drivers/staging/keucr/transport.c

   1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   2
   3 #include <linux/sched.h>
   4 #include <linux/errno.h>
   5 #include <linux/slab.h>
   6
   7 #include <scsi/scsi.h>
   8 #include <scsi/scsi_eh.h>
   9 #include <scsi/scsi_device.h>
  10
  11 #include "usb.h"
  12 #include "scsiglue.h"
  13 #include "transport.h"
  14
  15 /***********************************************************************
  16  * Data transfer routines
  17  ***********************************************************************/
  18 /*
  19  * usb_stor_blocking_completion()
  20  */
  21 static void usb_stor_blocking_completion(struct urb *urb)
  22 {
  23         struct completion *urb_done_ptr = urb->context;
  24
  25         /* pr_info("transport --- usb_stor_blocking_completion\n"); */
  26         complete(urb_done_ptr);
  27 }
  28
  29 /*
  30  * usb_stor_msg_common()
  31  */
  32 static int usb_stor_msg_common(struct us_data *us, int timeout)
  33 {
  34         struct completion urb_done;
  35         long timeleft;
  36         int status;
  37
  38         /* pr_info("transport --- usb_stor_msg_common\n"); */
  39         if (test_bit(US_FLIDX_ABORTING, &us->dflags))
  40                 return -EIO;
  41
  42         init_completion(&urb_done);
  43
  44         us->current_urb->context = &urb_done;
  45         us->current_urb->actual_length = 0;
  46         us->current_urb->error_count = 0;
  47         us->current_urb->status = 0;
  48
  49         us->current_urb->transfer_flags = 0;
  50         if (us->current_urb->transfer_buffer == us->iobuf)
  51                 us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
  52         us->current_urb->transfer_dma = us->iobuf_dma;
  53         us->current_urb->setup_dma = us->cr_dma;
  54
  55         status = usb_submit_urb(us->current_urb, GFP_NOIO);
  56         if (status)
  57                 return status;
  58
  59         set_bit(US_FLIDX_URB_ACTIVE, &us->dflags);
  60
  61         if (test_bit(US_FLIDX_ABORTING, &us->dflags)) {
  62                 if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) {
  63                         /* pr_info("-- cancelling URB\n"); */
  64                         usb_unlink_urb(us->current_urb);
  65                 }
  66         }
  67
  68         timeleft = wait_for_completion_interruptible_timeout(&urb_done,
  69                                         timeout ? : MAX_SCHEDULE_TIMEOUT);
  70         clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags);
  71
  72         if (timeleft <= 0) {
  73                 /* pr_info("%s -- cancelling URB\n",
  74                         timeleft == 0 ? "Timeout" : "Signal"); */
  75                 usb_kill_urb(us->current_urb);
  76         }
  77
  78         return us->current_urb->status;
  79 }
  80
  81 /*
  82  * usb_stor_print_cmd():
  83  */
  84 static void usb_stor_print_cmd(struct us_data *us, struct scsi_cmnd *srb)
  85 {
  86         u8 *Cdb = srb->cmnd;
  87         u32   cmd = Cdb[0];
  88
  89         switch (cmd) {
  90         case TEST_UNIT_READY:
  91                 break;
  92         case INQUIRY:
  93                 dev_dbg(&us->pusb_dev->dev,
  94                                 "scsi cmd %X --- SCSIOP_INQUIRY\n", cmd);
  95                 break;
  96         case MODE_SENSE:
  97                 dev_dbg(&us->pusb_dev->dev,
  98                                 "scsi cmd %X --- SCSIOP_MODE_SENSE\n", cmd);
  99                 break;
 100         case START_STOP:
 101                 dev_dbg(&us->pusb_dev->dev,
 102                                 "scsi cmd %X --- SCSIOP_START_STOP\n", cmd);
 103                 break;
 104         case READ_CAPACITY:
 105                 dev_dbg(&us->pusb_dev->dev,
 106                                 "scsi cmd %X --- SCSIOP_READ_CAPACITY\n", cmd);
 107                 break;
 108         case READ_10:
 109                 break;
 110         case WRITE_10:
 111                 break;
 112         case ALLOW_MEDIUM_REMOVAL:
 113                 dev_dbg(&us->pusb_dev->dev,
 114                         "scsi cmd %X --- SCSIOP_ALLOW_MEDIUM_REMOVAL\n", cmd);
 115                 break;
 116         default:
 117                 dev_dbg(&us->pusb_dev->dev, "scsi cmd %X --- Other cmd\n", cmd);
