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   1 /******************************************************************************
   2  *  usbatm.c - Generic USB xDSL driver core
   3  *
   4  *  Copyright (C) 2001, Alcatel
   5  *  Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
   6  *  Copyright (C) 2004, David Woodhouse, Roman Kagan
   7  *
   8  *  This program is free software; you can redistribute it and/or modify it
   9  *  under the terms of the GNU General Public License as published by the Free
  10  *  Software Foundation; either version 2 of the License, or (at your option)
  11  *  any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but WITHOUT
  14  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  *  more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along with
  19  *  this program; if not, write to the Free Software Foundation, Inc., 59
  20  *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  ******************************************************************************/
  23
  24 /*
  25  *  Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
  26  *
  27  *  1.7+:       - See the check-in logs
  28  *
  29  *  1.6:        - No longer opens a connection if the firmware is not loaded
  30  *              - Added support for the speedtouch 330
  31  *              - Removed the limit on the number of devices
  32  *              - Module now autoloads on device plugin
  33  *              - Merged relevant parts of sarlib
  34  *              - Replaced the kernel thread with a tasklet
  35  *              - New packet transmission code
  36  *              - Changed proc file contents
  37  *              - Fixed all known SMP races
  38  *              - Many fixes and cleanups
  39  *              - Various fixes by Oliver Neukum (oliver@neukum.name)
  40  *
  41  *  1.5A:       - Version for inclusion in 2.5 series kernel
  42  *              - Modifications by Richard Purdie (rpurdie@rpsys.net)
  43  *              - made compatible with kernel 2.5.6 onwards by changing
  44  *              usbatm_usb_send_data_context->urb to a pointer and adding code
  45  *              to alloc and free it
  46  *              - remove_wait_queue() added to usbatm_atm_processqueue_thread()
  47  *
  48  *  1.5:        - fixed memory leak when atmsar_decode_aal5 returned NULL.
  49  *              (reported by stephen.robinson@zen.co.uk)
  50  *
  51  *  1.4:        - changed the spin_lock() under interrupt to spin_lock_irqsave()
  52  *              - unlink all active send urbs of a vcc that is being closed.
  53  *
  54  *  1.3.1:      - added the version number
  55  *
  56  *  1.3:        - Added multiple send urb support
  57  *              - fixed memory leak and vcc->tx_inuse starvation bug
  58  *                when not enough memory left in vcc.
  59  *
  60  *  1.2:        - Fixed race condition in usbatm_usb_send_data()
  61  *  1.1:        - Turned off packet debugging
  62  *
  63  */
  64
  65 #include "usbatm.h"
  66
  67 #include <asm/uaccess.h>
  68 #include <linux/crc32.h>
  69 #include <linux/errno.h>
  70 #include <linux/init.h>
  71 #include <linux/interrupt.h>
  72 #include <linux/kernel.h>
  73 #include <linux/module.h>
  74 #include <linux/moduleparam.h>
  75 #include <linux/netdevice.h>
  76 #include <linux/proc_fs.h>
  77 #include <linux/sched.h>
  78 #include <linux/signal.h>
  79 #include <linux/slab.h>
  80 #include <linux/stat.h>
  81 #include <linux/timer.h>
  82 #include <linux/wait.h>
  83
  84 #ifdef VERBOSE_DEBUG
  85 static int usbatm_print_packet(const unsigned char *data, int len);
  86 #define PACKETDEBUG(arg...)     usbatm_print_packet (arg)
  87 #define vdbg(arg...)            dbg (arg)
  88 #else
  89 #define PACKETDEBUG(arg...)
  90 #define vdbg(arg...)
  91 #endif
  92
  93 #define DRIVER_AUTHOR   "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
  94 #define DRIVER_VERSION  "1.10"
  95 #define DRIVER_DESC     "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
  96
  97 static const char usbatm_driver_name[] = "usbatm";
  98
  99 #define UDSL_MAX_RCV_URBS               16
 100 #define UDSL_MAX_SND_URBS               16
 101 #define UDSL_MAX_BUF_SIZE               65536
 102 #define UDSL_DEFAULT_RCV_URBS           4
 103 #define UDSL_DEFAULT_SND_URBS           4
 104 #define UDSL_DEFAULT_RCV_BUF_SIZE       3392    /* 64 * ATM_CELL_SIZE */
 105 #define UDSL_DEFAULT_SND_BUF_SIZE       3392    /* 64 * ATM_CELL_SIZE */
 106
 107 #define ATM_CELL_HEADER                 (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
 108
 109 #define THROTTLE_MSECS                  100     /* delay to recover processing after urb submission fails */
 110
 111 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
 112 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
 113 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
 114 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
 115
 116 module_param(num_rcv_urbs, uint, S_IRUGO);
 117 MODULE_PARM_DESC(num_rcv_urbs,
 118                  "Number of urbs used for reception (range: 0-"
 119                  __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
 120                  __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
 121
 122 module_param(num_snd_urbs, uint, S_IRUGO);
 123 MODULE_PARM_DESC(num_snd_urbs,
 124                  "Number of urbs used for transmission (range: 0-"
 125                  __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
 126                  __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
 127
 128 module_param(rcv_buf_bytes, uint, S_IRUGO);
 129 MODULE_PARM_DESC(rcv_buf_bytes,
 130                  "Size of the buffers used for reception, in bytes (range: 1-"
 131                  __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
 132                  __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
 133
 134 module_param(snd_buf_bytes, uint, S_IRUGO);
 135 MODULE_PARM_DESC(snd_buf_bytes,
 136                  "Size of the buffers used for transmission, in bytes (range: 1-"
 137                  __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
 138                  __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
 139
 140
 141 /* receive */
 142
 143 struct usbatm_vcc_data {
 144         /* vpi/vci lookup */
 145         struct list_head list;
 146         short vpi;
 147         int vci;
 148         struct atm_vcc *vcc;
 149
 150         /* raw cell reassembly */
