diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c
index 1a8e960d073b..c0e6812426b3 100644
--- a/drivers/usb/host/whci/qset.c
+++ b/drivers/usb/host/whci/qset.c
@@ -314,7 +314,7 @@ void qset_free_std(struct whc *whc, struct whc_std *std)
 		kfree(std->bounce_buf);
 	}
 	if (std->pl_virt) {
-		if (std->dma_addr)
+		if (!dma_mapping_error(whc->wusbhc.dev, std->dma_addr))
 			dma_unmap_single(whc->wusbhc.dev, std->dma_addr,
 					 std->num_pointers * sizeof(struct whc_page_list_entry),
 					 DMA_TO_DEVICE);
@@ -535,9 +535,11 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u
 	list_for_each_entry(std, &qset->stds, list_node) {
 		if (std->ntds_remaining == -1) {
 			pl_len = std->num_pointers * sizeof(struct whc_page_list_entry);
-			std->ntds_remaining = ntds--;
 			std->dma_addr = dma_map_single(whc->wusbhc.dev, std->pl_virt,
 						       pl_len, DMA_TO_DEVICE);
+			if (dma_mapping_error(whc->wusbhc.dev, std->dma_addr))
+				return -EFAULT;
+			std->ntds_remaining = ntds--;
 		}
 	}
 	return 0;
@@ -618,6 +620,8 @@ static int qset_add_urb_sg_linearize(struct whc *whc, struct whc_qset *qset,
 
 		std->dma_addr = dma_map_single(&whc->umc->dev, std->bounce_buf, std->len,
 					       is_out ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+		if (dma_mapping_error(&whc->umc->dev, std->dma_addr))
+			return -EFAULT;
 
 		if (qset_fill_page_list(whc, std, mem_flags) < 0)
 			return -ENOMEM;
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 99b4ff42f7a0..251e29954711 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1768,7 +1768,7 @@ static int xhci_requires_manual_halt_cleanup(struct xhci_hcd *xhci,
 	if (trb_comp_code == COMP_TX_ERR ||
 			trb_comp_code == COMP_BABBLE ||
 			trb_comp_code == COMP_SPLIT_ERR)
-		/* The 0.96 spec says a babbling control endpoint
+		/* The 0.95 spec says a babbling control endpoint
 		 * is not halted. The 0.96 spec says it is.  Some HW
 		 * claims to be 0.95 compliant, but it halts the control
 		 * endpoint anyway.  Check if a babble halted the
diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
index a3ec49bdc1e6..e286346041f6 100644
--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -388,7 +388,6 @@ err_files:
 err_port:
 	dev_set_drvdata(&udev->dev, NULL);
 	usb_put_dev(udev);
-	kthread_stop_put(sdev->ud.eh);
 
 	busid_priv->sdev = NULL;
 	stub_device_free(sdev);
@@ -449,7 +448,7 @@ static void stub_disconnect(struct usb_device *udev)
 	}
 
 	/* If usb reset is called from event handler */
-	if (busid_priv->sdev->ud.eh == current)
+	if (usbip_in_eh(current))
 		return;
 
 	/* shutdown the current connection */
diff --git a/drivers/usb/usbip/usbip_common.c b/drivers/usb/usbip/usbip_common.c
index e40da7759a0e..2e5cf6392a8e 100644
--- a/drivers/usb/usbip/usbip_common.c
+++ b/drivers/usb/usbip/usbip_common.c
@@ -769,12 +769,19 @@ EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 
 static int __init usbip_core_init(void)
 {
+	int ret;
+
 	pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
+	ret = usbip_init_eh();
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
 static void __exit usbip_core_exit(void)
 {
+	usbip_finish_eh();
 	return;
 }
 
diff --git a/drivers/usb/usbip/usbip_common.h b/drivers/usb/usbip/usbip_common.h
index 86b08475c254..2fbbc643b888 100644
--- a/drivers/usb/usbip/usbip_common.h
+++ b/drivers/usb/usbip/usbip_common.h
@@ -267,7 +267,6 @@ struct usbip_device {
 	struct task_struct *tcp_tx;
 
 	unsigned long event;
-	struct task_struct *eh;
 	wait_queue_head_t eh_waitq;
 
 	struct eh_ops {
@@ -313,10 +312,13 @@ void usbip_pad_iso(struct usbip_device *ud, struct urb *urb);
 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb);
 
