Staging: USB/IP: add host driver (4d7b5c7f) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/staging/usbip/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -23,3 +23,14 @@ config USB_IP_VHCI_HCD

		To compile this driver as a module, choose M here: the
		module will be called vhci_hcd.

		config USB_IP_HOST
		tristate "USB IP host driver"
		depends on USB_IP_COMMON
		default N
		---help---
		This enables the USB IP device driver which will run on the
		host machine.

		To compile this driver as a module, choose M here: the
		module will be called usbip.

drivers/staging/usbip/Makefile

+3 −0

Original line number	Diff line number	Diff line
		@@ -4,6 +4,9 @@ usbip_common_mod-objs := usbip_common.o usbip_event.o
		obj-$(CONFIG_USB_IP_VHCI_HCD) += vhci-hcd.o
		vhci-hcd-objs := vhci_sysfs.o vhci_tx.o vhci_rx.o vhci_hcd.o

		obj-$(CONFIG_USB_IP_HOST) += usbip.o
		usbip-objs := stub_dev.o stub_main.o stub_rx.o stub_tx.o

		ifeq ($(CONFIG_USB_DEBUG),y)
		EXTRA_CFLAGS += -DDEBUG
		endif

drivers/staging/usbip/stub.h

0 → 100644

+95 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2003-2008 Takahiro Hirofuchi
		*
		* This is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
		* USA.
		*/

		#include <linux/kernel.h>
		#include <linux/list.h>
		#include <linux/spinlock.h>
		#include <linux/slab.h>
		#include <linux/string.h>
		#include <linux/module.h>
		#include <linux/net.h>

		struct stub_device {
		struct usb_interface *interface;
		struct list_head list;

		struct usbip_device ud;
		__u32 devid;

		/*
		* stub_priv preserves private data of each urb.
		* It is allocated as stub_priv_cache and assigned to urb->context.
		*
		* stub_priv is always linked to any one of 3 lists;
		* priv_init: linked to this until the comletion of a urb.
		* priv_tx : linked to this after the completion of a urb.
		* priv_free: linked to this after the sending of the result.
		*
		* Any of these list operations should be locked by priv_lock.
		*/
		spinlock_t priv_lock;
		struct list_head priv_init;
		struct list_head priv_tx;
		struct list_head priv_free;

		/* see comments for unlinking in stub_rx.c */
		struct list_head unlink_tx;
		struct list_head unlink_free;


		wait_queue_head_t tx_waitq;
		};

		/* private data into urb->priv */
		struct stub_priv {
		unsigned long seqnum;
		struct list_head list;
		struct stub_device *sdev;
		struct urb *urb;

		int unlinking;
		};

		struct stub_unlink {
		unsigned long seqnum;
		struct list_head list;
		__u32 status;
		};


		extern struct kmem_cache *stub_priv_cache;


		/-------------------------------------------------------------------------/
		/* prototype declarations */

		/* stub_tx.c */
		void stub_complete(struct urb *);
		void stub_tx_loop(struct usbip_task *);

		/* stub_dev.c */
		extern struct usb_driver stub_driver;

		/* stub_rx.c */
		void stub_rx_loop(struct usbip_task *);
		void stub_enqueue_ret_unlink(struct stub_device *, __u32, __u32);

		/* stub_main.c */
		int match_busid(char *busid);
		void stub_device_cleanup_urbs(struct stub_device *sdev);

drivers/staging/usbip/stub_dev.c

0 → 100644

+483 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2003-2008 Takahiro Hirofuchi
		*
		* This is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
		* USA.
		*/

		#include "usbip_common.h"
		#include "stub.h"



		static int stub_probe(struct usb_interface *interface,
		const struct usb_device_id *id);
		static void stub_disconnect(struct usb_interface *interface);