 118                 break;
 119         }
 120 }
 121
 122 /*
 123  * usb_stor_control_msg()
 124  */
 125 int usb_stor_control_msg(struct us_data *us, unsigned int pipe,
 126                  u8 request, u8 requesttype, u16 value, u16 index,
 127                  void *data, u16 size, int timeout)
 128 {
 129         int status;
 130
 131         /* pr_info("transport --- usb_stor_control_msg\n"); */
 132
 133         /* fill in the devrequest structure */
 134         us->cr->bRequestType = requesttype;
 135         us->cr->bRequest = request;
 136         us->cr->wValue = cpu_to_le16(value);
 137         us->cr->wIndex = cpu_to_le16(index);
 138         us->cr->wLength = cpu_to_le16(size);
 139
 140         /* fill and submit the URB */
 141         usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe,
 142                          (unsigned char *) us->cr, data, size,
 143                          usb_stor_blocking_completion, NULL);
 144         status = usb_stor_msg_common(us, timeout);
 145
 146         /* return the actual length of the data transferred if no error */
 147         if (status == 0)
 148                 status = us->current_urb->actual_length;
 149         return status;
 150 }
 151
 152 /*
 153  * usb_stor_clear_halt()
 154  */
 155 int usb_stor_clear_halt(struct us_data *us, unsigned int pipe)
 156 {
 157         int result;
 158         int endp = usb_pipeendpoint(pipe);
 159
 160         /* pr_info("transport --- usb_stor_clear_halt\n"); */
 161         if (usb_pipein(pipe))
 162                 endp |= USB_DIR_IN;
 163
 164         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 165                 USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
 166                 USB_ENDPOINT_HALT, endp,
 167                 NULL, 0, 3*HZ);
 168
 169         /* reset the endpoint toggle */
 170         if (result >= 0)
 171                 /* usb_settoggle(us->pusb_dev, usb_pipeendpoint(pipe),
 172                                                 usb_pipeout(pipe), 0); */
 173                 usb_reset_endpoint(us->pusb_dev, endp);
 174
 175         return result;
 176 }
 177
 178 /*
 179  * interpret_urb_result()
 180  */
 181 static int interpret_urb_result(struct us_data *us, unsigned int pipe,
 182                 unsigned int length, int result, unsigned int partial)
 183 {
 184         /* pr_info("transport --- interpret_urb_result\n"); */
 185         switch (result) {
 186         /* no error code; did we send all the data? */
 187         case 0:
 188                 if (partial != length) {
 189                         /* pr_info("-- short transfer\n"); */
 190                         return USB_STOR_XFER_SHORT;
 191                 }
 192                 /* pr_info("-- transfer complete\n"); */
 193                 return USB_STOR_XFER_GOOD;
 194         case -EPIPE:
 195                 if (usb_pipecontrol(pipe)) {
 196                         /* pr_info("-- stall on control pipe\n"); */
 197                         return USB_STOR_XFER_STALLED;
 198                 }
 199                 /* pr_info("clearing endpoint halt for pipe 0x%x\n", pipe); */
 200                 if (usb_stor_clear_halt(us, pipe) < 0)
 201                         return USB_STOR_XFER_ERROR;
 202                 return USB_STOR_XFER_STALLED;
 203         case -EOVERFLOW:
 204                 /* pr_info("-- babble\n"); */
 205                 return USB_STOR_XFER_LONG;
 206         case -ECONNRESET:
 207                 /* pr_info("-- transfer cancelled\n"); */
 208                 return USB_STOR_XFER_ERROR;
 209         case -EREMOTEIO:
 210                 /* pr_info("-- short read transfer\n"); */
 211                 return USB_STOR_XFER_SHORT;
 212         case -EIO:
 213                 /* pr_info("-- abort or disconnect in progress\n"); */
 214                 return USB_STOR_XFER_ERROR;
 215         default:
 216                 /* pr_info("-- unknown error\n"); */
 217                 return USB_STOR_XFER_ERROR;
 218         }
 219 }
 220
 221 /*
 222  * usb_stor_bulk_transfer_buf()
 223  */
 224 int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe,
 225         void *buf, unsigned int length, unsigned int *act_len)
 226 {
 227         int result;
