Added missing tegra files.HEADmaster

1 files changed, 776 insertions, 0 deletions

diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
new file mode 100644
index 00000000000..2278dad886e
--- /dev/null
+++ b/drivers/usb/core/inode.c
@@ -0,0 +1,776 @@
+/*****************************************************************************/
+
+/*
+ *      inode.c  --  Inode/Dentry functions for the USB device file system.
+ *
+ *      Copyright (C) 2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *      Copyright (C) 2001,2002,2004 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ *      This program 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 program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  History:
+ *   0.1  04.01.2000  Created
+ *   0.2  10.12.2001  converted to use the vfs layer better
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/pagemap.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/usb.h>
+#include <linux/namei.h>
+#include <linux/usbdevice_fs.h>
+#include <linux/parser.h>
+#include <linux/notifier.h>
+#include <linux/seq_file.h>
+#include <linux/usb/hcd.h>
+#include <asm/byteorder.h>
+#include "usb.h"
+
+#define USBFS_DEFAULT_DEVMODE (S_IWUSR | S_IRUGO)
+#define USBFS_DEFAULT_BUSMODE (S_IXUGO | S_IRUGO)
+#define USBFS_DEFAULT_LISTMODE S_IRUGO
+
+static const struct file_operations default_file_operations;
+static struct vfsmount *usbfs_mount;
+static int usbfs_mount_count;   /* = 0 */
+static int ignore_mount = 0;
+
+static struct dentry *devices_usbfs_dentry;
+static int num_buses;   /* = 0 */
+
+static uid_t devuid;    /* = 0 */
+static uid_t busuid;    /* = 0 */
+static uid_t listuid;   /* = 0 */
+static gid_t devgid;    /* = 0 */
+static gid_t busgid;    /* = 0 */
+static gid_t listgid;   /* = 0 */
+static umode_t devmode = USBFS_DEFAULT_DEVMODE;
+static umode_t busmode = USBFS_DEFAULT_BUSMODE;
+static umode_t listmode = USBFS_DEFAULT_LISTMODE;
+
+static int usbfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
+{
+        if (devuid != 0)
+                seq_printf(seq, ",devuid=%u", devuid);
+        if (devgid != 0)
+                seq_printf(seq, ",devgid=%u", devgid);
+        if (devmode != USBFS_DEFAULT_DEVMODE)
+                seq_printf(seq, ",devmode=%o", devmode);
+        if (busuid != 0)
+                seq_printf(seq, ",busuid=%u", busuid);
+        if (busgid != 0)
+                seq_printf(seq, ",busgid=%u", busgid);
+        if (busmode != USBFS_DEFAULT_BUSMODE)
+                seq_printf(seq, ",busmode=%o", busmode);
+        if (listuid != 0)
+                seq_printf(seq, ",listuid=%u", listuid);
+        if (listgid != 0)
+                seq_printf(seq, ",listgid=%u", listgid);
+        if (listmode != USBFS_DEFAULT_LISTMODE)
+                seq_printf(seq, ",listmode=%o", listmode);
+
+        return 0;
+}
+
+enum {
+        Opt_devuid, Opt_devgid, Opt_devmode,
+        Opt_busuid, Opt_busgid, Opt_busmode,
+        Opt_listuid, Opt_listgid, Opt_listmode,
+        Opt_err,
+};
+
+static const match_table_t tokens = {
+        {Opt_devuid, "devuid=%u"},
+        {Opt_devgid, "devgid=%u"},
+        {Opt_devmode, "devmode=%o"},
+        {Opt_busuid, "busuid=%u"},
+        {Opt_busgid, "busgid=%u"},
+        {Opt_busmode, "busmode=%o"},
+        {Opt_listuid, "listuid=%u"},
+        {Opt_listgid, "listgid=%u"},
+        {Opt_listmode, "listmode=%o"},
+        {Opt_err, NULL}
+};
+
+static int parse_options(struct super_block *s, char *data)
+{
+        char *p;
+        int option;
+
+        /* (re)set to defaults. */
+        devuid = 0;
+        busuid = 0;
+        listuid = 0;
+        devgid = 0;
+        busgid = 0;
+        listgid = 0;
+        devmode = USBFS_DEFAULT_DEVMODE;
+        busmode = USBFS_DEFAULT_BUSMODE;
+        listmode = USBFS_DEFAULT_LISTMODE;
+
+        while ((p = strsep(&data, ",")) != NULL) {
+                substring_t args[MAX_OPT_ARGS];
+                int token;
+                if (!*p)
+                        continue;
+
+                token = match_token(p, tokens, args);
+                switch (token) {
+                case Opt_devuid:
+                        if (match_int(&args[0], &option))
+                               return -EINVAL;
