1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Driver for USB Mass Storage compliant devices 4 * SCSI layer glue code 5 * 6 * Current development and maintenance by: 7 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) 8 * 9 * Developed with the assistance of: 10 * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) 11 * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov) 12 * 13 * Initial work by: 14 * (c) 1999 Michael Gee (michael@linuxspecific.com) 15 * 16 * This driver is based on the 'USB Mass Storage Class' document. This 17 * describes in detail the protocol used to communicate with such 18 * devices. Clearly, the designers had SCSI and ATAPI commands in 19 * mind when they created this document. The commands are all very 20 * similar to commands in the SCSI-II and ATAPI specifications. 21 * 22 * It is important to note that in a number of cases this class 23 * exhibits class-specific exemptions from the USB specification. 24 * Notably the usage of NAK, STALL and ACK differs from the norm, in 25 * that they are used to communicate wait, failed and OK on commands. 26 * 27 * Also, for certain devices, the interrupt endpoint is used to convey 28 * status of a command. 29 */ 30 31#include <linux/blkdev.h> 32#include <linux/dma-mapping.h> 33#include <linux/module.h> 34#include <linux/mutex.h> 35 36#include <scsi/scsi.h> 37#include <scsi/scsi_cmnd.h> 38#include <scsi/scsi_devinfo.h> 39#include <scsi/scsi_device.h> 40#include <scsi/scsi_eh.h> 41 42#include "usb.h" 43#include <linux/usb/hcd.h> 44#include "scsiglue.h" 45#include "debug.h" 46#include "transport.h" 47#include "protocol.h" 48 49/* 50 * Vendor IDs for companies that seem to include the READ CAPACITY bug 51 * in all their devices 52 */ 53#define VENDOR_ID_NOKIA 0x0421 54#define VENDOR_ID_NIKON 0x04b0 55#define VENDOR_ID_PENTAX 0x0a17 56#define VENDOR_ID_MOTOROLA 0x22b8 57 58/*********************************************************************** 59 * Host functions 60 ***********************************************************************/ 61 62static const char* host_info(struct Scsi_Host *host) 63{ 64 struct us_data *us = host_to_us(host); 65 return us->scsi_name; 66} 67 68static int slave_alloc (struct scsi_device *sdev) 69{ 70 struct us_data *us = host_to_us(sdev->host); 71 72 /* 73 * Set the INQUIRY transfer length to 36. We don't use any of 74 * the extra data and many devices choke if asked for more or 75 * less than 36 bytes. 76 */ 77 sdev->inquiry_len = 36; 78 79 /* 80 * Some host controllers may have alignment requirements. 81 * We'll play it safe by requiring 512-byte alignment always. 82 */ 83 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); 84 85 /* Tell the SCSI layer if we know there is more than one LUN */ 86 if (us->protocol == USB_PR_BULK && us->max_lun > 0) 87 sdev->sdev_bflags |= BLIST_FORCELUN; 88 89 return 0; 90} 91 92static int slave_configure(struct scsi_device *sdev) 93{ 94 struct us_data *us = host_to_us(sdev->host); 95 struct device *dev = us->pusb_dev->bus->sysdev; 96 97 /* 98 * Many devices have trouble transferring more than 32KB at a time, 99 * while others have trouble with more than 64K. At this time we 100 * are limiting both to 32K (64 sectores). 101 */ 102 if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) { 103 unsigned int max_sectors = 64; 104 105 if (us->fflags & US_FL_MAX_SECTORS_MIN) 106 max_sectors = PAGE_SIZE >> 9; 107 if (queue_max_hw_sectors(sdev->request_queue) > max_sectors) 108 blk_queue_max_hw_sectors(sdev->request_queue, 109 max_sectors); 110 } else if (sdev->type == TYPE_TAPE) { 111 /* 112 * Tapes need much higher max_sector limits, so just 113 * raise it to the maximum possible (4 GB / 512) and 114 * let the queue segment size sort out the real limit. 