 151         struct sk_buff *sarb;
 152 };
 153
 154
 155 /* send */
 156
 157 struct usbatm_control {
 158         struct atm_skb_data atm;
 159         u32 len;
 160         u32 crc;
 161 };
 162
 163 #define UDSL_SKB(x)             ((struct usbatm_control *)(x)->cb)
 164
 165
 166 /* ATM */
 167
 168 static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
 169 static int usbatm_atm_open(struct atm_vcc *vcc);
 170 static void usbatm_atm_close(struct atm_vcc *vcc);
 171 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
 172 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
 173 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
 174
 175 static struct atmdev_ops usbatm_atm_devops = {
 176         .dev_close      = usbatm_atm_dev_close,
 177         .open           = usbatm_atm_open,
 178         .close          = usbatm_atm_close,
 179         .ioctl          = usbatm_atm_ioctl,
 180         .send           = usbatm_atm_send,
 181         .proc_read      = usbatm_atm_proc_read,
 182         .owner          = THIS_MODULE,
 183 };
 184
 185
 186 /***********
 187 **  misc  **
 188 ***********/
 189
 190 static inline unsigned int usbatm_pdu_length(unsigned int length)
 191 {
 192         length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
 193         return length - length % ATM_CELL_PAYLOAD;
 194 }
 195
 196 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 197 {
 198         if (vcc->pop)
 199                 vcc->pop(vcc, skb);
 200         else
 201                 dev_kfree_skb_any(skb);
 202 }
 203
 204
 205 /***********
 206 **  urbs  **
 207 ************/
 208
 209 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
 210 {
 211         struct urb *urb;
 212
 213         spin_lock_irq(&channel->lock);
 214         if (list_empty(&channel->list)) {
 215                 spin_unlock_irq(&channel->lock);
 216                 return NULL;
 217         }
 218
 219         urb = list_entry(channel->list.next, struct urb, urb_list);
 220         list_del(&urb->urb_list);
 221         spin_unlock_irq(&channel->lock);
 222
 223         return urb;
 224 }
 225
 226 static int usbatm_submit_urb(struct urb *urb)
 227 {
 228         struct usbatm_channel *channel = urb->context;
 229         int ret;
 230
 231         vdbg("%s: submitting urb 0x%p, size %u",
 232              __func__, urb, urb->transfer_buffer_length);
 233
 234         ret = usb_submit_urb(urb, GFP_ATOMIC);
 235         if (ret) {
 236                 if (printk_ratelimit())
 237                         atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
 238                                 __func__, urb, ret);
 239
 240                 /* consider all errors transient and return the buffer back to the queue */
 241                 urb->status = -EAGAIN;
 242                 spin_lock_irq(&channel->lock);
 243
 244                 /* must add to the front when sending; doesn't matter when receiving */
 245                 list_add(&urb->urb_list, &channel->list);
 246
 247                 spin_unlock_irq(&channel->lock);
 248
 249                 /* make sure the channel doesn't stall */
 250                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 251         }
 252
 253         return ret;
 254 }
 255
 256 static void usbatm_complete(struct urb *urb)
 257 {
 258         struct usbatm_channel *channel = urb->context;
 259         unsigned long flags;
 260
 261         vdbg("%s: urb 0x%p, status %d, actual_length %d",
 262              __func__, urb, urb->status, urb->actual_length);
 263
 264         /* usually in_interrupt(), but not always */
 265         spin_lock_irqsave(&channel->lock, flags);
 266
 267         /* must add to the back when receiving; doesn't matter when sending */
 268         list_add_tail(&urb->urb_list, &channel->list);
 269
 270         spin_unlock_irqrestore(&channel->lock, flags);
 271
 272         if (unlikely(urb->status) &&
 273                         (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
 274                          urb->status != -EILSEQ ))
 275         {
 276                 if (urb->status == -ESHUTDOWN)
 277                         return;
 278
 279                 if (printk_ratelimit())
 280                         atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
 281                                 __func__, urb, urb->status);
 282                 /* throttle processing in case of an error */
 283                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
 284         } else
 285                 tasklet_schedule(&channel->tasklet);
 286 }
 287
 288
 289 /*************
 290 **  decode  **
 291 *************/
 292
 293 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
 294                                                   short vpi, int vci)
 295 {
 296         struct usbatm_vcc_data *vcc_data;
 297
 298         list_for_each_entry(vcc_data, &instance->vcc_list, list)
 299                 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
 300                         return vcc_data;
 301         return NULL;
 302 }
 303
 304 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
 305 {
 306         struct atm_vcc *vcc;
 307         struct sk_buff *sarb;
 308         short vpi = ((source[0] & 0x0f) << 4)  | (source[1] >> 4);
 309         int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
 310         u8 pti = ((source[3] & 0xe) >> 1);
 311
 312         vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
 313
 314         if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
 315                 instance->cached_vpi = vpi;
 316                 instance->cached_vci = vci;
 317
 318                 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
 319
 320                 if (!instance->cached_vcc)
 321                         atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
 322         }
 323
 324         if (!instance->cached_vcc)
 325                 return;
 326
 327         vcc = instance->cached_vcc->vcc;
 328
 329         /* OAM F5 end-to-end */
 330         if (pti == ATM_PTI_E2EF5) {
 331                 if (printk_ratelimit())
 332                         atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
 333                                 __func__, vpi, vci);
 334                 atomic_inc(&vcc->stats->rx_err);
 335                 return;
 336         }
 337
 338         sarb = instance->cached_vcc->sarb;
 339
 340         if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
