INTERNAL:
 		hcd->dev_policy = USB_DEVICE_AUTHORIZE_INTERNAL;
 		break;
 
+	case USB_AUTHORIZE_ALL:
 	case USB_AUTHORIZE_WIRED:
 	default:
-		hcd->dev_policy = hcd->wireless ?
-			USB_DEVICE_AUTHORIZE_NONE : USB_DEVICE_AUTHORIZE_ALL;
+		hcd->dev_policy = USB_DEVICE_AUTHORIZE_ALL;
 		break;
 	}
 
@@ -2899,9 +2874,6 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	case HCD_USB2:
 		rhdev->speed = USB_SPEED_HIGH;
 		break;
-	case HCD_USB25:
-		rhdev->speed = USB_SPEED_WIRELESS;
-		break;
 	case HCD_USB3:
 		rhdev->speed = USB_SPEED_SUPER;
 		break;
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index a739403a9e45..3c54b218301c 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -614,6 +614,29 @@ static int hub_ext_port_status(struct usb_hub *hub, int port1, int type,
 		ret = 0;
 	}
 	mutex_unlock(&hub->status_mutex);
+
+	/*
+	 * There is no need to lock status_mutex here, because status_mutex
+	 * protects hub->status, and the phy driver only checks the port
+	 * status without changing the status.
+	 */
+	if (!ret) {
+		struct usb_device *hdev = hub->hdev;
+
+		/*
+		 * Only roothub will be notified of port state changes,
+		 * since the USB PHY only cares about changes at the next
+		 * level.
+		 */
+		if (is_root_hub(hdev)) {
+			struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
+
+			if (hcd->usb_phy)
+				usb_phy_notify_port_status(hcd->usb_phy,
+							   port1 - 1, *status, *change);
+		}
+	}
+
 	return ret;
 }
 
@@ -2117,22 +2140,6 @@ EXPORT_SYMBOL_GPL(usb_set_device_state);
  * USB-3.0 buses the address is assigned by the controller hardware
  * and it usually is not the same as the device number.
  *
- * WUSB devices are simple: they have no hubs behind, so the mapping
- * device <-> virtual port number becomes 1:1. Why? to simplify the
- * life of the device connection logic in
- * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
- * handshake we need to assign a temporary address in the unauthorized
- * space. For simplicity we use the first virtual port number found to
- * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
- * and that becomes it's address [X < 128] or its unauthorized address
- * [X | 0x80].
- *
- * We add 1 as an offset to the one-based USB-stack port number
- * (zero-based wusb virtual port index) for two reasons: (a) dev addr
- * 0 is reserved by USB for default address; (b) Linux's USB stack
- * uses always #1 for the root hub of the controller. So USB stack's
- * port #1, which is wusb virtual-port #0 has address #2.
- *
  * Devices connected under xHCI are not as simple.  The host controller
  * supports virtualization, so the hardware assigns device addresses and
  * the HCD must setup data structures before issuing a set address
@@ -2145,19 +2152,13 @@ static void choose_devnum(struct usb_device *udev)
 
 	/* be safe when more hub events are proceed in parallel */
 	mutex_lock(&bus->devnum_next_mutex);
-	if (udev->wusb) {
-		devnum = udev->portnum + 1;
-		BUG_ON(test_bit(devnum, bus->devmap.devicemap));
-	} else {
-		/* Try to allocate the next devnum beginning at
-		 * bus->devnum_next. */
-		devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
-					    bus->devnum_next);
-		if (devnum >= 128)
-			devnum = find_next_zero_bit(bus->devmap.devicemap,
-						    128, 1);
-		bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1);
-	}
+
+	/* Try to allocate the next devnum beginning at bus->devnum_next. */
+	devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
+			bus->devnum_next);
+	if (devnum >= 128)
+		devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
+	bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1);
 	if (devnum < 128) {
 		set_bit(devnum, bus->devmap.devicemap);
 		udev->devnum = devnum;
@@ -2175,9 +2176,7 @@ static void release_devnum(struct usb_device *udev)
 
 static void update_devnum(struct usb_device *udev, int devnum)
 {
-	/* The address for a WUSB device is managed by wusbcore. */
-	if (!udev->wusb)
-		udev->devnum = devnum;
+	udev->devnum = devnum;
 	if (!udev->devaddr)
 		udev->devaddr = (u8)devnum;
 }
@@ -2670,15 +2669,6 @@ int usb_authorize_device(struct usb_device *usb_dev)
 		goto error_autoresume;
 	}
 
-	if (usb_dev->wusb) {
-		result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
-		if (result < 0) {
-			dev_err(&usb_dev->dev, "can't re-read device descriptor for "
-				"authorization: %d\n", result);
-			goto error_device_descriptor;
-		}
-	}
-
 	usb_dev->authorized = 1;
 	/* Choose and set the configuration.  This registers the interfaces
 	 * with the driver core and lets interface drivers bind to them.
@@ -2695,7 +2685,6 @@ int usb_authorize_device(struct usb_device *usb_dev)
 	}
 	dev_info(&usb_dev->dev, "authorized to connect\n");
 