115 */ 116 blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF); 117 } else if (us->pusb_dev->speed >= USB_SPEED_SUPER) { 118 /* 119 * USB3 devices will be limited to 2048 sectors. This gives us 120 * better throughput on most devices. 121 */ 122 blk_queue_max_hw_sectors(sdev->request_queue, 2048); 123 } 124 125 /* 126 * The max_hw_sectors should be up to maximum size of a mapping for 127 * the device. Otherwise, a DMA API might fail on swiotlb environment. 128 */ 129 blk_queue_max_hw_sectors(sdev->request_queue, 130 min_t(size_t, queue_max_hw_sectors(sdev->request_queue), 131 dma_max_mapping_size(dev) >> SECTOR_SHIFT)); 132 133 /* 134 * Some USB host controllers can't do DMA; they have to use PIO. 135 * For such controllers we need to make sure the block layer sets 136 * up bounce buffers in addressable memory. 137 */ 138 if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) || 139 (bus_to_hcd(us->pusb_dev->bus)->localmem_pool != NULL)) 140 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH); 141 142 /* 143 * We can't put these settings in slave_alloc() because that gets 144 * called before the device type is known. Consequently these 145 * settings can't be overridden via the scsi devinfo mechanism. 146 */ 147 if (sdev->type == TYPE_DISK) { 148 149 /* 150 * Some vendors seem to put the READ CAPACITY bug into 151 * all their devices -- primarily makers of cell phones 152 * and digital cameras. Since these devices always use 153 * flash media and can be expected to have an even number 154 * of sectors, we will always enable the CAPACITY_HEURISTICS 155 * flag unless told otherwise. 156 */ 157 switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) { 158 case VENDOR_ID_NOKIA: 159 case VENDOR_ID_NIKON: 160 case VENDOR_ID_PENTAX: 161 case VENDOR_ID_MOTOROLA: 162 if (!(us->fflags & (US_FL_FIX_CAPACITY | 163 US_FL_CAPACITY_OK))) 164 us->fflags |= US_FL_CAPACITY_HEURISTICS; 165 break; 166 } 167 168 /* 169 * Disk-type devices use MODE SENSE(6) if the protocol 170 * (SubClass) is Transparent SCSI, otherwise they use 171 * MODE SENSE(10). 172 */ 173 if (us->subclass != USB_SC_SCSI && us->subclass != USB_SC_CYP_ATACB) 174 sdev->use_10_for_ms = 1; 175 176 /* 177 *Many disks only accept MODE SENSE transfer lengths of 178 * 192 bytes (that's what Windows uses). 179 */ 180 sdev->use_192_bytes_for_3f = 1; 181 182 /* 183 * Some devices don't like MODE SENSE with page=0x3f, 184 * which is the command used for checking if a device 185 * is write-protected. Now that we tell the sd driver 186 * to do a 192-byte transfer with this command the 187 * majority of devices work fine, but a few still can't 188 * handle it. The sd driver will simply assume those 189 * devices are write-enabled. 190 */ 191 if (us->fflags & US_FL_NO_WP_DETECT) 192 sdev->skip_ms_page_3f = 1; 193 194 /* 195 * A number of devices have problems with MODE SENSE for 196 * page x08, so we will skip it. 197 */ 198 sdev->skip_ms_page_8 = 1; 199 200 /* 201 * Some devices don't handle VPD pages correctly, so skip vpd 202 * pages if not forced by SCSI layer. 203 */ 204 sdev->skip_vpd_pages = !sdev->try_vpd_pages; 205 206 /* Do not attempt to use REPORT SUPPORTED OPERATION CODES */ 207 sdev->no_report_opcodes = 1; 208 209 /* Do not attempt to use WRITE SAME */ 210 sdev->no_write_same = 1; 211 212 /* 213 * Some disks return the total number of blocks in response 214 * to READ CAPACITY rather than the highest block number. 215 * If this device makes that mistake, tell the sd driver. 