		/*
		* Define device IDs here if you want to explicitly limit exportable devices.
		* In the most cases, wild card matching will be ok because driver binding can
		* be changed dynamically by a userland program.
		*/
		static struct usb_device_id stub_table[] = {
		#if 0
		/* just an example */
		{ USB_DEVICE(0x05ac, 0x0301) }, /* Mac 1 button mouse */
		{ USB_DEVICE(0x0430, 0x0009) }, /* Plat Home Keyboard */
		{ USB_DEVICE(0x059b, 0x0001) }, /* Iomega USB Zip 100 */
		{ USB_DEVICE(0x04b3, 0x4427) }, /* IBM USB CD-ROM */
		{ USB_DEVICE(0x05a9, 0xa511) }, /* LifeView USB cam */
		{ USB_DEVICE(0x55aa, 0x0201) }, /* Imation card reader */
		{ USB_DEVICE(0x046d, 0x0870) }, /* Qcam Express(QV-30) */
		{ USB_DEVICE(0x04bb, 0x0101) }, /* IO-DATA HD 120GB */
		{ USB_DEVICE(0x04bb, 0x0904) }, /* IO-DATA USB-ET/TX */
		{ USB_DEVICE(0x04bb, 0x0201) }, /* IO-DATA USB-ET/TX */
		{ USB_DEVICE(0x08bb, 0x2702) }, /* ONKYO USB Speaker */
		{ USB_DEVICE(0x046d, 0x08b2) }, /* Logicool Qcam 4000 Pro */
		#endif
		/* magic for wild card */
		{ .driver_info = 1 },
		{ 0, } /* Terminating entry */
		};
		MODULE_DEVICE_TABLE(usb, stub_table);

		struct usb_driver stub_driver = {
		.name = "usbip",
		.probe = stub_probe,
		.disconnect = stub_disconnect,
		.id_table = stub_table,
		};


		/-------------------------------------------------------------------------/

		/* Define sysfs entries for a usbip-bound device */


		/*
		* usbip_status shows status of usbip as long as this driver is bound to the
		* target device.
		*/
		static ssize_t show_status(struct device dev, struct device_attribute attr,
		char *buf)
		{
		struct stub_device *sdev = dev_get_drvdata(dev);
		int status;

		if (!sdev) {
		dev_err(dev, "sdev is null\n");
		return -ENODEV;
		}

		spin_lock(&sdev->ud.lock);
		status = sdev->ud.status;
		spin_unlock(&sdev->ud.lock);

		return snprintf(buf, PAGE_SIZE, "%d\n", status);
		}
		static DEVICE_ATTR(usbip_status, S_IRUGO, show_status, NULL);

		/*
		* usbip_sockfd gets a socket descriptor of an established TCP connection that
		* is used to transfer usbip requests by kernel threads. -1 is a magic number
		* by which usbip connection is finished.
		*/
		static ssize_t store_sockfd(struct device dev, struct device_attribute attr,
		const char *buf, size_t count)
		{
		struct stub_device *sdev = dev_get_drvdata(dev);
		int sockfd = 0;
		struct socket *socket;

		if (!sdev) {
		dev_err(dev, "sdev is null\n");
		return -ENODEV;
		}

		sscanf(buf, "%d", &sockfd);

		if (sockfd != -1) {
		dev_info(dev, "stub up\n");

		spin_lock(&sdev->ud.lock);

		if (sdev->ud.status != SDEV_ST_AVAILABLE) {
		dev_err(dev, "not ready\n");
		spin_unlock(&sdev->ud.lock);
		return -EINVAL;
		}

		socket = sockfd_to_socket(sockfd);
		if (!socket) {
		spin_unlock(&sdev->ud.lock);
		return -EINVAL;
		}

		#if 0
		setnodelay(socket);
		setkeepalive(socket);
		setreuse(socket);
		#endif

		sdev->ud.tcp_socket = socket;

		spin_unlock(&sdev->ud.lock);

		usbip_start_threads(&sdev->ud);

		spin_lock(&sdev->ud.lock);
		sdev->ud.status = SDEV_ST_USED;
		spin_unlock(&sdev->ud.lock);