+                        devuid = option;
+                        break;
+                case Opt_devgid:
+                        if (match_int(&args[0], &option))
+                               return -EINVAL;
+                        devgid = option;
+                        break;
+                case Opt_devmode:
+                        if (match_octal(&args[0], &option))
+                                return -EINVAL;
+                        devmode = option & S_IRWXUGO;
+                        break;
+                case Opt_busuid:
+                        if (match_int(&args[0], &option))
+                               return -EINVAL;
+                        busuid = option;
+                        break;
+                case Opt_busgid:
+                        if (match_int(&args[0], &option))
+                               return -EINVAL;
+                        busgid = option;
+                        break;
+                case Opt_busmode:
+                        if (match_octal(&args[0], &option))
+                                return -EINVAL;
+                        busmode = option & S_IRWXUGO;
+                        break;
+                case Opt_listuid:
+                        if (match_int(&args[0], &option))
+                               return -EINVAL;
+                        listuid = option;
+                        break;
+                case Opt_listgid:
+                        if (match_int(&args[0], &option))
+                               return -EINVAL;
+                        listgid = option;
+                        break;
+                case Opt_listmode:
+                        if (match_octal(&args[0], &option))
+                                return -EINVAL;
+                        listmode = option & S_IRWXUGO;
+                        break;
+                default:
+                        printk(KERN_ERR "usbfs: unrecognised mount option "
+                               "\"%s\" or missing value\n", p);
+                        return -EINVAL;
+                }
+        }
+
+        return 0;
+}
+
+static void update_special(struct dentry *special)
+{
+        special->d_inode->i_uid = listuid;
+        special->d_inode->i_gid = listgid;
+        special->d_inode->i_mode = S_IFREG | listmode;
+}
+
+static void update_dev(struct dentry *dev)
+{
+        dev->d_inode->i_uid = devuid;
+        dev->d_inode->i_gid = devgid;
+        dev->d_inode->i_mode = S_IFREG | devmode;
+}
+
+static void update_bus(struct dentry *bus)
+{
+        struct dentry *dev = NULL;
+
+        bus->d_inode->i_uid = busuid;
+        bus->d_inode->i_gid = busgid;
+        bus->d_inode->i_mode = S_IFDIR | busmode;
+
+        mutex_lock(&bus->d_inode->i_mutex);
+
+        list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child)
+                if (dev->d_inode)
+                        update_dev(dev);
+
+        mutex_unlock(&bus->d_inode->i_mutex);
+}
+
+static void update_sb(struct super_block *sb)
+{
+        struct dentry *root = sb->s_root;
+        struct dentry *bus = NULL;
+
+        if (!root)
+                return;
+
+        mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);
+
+        list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
+                if (bus->d_inode) {
+                        switch (S_IFMT & bus->d_inode->i_mode) {
+                        case S_IFDIR:
+                                update_bus(bus);
+                                break;
+                        case S_IFREG:
+                                update_special(bus);
+                                break;
+                        default:
+                                printk(KERN_WARNING "usbfs: Unknown node %s "
+                                       "mode %x found on remount!\n",
+                                       bus->d_name.name, bus->d_inode->i_mode);
+                                break;
+                        }
+                }
+        }
+
+        mutex_unlock(&root->d_inode->i_mutex);
+}
+
+static int remount(struct super_block *sb, int *flags, char *data)
+{
+        /* If this is not a real mount,
+         * i.e. it's a simple_pin_fs from create_special_files,
+         * then ignore it.