-error_device_descriptor:
 	usb_autosuspend_device(usb_dev);
 error_autoresume:
 out_authorized:
@@ -2778,17 +2767,6 @@ out:
 	return USB_SSP_GEN_UNKNOWN;
 }
 
-/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
-static unsigned hub_is_wusb(struct usb_hub *hub)
-{
-	struct usb_hcd *hcd;
-	if (hub->hdev->parent != NULL)  /* not a root hub? */
-		return 0;
-	hcd = bus_to_hcd(hub->hdev->bus);
-	return hcd->wireless;
-}
-
-
 #ifdef CONFIG_USB_FEW_INIT_RETRIES
 #define PORT_RESET_TRIES	2
 #define SET_ADDRESS_TRIES	1
@@ -2941,9 +2919,7 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1,
 		udev->tx_lanes = 1;
 		udev->ssp_rate = USB_SSP_GEN_UNKNOWN;
 	}
-	if (hub_is_wusb(hub))
-		udev->speed = USB_SPEED_WIRELESS;
-	else if (udev->ssp_rate != USB_SSP_GEN_UNKNOWN)
+	if (udev->ssp_rate != USB_SSP_GEN_UNKNOWN)
 		udev->speed = USB_SPEED_SUPER_PLUS;
 	else if (hub_is_superspeed(hub->hdev))
 		udev->speed = USB_SPEED_SUPER;
@@ -4718,6 +4694,67 @@ static int hub_enable_device(struct usb_device *udev)
 	return hcd->driver->enable_device(hcd, udev);
 }
 
+/*
+ * Get the bMaxPacketSize0 value during initialization by reading the
+ * device's device descriptor.  Since we don't already know this value,
+ * the transfer is unsafe and it ignores I/O errors, only testing for
+ * reasonable received values.
+ *
+ * For "old scheme" initialization, size will be 8 so we read just the
+ * start of the device descriptor, which should work okay regardless of
+ * the actual bMaxPacketSize0 value.  For "new scheme" initialization,
+ * size will be 64 (and buf will point to a sufficiently large buffer),
+ * which might not be kosher according to the USB spec but it's what
+ * Windows does and what many devices expect.
+ *
+ * Returns: bMaxPacketSize0 or a negative error code.
+ */
+static int get_bMaxPacketSize0(struct usb_device *udev,
+		struct usb_device_descriptor *buf, int size, bool first_time)
+{
+	int i, rc;
+
+	/*
+	 * Retry on all errors; some devices are flakey.
+	 * 255 is for WUSB devices, we actually need to use
+	 * 512 (WUSB1.0[4.8.1]).
+	 */
+	for (i = 0; i < GET_MAXPACKET0_TRIES; ++i) {
+		/* Start with invalid values in case the transfer fails */
+		buf->bDescriptorType = buf->bMaxPacketSize0 = 0;
+		rc = usb_control_msg(udev, usb_rcvaddr0pipe(),
+				USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
+				USB_DT_DEVICE << 8, 0,
+				buf, size,
+				initial_descriptor_timeout);
+		switch (buf->bMaxPacketSize0) {
+		case 8: case 16: case 32: case 64: case 9:
+			if (buf->bDescriptorType == USB_DT_DEVICE) {
+				rc = buf->bMaxPacketSize0;
+				break;
+			}
+			fallthrough;
+		default:
+			if (rc >= 0)
+				rc = -EPROTO;
+			break;
+		}
+
+		/*
+		 * Some devices time out if they are powered on
+		 * when already connected. They need a second
+		 * reset, so return early. But only on the first
+		 * attempt, lest we get into a time-out/reset loop.
+		 */
+		if (rc > 0 || (rc == -ETIMEDOUT && first_time &&
+				udev->speed > USB_SPEED_FULL))
+			break;
+	}
+	return rc;
+}
+
+#define GET_DESCRIPTOR_BUFSIZE	64
+
 /* Reset device, (re)assign address, get device descriptor.
  * Device connection must be stable, no more debouncing needed.
  * Returns device in USB_STATE_ADDRESS, except on error.
@@ -4727,10 +4764,17 @@ static int hub_enable_device(struct usb_device *udev)
  * the port lock.  For a newly detected device that is not accessible
  * through any global pointers, it's not necessary to lock the device,
  * but it is still necessary to lock the port.
+ *
+ * For a newly detected device, @dev_descr must be NULL.  The device
+ * descriptor retrieved from the device will then be stored in
+ * @udev->descriptor.  For an already existing device, @dev_descr
+ * must be non-NULL.  The device descriptor will be stored there,
+ * not in @udev->descriptor, because descriptors for registered
+ * devices are meant to be immutable.
  */
 static int
 hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
-		int retry_counter)
+		int retry_counter, struct usb_device_descriptor *dev_descr)
 {
 	struct usb_device	*hdev = hub->hdev;
 	struct usb_hcd		*hcd = bus_to_hcd(hdev->bus);
@@ -4742,6 +4786,13 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
 	int			devnum = udev->devnum;
 	const char		*driver_name;
 	bool			do_new_scheme;
+	const bool		initial = !dev_descr;
+	int			maxp0;
+	struct usb_device_descriptor	*buf, *descr;
+
+	buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
+	if (!buf)
+		return -ENOMEM;
 
