1 /* 2 * Engenio/LSI RDAC SCSI Device Handler 3 * 4 * Copyright (C) 2005 Mike Christie. All rights reserved. 5 * Copyright (C) Chandra Seetharaman, IBM Corp. 2007 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 20 * 21 */ 22 #include <scsi/scsi.h> 23 #include <scsi/scsi_eh.h> 24 #include <scsi/scsi_dh.h> 25 26 #define RDAC_NAME "rdac" 27 #define RDAC_RETRY_COUNT 5 28 29 /* 30 * LSI mode page stuff 31 * 32 * These struct definitions and the forming of the 33 * mode page were taken from the LSI RDAC 2.4 GPL'd 34 * driver, and then converted to Linux conventions. 35 */ 36 #define RDAC_QUIESCENCE_TIME 20; 37 /* 38 * Page Codes 39 */ 40 #define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c 41 42 /* 43 * Controller modes definitions 44 */ 45 #define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02 46 47 /* 48 * RDAC Options field 49 */ 50 #define RDAC_FORCED_QUIESENCE 0x02 51 52 #define RDAC_TIMEOUT (60 * HZ) 53 #define RDAC_RETRIES 3 54 55 struct rdac_mode_6_hdr { 56 u8 data_len; 57 u8 medium_type; 58 u8 device_params; 59 u8 block_desc_len; 60 }; 61 62 struct rdac_mode_10_hdr { 63 u16 data_len; 64 u8 medium_type; 65 u8 device_params; 66 u16 reserved; 67 u16 block_desc_len; 68 }; 69 70 struct rdac_mode_common { 71 u8 controller_serial[16]; 72 u8 alt_controller_serial[16]; 73 u8 rdac_mode[2]; 74 u8 alt_rdac_mode[2]; 75 u8 quiescence_timeout; 76 u8 rdac_options; 77 }; 78 79 struct rdac_pg_legacy { 80 struct rdac_mode_6_hdr hdr; 81 u8 page_code; 82 u8 page_len; 83 struct rdac_mode_common common; 84 #define MODE6_MAX_LUN 32 85 u8 lun_table[MODE6_MAX_LUN]; 86 u8 reserved2[32]; 87 u8 reserved3; 88 u8 reserved4; 89 }; 90 91 struct rdac_pg_expanded { 92 struct rdac_mode_10_hdr hdr; 93 u8 page_code; 94 u8 subpage_code; 95 u8 page_len[2]; 96 struct rdac_mode_common common; 97 u8 lun_table[256]; 98 u8 reserved3; 99 u8 reserved4; 100 }; 101 102 struct c9_inquiry { 103 u8 peripheral_info; 104 u8 page_code; /* 0xC9 */ 105 u8 reserved1; 106 u8 page_len; 107 u8 page_id[4]; /* "vace" */ 108 u8 avte_cvp; 109 u8 path_prio; 110 u8 reserved2[38]; 111 }; 112 113 #define SUBSYS_ID_LEN 16 114 #define SLOT_ID_LEN 2 115 116 struct c4_inquiry { 117 u8 peripheral_info; 118 u8 page_code; /* 0xC4 */ 119 u8 reserved1; 120 u8 page_len; 121 u8 page_id[4]; /* "subs" */ 122 u8 subsys_id[SUBSYS_ID_LEN]; 123 u8 revision[4]; 124 u8 slot_id[SLOT_ID_LEN]; 125 u8 reserved[2]; 126 }; 127 128 struct rdac_controller { 129 u8 subsys_id[SUBSYS_ID_LEN]; 130 u8 slot_id[SLOT_ID_LEN]; 131 int use_ms10; 132 struct kref kref; 133 struct list_head node; /* list of all controllers */ 134 union { 135 struct rdac_pg_legacy legacy; 136 struct rdac_pg_expanded expanded; 137 } mode_select; 138 }; 139 struct c8_inquiry { 140 u8 peripheral_info; 141 u8 page_code; /* 0xC8 */ 142 u8 reserved1; 143 u8 page_len; 144 u8 page_id[4]; /* "edid" */ 145 u8 reserved2[3]; 146 u8 vol_uniq_id_len; 147 u8 vol_uniq_id[16]; 148 u8 vol_user_label_len; 149 u8 vol_user_label[60]; 150 u8 array_uniq_id_len; 151 u8 array_unique_id[16]; 152 u8 array_user_label_len; 153 u8 array_user_label[60]; 154 u8 lun[8]; 155 }; 156 157 struct c2_inquiry { 158 u8 peripheral_info; 159 u8 page_code; /* 0xC2 */ 160 u8 reserved1; 161 u8 page_len; 162 u8 page_id[4]; /* "swr4" */ 163 u8 sw_version[3]; 164 u8 sw_date[3]; 165 u8 features_enabled; 166 u8 max_lun_supported; 167 u8 partitions[239]; /* Total allocation length should be 0xFF */ 168 }; 169 170 struct rdac_dh_data { 171 struct rdac_controller *ctlr; 172 #define UNINITIALIZED_LUN (1 << 8) 173 unsigned lun; 174 #define RDAC_STATE_ACTIVE 0 175 #define RDAC_STATE_PASSIVE 1 176 unsigned