+         */
+        if (ignore_mount)
+                return 0;
+
+        if (parse_options(sb, data)) {
+                printk(KERN_WARNING "usbfs: mount parameter error.\n");
+                return -EINVAL;
+        }
+
+        if (usbfs_mount && usbfs_mount->mnt_sb)
+                update_sb(usbfs_mount->mnt_sb);
+
+        return 0;
+}
+
+static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t dev)
+{
+        struct inode *inode = new_inode(sb);
+
+        if (inode) {
+                inode->i_ino = get_next_ino();
+                inode->i_mode = mode;
+                inode->i_uid = current_fsuid();
+                inode->i_gid = current_fsgid();
+                inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+                switch (mode & S_IFMT) {
+                default:
+                        init_special_inode(inode, mode, dev);
+                        break;
+                case S_IFREG:
+                        inode->i_fop = &default_file_operations;
+                        break;
+                case S_IFDIR:
+                        inode->i_op = &simple_dir_inode_operations;
+                        inode->i_fop = &simple_dir_operations;
+
+                        /* directory inodes start off with i_nlink == 2 (for "." entry) */
+                        inc_nlink(inode);
+                        break;
+                }
+        }
+        return inode; 
+}
+
+/* SMP-safe */
+static int usbfs_mknod (struct inode *dir, struct dentry *dentry, int mode,
+                        dev_t dev)
+{
+        struct inode *inode = usbfs_get_inode(dir->i_sb, mode, dev);
+        int error = -EPERM;
+
+        if (dentry->d_inode)
+                return -EEXIST;
+
+        if (inode) {
+                d_instantiate(dentry, inode);
+                dget(dentry);
+                error = 0;
+        }
+        return error;
+}
+
+static int usbfs_mkdir (struct inode *dir, struct dentry *dentry, int mode)
+{
+        int res;
+
+        mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
+        res = usbfs_mknod (dir, dentry, mode, 0);
+        if (!res)
+                inc_nlink(dir);
+        return res;
+}
+
+static int usbfs_create (struct inode *dir, struct dentry *dentry, int mode)
+{
+        mode = (mode & S_IALLUGO) | S_IFREG;
+        return usbfs_mknod (dir, dentry, mode, 0);
+}
+
+static inline int usbfs_positive (struct dentry *dentry)
+{
+        return dentry->d_inode && !d_unhashed(dentry);
+}
+
+static int usbfs_empty (struct dentry *dentry)
+{
+        struct list_head *list;
+
+        spin_lock(&dentry->d_lock);
+        list_for_each(list, &dentry->d_subdirs) {
+                struct dentry *de = list_entry(list, struct dentry, d_u.d_child);
+
+                spin_lock_nested(&de->d_lock, DENTRY_D_LOCK_NESTED);
+                if (usbfs_positive(de)) {
+                        spin_unlock(&de->d_lock);
+                        spin_unlock(&dentry->d_lock);
+                        return 0;
+                }
+                spin_unlock(&de->d_lock);
+        }
+        spin_unlock(&dentry->d_lock);
+        return 1;
+}
+
+static int usbfs_unlink (struct inode *dir, struct dentry *dentry)
+{
+        struct inode *inode = dentry->d_inode;
+        mutex_lock(&inode->i_mutex);
+        drop_nlink(dentry->d_inode);
+        dput(dentry);
+        mutex_unlock(&inode->i_mutex);
+        d_delete(dentry);
+        return 0;
+}
+
+static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+        int error = -ENOTEMPTY;
+        struct inode * inode = dentry->d_inode;
+
+        mutex_lock(&inode->i_mutex);
+        dentry_unhash(dentry);