216 */ 217 if (us->fflags & US_FL_FIX_CAPACITY) 218 sdev->fix_capacity = 1; 219 220 /* 221 * A few disks have two indistinguishable version, one of 222 * which reports the correct capacity and the other does not. 223 * The sd driver has to guess which is the case. 224 */ 225 if (us->fflags & US_FL_CAPACITY_HEURISTICS) 226 sdev->guess_capacity = 1; 227 228 /* Some devices cannot handle READ_CAPACITY_16 */ 229 if (us->fflags & US_FL_NO_READ_CAPACITY_16) 230 sdev->no_read_capacity_16 = 1; 231 232 /* 233 * Many devices do not respond properly to READ_CAPACITY_16. 234 * Tell the SCSI layer to try READ_CAPACITY_10 first. 235 * However some USB 3.0 drive enclosures return capacity 236 * modulo 2TB. Those must use READ_CAPACITY_16 237 */ 238 if (!(us->fflags & US_FL_NEEDS_CAP16)) 239 sdev->try_rc_10_first = 1; 240 241 /* 242 * assume SPC3 or latter devices support sense size > 18 243 * unless US_FL_BAD_SENSE quirk is specified. 244 */ 245 if (sdev->scsi_level > SCSI_SPC_2 && 246 !(us->fflags & US_FL_BAD_SENSE)) 247 us->fflags |= US_FL_SANE_SENSE; 248 249 /* 250 * USB-IDE bridges tend to report SK = 0x04 (Non-recoverable 251 * Hardware Error) when any low-level error occurs, 252 * recoverable or not. Setting this flag tells the SCSI 253 * midlayer to retry such commands, which frequently will 254 * succeed and fix the error. The worst this can lead to 255 * is an occasional series of retries that will all fail. 256 */ 257 sdev->retry_hwerror = 1; 258 259 /* 260 * USB disks should allow restart. Some drives spin down 261 * automatically, requiring a START-STOP UNIT command. 262 */ 263 sdev->allow_restart = 1; 264 265 /* 266 * Some USB cardreaders have trouble reading an sdcard's last 267 * sector in a larger then 1 sector read, since the performance 268 * impact is negligible we set this flag for all USB disks 269 */ 270 sdev->last_sector_bug = 1; 271 272 /* 273 * Enable last-sector hacks for single-target devices using 274 * the Bulk-only transport, unless we already know the 275 * capacity will be decremented or is correct. 276 */ 277 if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK | 278 US_FL_SCM_MULT_TARG)) && 279 us->protocol == USB_PR_BULK) 280 us->use_last_sector_hacks = 1; 281 282 /* Check if write cache default on flag is set or not */ 283 if (us->fflags & US_FL_WRITE_CACHE) 284 sdev->wce_default_on = 1; 285 286 /* A few buggy USB-ATA bridges don't understand FUA */ 287 if (us->fflags & US_FL_BROKEN_FUA) 288 sdev->broken_fua = 1; 289 290 /* Some even totally fail to indicate a cache */ 291 if (us->fflags & US_FL_ALWAYS_SYNC) { 292 /* don't read caching information */ 293 sdev->skip_ms_page_8 = 1; 294 sdev->skip_ms_page_3f = 1; 295 /* assume sync is needed */ 296 sdev->wce_default_on = 1; 297 } 298 } else { 299 300 /* 301 * Non-disk-type devices don't need to ignore any pages 302 * or to force 192-byte transfer lengths for MODE SENSE. 303 * But they do need to use MODE SENSE(10). 304 */ 305 sdev->use_10_for_ms = 1; 306 307 /* Some (fake) usb cdrom devices don't like READ_DISC_INFO */ 308 if (us->fflags & US_FL_NO_READ_DISC_INFO) 309 sdev->no_read_disc_info = 1; 310 } 311 312 /* 313 * The CB and CBI transports have no way to pass LUN values 314 * other than the bits in the second byte of a CDB. But those 315 * bits don't get set to the LUN value if the device reports 316 * scsi_level == 0 (UNKNOWN). Hence such devices must necessarily 317 * be single-LUN. 318 */ 319 if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) && 320 sdev->scsi_level == SCSI_UNKNOWN) 321 us->max_lun = 0; 322 323 /* 324 * Some devices choke when they receive a PREVENT-ALLOW MEDIUM 325 * REMOVAL command, so suppress those commands. 326 */ 327 if (us->fflags & US_FL_NOT_LOCKABLE) 328 sdev->lockable = 0; 329 330 /* 331 * this is to satisfy the compiler, tho I don't think the 332 * return code is ever checked anywhere. 