 341                 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
 342                                 __func__, sarb->len, vcc);
 343                 /* discard cells already received */
 344                 skb_trim(sarb, 0);
 345                 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
 346         }
 347
 348         memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
 349         __skb_put(sarb, ATM_CELL_PAYLOAD);
 350
 351         if (pti & 1) {
 352                 struct sk_buff *skb;
 353                 unsigned int length;
 354                 unsigned int pdu_length;
 355
 356                 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
 357
 358                 /* guard against overflow */
 359                 if (length > ATM_MAX_AAL5_PDU) {
 360                         atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
 361                                   __func__, length, vcc);
 362                         atomic_inc(&vcc->stats->rx_err);
 363                         goto out;
 364                 }
 365
 366                 pdu_length = usbatm_pdu_length(length);
 367
 368                 if (sarb->len < pdu_length) {
 369                         atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
 370                                   __func__, pdu_length, sarb->len, vcc);
 371                         atomic_inc(&vcc->stats->rx_err);
 372                         goto out;
 373                 }
 374
 375                 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
 376                         atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
 377                                   __func__, vcc);
 378                         atomic_inc(&vcc->stats->rx_err);
 379                         goto out;
 380                 }
 381
 382                 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
 383
 384                 if (!(skb = dev_alloc_skb(length))) {
 385                         if (printk_ratelimit())
 386                                 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
 387                                         __func__, length);
 388                         atomic_inc(&vcc->stats->rx_drop);
 389                         goto out;
 390                 }
 391
 392                 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
 393
 394                 if (!atm_charge(vcc, skb->truesize)) {
 395                         atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
 396                                   __func__, skb->truesize);
 397                         dev_kfree_skb_any(skb);
 398                         goto out;       /* atm_charge increments rx_drop */
 399                 }
 400
 401                 skb_copy_to_linear_data(skb,
 402                                         skb_tail_pointer(sarb) - pdu_length,
 403                                         length);
 404                 __skb_put(skb, length);
 405
 406                 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
 407                      __func__, skb, skb->len, skb->truesize);
 408
 409                 PACKETDEBUG(skb->data, skb->len);
 410
 411                 vcc->push(vcc, skb);
 412
 413                 atomic_inc(&vcc->stats->rx);
 414         out:
 415                 skb_trim(sarb, 0);
 416         }
 417 }
 418
 419 static void usbatm_extract_cells(struct usbatm_data *instance,
 420                 unsigned char *source, unsigned int avail_data)
 421 {
 422         unsigned int stride = instance->rx_channel.stride;
 423         unsigned int buf_usage = instance->buf_usage;
 424
 425         /* extract cells from incoming data, taking into account that
 426          * the length of avail data may not be a multiple of stride */
 427
 428         if (buf_usage > 0) {
 429                 /* we have a partially received atm cell */
 430                 unsigned char *cell_buf = instance->cell_buf;
 431                 unsigned int space_left = stride - buf_usage;
 432
 433                 UDSL_ASSERT(buf_usage <= stride);
 434
 435                 if (avail_data >= space_left) {
 436                         /* add new data and process cell */
 437                         memcpy(cell_buf + buf_usage, source, space_left);
 438                         source += space_left;
 439                         avail_data -= space_left;
 440                         usbatm_extract_one_cell(instance, cell_buf);
 441                         instance->buf_usage = 0;
 442                 } else {
 443                         /* not enough data to fill the cell */
 444                         memcpy(cell_buf + buf_usage, source, avail_data);
 445                         instance->buf_usage = buf_usage + avail_data;
 446                         return;
 447                 }
 448         }
 449
 450         for (; avail_data >= stride; avail_data -= stride, source += stride)
 451                 usbatm_extract_one_cell(instance, source);
 452
 453         if (avail_data > 0) {
 454                 /* length was not a multiple of stride -
 455                  * save remaining data for next call */
 456                 memcpy(instance->cell_buf, source, avail_data);
 457                 instance->buf_usage = avail_data;
 458         }
 459 }
 460
 461
 462 /*************
 463 **  encode  **
 464 *************/
 465
 466 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
 467                                        struct sk_buff *skb,
 468                                        u8 *target, unsigned int avail_space)
 469 {
 470         struct usbatm_control *ctrl = UDSL_SKB(skb);
 471         struct atm_vcc *vcc = ctrl->atm.vcc;
 472         unsigned int bytes_written;
 473         unsigned int stride = instance->tx_channel.stride;
 474
 475         vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
 476         UDSL_ASSERT(!(avail_space % stride));
 477
 478         for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
 479              bytes_written += stride, target += stride) {
 480                 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
 481                 unsigned int left = ATM_CELL_PAYLOAD - data_len;
 482                 u8 *ptr = target;
 483
 484                 ptr[0] = vcc->vpi >> 4;
 485                 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
 486                 ptr[2] = vcc->vci >> 4;
 487                 ptr[3] = vcc->vci << 4;
 488                 ptr[4] = 0xec;
 489                 ptr += ATM_CELL_HEADER;
