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 49static 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 58static 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 66static const char * lun_state[] = 67{ 68 "not bound", 69 "bound", 70 "owned", 71}; 72 73struct 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 115static 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 */ 126static 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 167static 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 210out: 211 return err; 212} 213 214#define emc_default_str "FC (Legacy)" 215 216static 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 258out: 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 */ 269static 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 320static 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 353static 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 402static 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 return SUCCESS; 409 break; 410 case ILLEGAL_REQUEST: 411 if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01) 412 /* 413 * An array based copy is in progress. Do not 414 * fail the path, do not bypass to another PG, 415 * do not retry. Fail the IO immediately. 416 * (Actually this is the same conclusion as in 417 * the default handler, but lets make sure.) 418 * 419 * Can return FAILED only when we want the error 420 * recovery process to kick in. 421 */ 422 return SUCCESS; 423 break; 424 case UNIT_ATTENTION: 425 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) 426 /* 427 * Unit Attention Code. This is the first IO 428 * to the new path, so just retry. 429 */ 430 return ADD_TO_MLQUEUE; 431 break; 432 } 433 434 return SCSI_RETURN_NOT_HANDLED; 435} 436 437static int clariion_prep_fn(struct scsi_device *sdev, struct request *req) 438{ 439 struct clariion_dh_data *h = get_clariion_data(sdev); 440 int ret = BLKPREP_OK; 441 442 if (h->lun_state != CLARIION_LUN_OWNED) { 443 ret = BLKPREP_KILL; 444 req->cmd_flags |= REQ_QUIET; 445 } 446 return ret; 447 448} 449 450static int clariion_std_inquiry(struct scsi_device *sdev, 451 struct clariion_dh_data *csdev) 452{ 453 int err; 454 char *sp_model; 455 456 err = send_inquiry_cmd(sdev, 0, csdev); 457 if (err != SCSI_DH_OK && csdev->senselen) { 458 struct scsi_sense_hdr sshdr; 459 460 if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, 461 &sshdr)) { 462 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " 463 "%02x/%02x/%02x\n", CLARIION_NAME, 464 sshdr.sense_key, sshdr.asc, sshdr.ascq); 465 } 466 err = SCSI_DH_IO; 467 goto out; 468 } 469 470 sp_model = parse_sp_model(sdev, csdev->buffer); 471 if (!sp_model) { 472 err = SCSI_DH_DEV_UNSUPP; 473 goto out; 474 } 475 476 /* 477 * FC Series arrays do not support long trespass 478 */ 479 if (!strlen(sp_model) || !strncmp(sp_model, "FC",2)) 480 csdev->flags |= CLARIION_SHORT_TRESPASS; 481 482 sdev_printk(KERN_INFO, sdev, 483 "%s: detected Clariion %s, flags %x\n", 484 CLARIION_NAME, sp_model, csdev->flags); 485out: 486 return err; 487} 488 489static int clariion_send_inquiry(struct scsi_device *sdev, 490 struct clariion_dh_data *csdev) 491{ 492 int err, retry = CLARIION_RETRIES; 493 494retry: 495 err = send_inquiry_cmd(sdev, 0xC0, csdev); 496 if (err != SCSI_DH_OK && csdev->senselen) { 497 struct scsi_sense_hdr sshdr; 498 499 err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, 500 &sshdr); 501 if (!err) 502 return SCSI_DH_IO; 503 504 err = clariion_check_sense(sdev, &sshdr); 505 if (retry > 0 && err == ADD_TO_MLQUEUE) { 506 retry--; 507 goto retry; 508 } 509 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " 510 "%02x/%02x/%02x\n", CLARIION_NAME, 511 sshdr.sense_key, sshdr.asc, sshdr.ascq); 512 err = SCSI_DH_IO; 513 } else { 514 err = parse_sp_info_reply(sdev, csdev); 515 } 516 return err; 517} 518 519static int clariion_activate(struct scsi_device *sdev, 520 activate_complete fn, void *data) 521{ 522 struct clariion_dh_data *csdev = get_clariion_data(sdev); 523 int result; 524 525 result = clariion_send_inquiry(sdev, csdev); 526 if (result != SCSI_DH_OK) 527 goto done; 528 529 if (csdev->lun_state == CLARIION_LUN_OWNED) 530 goto done; 531 532 result = send_trespass_cmd(sdev, csdev); 533 if (result != SCSI_DH_OK) 534 goto done; 535 sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n", 536 CLARIION_NAME, 537 csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" ); 538 539 /* Update status */ 540 result = clariion_send_inquiry(sdev, csdev); 541 if (result != SCSI_DH_OK) 542 goto done; 543 544done: 545 sdev_printk(KERN_INFO, sdev, 546 "%s: at SP %c Port %d (%s, default SP %c)\n", 547 CLARIION_NAME, csdev->current_sp + 'A', 548 csdev->port, lun_state[csdev->lun_state], 549 csdev->default_sp + 'A'); 550 551 if (fn) 552 fn(data, result); 553 return 0; 554} 555/* 556 * params - parameters in the following format 557 * "no_of_params\0param1\0param2\0param3\0...