		} else {
		dev_info(dev, "stub down\n");

		spin_lock(&sdev->ud.lock);
		if (sdev->ud.status != SDEV_ST_USED) {
		spin_unlock(&sdev->ud.lock);
		return -EINVAL;
		}
		spin_unlock(&sdev->ud.lock);

		usbip_event_add(&sdev->ud, SDEV_EVENT_DOWN);
		}

		return count;
		}
		static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);

		static int stub_add_files(struct device *dev)
		{
		int err = 0;

		err = device_create_file(dev, &dev_attr_usbip_status);
		if (err)
		goto err_status;

		err = device_create_file(dev, &dev_attr_usbip_sockfd);
		if (err)
		goto err_sockfd;

		err = device_create_file(dev, &dev_attr_usbip_debug);
		if (err)
		goto err_debug;

		return 0;

		err_debug:
		device_remove_file(dev, &dev_attr_usbip_sockfd);

		err_sockfd:
		device_remove_file(dev, &dev_attr_usbip_status);

		err_status:
		return err;
		}

		static void stub_remove_files(struct device *dev)
		{
		device_remove_file(dev, &dev_attr_usbip_status);
		device_remove_file(dev, &dev_attr_usbip_sockfd);
		device_remove_file(dev, &dev_attr_usbip_debug);
		}



		/-------------------------------------------------------------------------/

		/* Event handler functions called by an event handler thread */

		static void stub_shutdown_connection(struct usbip_device *ud)
		{
		struct stub_device *sdev = container_of(ud, struct stub_device, ud);

		/*
		* When removing an exported device, kernel panic sometimes occurred
		* and then EIP was sk_wait_data of stub_rx thread. Is this because
		* sk_wait_data returned though stub_rx thread was already finished by
		* step 1?
		*/
		if (ud->tcp_socket) {
		udbg("shutdown tcp_socket %p\n", ud->tcp_socket);
		kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
		}

		/* 1. stop threads */
		usbip_stop_threads(ud);

		/* 2. close the socket */
		/*
		* tcp_socket is freed after threads are killed.
		* So usbip_xmit do not touch NULL socket.
		*/
		if (ud->tcp_socket) {
		sock_release(ud->tcp_socket);
		ud->tcp_socket = NULL;
		}

		/* 3. free used data */
		stub_device_cleanup_urbs(sdev);

		/* 4. free stub_unlink */
		{
		unsigned long flags;
		struct stub_unlink unlink, tmp;

		spin_lock_irqsave(&sdev->priv_lock, flags);

		list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) {
		list_del(&unlink->list);
		kfree(unlink);
		}

		list_for_each_entry_safe(unlink, tmp,
		&sdev->unlink_free, list) {
		list_del(&unlink->list);
		kfree(unlink);
		}

		spin_unlock_irqrestore(&sdev->priv_lock, flags);
		}
		}

		static void stub_device_reset(struct usbip_device *ud)
		{
		struct stub_device *sdev = container_of(ud, struct stub_device, ud);
		struct usb_device *udev = interface_to_usbdev(sdev->interface);
		int ret;

		udbg("device reset");
		ret = usb_lock_device_for_reset(udev, sdev->interface);
		if (ret < 0) {
		dev_err(&udev->dev, "lock for reset\n");

		spin_lock(&ud->lock);
		ud->status = SDEV_ST_ERROR;
		spin_unlock(&ud->lock);

		return;
		}

		/* try to reset the device */
		ret = usb_reset_device(udev);

		usb_unlock_device(udev);

		spin_lock(&ud->lock);
		if (ret) {
		dev_err(&udev->dev, "device reset\n");
		ud->status = SDEV_ST_ERROR;

		} else {
		dev_info(&udev->dev, "device reset\n");
		ud->status = SDEV_ST_AVAILABLE;

		}
		spin_unlock(&ud->lock);

		return;
		}

		static void stub_device_unusable(struct usbip_device *ud)
		{
		spin_lock(&ud->lock);
		ud->status = SDEV_ST_ERROR;
		spin_unlock(&ud->lock);
		}


		/-------------------------------------------------------------------------/

		/**
		* stub_device_alloc - allocate a new stub_device struct
		* @interface: usb_interface of a new device
		*
		* Allocates and initializes a new stub_device struct.
		*/
		static struct stub_device stub_device_alloc(struct usb_interface interface)
		{
		struct stub_device *sdev;
		int busnum = interface_to_busnum(interface);
		int devnum = interface_to_devnum(interface);

		dev_dbg(&interface->dev, "allocating stub device");