char state; 177 178 #define RDAC_LUN_UNOWNED 0 179 #define RDAC_LUN_OWNED 1 180 #define RDAC_LUN_AVT 2 181 char lun_state; 182 unsigned char sense[SCSI_SENSE_BUFFERSIZE]; 183 union { 184 struct c2_inquiry c2; 185 struct c4_inquiry c4; 186 struct c8_inquiry c8; 187 struct c9_inquiry c9; 188 } inq; 189 }; 190 191 static const char *lun_state[] = 192 { 193 "unowned", 194 "owned", 195 "owned (AVT mode)", 196 }; 197 198 static LIST_HEAD(ctlr_list); 199 static DEFINE_SPINLOCK(list_lock); 200 201 static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev) 202 { 203 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; 204 BUG_ON(scsi_dh_data == NULL); 205 return ((struct rdac_dh_data *) scsi_dh_data->buf); 206 } 207 208 static struct request *get_rdac_req(struct scsi_device *sdev, 209 void *buffer, unsigned buflen, int rw) 210 { 211 struct request *rq; 212 struct request_queue *q = sdev->request_queue; 213 214 rq = blk_get_request(q, rw, GFP_NOIO); 215 216 if (!rq) { 217 sdev_printk(KERN_INFO, sdev, 218 "get_rdac_req: blk_get_request failed.\n"); 219 return NULL; 220 } 221 222 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) { 223 blk_put_request(rq); 224 sdev_printk(KERN_INFO, sdev, 225 "get_rdac_req: blk_rq_map_kern failed.\n"); 226 return NULL; 227 } 228 229 rq->cmd_type = REQ_TYPE_BLOCK_PC; 230 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | 231 REQ_FAILFAST_DRIVER; 232 rq->retries = RDAC_RETRIES; 233 rq->timeout = RDAC_TIMEOUT; 234 235 return rq; 236 } 237 238 static struct request *rdac_failover_get(struct scsi_device *sdev, 239 struct rdac_dh_data *h) 240 { 241 struct request *rq; 242 struct rdac_mode_common *common; 243 unsigned data_size; 244 245 if (h->ctlr->use_ms10) { 246 struct rdac_pg_expanded *rdac_pg; 247 248 data_size = sizeof(struct rdac_pg_expanded); 249 rdac_pg = &h->ctlr->mode_select.expanded; 250 memset(rdac_pg, 0, data_size); 251 common = &rdac_pg->common; 252 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40; 253 rdac_pg->subpage_code = 0x1; 254 rdac_pg->page_len[0] = 0x01; 255 rdac_pg->page_len[1] = 0x28; 256 rdac_pg->lun_table[h->lun] = 0x81; 257 } else { 258 struct rdac_pg_legacy *rdac_pg; 259 260 data_size = sizeof(struct rdac_pg_legacy); 261 rdac_pg = &h->ctlr->mode_select.legacy; 262 memset(rdac_pg, 0, data_size); 263 common = &rdac_pg->common; 264 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER; 265 rdac_pg->page_len = 0x68; 266 rdac_pg->lun_table[h->lun] = 0x81; 267 } 268 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS; 269 common->quiescence_timeout = RDAC_QUIESCENCE_TIME; 270 common->rdac_options = RDAC_FORCED_QUIESENCE; 271 272 /* get request for block layer packet command */ 273 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE); 274 if (!rq) 275 return NULL; 276 277 /* Prepare the command. */ 278 if (h->ctlr->use_ms10) { 279 rq->cmd[0] = MODE_SELECT_10; 280 rq->cmd[7] = data_size >> 8; 281 rq->cmd[8] = data_size & 0xff; 282 } else { 283 rq->cmd[0] = MODE_SELECT; 284 rq->cmd[4] = data_size; 285 } 286 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); 287 288 rq->sense = h->sense; 289 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 290 rq->sense_len = 0; 291 292 return rq; 293 } 294 295 static void release_controller(struct kref *kref) 296 { 297 struct rdac_controller *ctlr; 298 ctlr = container_of(kref, struct rdac_controller, kref); 299 300 spin_lock(&list_lock); 301 list_del(&ctlr->node); 302 spin_unlock(&list_lock); 303 kfree(ctlr); 304 } 305 306 static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id) 307 { 308 struct rdac_controller *ctlr, *tmp; 309 310 