 /* usbip_event.c */
+int usbip_init_eh(void);
+void usbip_finish_eh(void);
 int usbip_start_eh(struct usbip_device *ud);
 void usbip_stop_eh(struct usbip_device *ud);
 void usbip_event_add(struct usbip_device *ud, unsigned long event);
 int usbip_event_happened(struct usbip_device *ud);
+int usbip_in_eh(struct task_struct *task);
 
 static inline int interface_to_busnum(struct usb_interface *interface)
 {
diff --git a/drivers/usb/usbip/usbip_event.c b/drivers/usb/usbip/usbip_event.c
index 2580a32bcdff..f1635662c299 100644
--- a/drivers/usb/usbip/usbip_event.c
+++ b/drivers/usb/usbip/usbip_event.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2003-2008 Takahiro Hirofuchi
+ * Copyright (C) 2015 Nobuo Iwata
  *
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -19,17 +20,68 @@
 
 #include <linux/kthread.h>
 #include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
 
 #include "usbip_common.h"
 
-static int event_handler(struct usbip_device *ud)
-{
-	usbip_dbg_eh("enter\n");
+struct usbip_event {
+	struct list_head node;
+	struct usbip_device *ud;
+};
 
-	/*
-	 * Events are handled by only this thread.
-	 */
-	while (usbip_event_happened(ud)) {
+static DEFINE_SPINLOCK(event_lock);
+static LIST_HEAD(event_list);
+
+static void set_event(struct usbip_device *ud, unsigned long event)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&ud->lock, flags);
+	ud->event |= event;
+	spin_unlock_irqrestore(&ud->lock, flags);
+}
+
+static void unset_event(struct usbip_device *ud, unsigned long event)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&ud->lock, flags);
+	ud->event &= ~event;
+	spin_unlock_irqrestore(&ud->lock, flags);
+}
+
+static struct usbip_device *get_event(void)
+{
+	struct usbip_event *ue = NULL;
+	struct usbip_device *ud = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&event_lock, flags);
+	if (!list_empty(&event_list)) {
+		ue = list_first_entry(&event_list, struct usbip_event, node);
+		list_del(&ue->node);
+	}
+	spin_unlock_irqrestore(&event_lock, flags);
+
+	if (ue) {
+		ud = ue->ud;
+		kfree(ue);
+	}
+	return ud;
+}
+
+static struct task_struct *worker_context;
+
+static void event_handler(struct work_struct *work)
+{
+	struct usbip_device *ud;
+
+	if (worker_context == NULL) {
+		worker_context = current;
+	}
+
+	while ((ud = get_event()) != NULL) {
 		usbip_dbg_eh("pending event %lx\n", ud->event);
 
 		/*
@@ -38,79 +90,102 @@ static int event_handler(struct usbip_device *ud)
 		 */
 		if (ud->event & USBIP_EH_SHUTDOWN) {
 			ud->eh_ops.shutdown(ud);
-			ud->event &= ~USBIP_EH_SHUTDOWN;
+			unset_event(ud, USBIP_EH_SHUTDOWN);
 		}
 
 		/* Reset the device. */
 		if (ud->event & USBIP_EH_RESET) {
 			ud->eh_ops.reset(ud);
-			ud->event &= ~USBIP_EH_RESET;
+			unset_event(ud, USBIP_EH_RESET);
 		}
 
 		/* Mark the device as unusable. */
 		if (ud->event & USBIP_EH_UNUSABLE) {
 			ud->eh_ops.unusable(ud);
-			ud->event &= ~USBIP_EH_UNUSABLE;
+			unset_event(ud, USBIP_EH_UNUSABLE);
 		}
 