 490
 491                 skb_copy_from_linear_data(skb, ptr, data_len);
 492                 ptr += data_len;
 493                 __skb_pull(skb, data_len);
 494
 495                 if(!left)
 496                         continue;
 497
 498                 memset(ptr, 0, left);
 499
 500                 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
 501                         u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
 502                         /* trailer[0] = 0;              UU = 0 */
 503                         /* trailer[1] = 0;              CPI = 0 */
 504                         trailer[2] = ctrl->len >> 8;
 505                         trailer[3] = ctrl->len;
 506
 507                         ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
 508
 509                         trailer[4] = ctrl->crc >> 24;
 510                         trailer[5] = ctrl->crc >> 16;
 511                         trailer[6] = ctrl->crc >> 8;
 512                         trailer[7] = ctrl->crc;
 513
 514                         target[3] |= 0x2;       /* adjust PTI */
 515
 516                         ctrl->len = 0;          /* tag this skb finished */
 517                 }
 518                 else
 519                         ctrl->crc = crc32_be(ctrl->crc, ptr, left);
 520         }
 521
 522         return bytes_written;
 523 }
 524
 525
 526 /**************
 527 **  receive  **
 528 **************/
 529
 530 static void usbatm_rx_process(unsigned long data)
 531 {
 532         struct usbatm_data *instance = (struct usbatm_data *)data;
 533         struct urb *urb;
 534
 535         while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
 536                 vdbg("%s: processing urb 0x%p", __func__, urb);
 537
 538                 if (usb_pipeisoc(urb->pipe)) {
 539                         unsigned char *merge_start = NULL;
 540                         unsigned int merge_length = 0;
 541                         const unsigned int packet_size = instance->rx_channel.packet_size;
 542                         int i;
 543
 544                         for (i = 0; i < urb->number_of_packets; i++) {
 545                                 if (!urb->iso_frame_desc[i].status) {
 546                                         unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
 547
 548                                         UDSL_ASSERT(actual_length <= packet_size);
 549
 550                                         if (!merge_length)
 551                                                 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 552                                         merge_length += actual_length;
 553                                         if (merge_length && (actual_length < packet_size)) {
 554                                                 usbatm_extract_cells(instance, merge_start, merge_length);
 555                                                 merge_length = 0;
 556                                         }
 557                                 } else {
 558                                         atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
 559                                         if (merge_length)
 560                                                 usbatm_extract_cells(instance, merge_start, merge_length);
 561                                         merge_length = 0;
 562                                         instance->buf_usage = 0;
 563                                 }
 564                         }
 565
 566                         if (merge_length)
 567                                 usbatm_extract_cells(instance, merge_start, merge_length);
 568                 } else
 569                         if (!urb->status)
 570                                 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
 571                         else
 572                                 instance->buf_usage = 0;
 573
 574                 if (usbatm_submit_urb(urb))
 575                         return;
 576         }
 577 }
 578
 579
 580 /***********
 581 **  send  **
 582 ***********/
 583
 584 static void usbatm_tx_process(unsigned long data)
 585 {
 586         struct usbatm_data *instance = (struct usbatm_data *)data;
 587         struct sk_buff *skb = instance->current_skb;
 588         struct urb *urb = NULL;
 589         const unsigned int buf_size = instance->tx_channel.buf_size;
 590         unsigned int bytes_written = 0;
 591         u8 *buffer = NULL;
 592
 593         if (!skb)
 594                 skb = skb_dequeue(&instance->sndqueue);
 595
 596         while (skb) {
 597                 if (!urb) {
 598                         urb = usbatm_pop_urb(&instance->tx_channel);
 599                         if (!urb)
 600                                 break;          /* no more senders */
 601                         buffer = urb->transfer_buffer;
 602                         bytes_written = (urb->status == -EAGAIN) ?
 603                                 urb->transfer_buffer_length : 0;
 604                 }
 605
 606                 bytes_written += usbatm_write_cells(instance, skb,
 607                                                   buffer + bytes_written,
 608                                                   buf_size - bytes_written);
 609
 610                 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
 611                      __func__, bytes_written, skb, urb);
 612
 613                 if (!UDSL_SKB(skb)->len) {
 614                         struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
 615
 616                         usbatm_pop(vcc, skb);
 617                         atomic_inc(&vcc->stats->tx);
 618
 619                         skb = skb_dequeue(&instance->sndqueue);
 620                 }
 621
 622                 if (bytes_written == buf_size || (!skb && bytes_written)) {
 623                         urb->transfer_buffer_length = bytes_written;
 624
 625                         if (usbatm_submit_urb(urb))
 626                                 break;
 627                         urb = NULL;
 628                 }
 629         }
 630
 631         instance->current_skb = skb;
 632 }
 633
 634 static void usbatm_cancel_send(struct usbatm_data *instance,
 635                                struct atm_vcc *vcc)
 636 {
 637         struct sk_buff *skb, *n;
 638
 639         atm_dbg(instance, "%s entered\n", __func__);
 640         spin_lock_irq(&instance->sndqueue.lock);
 641         for (skb = instance->sndqueue.next, n = skb->next;
