1 /* 2 * Target driver for EMC CLARiiON AX/CX-series hardware. 3 * Based on code from Lars Marowsky-Bree <lmb@suse.de> 4 * and Ed Goggin <egoggin@emc.com>. 5 * 6 * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 7 * Copyright (C) 2006 Mike Christie 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2, or (at your option) 12 * any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; see the file COPYING. If not, write to 21 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 #include <linux/slab.h> 24 #include <scsi/scsi.h> 25 #include <scsi/scsi_eh.h> 26 #include <scsi/scsi_dh.h> 27 #include <scsi/scsi_device.h> 28 29 #define CLARIION_NAME "emc" 30 31 #define CLARIION_TRESPASS_PAGE 0x22 32 #define CLARIION_BUFFER_SIZE 0xFC 33 #define CLARIION_TIMEOUT (60 * HZ) 34 #define CLARIION_RETRIES 3 35 #define CLARIION_UNBOUND_LU -1 36 #define CLARIION_SP_A 0 37 #define CLARIION_SP_B 1 38 39 /* Flags */ 40 #define CLARIION_SHORT_TRESPASS 1 41 #define CLARIION_HONOR_RESERVATIONS 2 42 43 /* LUN states */ 44 #define CLARIION_LUN_UNINITIALIZED -1 45 #define CLARIION_LUN_UNBOUND 0 46 #define CLARIION_LUN_BOUND 1 47 #define CLARIION_LUN_OWNED 2 48 49 static unsigned char long_trespass[] = { 50 0, 0, 0, 0, 0, 0, 0, 0, 51 CLARIION_TRESPASS_PAGE, /* Page code */ 52 0x09, /* Page length - 2 */ 53 0x01, /* Trespass code */ 54 0xff, 0xff, /* Trespass target */ 55 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */ 56 }; 57 58 static unsigned char short_trespass[] = { 59 0, 0, 0, 0, 60 CLARIION_TRESPASS_PAGE, /* Page code */ 61 0x02, /* Page length - 2 */ 62 0x01, /* Trespass code */ 63 0xff, /* Trespass target */ 64 }; 65 66 static const char * lun_state[] = 67 { 68 "not bound", 69 "bound", 70 "owned", 71 }; 72 73 struct clariion_dh_data { 74 /* 75 * Flags: 76 * CLARIION_SHORT_TRESPASS 77 * Use short trespass command (FC-series) or the long version 78 * (default for AX/CX CLARiiON arrays). 79 * 80 * CLARIION_HONOR_RESERVATIONS 81 * Whether or not (default) to honor SCSI reservations when 82 * initiating a switch-over. 83 */ 84 unsigned flags; 85 /* 86 * I/O buffer for both MODE_SELECT and INQUIRY commands. 87 */ 88 unsigned char buffer[CLARIION_BUFFER_SIZE]; 89 /* 90 * SCSI sense buffer for commands -- assumes serial issuance 91 * and completion sequence of all commands for same multipath. 92 */ 93 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 94 unsigned int senselen; 95 /* 96 * LUN state 97 */ 98 int lun_state; 99 /* 100 * SP Port number 101 */ 102 int port; 103 /* 104 * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this 105 * path's mapped LUN 106 */ 107 int default_sp; 108 /* 109 * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this 110 * path's mapped LUN 111 */ 112 int current_sp; 113 }; 114 115 static inline struct clariion_dh_data 116 *get_clariion_data(struct scsi_device *sdev) 117 { 118 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; 119 BUG_ON(scsi_dh_data == NULL); 120 return ((struct clariion_dh_data *) scsi_dh_data->buf); 121 } 122 123 /* 124 * Parse MODE_SELECT cmd reply. 125 */ 126 static int trespass_endio(struct scsi_device *sdev, char *sense) 127 { 128 int err = SCSI_DH_IO; 129 struct scsi_sense_hdr sshdr; 130 131 if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) { 132 sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, " 133 "0x%2x, 0x%2x while sending CLARiiON trespass " 134 "command.