 		/* Stop the error handler. */
 		if (ud->event & USBIP_EH_BYE)
-			return -1;
+			usbip_dbg_eh("removed %p\n", ud);
+
+		wake_up(&ud->eh_waitq);
 	}
-
-	return 0;
-}
-
-static int event_handler_loop(void *data)
-{
-	struct usbip_device *ud = data;
-
-	while (!kthread_should_stop()) {
-		wait_event_interruptible(ud->eh_waitq,
-					 usbip_event_happened(ud) ||
-					 kthread_should_stop());
-		usbip_dbg_eh("wakeup\n");
-
-		if (event_handler(ud) < 0)
-			break;
-	}
-
-	return 0;
 }
 
 int usbip_start_eh(struct usbip_device *ud)
 {
 	init_waitqueue_head(&ud->eh_waitq);
 	ud->event = 0;
-
-	ud->eh = kthread_run(event_handler_loop, ud, "usbip_eh");
-	if (IS_ERR(ud->eh)) {
-		pr_warn("Unable to start control thread\n");
-		return PTR_ERR(ud->eh);
-	}
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(usbip_start_eh);
 
 void usbip_stop_eh(struct usbip_device *ud)
 {
-	if (ud->eh == current)
-		return; /* do not wait for myself */
+	unsigned long pending = ud->event & ~USBIP_EH_BYE;
 
-	kthread_stop(ud->eh);
-	usbip_dbg_eh("usbip_eh has finished\n");
+	if (!(ud->event & USBIP_EH_BYE))
+		usbip_dbg_eh("usbip_eh stopping but not removed\n");
+
+	if (pending)
+		usbip_dbg_eh("usbip_eh waiting completion %lx\n", pending);
+
+	wait_event_interruptible(ud->eh_waitq, !(ud->event & ~USBIP_EH_BYE));
+	usbip_dbg_eh("usbip_eh has stopped\n");
 }
 EXPORT_SYMBOL_GPL(usbip_stop_eh);
 
+#define WORK_QUEUE_NAME "usbip_event"
+
+static struct workqueue_struct *usbip_queue;
+static DECLARE_WORK(usbip_work, event_handler);
+
+int usbip_init_eh(void)
+{
+	usbip_queue = create_singlethread_workqueue(WORK_QUEUE_NAME);
+	if (usbip_queue == NULL) {
+		pr_err("failed to create usbip_event\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+void usbip_finish_eh(void)
+{
+	flush_workqueue(usbip_queue);
+	destroy_workqueue(usbip_queue);
+	usbip_queue = NULL;
+}
+
 void usbip_event_add(struct usbip_device *ud, unsigned long event)
 {
+	struct usbip_event *ue;
 	unsigned long flags;
 
-	spin_lock_irqsave(&ud->lock, flags);
-	ud->event |= event;
-	wake_up(&ud->eh_waitq);
-	spin_unlock_irqrestore(&ud->lock, flags);
+	if (ud->event & USBIP_EH_BYE)
+		return;
+
+	set_event(ud, event);
+
+	spin_lock_irqsave(&event_lock, flags);
+
+	list_for_each_entry_reverse(ue, &event_list, node) {
+		if (ue->ud == ud)
+			goto out;
+	}
+
+	ue = kmalloc(sizeof(struct usbip_event), GFP_ATOMIC);
+	if (ue == NULL)
+		goto out;
+
+	ue->ud = ud;
+
+	list_add_tail(&ue->node, &event_list);
+	queue_work(usbip_queue, &usbip_work);
+
+out:
+	spin_unlock_irqrestore(&event_lock, flags);
 }
 EXPORT_SYMBOL_GPL(usbip_event_add);
 
@@ -127,3 +202,12 @@ int usbip_event_happened(struct usbip_device *ud)
 	return happened;
 }
 EXPORT_SYMBOL_GPL(usbip_event_happened);
+
+int usbip_in_eh(struct task_struct *task)
+{
+	if (task == worker_context)
+		return 1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usbip_in_eh);
diff --git a/drivers/usb/wusbcore/devconnect.c b/drivers/usb/wusbcore/devconnect.c
index 3f4f5fbded55..bf9551735938 100644
--- a/drivers/usb/wusbcore/devconnect.c
+++ b/drivers/usb/wusbcore/devconnect.c
@@ -893,7 +893,6 @@ out:
 error_nodev:
 	return;
 