\0" 558 * for example, string for 2 parameters with value 10 and 21 559 * is specified as "2\010\021\0". 560 */ 561static int clariion_set_params(struct scsi_device *sdev, const char *params) 562{ 563 struct clariion_dh_data *csdev = get_clariion_data(sdev); 564 unsigned int hr = 0, st = 0, argc; 565 const char *p = params; 566 int result = SCSI_DH_OK; 567 568 if ((sscanf(params, "%u", &argc) != 1) || (argc != 2)) 569 return -EINVAL; 570 571 while (*p++) 572 ; 573 if ((sscanf(p, "%u", &st) != 1) || (st > 1)) 574 return -EINVAL; 575 576 while (*p++) 577 ; 578 if ((sscanf(p, "%u", &hr) != 1) || (hr > 1)) 579 return -EINVAL; 580 581 if (st) 582 csdev->flags |= CLARIION_SHORT_TRESPASS; 583 else 584 csdev->flags &= ~CLARIION_SHORT_TRESPASS; 585 586 if (hr) 587 csdev->flags |= CLARIION_HONOR_RESERVATIONS; 588 else 589 csdev->flags &= ~CLARIION_HONOR_RESERVATIONS; 590 591 /* 592 * If this path is owned, we have to send a trespass command 593 * with the new parameters. If not, simply return. Next trespass 594 * command would use the parameters. 595 */ 596 if (csdev->lun_state != CLARIION_LUN_OWNED) 597 goto done; 598 599 csdev->lun_state = CLARIION_LUN_UNINITIALIZED; 600 result = send_trespass_cmd(sdev, csdev); 601 if (result != SCSI_DH_OK) 602 goto done; 603 604 /* Update status */ 605 result = clariion_send_inquiry(sdev, csdev); 606 607done: 608 return result; 609} 610 611static const struct scsi_dh_devlist clariion_dev_list[] = { 612 {"DGC", "RAID"}, 613 {"DGC", "DISK"}, 614 {"DGC", "VRAID"}, 615 {NULL, NULL}, 616}; 617 618static int clariion_bus_attach(struct scsi_device *sdev); 619static void clariion_bus_detach(struct scsi_device *sdev); 620 621static struct scsi_device_handler clariion_dh = { 622 .name = CLARIION_NAME, 623 .module = THIS_MODULE, 624 .devlist = clariion_dev_list, 625 .attach = clariion_bus_attach, 626 .detach = clariion_bus_detach, 627 .check_sense = clariion_check_sense, 628 .activate = clariion_activate, 629 .prep_fn = clariion_prep_fn, 630 .set_params = clariion_set_params, 631}; 632 633static int clariion_bus_attach(struct scsi_device *sdev) 634{ 635 struct scsi_dh_data *scsi_dh_data; 636 struct clariion_dh_data *h; 637 unsigned long flags; 638 int err; 639 640 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *) 641 + sizeof(*h) , GFP_KERNEL); 642 if (!scsi_dh_data) { 643 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", 644 CLARIION_NAME); 645 return -ENOMEM; 646 } 647 648 scsi_dh_data->scsi_dh = &clariion_dh; 649 h = (struct clariion_dh_data *) scsi_dh_data->buf; 650 h->lun_state = CLARIION_LUN_UNINITIALIZED; 651 h->default_sp = CLARIION_UNBOUND_LU; 652 h->current_sp = CLARIION_UNBOUND_LU; 653 654 err = clariion_std_inquiry(sdev, h); 655 if (err != SCSI_DH_OK) 656 goto failed; 657 658 err = clariion_send_inquiry(sdev, h); 659 if (err != SCSI_DH_OK) 660 goto failed; 661 662 if (!try_module_get(THIS_MODULE)) 663 goto failed; 664 665 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 666 sdev->scsi_dh_data = scsi_dh_data; 667 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 668 669 sdev_printk(KERN_INFO, sdev, 670 "%s: connected to SP %c Port %d (%s, default SP %c)\n", 671 CLARIION_NAME, h->current_sp + 'A', 672 h->port, lun_state[h->lun_state], 673 h->default_sp + 'A'); 674 675 return 0; 676 677failed: 678 kfree(scsi_dh_data); 679 sdev_printk(KERN_ERR, sdev, "%s: not attached\n", 680 CLARIION_NAME); 681 return -EINVAL; 682} 683 684static void clariion_bus_detach(struct scsi_device *sdev) 685{ 686 struct scsi_dh_data *scsi_dh_data; 687 unsigned long flags; 688 689 spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 690 scsi_dh_data = sdev->scsi_dh_data; 691 sdev->scsi_dh_data = NULL; 692 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 693 694 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", 695 CLARIION_NAME); 696 697 kfree(scsi_dh_data); 698 module_put(THIS_MODULE); 699} 700 701static int __init clariion_init(void) 702{ 703 int r; 704 705 r = scsi_register_device_handler(&clariion_dh); 706 if (r != 0) 707 printk(KERN_ERR "%s: Failed to register scsi device handler.", 708 CLARIION_NAME); 709 return r; 710} 711 712static void __exit clariion_exit(void) 713{ 714 scsi_unregister_device_handler(&clariion_dh); 715} 716 717module_init(clariion_init); 718module_exit(clariion_exit); 719 720MODULE_DESCRIPTION("EMC CX/AX/FC-family driver"); 721MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>"); 722MODULE_LICENSE("GPL"); 723