spin_lock(&list_lock); 311 312 list_for_each_entry(tmp, &ctlr_list, node) { 313 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) && 314 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) { 315 kref_get(&tmp->kref); 316 spin_unlock(&list_lock); 317 return tmp; 318 } 319 } 320 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC); 321 if (!ctlr) 322 goto done; 323 324 /* initialize fields of controller */ 325 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN); 326 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN); 327 kref_init(&ctlr->kref); 328 ctlr->use_ms10 = -1; 329 list_add(&ctlr->node, &ctlr_list); 330 done: 331 spin_unlock(&list_lock); 332 return ctlr; 333 } 334 335 static int submit_inquiry(struct scsi_device *sdev, int page_code, 336 unsigned int len, struct rdac_dh_data *h) 337 { 338 struct request *rq; 339 struct request_queue *q = sdev->request_queue; 340 int err = SCSI_DH_RES_TEMP_UNAVAIL; 341 342 rq = get_rdac_req(sdev, &h->inq, len, READ); 343 if (!rq) 344 goto done; 345 346 /* Prepare the command. */ 347 rq->cmd[0] = INQUIRY; 348 rq->cmd[1] = 1; 349 rq->cmd[2] = page_code; 350 rq->cmd[4] = len; 351 rq->cmd_len = COMMAND_SIZE(INQUIRY); 352 353 rq->sense = h->sense; 354 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); 355 rq->sense_len = 0; 356 357 err = blk_execute_rq(q, NULL, rq, 1); 358 if (err == -EIO) 359 err = SCSI_DH_IO; 360 361 blk_put_request(rq); 362 done: 363 return err; 364 } 365 366 static int get_lun(struct scsi_device *sdev, struct rdac_dh_data *h) 367 { 368 int err; 369 struct c8_inquiry *inqp; 370 371 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h); 372 if (err == SCSI_DH_OK) { 373 inqp = &h->inq.c8; 374 if (inqp->page_code != 0xc8) 375 return SCSI_DH_NOSYS; 376 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' || 377 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd') 378 return SCSI_DH_NOSYS; 379 h->lun = inqp->lun[7]; /* Uses only the last byte */ 380 } 381 return err; 382 } 383 384 static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h) 385 { 386 int err; 387 struct c9_inquiry *inqp; 388 389 h->lun_state = RDAC_LUN_UNOWNED; 390 h->state = RDAC_STATE_ACTIVE; 391 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h); 392 if (err == SCSI_DH_OK) { 393 inqp = &h->inq.c9; 394 if ((inqp->avte_cvp >> 7) == 0x1) { 395 /* LUN in AVT mode */ 396 sdev_printk(KERN_NOTICE, sdev, 397 "%s: AVT mode detected\n", 398 RDAC_NAME); 399 h->lun_state = RDAC_LUN_AVT; 400 } else if ((inqp->avte_cvp & 0x1) != 0) { 401 /* LUN was owned by the controller */ 402 h->lun_state = RDAC_LUN_OWNED; 403 } 404 } 405 406 if (h->lun_state == RDAC_LUN_UNOWNED) 407 h->state = RDAC_STATE_PASSIVE; 408 409 return err; 410 } 411 412 static int initialize_controller(struct scsi_device *sdev, 413 struct rdac_dh_data *h) 414 { 415 int err; 416 struct c4_inquiry *inqp; 417 418 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h); 419 if (err == SCSI_DH_OK) { 420 inqp = &h->inq.c4; 421 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id); 422 if (!h->ctlr) 423 err = SCSI_DH_RES_TEMP_UNAVAIL; 424 } 425 return err; 426 } 427 428 static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 429 { 430 int err; 431 struct c2_inquiry *inqp; 432 433 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h); 434 if (err == SCSI_DH_OK) { 435 inqp = &h->inq.c2; 436 /* 437 * If more than MODE6_MAX_LUN luns are supported, use 438 * mode select 10 439 */ 440 if (inqp->max_lun_supported >= MODE6_MAX_LUN) 441 h->ctlr->use_ms10 = 1; 442 else 443 h->ctlr->use_ms10 = 0; 444 } 445 return err; 446 } 447 448 static int