 228
 229         /* pr_info("transport --- usb_stor_bulk_transfer_buf\n"); */
 230
 231         /* fill and submit the URB */
 232         usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf,
 233                                 length, usb_stor_blocking_completion, NULL);
 234         result = usb_stor_msg_common(us, 0);
 235
 236         /* store the actual length of the data transferred */
 237         if (act_len)
 238                 *act_len = us->current_urb->actual_length;
 239
 240         return interpret_urb_result(us, pipe, length, result,
 241                                         us->current_urb->actual_length);
 242 }
 243
 244 /*
 245  * usb_stor_bulk_transfer_sglist()
 246  */
 247 static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe,
 248                 struct scatterlist *sg, int num_sg, unsigned int length,
 249                 unsigned int *act_len)
 250 {
 251         int result;
 252
 253         /* pr_info("transport --- usb_stor_bulk_transfer_sglist\n"); */
 254         if (test_bit(US_FLIDX_ABORTING, &us->dflags))
 255                 return USB_STOR_XFER_ERROR;
 256
 257         /* initialize the scatter-gather request block */
 258         result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0,
 259                                         sg, num_sg, length, GFP_NOIO);
 260         if (result) {
 261                 /* pr_info("usb_sg_init returned %d\n", result); */
 262                 return USB_STOR_XFER_ERROR;
 263         }
 264
 265         /* since the block has been initialized successfully,
 266                                         it's now okay to cancel it */
 267         set_bit(US_FLIDX_SG_ACTIVE, &us->dflags);
 268
 269         /* did an abort/disconnect occur during the submission? */
 270         if (test_bit(US_FLIDX_ABORTING, &us->dflags)) {
 271                 /* cancel the request, if it hasn't been cancelled already */
 272                 if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) {
 273                         /* pr_info("-- cancelling sg request\n"); */
 274                         usb_sg_cancel(&us->current_sg);
 275                 }
 276         }
 277
 278         /* wait for the completion of the transfer */
 279         usb_sg_wait(&us->current_sg);
 280         clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags);
 281
 282         result = us->current_sg.status;
 283         if (act_len)
 284                 *act_len = us->current_sg.bytes;
 285
 286         return interpret_urb_result(us, pipe, length,
 287                                         result, us->current_sg.bytes);
 288 }
 289
 290 /*
 291  * usb_stor_bulk_srb()
 292  */
 293 int usb_stor_bulk_srb(struct us_data *us, unsigned int pipe,
 294                                         struct scsi_cmnd *srb)
 295 {
 296         unsigned int partial;
 297         int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb),
 298                                       scsi_sg_count(srb), scsi_bufflen(srb),
 299                                       &partial);
 300
 301         scsi_set_resid(srb, scsi_bufflen(srb) - partial);
 302         return result;
 303 }
 304
 305 /*
 306  * usb_stor_bulk_transfer_sg()
 307  */
 308 int usb_stor_bulk_transfer_sg(struct us_data *us, unsigned int pipe,
 309                 void *buf, unsigned int length_left, int use_sg, int *residual)
 310 {
 311         int result;
 312         unsigned int partial;
 313
 314         /* pr_info("transport --- usb_stor_bulk_transfer_sg\n"); */
 315         /* are we scatter-gathering? */
 316         if (use_sg) {
 317                 /* use the usb core scatter-gather primitives */
 318                 result = usb_stor_bulk_transfer_sglist(us, pipe,
 319                                 (struct scatterlist *) buf, use_sg,
 320                                 length_left, &partial);
 321                 length_left -= partial;
 322         } else {
 323                 /* no scatter-gather, just make the request */
 324                 result = usb_stor_bulk_transfer_buf(us, pipe, buf,
 325                                                         length_left, &partial);
 326                 length_left -= partial;
 327         }
 328
 329         /* store the residual and return the error code */