+        if (usbfs_empty(dentry)) {
+                dont_mount(dentry);
+                drop_nlink(dentry->d_inode);
+                drop_nlink(dentry->d_inode);
+                dput(dentry);
+                inode->i_flags |= S_DEAD;
+                drop_nlink(dir);
+                error = 0;
+        }
+        mutex_unlock(&inode->i_mutex);
+        if (!error)
+                d_delete(dentry);
+        return error;
+}
+
+
+/* default file operations */
+static ssize_t default_read_file (struct file *file, char __user *buf,
+                                  size_t count, loff_t *ppos)
+{
+        return 0;
+}
+
+static ssize_t default_write_file (struct file *file, const char __user *buf,
+                                   size_t count, loff_t *ppos)
+{
+        return count;
+}
+
+static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
+{
+        loff_t retval = -EINVAL;
+
+        mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
+        switch(orig) {
+        case 0:
+                if (offset > 0) {
+                        file->f_pos = offset;
+                        retval = file->f_pos;
+                } 
+                break;
+        case 1:
+                if ((offset + file->f_pos) > 0) {
+                        file->f_pos += offset;
+                        retval = file->f_pos;
+                } 
+                break;
+        default:
+                break;
+        }
+        mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
+        return retval;
+}
+
+static int default_open (struct inode *inode, struct file *file)
+{
+        if (inode->i_private)
+                file->private_data = inode->i_private;
+
+        return 0;
+}
+
+static const struct file_operations default_file_operations = {
+        .read =         default_read_file,
+        .write =        default_write_file,
+        .open =         default_open,
+        .llseek =       default_file_lseek,
+};
+
+static const struct super_operations usbfs_ops = {
+        .statfs =       simple_statfs,
+        .drop_inode =   generic_delete_inode,
+        .remount_fs =   remount,
+        .show_options = usbfs_show_options,
+};
+
+static int usbfs_fill_super(struct super_block *sb, void *data, int silent)
+{
+        struct inode *inode;
+        struct dentry *root;
+
+        sb->s_blocksize = PAGE_CACHE_SIZE;
+        sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+        sb->s_magic = USBDEVICE_SUPER_MAGIC;
+        sb->s_op = &usbfs_ops;
+        sb->s_time_gran = 1;
+        inode = usbfs_get_inode(sb, S_IFDIR | 0755, 0);
+
+        if (!inode) {
+                dbg("%s: could not get inode!",__func__);
+                return -ENOMEM;
+        }
+
+        root = d_alloc_root(inode);
+        if (!root) {
+                dbg("%s: could not get root dentry!",__func__);
+                iput(inode);
+                return -ENOMEM;
+        }
+        sb->s_root = root;
+        return 0;
+}
+
+/*
+ * fs_create_by_name - create a file, given a name
+ * @name:       name of file
+ * @mode:       type of file
+ * @parent:     dentry of directory to create it in
+ * @dentry:     resulting dentry of file
+ *
+ * This function handles both regular files and directories.
+ */
+static int fs_create_by_name (const char *name, mode_t mode,
+                              struct dentry *parent, struct dentry **dentry)
+{
+        int error = 0;
+
+        /* If the parent is not specified, we create it in the root.
+         * We need the root dentry to do this, which is in the super 
+         * block. A pointer to that is in the struct vfsmount that we
+         * have around.