 	/* root hub ports have a slightly longer reset period
 	 * (from USB 2.0 spec, section 7.1.7.5)
@@ -4774,38 +4825,34 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
 	}
 	oldspeed = udev->speed;
 
-	/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
-	 * it's fixed size except for full speed devices.
-	 * For Wireless USB devices, ep0 max packet is always 512 (tho
-	 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
-	 */
-	switch (udev->speed) {
-	case USB_SPEED_SUPER_PLUS:
-	case USB_SPEED_SUPER:
-	case USB_SPEED_WIRELESS:	/* fixed at 512 */
-		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
-		break;
-	case USB_SPEED_HIGH:		/* fixed at 64 */
-		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
-		break;
-	case USB_SPEED_FULL:		/* 8, 16, 32, or 64 */
-		/* to determine the ep0 maxpacket size, try to read
-		 * the device descriptor to get bMaxPacketSize0 and
-		 * then correct our initial guess.
+	if (initial) {
+		/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
+		 * it's fixed size except for full speed devices.
 		 */
-		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
-		break;
-	case USB_SPEED_LOW:		/* fixed at 8 */
-		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
-		break;
-	default:
-		goto fail;
+		switch (udev->speed) {
+		case USB_SPEED_SUPER_PLUS:
+		case USB_SPEED_SUPER:
+			udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
+			break;
+		case USB_SPEED_HIGH:		/* fixed at 64 */
+			udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
+			break;
+		case USB_SPEED_FULL:		/* 8, 16, 32, or 64 */
+			/* to determine the ep0 maxpacket size, try to read
+			 * the device descriptor to get bMaxPacketSize0 and
+			 * then correct our initial guess.
+			 */
+			udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
+			break;
+		case USB_SPEED_LOW:		/* fixed at 8 */
+			udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
+			break;
+		default:
+			goto fail;
+		}
 	}
 
-	if (udev->speed == USB_SPEED_WIRELESS)
-		speed = "variable speed Wireless";
-	else
-		speed = usb_speed_string(udev->speed);
+	speed = usb_speed_string(udev->speed);
 
 	/*
 	 * The controller driver may be NULL if the controller device
@@ -4822,22 +4869,24 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
 	if (udev->speed < USB_SPEED_SUPER)
 		dev_info(&udev->dev,
 				"%s %s USB device number %d using %s\n",
-				(udev->config) ? "reset" : "new", speed,
+				(initial ? "new" : "reset"), speed,
 				devnum, driver_name);
 
-	/* Set up TT records, if needed  */
-	if (hdev->tt) {
-		udev->tt = hdev->tt;
-		udev->ttport = hdev->ttport;
-	} else if (udev->speed != USB_SPEED_HIGH
-			&& hdev->speed == USB_SPEED_HIGH) {
-		if (!hub->tt.hub) {
-			dev_err(&udev->dev, "parent hub has no TT\n");
-			retval = -EINVAL;
-			goto fail;
+	if (initial) {
+		/* Set up TT records, if needed  */
+		if (hdev->tt) {
+			udev->tt = hdev->tt;
+			udev->ttport = hdev->ttport;
+		} else if (udev->speed != USB_SPEED_HIGH
+				&& hdev->speed == USB_SPEED_HIGH) {
+			if (!hub->tt.hub) {
+				dev_err(&udev->dev, "parent hub has no TT\n");
+				retval = -EINVAL;
+				goto fail;
+			}
+			udev->tt = &hub->tt;
+			udev->ttport = port1;
 		}
-		udev->tt = &hub->tt;
-		udev->ttport = port1;
 	}
 
 	/* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
@@ -4861,9 +4910,6 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
 		}
 
 		if (do_new_scheme) {
-			struct usb_device_descriptor *buf;
-			int r = 0;
-
 			retval = hub_enable_device(udev);
 			if (retval < 0) {
 				dev_err(&udev->dev,
@@ -4872,52 +4918,14 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
 				goto fail;
 			}
 