333 */ 334 return 0; 335} 336 337static int target_alloc(struct scsi_target *starget) 338{ 339 struct us_data *us = host_to_us(dev_to_shost(starget->dev.parent)); 340 341 /* 342 * Some USB drives don't support REPORT LUNS, even though they 343 * report a SCSI revision level above 2. Tell the SCSI layer 344 * not to issue that command; it will perform a normal sequential 345 * scan instead. 346 */ 347 starget->no_report_luns = 1; 348 349 /* 350 * The UFI spec treats the Peripheral Qualifier bits in an 351 * INQUIRY result as reserved and requires devices to set them 352 * to 0. However the SCSI spec requires these bits to be set 353 * to 3 to indicate when a LUN is not present. 354 * 355 * Let the scanning code know if this target merely sets 356 * Peripheral Device Type to 0x1f to indicate no LUN. 357 */ 358 if (us->subclass == USB_SC_UFI) 359 starget->pdt_1f_for_no_lun = 1; 360 361 return 0; 362} 363 364/* queue a command */ 365/* This is always called with scsi_lock(host) held */ 366static int queuecommand_lck(struct scsi_cmnd *srb, 367 void (*done)(struct scsi_cmnd *)) 368{ 369 struct us_data *us = host_to_us(srb->device->host); 370 371 /* check for state-transition errors */ 372 if (us->srb != NULL) { 373 dev_err(&us->pusb_intf->dev, 374 "Error in %s: us->srb = %p\n", __func__, us->srb); 375 return SCSI_MLQUEUE_HOST_BUSY; 376 } 377 378 /* fail the command if we are disconnecting */ 379 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { 380 usb_stor_dbg(us, "Fail command during disconnect\n"); 381 srb->result = DID_NO_CONNECT << 16; 382 done(srb); 383 return 0; 384 } 385 386 if ((us->fflags & US_FL_NO_ATA_1X) && 387 (srb->cmnd[0] == ATA_12 || srb->cmnd[0] == ATA_16)) { 388 memcpy(srb->sense_buffer, usb_stor_sense_invalidCDB, 389 sizeof(usb_stor_sense_invalidCDB)); 390 srb->result = SAM_STAT_CHECK_CONDITION; 391 done(srb); 392 return 0; 393 } 394 395 /* enqueue the command and wake up the control thread */ 396 srb->scsi_done = done; 397 us->srb = srb; 398 complete(&us->cmnd_ready); 399 400 return 0; 401} 402 403static DEF_SCSI_QCMD(queuecommand) 404 405/*********************************************************************** 406 * Error handling functions 407 ***********************************************************************/ 408 409/* Command timeout and abort */ 410static int command_abort_matching(struct us_data *us, struct scsi_cmnd *srb_match) 411{ 412 /* 413 * us->srb together with the TIMED_OUT, RESETTING, and ABORTING 414 * bits are protected by the host lock. 415 */ 416 scsi_lock(us_to_host(us)); 417 418 /* is there any active pending command to abort ? */ 419 if (!us->srb) { 420 scsi_unlock(us_to_host(us)); 421 usb_stor_dbg(us, "-- nothing to abort\n"); 422 return SUCCESS; 423 } 424 425 /* Does the command match the passed srb if any ? */ 426 if (srb_match && us->srb != srb_match) { 427 scsi_unlock(us_to_host(us)); 428 usb_stor_dbg(us, "-- pending command mismatch\n"); 429 return FAILED; 430 } 431 432 /* 433 * Set the TIMED_OUT bit. Also set the ABORTING bit, but only if 434 * a device reset isn't already in progress (to avoid interfering 435 * with the reset). Note that we must retain the host lock while 436 * calling usb_stor_stop_transport(); otherwise it might interfere 437 * with an auto-reset that begins as soon as we release the lock. 438 */ 439 set_bit(US_FLIDX_TIMED_OUT, &us->dflags); 440 if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) { 441 set_bit(US_FLIDX_ABORTING, &us->dflags); 442 usb_stor_stop_transport(us); 443 } 444 scsi_unlock(us_to_host(us)); 445 446 /* Wait for the aborted command to finish */ 447 wait_for_completion(&us->notify); 448 return SUCCESS; 449} 450 