\n", CLARIION_NAME, sshdr.sense_key, 135 sshdr.asc, sshdr.ascq); 136 137 if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) && 138 (sshdr.ascq == 0x00)) { 139 /* 140 * Array based copy in progress -- do not send 141 * mode_select or copy will be aborted mid-stream. 142 */ 143 sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in " 144 "progress while sending CLARiiON trespass " 145 "command.\n", CLARIION_NAME); 146 err = SCSI_DH_DEV_TEMP_BUSY; 147 } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) && 148 (sshdr.ascq == 0x03)) { 149 /* 150 * LUN Not Ready - Manual Intervention Required 151 * indicates in-progress ucode upgrade (NDU). 152 */ 153 sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress " 154 "ucode upgrade NDU operation while sending " 155 "CLARiiON trespass command.\n", CLARIION_NAME); 156 err = SCSI_DH_DEV_TEMP_BUSY; 157 } else 158 err = SCSI_DH_DEV_FAILED; 159 } else { 160 sdev_printk(KERN_INFO, sdev, 161 "%s: failed to send MODE SELECT, no sense available\n", 162 CLARIION_NAME); 163 } 164 return err; 165 } 166 167 static int parse_sp_info_reply(struct scsi_device *sdev, 168 struct clariion_dh_data *csdev) 169 { 170 int err = SCSI_DH_OK; 171 172 /* check for in-progress ucode upgrade (NDU) */ 173 if (csdev->buffer[48] != 0) { 174 sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress " 175 "ucode upgrade NDU operation while finding " 176 "current active SP.", CLARIION_NAME); 177 err = SCSI_DH_DEV_TEMP_BUSY; 178 goto out; 179 } 180 if (csdev->buffer[4] > 2) { 181 /* Invalid buffer format */ 182 sdev_printk(KERN_NOTICE, sdev, 183 "%s: invalid VPD page 0xC0 format\n", 184 CLARIION_NAME); 185 err = SCSI_DH_NOSYS; 186 goto out; 187 } 188 switch (csdev->buffer[28] & 0x0f) { 189 case 6: 190 sdev_printk(KERN_NOTICE, sdev, 191 "%s: ALUA failover mode detected\n", 192 CLARIION_NAME); 193 break; 194 case 4: 195 /* Linux failover */ 196 break; 197 default: 198 sdev_printk(KERN_WARNING, sdev, 199 "%s: Invalid failover mode %d\n", 200 CLARIION_NAME, csdev->buffer[28] & 0x0f); 201 err = SCSI_DH_NOSYS; 202 goto out; 203 } 204 205 csdev->default_sp = csdev->buffer[5]; 206 csdev->lun_state = csdev->buffer[4]; 207 csdev->current_sp = csdev->buffer[8]; 208 csdev->port = csdev->buffer[7]; 209 210 out: 211 return err; 212 } 213 214 #define emc_default_str "FC (Legacy)" 215 216 static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer) 217 { 218 unsigned char len = buffer[4] + 5; 219 char *sp_model = NULL; 220 unsigned char sp_len, serial_len; 221 222 if (len < 160) { 223 sdev_printk(KERN_WARNING, sdev, 224 "%s: Invalid information section length %d\n", 225 CLARIION_NAME, len); 226 /* Check for old FC arrays */ 227 if (!strncmp(buffer + 8, "DGC", 3)) { 228 /* Old FC array, not supporting extended information */ 229 sp_model = emc_default_str; 230 } 231 goto out; 232 } 233 234 /* 235 * Parse extended information for SP model number 236 */ 237 serial_len = buffer[160]; 238 if (serial_len == 0 || serial_len + 161 > len) { 239 sdev_printk(KERN_WARNING, sdev, 240 "%s: Invalid array serial number length %d\n", 241 CLARIION_NAME, serial_len); 242 goto out; 243 } 244 sp_len = buffer[99]; 245 if (sp_len == 0 || serial_len + sp_len + 161 > len) { 246 sdev_printk(KERN_WARNING, sdev, 247 "%s: Invalid model number length %d\n", 248 CLARIION_NAME, sp_len); 249 goto out; 250 } 251 sp_model = &buffer[serial_len + 161]; 252 /* Strip whitespace at the end */ 253 while (sp_len > 1 && sp_model[sp_len - 1] == ' ') 254 sp_len--; 255 256 sp_model[sp_len] = '\0'; 257 258 out: 259 return sp_model; 260 } 261 262 /* 263 * Get block request for REQ_BLOCK_PC command issued to path. Currently 264 * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands. 265 * 266 * Uses data and sense buffers in hardware handler context structure and 267 * assumes serial servicing of commands, both issuance and completion. 268 */ 269 static struct request *get_req(struct scsi_device *sdev, int cmd, 270 unsigned char *buffer) 271 { 272 struct request *rq; 273 int len = 0; 274 275 rq = blk_get_request(sdev->request_queue, 276 (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO); 277 if (!rq) { 278 sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed"); 279 return NULL; 280 } 281 282 rq->cmd_len = COMMAND_SIZE(cmd); 283 rq->cmd[0] = cmd; 284 285 switch (cmd) { 286 case MODE_SELECT: 287 len = sizeof(short_trespass); 288 rq->cmd[1] = 0x10; 289 rq->cmd[4] = len; 290 break; 291 case MODE_SELECT_10: 292 len = sizeof(long_trespass); 293 rq->cmd[1] = 0x10; 294 rq->cmd[8] = len; 295 break; 296 case INQUIRY: 297 len = CLARIION_BUFFER_SIZE; 298 rq->cmd[4] = len; 299 memset(buffer, 0, len); 300 break; 301 default: 302 BUG_ON(1); 303 break; 304 } 305 306 rq->cmd_type = REQ_TYPE_BLOCK_PC; 307 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | 308 REQ_FAILFAST_DRIVER; 309 rq->timeout = CLARIION_TIMEOUT; 310 rq->retries = CLARIION_RETRIES; 311 312 if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) { 313 blk_put_request(rq); 314 return NULL; 315 } 316 317 return rq; 318 } 319 320 static int send_inquiry_cmd(struct scsi_device *sdev, int page, 321 struct clariion_dh_data *csdev) 322 { 323 struct request *rq = get_req(sdev, INQUIRY, csdev->buffer); 324 int err; 325 326 if (!rq) 327 return SCSI_DH_RES_TEMP_UNAVAIL; 328 329 rq->sense = csdev->sense; 330 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 331 rq->sense_len = csdev->senselen = 0; 332 333 rq->cmd[0] = INQUIRY; 334 if (page != 0) { 335 rq->cmd[1] = 1; 336 rq->cmd[2] = page; 337 } 338 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1); 339 if (err == -EIO) { 340 sdev_printk(KERN_INFO, sdev, 341 "%s: failed to send %s INQUIRY: %x\n", 342 CLARIION_NAME, page?"EVPD":"standard", 343 rq->errors); 344 csdev->senselen = rq->sense_len; 345 err = SCSI_DH_IO; 346 } 347 348 blk_put_request(rq); 349 350 return err; 351 } 352 353 static int send_trespass_cmd(struct scsi_device *sdev, 354 struct clariion_dh_data *csdev) 355 { 356 struct request *rq; 357 unsigned char *page22; 358 int err, len, cmd; 359 360 if (csdev->flags & CLARIION_SHORT_TRESPASS) { 361 page22 = short_trespass; 362 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS)) 363 /* Set Honor Reservations bit */ 364 page22[6] |= 0x80; 365 len = sizeof(short_trespass); 366 cmd = MODE_SELECT; 367 } else { 368 page22 = long_trespass; 369 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS)) 370 /* Set Honor Reservations bit */ 371 