 330         if (residual)
 331                 *residual = length_left;
 332         return result;
 333 }
 334
 335 /***********************************************************************
 336  * Transport routines
 337  ***********************************************************************/
 338 /*
 339  * usb_stor_invoke_transport()
 340  */
 341 void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
 342 {
 343         int need_auto_sense;
 344         int result;
 345
 346         /* pr_info("transport --- usb_stor_invoke_transport\n"); */
 347         usb_stor_print_cmd(us, srb);
 348         /* send the command to the transport layer */
 349         scsi_set_resid(srb, 0);
 350         result = us->transport(srb, us); /* usb_stor_Bulk_transport; */
 351
 352         /* if the command gets aborted by the higher layers,
 353                 we need to short-circuit all other processing */
 354         if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 355                 /* pr_info("-- command was aborted\n"); */
 356                 srb->result = DID_ABORT << 16;
 357                 goto Handle_Errors;
 358         }
 359
 360         /* if there is a transport error, reset and don't auto-sense */
 361         if (result == USB_STOR_TRANSPORT_ERROR) {
 362                 /* pr_info("-- transport indicates error, resetting\n"); */
 363                 srb->result = DID_ERROR << 16;
 364                 goto Handle_Errors;
 365         }
 366
 367         /* if the transport provided its own sense data, don't auto-sense */
 368         if (result == USB_STOR_TRANSPORT_NO_SENSE) {
 369                 srb->result = SAM_STAT_CHECK_CONDITION;
 370                 return;
 371         }
 372
 373         srb->result = SAM_STAT_GOOD;
 374
 375         /* Determine if we need to auto-sense */
 376         need_auto_sense = 0;
 377
 378         if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) &&
 379                                 srb->sc_data_direction != DMA_FROM_DEVICE) {
 380                 /* pr_info("-- CB transport device requiring auto-sense\n"); */
 381                 need_auto_sense = 1;
 382         }
 383
 384         if (result == USB_STOR_TRANSPORT_FAILED) {
 385                 /* pr_info("-- transport indicates command failure\n"); */
 386                 need_auto_sense = 1;
 387         }
 388
 389         /* Now, if we need to do the auto-sense, let's do it */
 390         if (need_auto_sense) {
 391                 int temp_result;
 392                 struct scsi_eh_save ses;
 393
 394                 pr_info("Issuing auto-REQUEST_SENSE\n");
 395
 396                 scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE);
 397
 398                 /* we must do the protocol translation here */
 399                 if (us->subclass == USB_SC_RBC ||
 400                         us->subclass == USB_SC_SCSI ||
 401                         us->subclass == USB_SC_CYP_ATACB) {
 402                         srb->cmd_len = 6;
 403                 } else {
 404                         srb->cmd_len = 12;
 405                 }
 406                 /* issue the auto-sense command */
 407                 scsi_set_resid(srb, 0);
 408                 temp_result = us->transport(us->srb, us);
 409
 410                 /* let's clean up right away */
 411                 scsi_eh_restore_cmnd(srb, &ses);
 412
 413                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 414                         /* pr_info("-- auto-sense aborted\n"); */
 415                         srb->result = DID_ABORT << 16;
 416                         goto Handle_Errors;
 417                 }
 418                 if (temp_result != USB_STOR_TRANSPORT_GOOD) {
 419                         /* pr_info("-- auto-sense failure\n"); */
 420                         srb->result = DID_ERROR << 16;
 421                         if (!(us->fflags & US_FL_SCM_MULT_TARG))
 422                                 goto Handle_Errors;
 423                         return;
 424                 }
 425
 426                 /* set the result so the higher layers expect this data */
 427                 srb->result = SAM_STAT_CHECK_CONDITION;
 428
 429                 if (result == USB_STOR_TRANSPORT_GOOD &&