-#define GET_DESCRIPTOR_BUFSIZE	64
-			buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
-			if (!buf) {
-				retval = -ENOMEM;
-				continue;
-			}
-
-			/* Retry on all errors; some devices are flakey.
-			 * 255 is for WUSB devices, we actually need to use
-			 * 512 (WUSB1.0[4.8.1]).
-			 */
-			for (operations = 0; operations < GET_MAXPACKET0_TRIES;
-					++operations) {
-				buf->bMaxPacketSize0 = 0;
-				r = usb_control_msg(udev, usb_rcvaddr0pipe(),
-					USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
-					USB_DT_DEVICE << 8, 0,
-					buf, GET_DESCRIPTOR_BUFSIZE,
-					initial_descriptor_timeout);
-				switch (buf->bMaxPacketSize0) {
-				case 8: case 16: case 32: case 64: case 255:
-					if (buf->bDescriptorType ==
-							USB_DT_DEVICE) {
-						r = 0;
-						break;
-					}
-					fallthrough;
-				default:
-					if (r == 0)
-						r = -EPROTO;
-					break;
-				}
-				/*
-				 * Some devices time out if they are powered on
-				 * when already connected. They need a second
-				 * reset. But only on the first attempt,
-				 * lest we get into a time out/reset loop
-				 */
-				if (r == 0 || (r == -ETIMEDOUT &&
-						retries == 0 &&
-						udev->speed > USB_SPEED_FULL))
-					break;
+			maxp0 = get_bMaxPacketSize0(udev, buf,
+					GET_DESCRIPTOR_BUFSIZE, retries == 0);
+			if (maxp0 > 0 && !initial &&
+					maxp0 != udev->descriptor.bMaxPacketSize0) {
+				dev_err(&udev->dev, "device reset changed ep0 maxpacket size!\n");
+				retval = -ENODEV;
+				goto fail;
 			}
-			udev->descriptor.bMaxPacketSize0 =
-					buf->bMaxPacketSize0;
-			kfree(buf);
 
 			retval = hub_port_reset(hub, port1, udev, delay, false);
 			if (retval < 0)		/* error or disconnect */
@@ -4928,71 +4936,68 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
 				retval = -ENODEV;
 				goto fail;
 			}
-			if (r) {
-				if (r != -ENODEV)
+			if (maxp0 < 0) {
+				if (maxp0 != -ENODEV)
 					dev_err(&udev->dev, "device descriptor read/64, error %d\n",
-							r);
-				retval = -EMSGSIZE;
+							maxp0);
+				retval = maxp0;
 				continue;
 			}
-#undef GET_DESCRIPTOR_BUFSIZE
+		}
+
+		for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) {
+			retval = hub_set_address(udev, devnum);
+			if (retval >= 0)
+				break;
+			msleep(200);
+		}
+		if (retval < 0) {
+			if (retval != -ENODEV)
+				dev_err(&udev->dev, "device not accepting address %d, error %d\n",
+						devnum, retval);
+			goto fail;
+		}
+		if (udev->speed >= USB_SPEED_SUPER) {
+			devnum = udev->devnum;
+			dev_info(&udev->dev,
+					"%s SuperSpeed%s%s USB device number %d using %s\n",
+					(udev->config) ? "reset" : "new",
+				 (udev->speed == USB_SPEED_SUPER_PLUS) ?
+						" Plus" : "",
+				 (udev->ssp_rate == USB_SSP_GEN_2x2) ?
+						" Gen 2x2" :
+				 (udev->ssp_rate == USB_SSP_GEN_2x1) ?
+						" Gen 2x1" :
+				 (udev->ssp_rate == USB_SSP_GEN_1x2) ?
+						" Gen 1x2" : "",
+				 devnum, driver_name);
 		}
 
 		/*
-		 * If device is WUSB, we already assigned an
-		 * unauthorized address in the Connect Ack sequence;
-		 * authorization will assign the final address.
+		 * cope with hardware quirkiness:
+		 *  - let SET_ADDRESS settle, some device hardware wants it
+		 *  - read ep0 maxpacket even for high and low speed,
 		 */
-		if (udev->wusb == 0) {
-			for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) {
-				retval = hub_set_address(udev, devnum);
-				if (retval >= 0)
-					break;
-				msleep(200);
-			}
-			if (retval < 0) {
-				if (retval != -ENODEV)
-					dev_err(&udev->dev, "device not accepting address %d, error %d\n",
-							devnum, retval);
-				goto fail;
-			}
-			if (udev->speed >= USB_SPEED_SUPER) {
-				devnum = udev->devnum;
-				dev_info(&udev->dev,
-						"%s SuperSpeed%s%s USB device number %d using %s\n",
-						(udev->config) ? "reset" : "new",
-					 (udev->speed == USB_SPEED_SUPER_PLUS) ?
-							" Plus" : "",
-					 (udev->ssp_rate == USB_SSP_GEN_2x2) ?
-							" Gen 2x2" :
-					 (udev->ssp_rate == USB_SSP_GEN_2x1) ?
-							" Gen 2x1" :
-					 (udev->ssp_rate == USB_SSP_GEN_1x2) ?
-							" Gen 1x2" : "",
-					 devnum, driver_name);
-			}
+		msleep(10);
 