		/* yes, it's a new device */
		sdev = kzalloc(sizeof(struct stub_device), GFP_KERNEL);
		if (!sdev) {
		dev_err(&interface->dev, "no memory for stub_device\n");
		return NULL;
		}

		sdev->interface = interface;

		/*
		* devid is defined with devnum when this driver is first allocated.
		* devnum may change later if a device is reset. However, devid never
		* changes during a usbip connection.
		*/
		sdev->devid = (busnum << 16) \| devnum;

		usbip_task_init(&sdev->ud.tcp_rx, "stub_rx", stub_rx_loop);
		usbip_task_init(&sdev->ud.tcp_tx, "stub_tx", stub_tx_loop);

		sdev->ud.side = USBIP_STUB;
		sdev->ud.status = SDEV_ST_AVAILABLE;
		/* sdev->ud.lock = SPIN_LOCK_UNLOCKED; */
		spin_lock_init(&sdev->ud.lock);
		sdev->ud.tcp_socket = NULL;

		INIT_LIST_HEAD(&sdev->priv_init);
		INIT_LIST_HEAD(&sdev->priv_tx);
		INIT_LIST_HEAD(&sdev->priv_free);
		INIT_LIST_HEAD(&sdev->unlink_free);
		INIT_LIST_HEAD(&sdev->unlink_tx);
		/* sdev->priv_lock = SPIN_LOCK_UNLOCKED; */
		spin_lock_init(&sdev->priv_lock);

		init_waitqueue_head(&sdev->tx_waitq);

		sdev->ud.eh_ops.shutdown = stub_shutdown_connection;
		sdev->ud.eh_ops.reset = stub_device_reset;
		sdev->ud.eh_ops.unusable = stub_device_unusable;

		usbip_start_eh(&sdev->ud);

		udbg("register new interface\n");
		return sdev;
		}

		static int stub_device_free(struct stub_device *sdev)
		{
		if (!sdev)
		return -EINVAL;

		kfree(sdev);
		udbg("kfree udev ok\n");

		return 0;
		}


		/-------------------------------------------------------------------------/

		/*
		* If a usb device has multiple active interfaces, this driver is bound to all
		* the active interfaces. However, usbip exports a usb device (i.e., not an
		* active interface). Currently, a userland program must ensure that it
		* looks at the usbip's sysfs entries of only the first active interface.
		*
		* TODO: use "struct usb_device_driver" to bind a usb device.
		* However, it seems it is not fully supported in mainline kernel yet
		* (2.6.19.2).
		*/
		static int stub_probe(struct usb_interface *interface,
		const struct usb_device_id *id)
		{
		struct usb_device *udev = interface_to_usbdev(interface);
		struct stub_device *sdev = NULL;
		char *udev_busid = interface->dev.parent->bus_id;
		int err = 0;

		dev_dbg(&interface->dev, "Enter\n");

		/* check we should claim or not by busid_table */
		if (match_busid(udev_busid)) {
		dev_info(&interface->dev,
		"this device %s is not in match_busid table. skip!\n",
		udev_busid);

		/*
		* Return value should be ENODEV or ENOXIO to continue trying
		* other matched drivers by the driver core.
		* See driver_probe_device() in driver/base/dd.c
		*/
		return -ENODEV;
		}

		if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) {
		udbg("this device %s is a usb hub device. skip!\n",
		udev_busid);
		return -ENODEV;
		}

		if (!strcmp(udev->bus->bus_name, "vhci_hcd")) {
		udbg("this device %s is attached on vhci_hcd. skip!\n",
		udev_busid);
		return -ENODEV;
		}

		/* ok. this is my device. */
		sdev = stub_device_alloc(interface);
		if (!sdev)
		return -ENOMEM;

		dev_info(&interface->dev, "USB/IP Stub: register a new interface "
		"(bus %u dev %u ifn %u)\n", udev->bus->busnum, udev->devnum,
		interface->cur_altsetting->desc.bInterfaceNumber);

		/* set private data to usb_interface */
		usb_set_intfdata(interface, sdev);

		err = stub_add_files(&interface->dev);
		if (err) {
		dev_err(&interface->dev, "create sysfs files for %s\n",
		udev_busid);
		return err;
		}

		return 0;
		}


		/*
		* called in usb_disconnect() or usb_deregister()
		* but only if actconfig(active configuration) exists
		*/
		static void stub_disconnect(struct usb_interface *interface)
		{
		struct stub_device *sdev = usb_get_intfdata(interface);

		udbg("Enter\n");