 642              skb != (struct sk_buff *)&instance->sndqueue;
 643              skb = n, n = skb->next)
 644                 if (UDSL_SKB(skb)->atm.vcc == vcc) {
 645                         atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
 646                         __skb_unlink(skb, &instance->sndqueue);
 647                         usbatm_pop(vcc, skb);
 648                 }
 649         spin_unlock_irq(&instance->sndqueue.lock);
 650
 651         tasklet_disable(&instance->tx_channel.tasklet);
 652         if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
 653                 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
 654                 instance->current_skb = NULL;
 655                 usbatm_pop(vcc, skb);
 656         }
 657         tasklet_enable(&instance->tx_channel.tasklet);
 658         atm_dbg(instance, "%s done\n", __func__);
 659 }
 660
 661 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
 662 {
 663         struct usbatm_data *instance = vcc->dev->dev_data;
 664         struct usbatm_control *ctrl = UDSL_SKB(skb);
 665         int err;
 666
 667         vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
 668
 669         /* racy disconnection check - fine */
 670         if (!instance || instance->disconnected) {
 671 #ifdef DEBUG
 672                 if (printk_ratelimit())
 673                         printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
 674 #endif
 675                 err = -ENODEV;
 676                 goto fail;
 677         }
 678
 679         if (vcc->qos.aal != ATM_AAL5) {
 680                 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 681                 err = -EINVAL;
 682                 goto fail;
 683         }
 684
 685         if (skb->len > ATM_MAX_AAL5_PDU) {
 686                 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
 687                                 __func__, skb->len, ATM_MAX_AAL5_PDU);
 688                 err = -EINVAL;
 689                 goto fail;
 690         }
 691
 692         PACKETDEBUG(skb->data, skb->len);
 693
 694         /* initialize the control block */
 695         ctrl->atm.vcc = vcc;
 696         ctrl->len = skb->len;
 697         ctrl->crc = crc32_be(~0, skb->data, skb->len);
 698
 699         skb_queue_tail(&instance->sndqueue, skb);
 700         tasklet_schedule(&instance->tx_channel.tasklet);
 701
 702         return 0;
 703
 704  fail:
 705         usbatm_pop(vcc, skb);
 706         return err;
 707 }
 708
 709
 710 /********************
 711 **  bean counting  **
 712 ********************/
 713
 714 static void usbatm_destroy_instance(struct kref *kref)
 715 {
 716         struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
 717
 718         dbg("%s", __func__);
 719
 720         tasklet_kill(&instance->rx_channel.tasklet);
 721         tasklet_kill(&instance->tx_channel.tasklet);
 722         usb_put_dev(instance->usb_dev);
 723         kfree(instance);
 724 }
 725
 726 static void usbatm_get_instance(struct usbatm_data *instance)
 727 {
 728         dbg("%s", __func__);
 729
 730         kref_get(&instance->refcount);
 731 }
 732
 733 static void usbatm_put_instance(struct usbatm_data *instance)
 734 {
 735         dbg("%s", __func__);
 736
 737         kref_put(&instance->refcount, usbatm_destroy_instance);
 738 }
 739
 740
 741 /**********
 742 **  ATM  **
 743 **********/
 744
 745 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
 746 {
 747         struct usbatm_data *instance = atm_dev->dev_data;
 748
 749         dbg("%s", __func__);
 750
 751         if (!instance)
 752                 return;
 753
 754         atm_dev->dev_data = NULL; /* catch bugs */
 755         usbatm_put_instance(instance);  /* taken in usbatm_atm_init */
 756 }
 757
 758 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
 759 {
 760         struct usbatm_data *instance = atm_dev->dev_data;
 761         int left = *pos;
 762
 763         if (!instance) {
 764                 dbg("%s: NULL instance!", __func__);
 765                 return -ENODEV;
 766         }
 767
 768         if (!left--)
 769                 return sprintf(page, "%s\n", instance->description);
 770
 771         if (!left--)
 772                 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
 773                                atm_dev->esi[0], atm_dev->esi[1],
 774                                atm_dev->esi[2], atm_dev->esi[3],
 775                                atm_dev->esi[4], atm_dev->esi[5]);
 776
 777         if (!left--)
 778                 return sprintf(page,
 779                                "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
 780                                atomic_read(&atm_dev->stats.aal5.tx),
 781                                atomic_read(&atm_dev->stats.aal5.tx_err),
 782                                atomic_read(&atm_dev->stats.aal5.rx),
 783                                atomic_read(&atm_dev->stats.aal5.rx_err),
 784                                atomic_read(&atm_dev->stats.aal5.rx_drop));
 785
 786         if (!left--) {
 787                 if (instance->disconnected)
 788                         return sprintf(page, "Disconnected\n");
 789                 else
 790                         switch (atm_dev->signal) {
 791                         case ATM_PHY_SIG_FOUND:
 792                                 return sprintf(page, "Line up\n");
 793                         case ATM_PHY_SIG_LOST:
 794                                 return sprintf(page, "Line down\n");
 795                         default:
 796                                 return sprintf(page, "Line state unknown\n");
 797                         }
 798         }
 799
 800         return 0;
 801 }
 802
 803 static int usbatm_atm_open(struct atm_vcc *vcc)
 804 {
 805         struct usbatm_data *instance = vcc->dev->dev_data;
 806         struct usbatm_vcc_data *new = NULL;
 807         int ret;
 808         int vci = vcc->vci;
 809         short vpi = vcc->vpi;
 810
 811         if (!instance) {
 812                 dbg("%s: NULL data!", __func__);
 813                 return -ENODEV;
 814         }
 815
 816         atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
 817
 818         /* only support AAL5 */
 819         if ((vcc->qos.aal != ATM_AAL5)) {
 820                 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
 821                 return -EINVAL;
 822         }
 823
 824         /* sanity checks */