-			/* cope with hardware quirkiness:
-			 *  - let SET_ADDRESS settle, some device hardware wants it
-			 *  - read ep0 maxpacket even for high and low speed,
-			 */
-			msleep(10);
-			if (do_new_scheme)
-				break;
-		}
+		if (do_new_scheme)
+			break;
 
-		retval = usb_get_device_descriptor(udev, 8);
-		if (retval < 8) {
+		maxp0 = get_bMaxPacketSize0(udev, buf, 8, retries == 0);
+		if (maxp0 < 0) {
+			retval = maxp0;
 			if (retval != -ENODEV)
 				dev_err(&udev->dev,
 					"device descriptor read/8, error %d\n",
 					retval);
-			if (retval >= 0)
-				retval = -EMSGSIZE;
 		} else {
 			u32 delay;
 
-			retval = 0;
+			if (!initial && maxp0 != udev->descriptor.bMaxPacketSize0) {
+				dev_err(&udev->dev, "device reset changed ep0 maxpacket size!\n");
+				retval = -ENODEV;
+				goto fail;
+			}
 
 			delay = udev->parent->hub_delay;
 			udev->hub_delay = min_t(u32, delay,
@@ -5011,54 +5016,67 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
 		goto fail;
 
 	/*
-	 * Some superspeed devices have finished the link training process
-	 * and attached to a superspeed hub port, but the device descriptor
-	 * got from those devices show they aren't superspeed devices. Warm
-	 * reset the port attached by the devices can fix them.
+	 * Check the ep0 maxpacket guess and correct it if necessary.
+	 * maxp0 is the value stored in the device descriptor;
+	 * i is the value it encodes (logarithmic for SuperSpeed or greater).
 	 */
-	if ((udev->speed >= USB_SPEED_SUPER) &&
-			(le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
-		dev_err(&udev->dev, "got a wrong device descriptor, "
-				"warm reset device\n");
-		hub_port_reset(hub, port1, udev,
-				HUB_BH_RESET_TIME, true);
-		retval = -EINVAL;
-		goto fail;
-	}
-
-	if (udev->descriptor.bMaxPacketSize0 == 0xff ||
-			udev->speed >= USB_SPEED_SUPER)
-		i = 512;
-	else
-		i = udev->descriptor.bMaxPacketSize0;
-	if (usb_endpoint_maxp(&udev->ep0.desc) != i) {
-		if (udev->speed == USB_SPEED_LOW ||
-				!(i == 8 || i == 16 || i == 32 || i == 64)) {
-			dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
-			retval = -EMSGSIZE;
-			goto fail;
-		}
+	i = maxp0;
+	if (udev->speed >= USB_SPEED_SUPER) {
+		if (maxp0 <= 16)
+			i = 1 << maxp0;
+		else
+			i = 0;		/* Invalid */
+	}
+	if (usb_endpoint_maxp(&udev->ep0.desc) == i) {
+		;	/* Initial ep0 maxpacket guess is right */
+	} else if ((udev->speed == USB_SPEED_FULL ||
+				udev->speed == USB_SPEED_HIGH) &&
+			(i == 8 || i == 16 || i == 32 || i == 64)) {
+		/* Initial guess is wrong; use the descriptor's value */
 		if (udev->speed == USB_SPEED_FULL)
 			dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
 		else
 			dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
 		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
 		usb_ep0_reinit(udev);
+	} else {
+		/* Initial guess is wrong and descriptor's value is invalid */
+		dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", maxp0);
+		retval = -EMSGSIZE;
+		goto fail;
 	}
 
-	retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
-	if (retval < (signed)sizeof(udev->descriptor)) {
+	descr = usb_get_device_descriptor(udev);
+	if (IS_ERR(descr)) {
+		retval = PTR_ERR(descr);
 		if (retval != -ENODEV)
 			dev_err(&udev->dev, "device descriptor read/all, error %d\n",
 					retval);
-		if (retval >= 0)
-			retval = -ENOMSG;
+		goto fail;
+	}
+	if (initial)
+		udev->descriptor = *descr;
+	else
+		*dev_descr = *descr;
+	kfree(descr);
+
+	/*
+	 * Some superspeed devices have finished the link training process
+	 * and attached to a superspeed hub port, but the device descriptor
+	 * got from those devices show they aren't superspeed devices. Warm
+	 * reset the port attached by the devices can fix them.
+	 */
+	if ((udev->speed >= USB_SPEED_SUPER) &&
+			(le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
+		dev_err(&udev->dev, "got a wrong device descriptor, warm reset device\n");
+		hub_port_reset(hub, port1, udev, HUB_BH_RESET_TIME, true);
+		retval = -EINVAL;
 		goto fail;
 	}
 
 	usb_detect_quirks(udev);
 