mode_select_handle_sense(struct scsi_device *sdev, 449 unsigned char *sensebuf) 450 { 451 struct scsi_sense_hdr sense_hdr; 452 int err = SCSI_DH_IO, ret; 453 454 ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr); 455 if (!ret) 456 goto done; 457 458 err = SCSI_DH_OK; 459 460 switch (sense_hdr.sense_key) { 461 case NO_SENSE: 462 case ABORTED_COMMAND: 463 case UNIT_ATTENTION: 464 err = SCSI_DH_RETRY; 465 break; 466 case NOT_READY: 467 if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01) 468 /* LUN Not Ready and is in the Process of Becoming 469 * Ready 470 */ 471 err = SCSI_DH_RETRY; 472 break; 473 case ILLEGAL_REQUEST: 474 if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36) 475 /* 476 * Command Lock contention 477 */ 478 err = SCSI_DH_RETRY; 479 break; 480 default: 481 sdev_printk(KERN_INFO, sdev, 482 "MODE_SELECT failed with sense %02x/%02x/%02x.\n", 483 sense_hdr.sense_key, sense_hdr.asc, sense_hdr.ascq); 484 } 485 486 done: 487 return err; 488 } 489 490 static int send_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) 491 { 492 struct request *rq; 493 struct request_queue *q = sdev->request_queue; 494 int err, retry_cnt = RDAC_RETRY_COUNT; 495 496 retry: 497 err = SCSI_DH_RES_TEMP_UNAVAIL; 498 rq = rdac_failover_get(sdev, h); 499 if (!rq) 500 goto done; 501 502 sdev_printk(KERN_INFO, sdev, "%s MODE_SELECT command.\n", 503 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); 504 505 err = blk_execute_rq(q, NULL, rq, 1); 506 blk_put_request(rq); 507 if (err != SCSI_DH_OK) { 508 err = mode_select_handle_sense(sdev, h->sense); 509 if (err == SCSI_DH_RETRY && retry_cnt--) 510 goto retry; 511 } 512 if (err == SCSI_DH_OK) 513 h->state = RDAC_STATE_ACTIVE; 514 515 done: 516 return err; 517 } 518 519 static int rdac_activate(struct scsi_device *sdev) 520 { 521 struct rdac_dh_data *h = get_rdac_data(sdev); 522 int err = SCSI_DH_OK; 523 524 err = check_ownership(sdev, h); 525 if (err != SCSI_DH_OK) 526 goto done; 527 528 if (!h->ctlr) { 529 err = initialize_controller(sdev, h); 530 if (err != SCSI_DH_OK) 531 goto done; 532 } 533 534 if (h->ctlr->use_ms10 == -1) { 535 err = set_mode_select(sdev, h); 536 if (err != SCSI_DH_OK) 537 goto done; 538 } 539 if (h->lun_state == RDAC_LUN_UNOWNED) 540 err = send_mode_select(sdev, h); 541 done: 542 return err; 543 } 544 545 static int rdac_prep_fn(struct scsi_device *sdev, struct request *req) 546 { 547 struct rdac_dh_data *h = get_rdac_data(sdev); 548 int ret = BLKPREP_OK; 549 550 if (h->state != RDAC_STATE_ACTIVE) { 551 ret = BLKPREP_KILL; 552 req->cmd_flags |= REQ_QUIET; 553 } 554 return ret; 555 556 } 557 558 static int rdac_check_sense(struct scsi_device *sdev, 559 struct scsi_sense_hdr *sense_hdr) 560 { 561 struct rdac_dh_data *h = get_rdac_data(sdev); 562 switch (sense_hdr->sense_key) { 563 case NOT_READY: 564 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81) 565 /* LUN Not Ready - Storage firmware incompatible 566 * Manual code synchonisation required. 567 * 568 * Nothing we can do here. Try to bypass the path. 569 */ 570 return SUCCESS; 571 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1) 572 /* LUN Not Ready - Quiescense in progress 573 * 574 * Just retry and wait. 575 */ 576 return ADD_TO_MLQUEUE; 577 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02) 578 /* LUN Not Ready - Quiescense in progress 579 * or has been achieved 580 * Just retry. 581 */ 582 return ADD_TO_MLQUEUE; 583 break; 584 case ILLEGAL_REQUEST: 585 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) { 586 /* Invalid Request - Current Logical Unit Ownership. 