-	wusb_dev_sysfs_rm(wusb_dev);
 error_add_sysfs:
 	wusb_dev_bos_rm(wusb_dev);
 error_bos_add:
diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h
index d5ce71607972..a8acc24765fe 100644
--- a/include/uapi/linux/usb/ch9.h
+++ b/include/uapi/linux/usb/ch9.h
@@ -105,6 +105,13 @@
 #define USB_REQ_LOOPBACK_DATA_READ	0x16
 #define USB_REQ_SET_INTERFACE_DS	0x17
 
+/* specific requests for USB Power Delivery */
+#define USB_REQ_GET_PARTNER_PDO		20
+#define USB_REQ_GET_BATTERY_STATUS	21
+#define USB_REQ_SET_PDO			22
+#define USB_REQ_GET_VDM			23
+#define USB_REQ_SEND_VDM		24
+
 /* The Link Power Management (LPM) ECN defines USB_REQ_TEST_AND_SET command,
  * used by hubs to put ports into a new L1 suspend state, except that it
  * forgot to define its number ...
@@ -165,6 +172,22 @@
 #define USB_DEV_STAT_U2_ENABLED		3	/* transition into U2 state */
 #define USB_DEV_STAT_LTM_ENABLED	4	/* Latency tolerance messages */
 
+/*
+ * Feature selectors from Table 9-8 USB Power Delivery spec
+ */
+#define USB_DEVICE_BATTERY_WAKE_MASK	40
+#define USB_DEVICE_OS_IS_PD_AWARE	41
+#define USB_DEVICE_POLICY_MODE		42
+#define USB_PORT_PR_SWAP		43
+#define USB_PORT_GOTO_MIN		44
+#define USB_PORT_RETURN_POWER		45
+#define USB_PORT_ACCEPT_PD_REQUEST	46
+#define USB_PORT_REJECT_PD_REQUEST	47
+#define USB_PORT_PORT_PD_RESET		48
+#define USB_PORT_C_PORT_PD_CHANGE	49
+#define USB_PORT_CABLE_PD_RESET		50
+#define USB_DEVICE_CHARGING_POLICY	54
+
 /**
  * struct usb_ctrlrequest - SETUP data for a USB device control request
  * @bRequestType: matches the USB bmRequestType field
@@ -913,6 +936,104 @@ struct usb_ssp_cap_descriptor {
 #define USB_SSP_SUBLINK_SPEED_LSM	(0xff << 16)	/* Lanespeed mantissa */
 } __attribute__((packed));
 