-	if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
+	if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
 		retval = usb_get_bos_descriptor(udev);
 		if (!retval) {
 			udev->lpm_capable = usb_device_supports_lpm(udev);
@@ -5078,6 +5096,7 @@ fail:
 		hub_port_disable(hub, port1, 0);
 		update_devnum(udev, devnum);	/* for disconnect processing */
 	}
+	kfree(buf);
 	return retval;
 }
 
@@ -5158,7 +5177,7 @@ hub_power_remaining(struct usb_hub *hub)
 
 
 static int descriptors_changed(struct usb_device *udev,
-		struct usb_device_descriptor *old_device_descriptor,
+		struct usb_device_descriptor *new_device_descriptor,
 		struct usb_host_bos *old_bos)
 {
 	int		changed = 0;
@@ -5169,8 +5188,8 @@ static int descriptors_changed(struct usb_device *udev,
 	int		length;
 	char		*buf;
 
-	if (memcmp(&udev->descriptor, old_device_descriptor,
-			sizeof(*old_device_descriptor)) != 0)
+	if (memcmp(&udev->descriptor, new_device_descriptor,
+			sizeof(*new_device_descriptor)) != 0)
 		return 1;
 
 	if ((old_bos && !udev->bos) || (!old_bos && udev->bos))
@@ -5333,7 +5352,6 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
 		usb_set_device_state(udev, USB_STATE_POWERED);
 		udev->bus_mA = hub->mA_per_port;
 		udev->level = hdev->level + 1;
-		udev->wusb = hub_is_wusb(hub);
 
 		/* Devices connected to SuperSpeed hubs are USB 3.0 or later */
 		if (hub_is_superspeed(hub->hdev))
@@ -5348,7 +5366,7 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
 		}
 
 		/* reset (non-USB 3.0 devices) and get descriptor */
-		status = hub_port_init(hub, udev, port1, i);
+		status = hub_port_init(hub, udev, port1, i, NULL);
 		if (status < 0)
 			goto loop;
 
@@ -5495,9 +5513,8 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 {
 	struct usb_port *port_dev = hub->ports[port1 - 1];
 	struct usb_device *udev = port_dev->child;
-	struct usb_device_descriptor descriptor;
+	struct usb_device_descriptor *descr;
 	int status = -ENODEV;
-	int retval;
 
 	dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus,
 			portchange, portspeed(hub, portstatus));
@@ -5524,23 +5541,20 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 			 * changed device descriptors before resuscitating the
 			 * device.
 			 */
-			descriptor = udev->descriptor;
-			retval = usb_get_device_descriptor(udev,
-					sizeof(udev->descriptor));
-			if (retval < 0) {
+			descr = usb_get_device_descriptor(udev);
+			if (IS_ERR(descr)) {
 				dev_dbg(&udev->dev,
-						"can't read device descriptor %d\n",
-						retval);
+						"can't read device descriptor %ld\n",
+						PTR_ERR(descr));
 			} else {
-				if (descriptors_changed(udev, &descriptor,
+				if (descriptors_changed(udev, descr,
 						udev->bos)) {
 					dev_dbg(&udev->dev,
 							"device descriptor has changed\n");
-					/* for disconnect() calls */
-					udev->descriptor = descriptor;
 				} else {
 					status = 0; /* Nothing to do */
 				}
+				kfree(descr);
 			}
 #ifdef CONFIG_PM
 		} else if (udev->state == USB_STATE_SUSPENDED &&
@@ -5982,7 +5996,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
 	struct usb_device		*parent_hdev = udev->parent;
 	struct usb_hub			*parent_hub;
 	struct usb_hcd			*hcd = bus_to_hcd(udev->bus);
-	struct usb_device_descriptor	descriptor = udev->descriptor;
+	struct usb_device_descriptor	descriptor;
 	struct usb_host_bos		*bos;
 	int				i, j, ret = 0;
 	int				port1 = udev->portnum;
@@ -6018,7 +6032,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
 		/* ep0 maxpacket size may change; let the HCD know about it.
 		 * Other endpoints will be handled by re-enumeration. */
 		usb_ep0_reinit(udev);
-		ret = hub_port_init(parent_hub, udev, port1, i);
+		ret = hub_port_init(parent_hub, udev, port1, i, &descriptor);
 		if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
 			break;
 	}
@@ -6030,7 +6044,6 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
 	/* Device might have changed firmware (DFU or similar) */
 	if (descriptors_changed(udev, &descriptor, bos)) {
 		dev_info(&udev->dev, "device firmware changed\n");
-		udev->descriptor = descriptor;	/* for disconnect() calls */
 		goto re_enumerate;
 	}
 
diff --git a/drivers/usb/core/ledtrig-usbport.c b/drivers/usb/core/ledtrig-usbport.c
index ba371a24ff78..85c999f71ad7 100644
--- a/drivers/usb/core/ledtrig-usbport.c
+++ b/drivers/usb/core/ledtrig-usbport.c
@@ -350,18 +350,7 @@ static struct led_trigger usbport_led_trigger = {
 	.deactivate = usbport_trig_deactivate,
 };
 