 825         if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
 826                 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
 827                 return -EINVAL;
 828         }
 829
 830         mutex_lock(&instance->serialize);       /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
 831
 832         if (instance->disconnected) {
 833                 atm_dbg(instance, "%s: disconnected!\n", __func__);
 834                 ret = -ENODEV;
 835                 goto fail;
 836         }
 837
 838         if (usbatm_find_vcc(instance, vpi, vci)) {
 839                 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
 840                 ret = -EADDRINUSE;
 841                 goto fail;
 842         }
 843
 844         if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
 845                 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
 846                 ret = -ENOMEM;
 847                 goto fail;
 848         }
 849
 850         new->vcc = vcc;
 851         new->vpi = vpi;
 852         new->vci = vci;
 853
 854         new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
 855         if (!new->sarb) {
 856                 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
 857                 ret = -ENOMEM;
 858                 goto fail;
 859         }
 860
 861         vcc->dev_data = new;
 862
 863         tasklet_disable(&instance->rx_channel.tasklet);
 864         instance->cached_vcc = new;
 865         instance->cached_vpi = vpi;
 866         instance->cached_vci = vci;
 867         list_add(&new->list, &instance->vcc_list);
 868         tasklet_enable(&instance->rx_channel.tasklet);
 869
 870         set_bit(ATM_VF_ADDR, &vcc->flags);
 871         set_bit(ATM_VF_PARTIAL, &vcc->flags);
 872         set_bit(ATM_VF_READY, &vcc->flags);
 873
 874         mutex_unlock(&instance->serialize);
 875
 876         atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
 877
 878         return 0;
 879
 880 fail:
 881         kfree(new);
 882         mutex_unlock(&instance->serialize);
 883         return ret;
 884 }
 885
 886 static void usbatm_atm_close(struct atm_vcc *vcc)
 887 {
 888         struct usbatm_data *instance = vcc->dev->dev_data;
 889         struct usbatm_vcc_data *vcc_data = vcc->dev_data;
 890
 891         if (!instance || !vcc_data) {
 892                 dbg("%s: NULL data!", __func__);
 893                 return;
 894         }
 895
 896         atm_dbg(instance, "%s entered\n", __func__);
 897
 898         atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
 899                 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
 900
 901         usbatm_cancel_send(instance, vcc);
 902
 903         mutex_lock(&instance->serialize);       /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
 904
 905         tasklet_disable(&instance->rx_channel.tasklet);
 906         if (instance->cached_vcc == vcc_data) {
 907                 instance->cached_vcc = NULL;
 908                 instance->cached_vpi = ATM_VPI_UNSPEC;
 909                 instance->cached_vci = ATM_VCI_UNSPEC;
 910         }
 911         list_del(&vcc_data->list);
 912         tasklet_enable(&instance->rx_channel.tasklet);
 913
 914         kfree_skb(vcc_data->sarb);
 915         vcc_data->sarb = NULL;
 916
 917         kfree(vcc_data);
 918         vcc->dev_data = NULL;
 919
 920         vcc->vpi = ATM_VPI_UNSPEC;
 921         vcc->vci = ATM_VCI_UNSPEC;
 922         clear_bit(ATM_VF_READY, &vcc->flags);
 923         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 924         clear_bit(ATM_VF_ADDR, &vcc->flags);
 925
 926         mutex_unlock(&instance->serialize);
 927
 928         atm_dbg(instance, "%s successful\n", __func__);
 929 }
 930
 931 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
 932                           void __user * arg)
 933 {
 934         struct usbatm_data *instance = atm_dev->dev_data;
 935
 936         if (!instance || instance->disconnected) {
 937                 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
 938                 return -ENODEV;
 939         }
 940
 941         switch (cmd) {
 942         case ATM_QUERYLOOP:
 943                 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
 944         default:
 945                 return -ENOIOCTLCMD;
 946         }
 947 }
 948
 949 static int usbatm_atm_init(struct usbatm_data *instance)
 950 {
 951         struct atm_dev *atm_dev;
 952         int ret, i;
 953
 954         /* ATM init.  The ATM initialization scheme suffers from an intrinsic race
 955          * condition: callbacks we register can be executed at once, before we have
 956          * initialized the struct atm_dev.  To protect against this, all callbacks
 957          * abort if atm_dev->dev_data is NULL. */
 958         atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
 959         if (!atm_dev) {
 960                 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
 961                 return -1;
 962         }
 963
 964         instance->atm_dev = atm_dev;
 965
 966         atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
 967         atm_dev->ci_range.vci_bits = ATM_CI_MAX;
 968         atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
 969
 970         /* temp init ATM device, set to 128kbit */
 971         atm_dev->link_rate = 128 * 1000 / 424;
 972
 973         ret = sysfs_create_link(&atm_dev->class_dev.kobj,
 974                                 &instance->usb_intf->dev.kobj, "device");
 975         if (ret) {
 976                 atm_err(instance, "%s: sysfs_create_link failed: %d\n",
 977                                         __func__, ret);
 978                 goto fail_sysfs;
 979         }
 980
 981         if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
 982                 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
 983                 goto fail;
 984         }
 985
 986         usbatm_get_instance(instance);  /* dropped in usbatm_atm_dev_close */
 987
 988         /* ready for ATM callbacks */
 989         mb();
 990         atm_dev->dev_data = instance;
 991
 992         /* submit all rx URBs */
 993         for (i = 0; i < num_rcv_urbs; i++)
 994                 usbatm_submit_urb(instance->urbs[i]);
 995
 996         return 0;
 997
 998  fail:
 999         sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
1000  fail_sysfs:
1001         instance->atm_dev = NULL;
1002         atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
1003         return ret;