+/*
+ * USB Power Delivery Capability Descriptor:
+ * Defines capabilities for PD
+ */
+/* Defines the various PD Capabilities of this device */
+#define USB_PD_POWER_DELIVERY_CAPABILITY	0x06
+/* Provides information on each battery supported by the device */
+#define USB_PD_BATTERY_INFO_CAPABILITY		0x07
+/* The Consumer characteristics of a Port on the device */
+#define USB_PD_PD_CONSUMER_PORT_CAPABILITY	0x08
+/* The provider characteristics of a Port on the device */
+#define USB_PD_PD_PROVIDER_PORT_CAPABILITY	0x09
+
+struct usb_pd_cap_descriptor {
+	__u8  bLength;
+	__u8  bDescriptorType;
+	__u8  bDevCapabilityType; /* set to USB_PD_POWER_DELIVERY_CAPABILITY */
+	__u8  bReserved;
+	__le32 bmAttributes;
+#define USB_PD_CAP_BATTERY_CHARGING	(1 << 1) /* supports Battery Charging specification */
+#define USB_PD_CAP_USB_PD		(1 << 2) /* supports USB Power Delivery specification */
+#define USB_PD_CAP_PROVIDER		(1 << 3) /* can provide power */
+#define USB_PD_CAP_CONSUMER		(1 << 4) /* can consume power */
+#define USB_PD_CAP_CHARGING_POLICY	(1 << 5) /* supports CHARGING_POLICY feature */
+#define USB_PD_CAP_TYPE_C_CURRENT	(1 << 6) /* supports power capabilities defined in the USB Type-C Specification */
+
+#define USB_PD_CAP_PWR_AC		(1 << 8)
+#define USB_PD_CAP_PWR_BAT		(1 << 9)
+#define USB_PD_CAP_PWR_USE_V_BUS	(1 << 14)
+
+	__le16 bmProviderPorts; /* Bit zero refers to the UFP of the device */
+	__le16 bmConsumerPorts;
+	__le16 bcdBCVersion;
+	__le16 bcdPDVersion;
+	__le16 bcdUSBTypeCVersion;
+} __attribute__((packed));
+
+struct usb_pd_cap_battery_info_descriptor {
+	__u8 bLength;
+	__u8 bDescriptorType;
+	__u8 bDevCapabilityType;
+	/* Index of string descriptor shall contain the user friendly name for this battery */
+	__u8 iBattery;
+	/* Index of string descriptor shall contain the Serial Number String for this battery */
+	__u8 iSerial;
+	__u8 iManufacturer;
+	__u8 bBatteryId; /* uniquely identifies this battery in status Messages */
+	__u8 bReserved;
+	/*
+	 * Shall contain the Battery Charge value above which this
+	 * battery is considered to be fully charged but not necessarily
+	 * “topped off.”
+	 */
+	__le32 dwChargedThreshold; /* in mWh */
+	/*
+	 * Shall contain the minimum charge level of this battery such
+	 * that above this threshold, a device can be assured of being
+	 * able to power up successfully (see Battery Charging 1.2).
+	 */
+	__le32 dwWeakThreshold; /* in mWh */
+	__le32 dwBatteryDesignCapacity; /* in mWh */
+	__le32 dwBatteryLastFullchargeCapacity; /* in mWh */
+} __attribute__((packed));
+
+struct usb_pd_cap_consumer_port_descriptor {
+	__u8 bLength;
+	__u8 bDescriptorType;
+	__u8 bDevCapabilityType;
+	__u8 bReserved;
+	__u8 bmCapabilities;
+/* port will oerate under: */
+#define USB_PD_CAP_CONSUMER_BC		(1 << 0) /* BC */
+#define USB_PD_CAP_CONSUMER_PD		(1 << 1) /* PD */
+#define USB_PD_CAP_CONSUMER_TYPE_C	(1 << 2) /* USB Type-C Current */
+	__le16 wMinVoltage; /* in 50mV units */
+	__le16 wMaxVoltage; /* in 50mV units */
+	__u16 wReserved;
+	__le32 dwMaxOperatingPower; /* in 10 mW - operating at steady state */
+	__le32 dwMaxPeakPower; /* in 10mW units - operating at peak power */
+	__le32 dwMaxPeakPowerTime; /* in 100ms units - duration of peak */
+#define USB_PD_CAP_CONSUMER_UNKNOWN_PEAK_POWER_TIME 0xffff
+} __attribute__((packed));
+
+struct usb_pd_cap_provider_port_descriptor {
+	__u8 bLength;
+	__u8 bDescriptorType;
+	__u8 bDevCapabilityType;
+	__u8 bReserved1;
+	__u8 bmCapabilities;
+/* port will oerate under: */
+#define USB_PD_CAP_PROVIDER_BC		(1 << 0) /* BC */
+#define USB_PD_CAP_PROVIDER_PD		(1 << 1) /* PD */
+#define USB_PD_CAP_PROVIDER_TYPE_C	(1 << 2) /* USB Type-C Current */
+	__u8 bNumOfPDObjects;
+	__u8 bReserved2;
+	__le32 wPowerDataObject[];
+} __attribute__((packed));
+
 /*
  * Precision time measurement capability descriptor: advertised by devices and
  * hubs that support PTM