 430                         (srb->sense_buffer[2] & 0xaf) == 0 &&
 431                         srb->sense_buffer[12] == 0 &&
 432                         srb->sense_buffer[13] == 0) {
 433                         srb->result = SAM_STAT_GOOD;
 434                         srb->sense_buffer[0] = 0x0;
 435                 }
 436         }
 437
 438         /* Did we transfer less than the minimum amount required? */
 439         if (srb->result == SAM_STAT_GOOD && scsi_bufflen(srb) -
 440                                 scsi_get_resid(srb) < srb->underflow)
 441                 srb->result = (DID_ERROR << 16);
 442                 /* v02 | (SUGGEST_RETRY << 24); */
 443
 444         return;
 445
 446 Handle_Errors:
 447         scsi_lock(us_to_host(us));
 448         set_bit(US_FLIDX_RESETTING, &us->dflags);
 449         clear_bit(US_FLIDX_ABORTING, &us->dflags);
 450         scsi_unlock(us_to_host(us));
 451
 452         mutex_unlock(&us->dev_mutex);
 453         result = usb_stor_port_reset(us);
 454         mutex_lock(&us->dev_mutex);
 455
 456         if (result < 0) {
 457                 scsi_lock(us_to_host(us));
 458                 usb_stor_report_device_reset(us);
 459                 scsi_unlock(us_to_host(us));
 460                 us->transport_reset(us);
 461         }
 462         clear_bit(US_FLIDX_RESETTING, &us->dflags);
 463 }
 464
 465 /*
 466  * ENE_stor_invoke_transport()
 467  */
 468 void ENE_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
 469 {
 470         int result = 0;
 471
 472         /* pr_info("transport --- ENE_stor_invoke_transport\n"); */
 473         usb_stor_print_cmd(us, srb);
 474         /* send the command to the transport layer */
 475         scsi_set_resid(srb, 0);
 476         if (!(us->SM_Status.Ready))
 477                 result = ENE_InitMedia(us);
 478
 479         if (us->Power_IsResum == true) {
 480                 result = ENE_InitMedia(us);
 481                 us->Power_IsResum = false;
 482         }
 483
 484         if (us->SM_Status.Ready)
 485                 result = SM_SCSIIrp(us, srb);
 486
 487         /* if the command gets aborted by the higher layers,
 488                 we need to short-circuit all other processing */
 489         if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 490                 /* pr_info("-- command was aborted\n"); */
 491                 srb->result = DID_ABORT << 16;
 492                 goto Handle_Errors;
 493         }
 494
 495         /* if there is a transport error, reset and don't auto-sense */
 496         if (result == USB_STOR_TRANSPORT_ERROR) {
 497                 /* pr_info("-- transport indicates error, resetting\n"); */
 498                 srb->result = DID_ERROR << 16;
 499                 goto Handle_Errors;
 500         }
 501
 502         /* if the transport provided its own sense data, don't auto-sense */
 503         if (result == USB_STOR_TRANSPORT_NO_SENSE) {
 504                 srb->result = SAM_STAT_CHECK_CONDITION;
 505                 return;
 506         }
 507
 508         srb->result = SAM_STAT_GOOD;
 509         if (result == USB_STOR_TRANSPORT_FAILED) {
 510                 /* pr_info("-- transport indicates command failure\n"); */
 511                 /* need_auto_sense = 1; */
 512                 BuildSenseBuffer(srb, us->SrbStatus);
 513                 srb->result = SAM_STAT_CHECK_CONDITION;
 514         }
 515
 516         /* Did we transfer less than the minimum amount required? */
 517         if (srb->result == SAM_STAT_GOOD && scsi_bufflen(srb) -
 518                                         scsi_get_resid(srb) < srb->underflow)
 519                 srb->result = (DID_ERROR << 16);
 520                 /* v02 | (SUGGEST_RETRY << 24); */
 521
 522         return;
 523
 524 Handle_Errors:
 525         scsi_lock(us_to_host(us));
 526         set_bit(US_FLIDX_RESETTING, &us->dflags);
 527         clear_bit(US_FLIDX_ABORTING, &us->dflags);
 528         scsi_unlock(us_to_host(us));
 529
 530         mutex_unlock(&us->dev_mutex);
 531         result = usb_stor_port_reset(us);
 532         mutex_lock(&us->dev_mutex);
 533
 534         if (result < 0) {
 535                 scsi_lock(us_to_host(us));
 536                 usb_stor_report_device_reset(us);