+         */
+        if (!parent ) {
+                if (usbfs_mount && usbfs_mount->mnt_sb) {
+                        parent = usbfs_mount->mnt_sb->s_root;
+                }
+        }
+
+        if (!parent) {
+                dbg("Ah! can not find a parent!");
+                return -EFAULT;
+        }
+
+        *dentry = NULL;
+        mutex_lock(&parent->d_inode->i_mutex);
+        *dentry = lookup_one_len(name, parent, strlen(name));
+        if (!IS_ERR(*dentry)) {
+                if ((mode & S_IFMT) == S_IFDIR)
+                        error = usbfs_mkdir (parent->d_inode, *dentry, mode);
+                else 
+                        error = usbfs_create (parent->d_inode, *dentry, mode);
+        } else
+                error = PTR_ERR(*dentry);
+        mutex_unlock(&parent->d_inode->i_mutex);
+
+        return error;
+}
+
+static struct dentry *fs_create_file (const char *name, mode_t mode,
+                                      struct dentry *parent, void *data,
+                                      const struct file_operations *fops,
+                                      uid_t uid, gid_t gid)
+{
+        struct dentry *dentry;
+        int error;
+
+        dbg("creating file '%s'",name);
+
+        error = fs_create_by_name (name, mode, parent, &dentry);
+        if (error) {
+                dentry = NULL;
+        } else {
+                if (dentry->d_inode) {
+                        if (data)
+                                dentry->d_inode->i_private = data;
+                        if (fops)
+                                dentry->d_inode->i_fop = fops;
+                        dentry->d_inode->i_uid = uid;
+                        dentry->d_inode->i_gid = gid;
+                }
+        }
+
+        return dentry;
+}
+
+static void fs_remove_file (struct dentry *dentry)
+{
+        struct dentry *parent = dentry->d_parent;
+        
+        if (!parent || !parent->d_inode)
+                return;
+
+        mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_PARENT);
+        if (usbfs_positive(dentry)) {
+                if (dentry->d_inode) {
+                        if (S_ISDIR(dentry->d_inode->i_mode))
+                                usbfs_rmdir(parent->d_inode, dentry);
+                        else
+                                usbfs_unlink(parent->d_inode, dentry);
+                dput(dentry);
+                }
+        }
+        mutex_unlock(&parent->d_inode->i_mutex);
+}
+
+/* --------------------------------------------------------------------- */
+
+static struct dentry *usb_mount(struct file_system_type *fs_type,
+        int flags, const char *dev_name, void *data)
+{
+        return mount_single(fs_type, flags, data, usbfs_fill_super);
+}
+
+static struct file_system_type usb_fs_type = {
+        .owner =        THIS_MODULE,
+        .name =         "usbfs",
+        .mount =        usb_mount,
+        .kill_sb =      kill_litter_super,
+};
+
+/* --------------------------------------------------------------------- */
+
+static int create_special_files (void)
+{
+        struct dentry *parent;
+        int retval;
+
+        /* the simple_pin_fs calls will call remount with no options
+         * without this flag that would overwrite the real mount options (if any)
+         */
+        ignore_mount = 1;
+
+        /* create the devices special file */
+        retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
+        if (retval) {
+                printk(KERN_ERR "Unable to get usbfs mount\n");
+                goto exit;
+        }
+
+        ignore_mount = 0;
+
+        parent = usbfs_mount->mnt_sb->s_root;
+        devices_usbfs_dentry = fs_create_file ("devices",
+                                               listmode | S_IFREG, parent,
+                                               NULL, &usbfs_devices_fops,
+                                               listuid, listgid);
+        if (devices_usbfs_dentry == NULL) {
+                printk(KERN_ERR "Unable to create devices usbfs file\n");
+                retval = -ENODEV;
+                goto error_clean_mounts;
+        }
+
+        goto exit;
+        
+error_clean_mounts:
+        simple_release_fs(&usbfs_mount, &usbfs_mount_count);
+exit:
+        return retval;
+}
+