451static int command_abort(struct scsi_cmnd *srb) 452{ 453 struct us_data *us = host_to_us(srb->device->host); 454 455 usb_stor_dbg(us, "%s called\n", __func__); 456 return command_abort_matching(us, srb); 457} 458 459/* 460 * This invokes the transport reset mechanism to reset the state of the 461 * device 462 */ 463static int device_reset(struct scsi_cmnd *srb) 464{ 465 struct us_data *us = host_to_us(srb->device->host); 466 int result; 467 468 usb_stor_dbg(us, "%s called\n", __func__); 469 470 /* abort any pending command before reset */ 471 command_abort_matching(us, NULL); 472 473 /* lock the device pointers and do the reset */ 474 mutex_lock(&(us->dev_mutex)); 475 result = us->transport_reset(us); 476 mutex_unlock(&us->dev_mutex); 477 478 return result < 0 ? FAILED : SUCCESS; 479} 480 481/* Simulate a SCSI bus reset by resetting the device's USB port. */ 482static int bus_reset(struct scsi_cmnd *srb) 483{ 484 struct us_data *us = host_to_us(srb->device->host); 485 int result; 486 487 usb_stor_dbg(us, "%s called\n", __func__); 488 489 result = usb_stor_port_reset(us); 490 return result < 0 ? FAILED : SUCCESS; 491} 492 493/* 494 * Report a driver-initiated device reset to the SCSI layer. 495 * Calling this for a SCSI-initiated reset is unnecessary but harmless. 496 * The caller must own the SCSI host lock. 497 */ 498void usb_stor_report_device_reset(struct us_data *us) 499{ 500 int i; 501 struct Scsi_Host *host = us_to_host(us); 502 503 scsi_report_device_reset(host, 0, 0); 504 if (us->fflags & US_FL_SCM_MULT_TARG) { 505 for (i = 1; i < host->max_id; ++i) 506 scsi_report_device_reset(host, 0, i); 507 } 508} 509 510/* 511 * Report a driver-initiated bus reset to the SCSI layer. 512 * Calling this for a SCSI-initiated reset is unnecessary but harmless. 513 * The caller must not own the SCSI host lock. 514 */ 515void usb_stor_report_bus_reset(struct us_data *us) 516{ 517 struct Scsi_Host *host = us_to_host(us); 518 519 scsi_lock(host); 520 scsi_report_bus_reset(host, 0); 521 scsi_unlock(host); 522} 523 524/*********************************************************************** 525 * /proc/scsi/ functions 526 ***********************************************************************/ 527 528static int write_info(struct Scsi_Host *host, char *buffer, int length) 529{ 530 /* if someone is sending us data, just throw it away */ 531 return length; 532} 533 534static int show_info (struct seq_file *m, struct Scsi_Host *host) 535{ 536 struct us_data *us = host_to_us(host); 537 const char *string; 538 539 /* print the controller name */ 540 seq_printf(m, " Host scsi%d: usb-storage\n", host->host_no); 541 542 /* print product, vendor, and serial number strings */ 543 if (us->pusb_dev->manufacturer) 544 string = us->pusb_dev->manufacturer; 545 else if (us->unusual_dev->vendorName) 546 string = us->unusual_dev->vendorName; 547 else 548 string = "Unknown"; 549 seq_printf(m, " Vendor: %s\n", string); 550 if (us->pusb_dev->product) 551 string = us->pusb_dev->product; 552 else if (us->unusual_dev->productName) 553 string = us->unusual_dev->productName; 554 else 555 string = "Unknown"; 556 seq_printf(m, " Product: %s\n", string); 557 if (us->pusb_dev->serial) 558 string = us->pusb_dev->serial; 559 else 560 string = "None"; 561 seq_printf(m, "Serial Number: %s\n", string); 562 563 /* show the protocol and transport */ 564 seq_printf(m, " Protocol: %s\n", us->protocol_name); 565 seq_printf(m, " Transport: %s\n", us->transport_name); 566 567 /* show the device flags */ 568 seq_printf(m, " Quirks:"); 569 570#define US_FLAG(name, value) \ 571 if (us->fflags & value) seq_printf(m, " " #name); 572US_DO_ALL_FLAGS 573#undef US_FLAG 574 seq_putc(m, '\n'); 575 return 