-static int __init usbport_trig_init(void)
-{
-	return led_trigger_register(&usbport_led_trigger);
-}
-
-static void __exit usbport_trig_exit(void)
-{
-	led_trigger_unregister(&usbport_led_trigger);
-}
-
-module_init(usbport_trig_init);
-module_exit(usbport_trig_exit);
+module_led_trigger(usbport_led_trigger);
 
 MODULE_AUTHOR("Rafał Miłecki <rafal@milecki.pl>");
 MODULE_DESCRIPTION("USB port trigger");
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index b5811620f1de..077dfe48d01c 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -9,6 +9,7 @@
 #include <linux/pci.h>	/* for scatterlist macros */
 #include <linux/usb.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/timer.h>
@@ -1040,40 +1041,35 @@ char *usb_cache_string(struct usb_device *udev, int index)
 EXPORT_SYMBOL_GPL(usb_cache_string);
 
 /*
- * usb_get_device_descriptor - (re)reads the device descriptor (usbcore)
- * @dev: the device whose device descriptor is being updated
- * @size: how much of the descriptor to read
+ * usb_get_device_descriptor - read the device descriptor
+ * @udev: the device whose device descriptor should be read
  *
  * Context: task context, might sleep.
  *
- * Updates the copy of the device descriptor stored in the device structure,
- * which dedicates space for this purpose.
- *
  * Not exported, only for use by the core.  If drivers really want to read
  * the device descriptor directly, they can call usb_get_descriptor() with
  * type = USB_DT_DEVICE and index = 0.
  *
- * This call is synchronous, and may not be used in an interrupt context.
- *
- * Return: The number of bytes received on success, or else the status code
- * returned by the underlying usb_control_msg() call.
+ * Returns: a pointer to a dynamically allocated usb_device_descriptor
+ * structure (which the caller must deallocate), or an ERR_PTR value.
  */
-int usb_get_device_descriptor(struct usb_device *dev, unsigned int size)
+struct usb_device_descriptor *usb_get_device_descriptor(struct usb_device *udev)
 {
 	struct usb_device_descriptor *desc;
 	int ret;
 
-	if (size > sizeof(*desc))
-		return -EINVAL;
 	desc = kmalloc(sizeof(*desc), GFP_NOIO);
 	if (!desc)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
+
+	ret = usb_get_descriptor(udev, USB_DT_DEVICE, 0, desc, sizeof(*desc));
+	if (ret == sizeof(*desc))
+		return desc;
 
-	ret = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, size);
 	if (ret >= 0)
-		memcpy(&dev->descriptor, desc, size);
+		ret = -EMSGSIZE;
 	kfree(desc);
-	return ret;
+	return ERR_PTR(ret);
 }
 
 /*
diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c
index 617e92569b2c..db4ccf9ce3d9 100644
--- a/drivers/usb/core/of.c
+++ b/drivers/usb/core/of.c
@@ -8,7 +8,6 @@
  */
 
 #include <linux/of.h>
-#include <linux/of_platform.h>
 #include <linux/usb/of.h>
 
 /**
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 323dc02becbe..5d21718afb05 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -161,9 +161,6 @@ static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
 	case USB_SPEED_HIGH:
 		speed = "480";
 		break;
-	case USB_SPEED_WIRELESS:
-		speed = "480";
-		break;
 	case USB_SPEED_SUPER:
 		speed = "5000";
 		break;
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 9f3c54032556..7576920e2d5a 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -480,8 +480,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 			urb->iso_frame_desc[n].status = -EXDEV;
 			urb->iso_frame_desc[n].actual_length = 0;
 		}
-	} else if (urb->num_sgs && !urb->dev->bus->no_sg_constraint &&
-			dev->speed != USB_SPEED_WIRELESS) {
+	} else if (urb->num_sgs && !urb->dev->bus->no_sg_constraint) {
 		struct scatterlist *sg;
 		int i;
 