		/* get stub_device */
		if (!sdev) {
		err(" could not get device from inteface data");
		/* BUG(); */
		return;
		}

		usb_set_intfdata(interface, NULL);


		/*
		* NOTE:
		* rx/tx threads are invoked for each usb_device.
		*/
		stub_remove_files(&interface->dev);

		/* 1. shutdown the current connection */
		usbip_event_add(&sdev->ud, SDEV_EVENT_REMOVED);

		/* 2. wait for the stop of the event handler */
		usbip_stop_eh(&sdev->ud);

		/* 3. free sdev */
		stub_device_free(sdev);


		udbg("bye\n");
		}

drivers/staging/usbip/stub_main.c

0 → 100644

+300 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2003-2008 Takahiro Hirofuchi
		*
		* This is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
		* USA.
		*/


		#include "usbip_common.h"
		#include "stub.h"

		/* Version Information */
		#define DRIVER_VERSION "1.0"
		#define DRIVER_AUTHOR "Takahiro Hirofuchi"
		#define DRIVER_DESC "Stub Driver for USB/IP"

		/* stub_priv is allocated from stub_priv_cache */
		struct kmem_cache *stub_priv_cache;

		/-------------------------------------------------------------------------/

		/* Define sysfs entries for the usbip driver */


		/*
		* busid_tables defines matching busids that usbip can grab. A user can change
		* dynamically what device is locally used and what device is exported to a
		* remote host.
		*/
		#define MAX_BUSID 16
		static char busid_table[MAX_BUSID][BUS_ID_SIZE];
		static spinlock_t busid_table_lock;


		int match_busid(char *busid)
		{
		int i;

		spin_lock(&busid_table_lock);

		for (i = 0; i < MAX_BUSID; i++)
		if (busid_table[i][0])
		if (!strncmp(busid_table[i], busid, BUS_ID_SIZE)) {
		/* already registerd */
		spin_unlock(&busid_table_lock);
		return 0;
		}

		spin_unlock(&busid_table_lock);

		return 1;
		}

		static ssize_t show_match_busid(struct device_driver drv, char buf)
		{
		int i;
		char *out = buf;

		spin_lock(&busid_table_lock);

		for (i = 0; i < MAX_BUSID; i++)
		if (busid_table[i][0])
		out += sprintf(out, "%s ", busid_table[i]);

		spin_unlock(&busid_table_lock);

		out += sprintf(out, "\n");

		return out - buf;
		}

		static int add_match_busid(char *busid)
		{
		int i;

		if (!match_busid(busid))
		return 0;

		spin_lock(&busid_table_lock);

		for (i = 0; i < MAX_BUSID; i++)
		if (!busid_table[i][0]) {
		strncpy(busid_table[i], busid, BUS_ID_SIZE);
		spin_unlock(&busid_table_lock);
		return 0;
		}

		spin_unlock(&busid_table_lock);

		return -1;
		}

		static int del_match_busid(char *busid)
		{
		int i;

		spin_lock(&busid_table_lock);

		for (i = 0; i < MAX_BUSID; i++)
		if (!strncmp(busid_table[i], busid, BUS_ID_SIZE)) {
		/* found */
		memset(busid_table[i], 0, BUS_ID_SIZE);
		spin_unlock(&busid_table_lock);
		return 0;
		}

		spin_unlock(&busid_table_lock);

		return -1;
		}

		static ssize_t store_match_busid(struct device_driver dev, const char buf,
		size_t count)
		{
		int len;
		char busid[BUS_ID_SIZE];

		if (count < 5)
		return -EINVAL;

		/* strnlen() does not include \0 */
		len = strnlen(buf + 4, BUS_ID_SIZE);