page22[10] |= 0x80; 372 len = sizeof(long_trespass); 373 cmd = MODE_SELECT_10; 374 } 375 BUG_ON((len > CLARIION_BUFFER_SIZE)); 376 memcpy(csdev->buffer, page22, len); 377 378 rq = get_req(sdev, cmd, csdev->buffer); 379 if (!rq) 380 return SCSI_DH_RES_TEMP_UNAVAIL; 381 382 rq->sense = csdev->sense; 383 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 384 rq->sense_len = csdev->senselen = 0; 385 386 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1); 387 if (err == -EIO) { 388 if (rq->sense_len) { 389 err = trespass_endio(sdev, csdev->sense); 390 } else { 391 sdev_printk(KERN_INFO, sdev, 392 "%s: failed to send MODE SELECT: %x\n", 393 CLARIION_NAME, rq->errors); 394 } 395 } 396 397 blk_put_request(rq); 398 399 return err; 400 } 401 402 static int clariion_check_sense(struct scsi_device *sdev, 403 struct scsi_sense_hdr *sense_hdr) 404 { 405 switch (sense_hdr->sense_key) { 406 case NOT_READY: 407 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03) 408 /* 409 * LUN Not Ready - Manual Intervention Required 410 * indicates this is a passive path. 411 * 412 * FIXME: However, if this is seen and EVPD C0 413 * indicates that this is due to a NDU in 414 * progress, we should set FAIL_PATH too. 415 * This indicates we might have to do a SCSI 416 * inquiry in the end_io path. Ugh. 417 * 418 * Can return FAILED only when we want the error 419 * recovery process to kick in. 420 */ 421 return SUCCESS; 422 break; 423 case ILLEGAL_REQUEST: 424 if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01) 425 /* 426 * An array based copy is in progress. Do not 427 * fail the path, do not bypass to another PG, 428 * do not retry. Fail the IO immediately. 429 * (Actually this is the same conclusion as in 430 * the default handler, but lets make sure.) 431 * 432 * Can return FAILED only when we want the error 433 * recovery process to kick in. 434 */ 435 return SUCCESS; 436 break; 437 case UNIT_ATTENTION: 438 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) 439 /* 440 * Unit Attention Code. This is the first IO 441 * to the new path, so just retry. 442 */ 443 return ADD_TO_MLQUEUE; 444 break; 445 } 446 447 return SCSI_RETURN_NOT_HANDLED; 448 } 449 450 static int clariion_prep_fn(struct scsi_device *sdev, struct request *req) 451 { 452 struct clariion_dh_data *h = get_clariion_data(sdev); 453 int ret = BLKPREP_OK; 454 455 if (h->lun_state != CLARIION_LUN_OWNED) { 456 ret = BLKPREP_KILL; 457 req->cmd_flags |= REQ_QUIET; 458 } 459 return ret; 460 461 } 462 463 static int clariion_std_inquiry(struct scsi_device *sdev, 464 struct clariion_dh_data *csdev) 465 { 466 int err; 467 char *sp_model; 468 469 err = send_inquiry_cmd(sdev, 0, csdev); 470 if (err != SCSI_DH_OK && csdev->senselen) { 471 struct scsi_sense_hdr sshdr; 472 473 if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, 474 &sshdr)) { 475 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " 476 "%02x/%02x/%02x\n", CLARIION_NAME, 477 sshdr.sense_key, sshdr.asc, sshdr.ascq); 478 } 479 err = SCSI_DH_IO; 480 goto out; 481 } 482 483 sp_model = parse_sp_model(sdev, csdev->buffer); 484 if (!sp_model) { 485 err = SCSI_DH_DEV_UNSUPP; 486 goto out; 487 } 488 489 /* 490 * FC Series arrays do not support long trespass 491 */ 492 if (!strlen(sp_model) || !strncmp(sp_model, "FC",2)) 