587 * Controller is not the current owner of the LUN, 588 * Fail the path, so that the other path be used. 589 */ 590 h->state = RDAC_STATE_PASSIVE; 591 return SUCCESS; 592 } 593 break; 594 case UNIT_ATTENTION: 595 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) 596 /* 597 * Power On, Reset, or Bus Device Reset, just retry. 598 */ 599 return ADD_TO_MLQUEUE; 600 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02) 601 /* 602 * Quiescence in progress , just retry. 603 */ 604 return ADD_TO_MLQUEUE; 605 break; 606 } 607 /* success just means we do not care what scsi-ml does */ 608 return SCSI_RETURN_NOT_HANDLED; 609 } 610 611 static const struct scsi_dh_devlist rdac_dev_list[] = { 612 {"IBM", "1722"}, 613 {"IBM", "1724"}, 614 {"IBM", "1726"}, 615 {"IBM", "1742"}, 616 {"IBM", "1814"}, 617 {"IBM", "1815"}, 618 {"IBM", "1818"}, 619 {"IBM", "3526"}, 620 {"SGI", "TP9400"}, 621 {"SGI", "TP9500"}, 622 {"SGI", "IS"}, 623 {"STK", "OPENstorage D280"}, 624 {"SUN", "CSM200_R"}, 625 {"SUN", "LCSM100_F"}, 626 {"DELL", "MD3000"}, 627 {"DELL", "MD3000i"}, 628 {"LSI", "INF-01-00"}, 629 {"ENGENIO", "INF-01-00"}, 630 {NULL, NULL}, 631 }; 632 633 static int rdac_bus_attach(struct scsi_device *sdev); 634 static void rdac_bus_detach(struct scsi_device *sdev); 635 636 static struct scsi_device_handler rdac_dh = { 637 .name = RDAC_NAME, 638 .module = THIS_MODULE, 639 .devlist = rdac_dev_list, 640 .prep_fn = rdac_prep_fn, 641 .check_sense = rdac_check_sense, 642 .attach = rdac_bus_attach, 643 .detach = rdac_bus_detach, 644 .activate = rdac_activate, 645 }; 646 647 static int rdac_bus_attach(struct scsi_device *sdev) 648 { 649 struct scsi_dh_data *scsi_dh_data; 650 struct rdac_dh_data *h; 651 unsigned long flags; 652 int err; 653 654 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *) 655 + sizeof(*h) , GFP_KERNEL); 656 if (!scsi_dh_data) { 657 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 658 RDAC_NAME); 659 return 0; 660 } 661 662 scsi_dh_data->scsi_dh = &rdac_dh; 663 h = (struct rdac_dh_data *) scsi_dh_data->buf; 664 h->lun = UNINITIALIZED_LUN; 665 h->state = RDAC_STATE_ACTIVE; 666 667 err = get_lun(sdev, h); 668 if (err != SCSI_DH_OK) 669 goto failed; 670 671 err = check_ownership(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_NOTICE, sdev, 683 "%s: LUN %d (%s)\n", 684 RDAC_NAME, h->lun, lun_state[(int)h->lun_state]); 685 686 return 0; 687 688 failed: 689 kfree(scsi_dh_data); 690 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 691 RDAC_NAME); 692 return -EINVAL; 693 } 694 695 static void rdac_bus_detach( struct scsi_device *sdev ) 696 { 697 struct scsi_dh_data *scsi_dh_data; 698 struct rdac_dh_data *h; 699 unsigned long flags; 700 701 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 702 scsi_dh_data = sdev->scsi_dh_data; 703 sdev->scsi_dh_data = NULL; 704 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 705 706 h = (struct rdac_dh_data *) scsi_dh_data->buf; 707 if (h->ctlr) 708 kref_put(&h->ctlr->kref, release_controller); 709 kfree(scsi_dh_data); 710 module_put(THIS_MODULE); 711 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", RDAC_NAME); 712 } 713 714 715 716 static int __init rdac_init(void) 717 { 718 int r; 719 720 r = scsi_register_device_handler(&rdac_dh); 721 if (r != 0) 722 printk(KERN_ERR "Failed to register scsi device handler."); 723 return r; 724 } 725 726 static void __exit rdac_exit(void) 727 { 728 scsi_unregister_device_handler(&rdac_dh); 729 } 730 731 module_init(rdac_init); 732 module_exit(rdac_exit); 733 734 MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver"); 735 MODULE_AUTHOR("Mike Christie, Chandra Seetharaman"); 736 MODULE_LICENSE("GPL"); 737