		/* busid needs to include \0 termination */
		if (!(len < BUS_ID_SIZE))
		return -EINVAL;

		strncpy(busid, buf + 4, BUS_ID_SIZE);


		if (!strncmp(buf, "add ", 4)) {
		if (add_match_busid(busid) < 0)
		return -ENOMEM;
		else {
		udbg("add busid %s\n", busid);
		return count;
		}
		} else if (!strncmp(buf, "del ", 4)) {
		if (del_match_busid(busid) < 0)
		return -ENODEV;
		else {
		udbg("del busid %s\n", busid);
		return count;
		}
		} else
		return -EINVAL;
		}

		static DRIVER_ATTR(match_busid, S_IRUSR\|S_IWUSR, show_match_busid,
		store_match_busid);



		/-------------------------------------------------------------------------/

		/* Cleanup functions used to free private data */

		static struct stub_priv stub_priv_pop_from_listhead(struct list_head listhead)
		{
		struct stub_priv priv, tmp;

		list_for_each_entry_safe(priv, tmp, listhead, list) {
		list_del(&priv->list);
		return priv;
		}

		return NULL;
		}

		static struct stub_priv stub_priv_pop(struct stub_device sdev)
		{
		unsigned long flags;
		struct stub_priv *priv;

		spin_lock_irqsave(&sdev->priv_lock, flags);

		priv = stub_priv_pop_from_listhead(&sdev->priv_init);
		if (priv) {
		spin_unlock_irqrestore(&sdev->priv_lock, flags);
		return priv;
		}

		priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
		if (priv) {
		spin_unlock_irqrestore(&sdev->priv_lock, flags);
		return priv;
		}

		priv = stub_priv_pop_from_listhead(&sdev->priv_free);
		if (priv) {
		spin_unlock_irqrestore(&sdev->priv_lock, flags);
		return priv;
		}

		spin_unlock_irqrestore(&sdev->priv_lock, flags);
		return NULL;
		}

		void stub_device_cleanup_urbs(struct stub_device *sdev)
		{
		struct stub_priv *priv;

		udbg("free sdev %p\n", sdev);

		while ((priv = stub_priv_pop(sdev))) {
		struct urb *urb = priv->urb;

		udbg(" free urb %p\n", urb);
		usb_kill_urb(urb);

		kmem_cache_free(stub_priv_cache, priv);

		if (urb->transfer_buffer != NULL)
		kfree(urb->transfer_buffer);

		if (urb->setup_packet != NULL)
		kfree(urb->setup_packet);

		usb_free_urb(urb);
		}
		}


		/-------------------------------------------------------------------------/

		static int __init usb_stub_init(void)
		{
		int ret;

		stub_priv_cache = kmem_cache_create("stub_priv",
		sizeof(struct stub_priv), 0,
		SLAB_HWCACHE_ALIGN, NULL);

		if (!stub_priv_cache) {
		printk(KERN_ERR KBUILD_MODNAME
		": create stub_priv_cache error\n");
		return -ENOMEM;
		}

		ret = usb_register(&stub_driver);
		if (ret) {
		printk(KERN_ERR KBUILD_MODNAME ": usb_register failed %d\n",
		ret);
		goto error_usb_register;
		}

		printk(KERN_INFO KBUILD_MODNAME ":"
		DRIVER_DESC ":" DRIVER_VERSION "\n");

		memset(busid_table, 0, sizeof(busid_table));
		spin_lock_init(&busid_table_lock);

		ret = driver_create_file(&stub_driver.drvwrap.driver,
		&driver_attr_match_busid);

		if (ret) {
		printk(KERN_ERR KBUILD_MODNAME ": create driver sysfs\n");
		goto error_create_file;
		}

		return ret;
		error_create_file:
		usb_deregister(&stub_driver);
		error_usb_register:
		kmem_cache_destroy(stub_priv_cache);
		return ret;
		}

		static void __exit usb_stub_exit(void)
		{
		driver_remove_file(&stub_driver.drvwrap.driver,
		&driver_attr_match_busid);

		/*
		* deregister() calls stub_disconnect() for all devices. Device
		* specific data is cleared in stub_disconnect().
		*/
		usb_deregister(&stub_driver);

		kmem_cache_destroy(stub_priv_cache);
		}

		module_init(usb_stub_init);
		module_exit(usb_stub_exit);

		MODULE_AUTHOR(DRIVER_AUTHOR);
		MODULE_DESCRIPTION(DRIVER_DESC);
		MODULE_LICENSE("GPL");