1004 }
1005
1006
1007 /**********
1008 **  USB  **
1009 **********/
1010
1011 static int usbatm_do_heavy_init(void *arg)
1012 {
1013         struct usbatm_data *instance = arg;
1014         int ret;
1015
1016         daemonize(instance->driver->driver_name);
1017         allow_signal(SIGTERM);
1018         instance->thread_pid = current->pid;
1019
1020         complete(&instance->thread_started);
1021
1022         ret = instance->driver->heavy_init(instance, instance->usb_intf);
1023
1024         if (!ret)
1025                 ret = usbatm_atm_init(instance);
1026
1027         mutex_lock(&instance->serialize);
1028         instance->thread_pid = -1;
1029         mutex_unlock(&instance->serialize);
1030
1031         complete_and_exit(&instance->thread_exited, ret);
1032 }
1033
1034 static int usbatm_heavy_init(struct usbatm_data *instance)
1035 {
1036         int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_FS | CLONE_FILES);
1037
1038         if (ret < 0) {
1039                 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
1040                 return ret;
1041         }
1042
1043         wait_for_completion(&instance->thread_started);
1044
1045         return 0;
1046 }
1047
1048 static void usbatm_tasklet_schedule(unsigned long data)
1049 {
1050         tasklet_schedule((struct tasklet_struct *) data);
1051 }
1052
1053 static void usbatm_init_channel(struct usbatm_channel *channel)
1054 {
1055         spin_lock_init(&channel->lock);
1056         INIT_LIST_HEAD(&channel->list);
1057         channel->delay.function = usbatm_tasklet_schedule;
1058         channel->delay.data = (unsigned long) &channel->tasklet;
1059         init_timer(&channel->delay);
1060 }
1061
1062 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1063                      struct usbatm_driver *driver)
1064 {
1065         struct device *dev = &intf->dev;
1066         struct usb_device *usb_dev = interface_to_usbdev(intf);
1067         struct usbatm_data *instance;
1068         char *buf;
1069         int error = -ENOMEM;
1070         int i, length;
1071         unsigned int maxpacket, num_packets;
1072
1073         dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1074                         __func__, driver->driver_name,
1075                         le16_to_cpu(usb_dev->descriptor.idVendor),
1076                         le16_to_cpu(usb_dev->descriptor.idProduct),
1077                         intf->altsetting->desc.bInterfaceNumber);
1078
1079         /* instance init */
1080         instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1081         if (!instance) {
1082                 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1083                 return -ENOMEM;
1084         }
1085
1086         /* public fields */
1087
1088         instance->driver = driver;
1089         snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1090
1091         instance->usb_dev = usb_dev;
1092         instance->usb_intf = intf;
1093
1094         buf = instance->description;
1095         length = sizeof(instance->description);
1096
1097         if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1098                 goto bind;
1099
1100         buf += i;
1101         length -= i;
1102
1103         i = scnprintf(buf, length, " (");
1104         buf += i;
1105         length -= i;
1106
1107         if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1108                 goto bind;
1109
1110         buf += i;
1111         length -= i;
1112
1113         snprintf(buf, length, ")");
1114
1115  bind:
1116         if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1117                         dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1118                         goto fail_free;
1119         }
1120
1121         /* private fields */
1122
1123         kref_init(&instance->refcount);         /* dropped in usbatm_usb_disconnect */
1124         mutex_init(&instance->serialize);
1125
1126         instance->thread_pid = -1;
1127         init_completion(&instance->thread_started);
1128         init_completion(&instance->thread_exited);
1129
1130         INIT_LIST_HEAD(&instance->vcc_list);
1131         skb_queue_head_init(&instance->sndqueue);
1132
1133         usbatm_init_channel(&instance->rx_channel);
1134         usbatm_init_channel(&instance->tx_channel);
1135         tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1136         tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1137         instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1138         instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1139         instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1140
1141         if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1142                 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1143         else
1144                 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1145
1146         instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1147
1148         /* tx buffer size must be a positive multiple of the stride */
1149         instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1150                         snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1151
1152         /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1153         maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1154
1155         if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1156                 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1157                                 usb_pipeendpoint(instance->rx_channel.endpoint));
1158                 error = -EINVAL;
1159                 goto fail_unbind;
1160         }
1161
1162         num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1163
1164         if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1165                 num_packets--;
1166
1167         instance->rx_channel.buf_size = num_packets * maxpacket;
1168         instance->rx_channel.packet_size = maxpacket;
1169
1170 #ifdef DEBUG
1171         for (i = 0; i < 2; i++) {
1172                 struct usbatm_channel *channel = i ?
1173                         &instance->tx_channel : &instance->rx_channel;
1174
1175                 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1176         }
1177 #endif
1178
1179         /* initialize urbs */
1180
1181         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1182                 u8 *buffer;
1183                 struct usbatm_channel *channel = i < num_rcv_urbs ?