0; 576} 577 578/*********************************************************************** 579 * Sysfs interface 580 ***********************************************************************/ 581 582/* Output routine for the sysfs max_sectors file */ 583static ssize_t max_sectors_show(struct device *dev, struct device_attribute *attr, char *buf) 584{ 585 struct scsi_device *sdev = to_scsi_device(dev); 586 587 return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue)); 588} 589 590/* Input routine for the sysfs max_sectors file */ 591static ssize_t max_sectors_store(struct device *dev, struct device_attribute *attr, const char *buf, 592 size_t count) 593{ 594 struct scsi_device *sdev = to_scsi_device(dev); 595 unsigned short ms; 596 597 if (sscanf(buf, "%hu", &ms) > 0) { 598 blk_queue_max_hw_sectors(sdev->request_queue, ms); 599 return count; 600 } 601 return -EINVAL; 602} 603static DEVICE_ATTR_RW(max_sectors); 604 605static struct device_attribute *sysfs_device_attr_list[] = { 606 &dev_attr_max_sectors, 607 NULL, 608}; 609 610/* 611 * this defines our host template, with which we'll allocate hosts 612 */ 613 614static const struct scsi_host_template usb_stor_host_template = { 615 /* basic userland interface stuff */ 616 .name = "usb-storage", 617 .proc_name = "usb-storage", 618 .show_info = show_info, 619 .write_info = write_info, 620 .info = host_info, 621 622 /* command interface -- queued only */ 623 .queuecommand = queuecommand, 624 625 /* error and abort handlers */ 626 .eh_abort_handler = command_abort, 627 .eh_device_reset_handler = device_reset, 628 .eh_bus_reset_handler = bus_reset, 629 630 /* queue commands only, only one command per LUN */ 631 .can_queue = 1, 632 633 /* unknown initiator id */ 634 .this_id = -1, 635 636 .slave_alloc = slave_alloc, 637 .slave_configure = slave_configure, 638 .target_alloc = target_alloc, 639 640 /* lots of sg segments can be handled */ 641 .sg_tablesize = SG_MAX_SEGMENTS, 642 643 644 /* 645 * Limit the total size of a transfer to 120 KB. 646 * 647 * Some devices are known to choke with anything larger. It seems like 648 * the problem stems from the fact that original IDE controllers had 649 * only an 8-bit register to hold the number of sectors in one transfer 650 * and even those couldn't handle a full 256 sectors. 651 * 652 * Because we want to make sure we interoperate with as many devices as 653 * possible, we will maintain a 240 sector transfer size limit for USB 654 * Mass Storage devices. 655 * 656 * Tests show that other operating have similar limits with Microsoft 657 * Windows 7 limiting transfers to 128 sectors for both USB2 and USB3 658 * and Apple Mac OS X 10.11 limiting transfers to 256 sectors for USB2 659 * and 2048 for USB3 devices. 660 */ 661 .max_sectors = 240, 662 663 /* emulated HBA */ 664 .emulated = 1, 665 666 /* we do our own delay after a device or bus reset */ 667 .skip_settle_delay = 1, 668 669 /* sysfs device attributes */ 670 .sdev_attrs = sysfs_device_attr_list, 671 672 /* module management */ 673 .module = THIS_MODULE 674}; 675 676void usb_stor_host_template_init(struct scsi_host_template *sht, 677 const char *name, struct module *owner) 678{ 679 *sht = usb_stor_host_template; 680 sht->name = name; 681 sht->proc_name = name; 682 sht->module = owner; 683} 684EXPORT_SYMBOL_GPL(usb_stor_host_template_init); 685 686/* To Report "Illegal Request: Invalid Field in CDB */ 687unsigned char usb_stor_sense_invalidCDB[18] = { 688 [0] = 0x70, /* current error */ 689 [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */ 690 [7] = 0x0a, /* additional length */ 691 [12] = 0x24 /* Invalid Field in CDB */ 692}; 693EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB); 694