 537                 scsi_unlock(us_to_host(us));
 538                 us->transport_reset(us);
 539         }
 540         clear_bit(US_FLIDX_RESETTING, &us->dflags);
 541 }
 542
 543 /*
 544  * BuildSenseBuffer()
 545  */
 546 void BuildSenseBuffer(struct scsi_cmnd *srb, int SrbStatus)
 547 {
 548         u8    *buf = srb->sense_buffer;
 549         u8    asc;
 550
 551         pr_info("transport --- BuildSenseBuffer\n");
 552         switch (SrbStatus) {
 553         case SS_NOT_READY:
 554                 asc = 0x3a;
 555                 break;  /*  sense key = 0x02 */
 556         case SS_MEDIUM_ERR:
 557                 asc = 0x0c;
 558                 break;  /*  sense key = 0x03 */
 559         case SS_ILLEGAL_REQUEST:
 560                 asc = 0x20;
 561                 break;  /*  sense key = 0x05 */
 562         default:
 563                 asc = 0x00;
 564                 break;  /*  ?? */
 565         }
 566
 567         memset(buf, 0, 18);
 568         buf[0x00] = 0xf0;
 569         buf[0x02] = SrbStatus;
 570         buf[0x07] = 0x0b;
 571         buf[0x0c] = asc;
 572 }
 573
 574 /*
 575  * usb_stor_stop_transport()
 576  */
 577 void usb_stor_stop_transport(struct us_data *us)
 578 {
 579         /* pr_info("transport --- usb_stor_stop_transport\n"); */
 580
 581         if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) {
 582                 /* pr_info("-- cancelling URB\n"); */
 583                 usb_unlink_urb(us->current_urb);
 584         }
 585
 586         if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) {
 587                 /* pr_info("-- cancelling sg request\n"); */
 588                 usb_sg_cancel(&us->current_sg);
 589         }
 590 }
 591
 592 /*
 593  * usb_stor_Bulk_max_lun()
 594  */
 595 int usb_stor_Bulk_max_lun(struct us_data *us)
 596 {
 597         int result;
 598
 599         /* pr_info("transport --- usb_stor_Bulk_max_lun\n"); */
 600         /* issue the command */
 601         us->iobuf[0] = 0;
 602         result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
 603                                  US_BULK_GET_MAX_LUN,
 604                                  USB_DIR_IN | USB_TYPE_CLASS |
 605                                  USB_RECIP_INTERFACE,
 606                                  0, us->ifnum, us->iobuf, 1, HZ);
 607
 608         /* pr_info("GetMaxLUN command result is %d, data is %d\n",
 609                                                 result, us->iobuf[0]); */
 610
 611         /* if we have a successful request, return the result */
 612         if (result > 0)
 613                 return us->iobuf[0];
 614
 615         return 0;
 616 }
 617
 618 /*
 619  * usb_stor_Bulk_transport()
 620  */
 621 int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
 622 {
 623         struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
 624         struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf;
 625         unsigned int transfer_length = scsi_bufflen(srb);
 626         unsigned int residue;
 627         int result;
 628         int fake_sense = 0;
 629         unsigned int cswlen;
 630         unsigned int cbwlen = US_BULK_CB_WRAP_LEN;
 631
 632         /* pr_info("transport --- usb_stor_Bulk_transport\n"); */
 633         /* Take care of BULK32 devices; set extra byte to 0 */
 634         if (unlikely(us->fflags & US_FL_BULK32)) {
 635                 cbwlen = 32;
 636                 us->iobuf[31] = 0;
 637         }
 638
 639         /* set up the command wrapper */
 640         bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
 641         bcb->DataTransferLength = cpu_to_le32(transfer_length);
 642         bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? 1 << 7 : 0;
 643         bcb->Tag = ++us->tag;
 644         bcb->Lun = srb->device->lun;
 645         if (us->fflags & US_FL_SCM_MULT_TARG)
 646                 bcb->Lun |= srb->device->id << 4;
 647         bcb->Length = srb->cmd_len;
 648
 649         /* copy the command payload */
 650         memset(bcb->CDB, 0, sizeof(bcb->CDB));
 651         memcpy(bcb->CDB, srb->cmnd, bcb->Length);
 652
 653         /*  send command */
 654         /* send it to out endpoint */
 655         /* pr_info("Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n",