@@ -540,17 +539,9 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 	case USB_ENDPOINT_XFER_ISOC:
 	case USB_ENDPOINT_XFER_INT:
 		/* too small? */
-		switch (dev->speed) {
-		case USB_SPEED_WIRELESS:
-			if ((urb->interval < 6)
-				&& (xfertype == USB_ENDPOINT_XFER_INT))
-				return -EINVAL;
-			fallthrough;
-		default:
-			if (urb->interval <= 0)
-				return -EINVAL;
-			break;
-		}
+		if (urb->interval <= 0)
+			return -EINVAL;
+
 		/* too big? */
 		switch (dev->speed) {
 		case USB_SPEED_SUPER_PLUS:
@@ -560,10 +551,6 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 				return -EINVAL;
 			max = 1 << 15;
 			break;
-		case USB_SPEED_WIRELESS:
-			if (urb->interval > 16)
-				return -EINVAL;
-			break;
 		case USB_SPEED_HIGH:	/* units are microframes */
 			/* NOTE usb handles 2^15 */
 			if (urb->interval > (1024 * 8))
@@ -587,10 +574,8 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 		default:
 			return -EINVAL;
 		}
-		if (dev->speed != USB_SPEED_WIRELESS) {
-			/* Round down to a power of 2, no more than max */
-			urb->interval = min(max, 1 << ilog2(urb->interval));
-		}
+		/* Round down to a power of 2, no more than max */
+		urb->interval = min(max, 1 << ilog2(urb->interval));
 	}
 
 	return usb_hcd_submit_urb(urb, mem_flags);
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 901ec732321c..2a938cf47ccd 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -25,6 +25,7 @@
 
 #include <linux/module.h>
 #include <linux/moduleparam.h>
+#include <linux/of.h>
 #include <linux/string.h>
 #include <linux/bitops.h>
 #include <linux/slab.h>
@@ -601,14 +602,6 @@ struct device_type usb_device_type = {
 #endif
 };
 
-
-/* Returns 1 if @usb_bus is WUSB, 0 otherwise */
-static unsigned usb_bus_is_wusb(struct usb_bus *bus)
-{
-	struct usb_hcd *hcd = bus_to_hcd(bus);
-	return hcd->wireless;
-}
-
 static bool usb_dev_authorized(struct usb_device *dev, struct usb_hcd *hcd)
 {
 	struct usb_hub *hub;
@@ -652,7 +645,6 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
 {
 	struct usb_device *dev;
 	struct usb_hcd *usb_hcd = bus_to_hcd(bus);
-	unsigned root_hub = 0;
 	unsigned raw_port = port1;
 
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
@@ -702,7 +694,6 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
 		dev->dev.parent = bus->controller;
 		device_set_of_node_from_dev(&dev->dev, bus->sysdev);
 		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') {
@@ -748,9 +739,6 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent,
 #endif
 
 	dev->authorized = usb_dev_authorized(dev, usb_hcd);
-	if (!root_hub)
-		dev->wusb = usb_bus_is_wusb(bus) ? 1 : 0;
-
 	return dev;
 }
 EXPORT_SYMBOL_GPL(usb_alloc_dev);
@@ -1101,6 +1089,9 @@ static int __init usb_init(void)
 	retval = usb_major_init();
 	if (retval)
 		goto major_init_failed;
+	retval = class_register(&usbmisc_class);
+	if (retval)
+		goto class_register_failed;
 	retval = usb_register(&usbfs_driver);
 	if (retval)
 		goto driver_register_failed;
@@ -1120,6 +1111,8 @@ hub_init_failed:
 usb_devio_init_failed:
 	usb_deregister(&usbfs_driver);
 driver_register_failed:
+	class_unregister(&usbmisc_class);
+class_register_failed:
 	usb_major_cleanup();
 major_init_failed:
 	bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
@@ -1147,6 +1140,7 @@ static void __exit usb_exit(void)
 	usb_deregister(&usbfs_driver);
 	usb_devio_cleanup();
 	usb_hub_cleanup();
+	class_unregister(&usbmisc_class);
 	bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
 	bus_unregister(&usb_bus_type);
 	usb_acpi_unregister();
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index ffe3f6818e9c..60363153fc3f 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -43,8 +43,8 @@ extern bool usb_endpoint_is_ignored(struct usb_device *udev,
 		struct usb_endpoint_descriptor *epd);
 extern int usb_remove_device(struct usb_device *udev);
 
-extern int usb_get_device_descriptor(struct usb_device *dev,
-		unsigned int size);
+extern struct usb_device_descriptor *usb_get_device_descriptor(
+		struct usb_device *udev);
 extern int usb_set_isoch_delay(struct usb_device *dev);
 extern int usb_get_bos_descriptor(struct usb_device *dev);
 extern void usb_release_bos_descriptor(struct usb_device *dev);
@@ -141,6 +141,7 @@ static inline int usb_disable_usb2_hardware_lpm(struct usb_device *udev)
 
 #endif
 
+extern const struct class usbmisc_class;
 extern const struct bus_type usb_bus_type;
 extern struct mutex usb_port_peer_mutex;
 extern struct device_type usb_device_type;