+static void remove_special_files (void)
+{
+        if (devices_usbfs_dentry)
+                fs_remove_file (devices_usbfs_dentry);
+        devices_usbfs_dentry = NULL;
+        simple_release_fs(&usbfs_mount, &usbfs_mount_count);
+}
+
+void usbfs_update_special (void)
+{
+        struct inode *inode;
+
+        if (devices_usbfs_dentry) {
+                inode = devices_usbfs_dentry->d_inode;
+                if (inode)
+                        inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+        }
+}
+
+static void usbfs_add_bus(struct usb_bus *bus)
+{
+        struct dentry *parent;
+        char name[8];
+        int retval;
+
+        /* create the special files if this is the first bus added */
+        if (num_buses == 0) {
+                retval = create_special_files();
+                if (retval)
+                        return;
+        }
+        ++num_buses;
+
+        sprintf (name, "%03d", bus->busnum);
+
+        parent = usbfs_mount->mnt_sb->s_root;
+        bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
+                                            bus, NULL, busuid, busgid);
+        if (bus->usbfs_dentry == NULL) {
+                printk(KERN_ERR "Error creating usbfs bus entry\n");
+                return;
+        }
+}
+
+static void usbfs_remove_bus(struct usb_bus *bus)
+{
+        if (bus->usbfs_dentry) {
+                fs_remove_file (bus->usbfs_dentry);
+                bus->usbfs_dentry = NULL;
+        }
+
+        --num_buses;
+        if (num_buses <= 0) {
+                remove_special_files();
+                num_buses = 0;
+        }
+}
+
+static void usbfs_add_device(struct usb_device *dev)
+{
+        char name[8];
+        int i;
+        int i_size;
+
+        sprintf (name, "%03d", dev->devnum);
+        dev->usbfs_dentry = fs_create_file (name, devmode | S_IFREG,
+                                            dev->bus->usbfs_dentry, dev,
+                                            &usbdev_file_operations,
+                                            devuid, devgid);
+        if (dev->usbfs_dentry == NULL) {
+                printk(KERN_ERR "Error creating usbfs device entry\n");
+                return;
+        }
+
+        /* Set the size of the device's file to be
+         * equal to the size of the device descriptors. */
+        i_size = sizeof (struct usb_device_descriptor);
+        for (i = 0; i < dev->descriptor.bNumConfigurations; ++i) {
+                struct usb_config_descriptor *config =
+                        (struct usb_config_descriptor *)dev->rawdescriptors[i];
+                i_size += le16_to_cpu(config->wTotalLength);
+        }
+        if (dev->usbfs_dentry->d_inode)
+                dev->usbfs_dentry->d_inode->i_size = i_size;
+}
+
+static void usbfs_remove_device(struct usb_device *dev)
+{
+        if (dev->usbfs_dentry) {
+                fs_remove_file (dev->usbfs_dentry);
+                dev->usbfs_dentry = NULL;
+        }
+}
+
+static int usbfs_notify(struct notifier_block *self, unsigned long action, void *dev)
+{
+        switch (action) {
+        case USB_DEVICE_ADD:
+                usbfs_add_device(dev);
+                break;
+        case USB_DEVICE_REMOVE:
+                usbfs_remove_device(dev);
+                break;
+        case USB_BUS_ADD:
+                usbfs_add_bus(dev);
+                break;
+        case USB_BUS_REMOVE:
+                usbfs_remove_bus(dev);
+        }
+
+        usbfs_update_special();
+        usbfs_conn_disc_event();
+        return NOTIFY_OK;
+}
+
+static struct notifier_block usbfs_nb = {
+        .notifier_call =        usbfs_notify,
+};
+
+/* --------------------------------------------------------------------- */
+
+static struct proc_dir_entry *usbdir = NULL;
+
+int __init usbfs_init(void)
+{
+        int retval;
+
+        retval = register_filesystem(&usb_fs_type);
+        if (retval)
+                return retval;
+
+        usb_register_notify(&usbfs_nb);
+
+        /* create mount point for usbfs */
+        usbdir = proc_mkdir("bus/usb", NULL);
+
+        return 0;
+}
+
+void usbfs_cleanup(void)
+{
+        usb_unregister_notify(&usbfs_nb);
+        unregister_filesystem(&usb_fs_type);
+        if (usbdir)
+                remove_proc_entry("bus/usb", NULL);
+}
+