493 csdev->flags |= CLARIION_SHORT_TRESPASS; 494 495 sdev_printk(KERN_INFO, sdev, 496 "%s: detected Clariion %s, flags %x\n", 497 CLARIION_NAME, sp_model, csdev->flags); 498 out: 499 return err; 500 } 501 502 static int clariion_send_inquiry(struct scsi_device *sdev, 503 struct clariion_dh_data *csdev) 504 { 505 int err, retry = CLARIION_RETRIES; 506 507 retry: 508 err = send_inquiry_cmd(sdev, 0xC0, csdev); 509 if (err != SCSI_DH_OK && csdev->senselen) { 510 struct scsi_sense_hdr sshdr; 511 512 err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, 513 &sshdr); 514 if (!err) 515 return SCSI_DH_IO; 516 517 err = clariion_check_sense(sdev, &sshdr); 518 if (retry > 0 && err == ADD_TO_MLQUEUE) { 519 retry--; 520 goto retry; 521 } 522 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " 523 "%02x/%02x/%02x\n", CLARIION_NAME, 524 sshdr.sense_key, sshdr.asc, sshdr.ascq); 525 err = SCSI_DH_IO; 526 } else { 527 err = parse_sp_info_reply(sdev, csdev); 528 } 529 return err; 530 } 531 532 static int clariion_activate(struct scsi_device *sdev, 533 activate_complete fn, void *data) 534 { 535 struct clariion_dh_data *csdev = get_clariion_data(sdev); 536 int result; 537 538 result = clariion_send_inquiry(sdev, csdev); 539 if (result != SCSI_DH_OK) 540 goto done; 541 542 if (csdev->lun_state == CLARIION_LUN_OWNED) 543 goto done; 544 545 result = send_trespass_cmd(sdev, csdev); 546 if (result != SCSI_DH_OK) 547 goto done; 548 sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n", 549 CLARIION_NAME, 550 csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" ); 551 552 /* Update status */ 553 result = clariion_send_inquiry(sdev, csdev); 554 if (result != SCSI_DH_OK) 555 goto done; 556 557 done: 558 sdev_printk(KERN_INFO, sdev, 559 "%s: at SP %c Port %d (%s, default SP %c)\n", 560 CLARIION_NAME, csdev->current_sp + 'A', 561 csdev->port, lun_state[csdev->lun_state], 562 csdev->default_sp + 'A'); 563 564 if (fn) 565 fn(data, result); 566 return 0; 567 } 568 /* 569 * params - parameters in the following format 570 * "no_of_params\0param1\0param2\0param3\0...\0" 571 * for example, string for 2 parameters with value 10 and 21 572 * is specified as "2\010\021\0". 573 */ 574 static int clariion_set_params(struct scsi_device *sdev, const char *params) 575 { 576 struct clariion_dh_data *csdev = get_clariion_data(sdev); 577 unsigned int hr = 0, st = 0, argc; 578 const char *p = params; 579 int result = SCSI_DH_OK; 580 581 if ((sscanf(params, "%u", &argc) != 1) || (argc != 2)) 582 return -EINVAL; 583 584 while (*p++) 585 ; 586 if ((sscanf(p, "%u", &st) != 1) || (st > 1)) 587 return -EINVAL; 588 589 while (*p++) 590 ; 591 if ((sscanf(p, "%u", &hr) != 1) || (hr > 1)) 592 return -EINVAL; 593 594 if (st) 595 csdev->flags |= CLARIION_SHORT_TRESPASS; 596 else 597 csdev->flags &= ~CLARIION_SHORT_TRESPASS; 598 599 if (hr) 600 csdev->flags |= CLARIION_HONOR_RESERVATIONS; 601 else 602 csdev->flags &= ~CLARIION_HONOR_RESERVATIONS; 603 604 /* 605 * If this path is owned, we have to send a trespass command 606 * with the new parameters. If not, simply return. Next trespass 607 * command would use the parameters. 