1184                         &instance->rx_channel : &instance->tx_channel;
1185                 struct urb *urb;
1186                 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1187
1188                 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1189
1190                 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1191                 if (!urb) {
1192                         dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1193                         error = -ENOMEM;
1194                         goto fail_unbind;
1195                 }
1196
1197                 instance->urbs[i] = urb;
1198
1199                 /* zero the tx padding to avoid leaking information */
1200                 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1201                 if (!buffer) {
1202                         dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1203                         error = -ENOMEM;
1204                         goto fail_unbind;
1205                 }
1206
1207                 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1208                                   buffer, channel->buf_size, usbatm_complete, channel);
1209                 if (iso_packets) {
1210                         int j;
1211                         urb->interval = 1;
1212                         urb->transfer_flags = URB_ISO_ASAP;
1213                         urb->number_of_packets = iso_packets;
1214                         for (j = 0; j < iso_packets; j++) {
1215                                 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1216                                 urb->iso_frame_desc[j].length = channel->packet_size;
1217                         }
1218                 }
1219
1220                 /* put all tx URBs on the list of spares */
1221                 if (i >= num_rcv_urbs)
1222                         list_add_tail(&urb->urb_list, &channel->list);
1223
1224                 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1225                      __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1226         }
1227
1228         instance->cached_vpi = ATM_VPI_UNSPEC;
1229         instance->cached_vci = ATM_VCI_UNSPEC;
1230         instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1231
1232         if (!instance->cell_buf) {
1233                 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1234                 error = -ENOMEM;
1235                 goto fail_unbind;
1236         }
1237
1238         if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1239                 error = usbatm_heavy_init(instance);
1240         } else {
1241                 complete(&instance->thread_exited);     /* pretend that heavy_init was run */
1242                 error = usbatm_atm_init(instance);
1243         }
1244
1245         if (error < 0)
1246                 goto fail_unbind;
1247
1248         usb_get_dev(usb_dev);
1249         usb_set_intfdata(intf, instance);
1250
1251         return 0;
1252
1253  fail_unbind:
1254         if (instance->driver->unbind)
1255                 instance->driver->unbind(instance, intf);
1256  fail_free:
1257         kfree(instance->cell_buf);
1258
1259         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1260                 if (instance->urbs[i])
1261                         kfree(instance->urbs[i]->transfer_buffer);
1262                 usb_free_urb(instance->urbs[i]);
1263         }
1264
1265         kfree (instance);
1266
1267         return error;
1268 }
1269 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1270
1271 void usbatm_usb_disconnect(struct usb_interface *intf)
1272 {
1273         struct device *dev = &intf->dev;
1274         struct usbatm_data *instance = usb_get_intfdata(intf);
1275         struct usbatm_vcc_data *vcc_data;
1276         int i;
1277
1278         dev_dbg(dev, "%s entered\n", __func__);
1279
1280         if (!instance) {
1281                 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1282                 return;
1283         }
1284
1285         usb_set_intfdata(intf, NULL);
1286
1287         mutex_lock(&instance->serialize);
1288         instance->disconnected = 1;
1289         if (instance->thread_pid >= 0)
1290                 kill_proc(instance->thread_pid, SIGTERM, 1);
1291         mutex_unlock(&instance->serialize);
1292
1293         wait_for_completion(&instance->thread_exited);
1294
1295         mutex_lock(&instance->serialize);
1296         list_for_each_entry(vcc_data, &instance->vcc_list, list)
1297                 vcc_release_async(vcc_data->vcc, -EPIPE);
1298         mutex_unlock(&instance->serialize);
1299
1300         tasklet_disable(&instance->rx_channel.tasklet);
1301         tasklet_disable(&instance->tx_channel.tasklet);
1302
1303         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1304                 usb_kill_urb(instance->urbs[i]);
1305
1306         del_timer_sync(&instance->rx_channel.delay);
1307         del_timer_sync(&instance->tx_channel.delay);
1308
1309         /* turn usbatm_[rt]x_process into something close to a no-op */
1310         /* no need to take the spinlock */
1311         INIT_LIST_HEAD(&instance->rx_channel.list);
1312         INIT_LIST_HEAD(&instance->tx_channel.list);
1313
1314         tasklet_enable(&instance->rx_channel.tasklet);
1315         tasklet_enable(&instance->tx_channel.tasklet);
1316
1317         if (instance->atm_dev && instance->driver->atm_stop)
1318                 instance->driver->atm_stop(instance, instance->atm_dev);
1319
1320         if (instance->driver->unbind)
1321                 instance->driver->unbind(instance, intf);
1322
1323         instance->driver_data = NULL;
1324
1325         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1326                 kfree(instance->urbs[i]->transfer_buffer);
1327                 usb_free_urb(instance->urbs[i]);
1328         }
1329
1330         kfree(instance->cell_buf);
1331
1332         /* ATM finalize */
1333         if (instance->atm_dev) {
1334                 sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");
1335                 atm_dev_deregister(instance->atm_dev);
1336         }
1337
1338         usbatm_put_instance(instance);  /* taken in usbatm_usb_probe */
1339 }
1340 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1341
1342
1343 /***********
1344 **  init  **
1345 ***********/
1346
1347 static int __init usbatm_usb_init(void)
1348 {
1349         dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1350
1351         if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1352                 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1353                 return -EIO;
1354         }
1355
1356         if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1357             || (num_snd_urbs > UDSL_MAX_SND_URBS)
1358             || (rcv_buf_bytes < 1)
1359             || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1360             || (snd_buf_bytes < 1)
1361             || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1362                 return -EINVAL;
1363
1364         return 0;
1365 }
1366 module_init(usbatm_usb_init);
1367
1368 static void __exit usbatm_usb_exit(void)
1369 {
1370         dbg("%s", __func__);
1371 }
1372 module_exit(usbatm_usb_exit);
1373
1374 MODULE_AUTHOR(DRIVER_AUTHOR);
1375 MODULE_DESCRIPTION(DRIVER_DESC);
1376 MODULE_LICENSE("GPL");
1377 MODULE_VERSION(DRIVER_VERSION);
1378
1379 /************
1380 **  debug  **
1381 ************/
1382
1383 #ifdef VERBOSE_DEBUG
1384 static int usbatm_print_packet(const unsigned char *data, int len)
1385 {
1386         unsigned char buffer[256];
1387         int i = 0, j = 0;
1388
1389         for (i = 0; i < len;) {
1390                 buffer[0] = '\0';
1391                 sprintf(buffer, "%.3d :", i);
1392                 for (j = 0; (j < 16) && (i < len); j++, i++) {
1393                         sprintf(buffer, "%s %2.2x", buffer, data[i]);
1394                 }
1395                 dbg("%s", buffer);
1396         }
1397         return i;
1398 }
1399 #endif