 656                         le32_to_cpu(bcb->Signature), bcb->Tag,
 657                         le32_to_cpu(bcb->DataTransferLength), bcb->Flags,
 658                         (bcb->Lun >> 4), (bcb->Lun & 0x0F),
 659                         bcb->Length); */
 660         result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
 661                                                 bcb, cbwlen, NULL);
 662         /* pr_info("Bulk command transfer result=%d\n", result); */
 663         if (result != USB_STOR_XFER_GOOD)
 664                 return USB_STOR_TRANSPORT_ERROR;
 665
 666         if (unlikely(us->fflags & US_FL_GO_SLOW))
 667                 udelay(125);
 668
 669         /*  R/W data */
 670         if (transfer_length) {
 671                 unsigned int pipe;
 672
 673                 if (srb->sc_data_direction == DMA_FROM_DEVICE)
 674                         pipe = us->recv_bulk_pipe;
 675                 else
 676                         pipe = us->send_bulk_pipe;
 677
 678                 result = usb_stor_bulk_srb(us, pipe, srb);
 679                 /* pr_info("Bulk data transfer result 0x%x\n", result); */
 680                 if (result == USB_STOR_XFER_ERROR)
 681                         return USB_STOR_TRANSPORT_ERROR;
 682
 683                 if (result == USB_STOR_XFER_LONG)
 684                         fake_sense = 1;
 685         }
 686
 687         /* get CSW for device status */
 688         /* pr_info("Attempting to get CSW...\n"); */
 689         result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
 690                                                 US_BULK_CS_WRAP_LEN, &cswlen);
 691
 692         if (result == USB_STOR_XFER_SHORT && cswlen == 0) {
 693                 /* pr_info("Received 0-length CSW; retrying...\n"); */
 694                 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
 695                                                 US_BULK_CS_WRAP_LEN, &cswlen);
 696         }
 697
 698         /* did the attempt to read the CSW fail? */
 699         if (result == USB_STOR_XFER_STALLED) {
 700                 /* get the status again */
 701                 /* pr_info("Attempting to get CSW (2nd try)...\n"); */
 702                 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
 703                                                 US_BULK_CS_WRAP_LEN, NULL);
 704         }
 705
 706         /* if we still have a failure at this point, we're in trouble */
 707         /* pr_info("Bulk status result = %d\n", result); */
 708         if (result != USB_STOR_XFER_GOOD)
 709                 return USB_STOR_TRANSPORT_ERROR;
 710
 711         /* check bulk status */
 712         residue = le32_to_cpu(bcs->Residue);
 713         /* pr_info("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n",
 714                                 le32_to_cpu(bcs->Signature),
 715                                 bcs->Tag, residue, bcs->Status); */
 716         if (!(bcs->Tag == us->tag ||
 717                 (us->fflags & US_FL_BULK_IGNORE_TAG)) ||
 718                 bcs->Status > US_BULK_STAT_PHASE) {
 719                 /* pr_info("Bulk logical error\n"); */
 720                 return USB_STOR_TRANSPORT_ERROR;
 721         }
 722
 723         if (!us->bcs_signature) {
 724                 us->bcs_signature = bcs->Signature;
 725                 /* if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN)) */
 726                 /* pr_info("Learnt BCS signature 0x%08X\n",
 727                                 le32_to_cpu(us->bcs_signature)); */
 728         } else if (bcs->Signature != us->bcs_signature) {
 729                 /* pr_info("Signature mismatch: got %08X, expecting %08X\n",
 730                           le32_to_cpu(bcs->Signature),
 731                           le32_to_cpu(us->bcs_signature)); */
 732                 return USB_STOR_TRANSPORT_ERROR;
 733         }
 734
 735         /* try to compute the actual residue, based on how much data
 736          * was really transferred and what the device tells us */
 737         if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) {
 738
 739                 /* Heuristically detect devices that generate bogus residues
 740                  * by seeing what happens with INQUIRY and READ CAPACITY
 741                  * commands.