608 */ 609 if (csdev->lun_state != CLARIION_LUN_OWNED) 610 goto done; 611 612 csdev->lun_state = CLARIION_LUN_UNINITIALIZED; 613 result = send_trespass_cmd(sdev, csdev); 614 if (result != SCSI_DH_OK) 615 goto done; 616 617 /* Update status */ 618 result = clariion_send_inquiry(sdev, csdev); 619 620 done: 621 return result; 622 } 623 624 static const struct scsi_dh_devlist clariion_dev_list[] = { 625 {"DGC", "RAID"}, 626 {"DGC", "DISK"}, 627 {"DGC", "VRAID"}, 628 {NULL, NULL}, 629 }; 630 631 static int clariion_bus_attach(struct scsi_device *sdev); 632 static void clariion_bus_detach(struct scsi_device *sdev); 633 634 static struct scsi_device_handler clariion_dh = { 635 .name = CLARIION_NAME, 636 .module = THIS_MODULE, 637 .devlist = clariion_dev_list, 638 .attach = clariion_bus_attach, 639 .detach = clariion_bus_detach, 640 .check_sense = clariion_check_sense, 641 .activate = clariion_activate, 642 .prep_fn = clariion_prep_fn, 643 .set_params = clariion_set_params, 644 }; 645 646 static int clariion_bus_attach(struct scsi_device *sdev) 647 { 648 struct scsi_dh_data *scsi_dh_data; 649 struct clariion_dh_data *h; 650 unsigned long flags; 651 int err; 652 653 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *) 654 + sizeof(*h) , GFP_KERNEL); 655 if (!scsi_dh_data) { 656 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 657 CLARIION_NAME); 658 return -ENOMEM; 659 } 660 661 scsi_dh_data->scsi_dh = &clariion_dh; 662 h = (struct clariion_dh_data *) scsi_dh_data->buf; 663 h->lun_state = CLARIION_LUN_UNINITIALIZED; 664 h->default_sp = CLARIION_UNBOUND_LU; 665 h->current_sp = CLARIION_UNBOUND_LU; 666 667 err = clariion_std_inquiry(sdev, h); 668 if (err != SCSI_DH_OK) 669 goto failed; 670 671 err = clariion_send_inquiry(sdev, h); 672 if (err != SCSI_DH_OK) 673 goto failed; 674 675 if (!try_module_get(THIS_MODULE)) 676 goto failed; 677 678 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 679 sdev->scsi_dh_data = scsi_dh_data; 680 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 681 682 sdev_printk(KERN_INFO, sdev, 683 "%s: connected to SP %c Port %d (%s, default SP %c)\n", 684 CLARIION_NAME, h->current_sp + 'A', 685 h->port, lun_state[h->lun_state], 686 h->default_sp + 'A'); 687 688 return 0; 689 690 failed: 691 kfree(scsi_dh_data); 692 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 693 CLARIION_NAME); 694 return -EINVAL; 695 } 696 697 static void clariion_bus_detach(struct scsi_device *sdev) 698 { 699 struct scsi_dh_data *scsi_dh_data; 700 unsigned long flags; 701 702 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 703 scsi_dh_data = sdev->scsi_dh_data; 704 sdev->scsi_dh_data = NULL; 705 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 706 707 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", 708 CLARIION_NAME); 709 710 kfree(scsi_dh_data); 711 module_put(THIS_MODULE); 712 } 713 714 static int __init clariion_init(void) 715 { 716 int r; 717 718 r = scsi_register_device_handler(&clariion_dh); 719 if (r != 0) 720 printk(KERN_ERR "%s: Failed to register scsi device handler.", 721 CLARIION_NAME); 722 return r; 723 } 724 725 static void __exit clariion_exit(void) 726 { 727 scsi_unregister_device_handler(&clariion_dh); 728 } 729 730 module_init(clariion_init); 731 module_exit(clariion_exit); 732 733 MODULE_DESCRIPTION("EMC CX/AX/FC-family driver"); 734 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>"); 735 MODULE_LICENSE("GPL"); 736