 742                  */
 743                 if (bcs->Status == US_BULK_STAT_OK &&
 744                                 scsi_get_resid(srb) == 0 &&
 745                                         ((srb->cmnd[0] == INQUIRY &&
 746                                                 transfer_length == 36) ||
 747                                         (srb->cmnd[0] == READ_CAPACITY &&
 748                                                 transfer_length == 8))) {
 749                         us->fflags |= US_FL_IGNORE_RESIDUE;
 750
 751                 } else {
 752                         residue = min(residue, transfer_length);
 753                         scsi_set_resid(srb, max_t(int, scsi_get_resid(srb),
 754                                                         residue));
 755                 }
 756         }
 757
 758         /* based on the status code, we report good or bad */
 759         switch (bcs->Status) {
 760         case US_BULK_STAT_OK:
 761                 if (fake_sense) {
 762                         memcpy(srb->sense_buffer, usb_stor_sense_invalidCDB,
 763                                         sizeof(usb_stor_sense_invalidCDB));
 764                         return USB_STOR_TRANSPORT_NO_SENSE;
 765                 }
 766                 return USB_STOR_TRANSPORT_GOOD;
 767
 768         case US_BULK_STAT_FAIL:
 769                 return USB_STOR_TRANSPORT_FAILED;
 770
 771         case US_BULK_STAT_PHASE:
 772                 return USB_STOR_TRANSPORT_ERROR;
 773         }
 774         return USB_STOR_TRANSPORT_ERROR;
 775 }
 776
 777 /***********************************************************************
 778  * Reset routines
 779  ***********************************************************************/
 780 /*
 781  * usb_stor_reset_common()
 782  */
 783 static int usb_stor_reset_common(struct us_data *us,
 784                 u8 request, u8 requesttype,
 785                 u16 value, u16 index, void *data, u16 size)
 786 {
 787         int result;
 788         int result2;
 789
 790         /* pr_info("transport --- usb_stor_reset_common\n"); */
 791         if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
 792                 /* pr_info("No reset during disconnect\n"); */
 793                 return -EIO;
 794         }
 795
 796         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 797                         request, requesttype, value, index, data, size, 5*HZ);
 798
 799         if (result < 0) {
 800                 /* pr_info("Soft reset failed: %d\n", result); */
 801                 return result;
 802         }
 803
 804         wait_event_interruptible_timeout(us->delay_wait,
 805                         test_bit(US_FLIDX_DISCONNECTING, &us->dflags),  HZ*6);
 806
 807         if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
 808                 /* pr_info("Reset interrupted by disconnect\n"); */
 809                 return -EIO;
 810         }
 811
 812         /* pr_info("Soft reset: clearing bulk-in endpoint halt\n"); */
 813         result = usb_stor_clear_halt(us, us->recv_bulk_pipe);
 814
 815         /* pr_info("Soft reset: clearing bulk-out endpoint halt\n"); */
 816         result2 = usb_stor_clear_halt(us, us->send_bulk_pipe);
 817
 818         /* return a result code based on the result of the clear-halts */
 819         if (result >= 0)
 820                 result = result2;
 821         /* if (result < 0) */
 822                 /* pr_info("Soft reset failed\n"); */
 823         /* else */
 824                 /* pr_info("Soft reset done\n"); */
 825         return result;
 826 }
 827
 828 /*
 829  * usb_stor_Bulk_reset()
 830  */
 831 int usb_stor_Bulk_reset(struct us_data *us)
 832 {
 833         /* pr_info("transport --- usb_stor_Bulk_reset\n"); */
 834         return usb_stor_reset_common(us, US_BULK_RESET_REQUEST,
 835                                  USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 836                                  0, us->ifnum, NULL, 0);
 837 }
 838
 839 /*
 840  * usb_stor_port_reset()
 841  */
 842 int usb_stor_port_reset(struct us_data *us)
 843 {
 844         int result;
 845
 846         /* pr_info("transport --- usb_stor_port_reset\n"); */
 847         result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf);
 848         if (result < 0)
 849                 pr_info("unable to lock device for reset: %d\n", result);
 850         else {
 851                 /* Were we disconnected while waiting for the lock? */
 852                 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
 853                         result = -EIO;
 854                         /* pr_info("No reset during disconnect\n"); */
 855                 } else {
 856                         result = usb_reset_device(us->pusb_dev);
 857                         /* pr_info("usb_reset_composite_device returns %d\n",
 858                                                                 result); */
 859                 }
 860                 usb_unlock_device(us->pusb_dev);
 861         }
 862         return result;
 863 }
 864
 865