1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Serial Attached SCSI (SAS) Transport Layer initialization 4 * 5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved. 6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> 7 */ 8 9#include <linux/module.h> 10#include <linux/slab.h> 11#include <linux/init.h> 12#include <linux/device.h> 13#include <linux/spinlock.h> 14#include <scsi/sas_ata.h> 15#include <scsi/scsi_host.h> 16#include <scsi/scsi_device.h> 17#include <scsi/scsi_transport.h> 18#include <scsi/scsi_transport_sas.h> 19 20#include "sas_internal.h" 21 22#include "scsi_sas_internal.h" 23 24static struct kmem_cache *sas_task_cache; 25static struct kmem_cache *sas_event_cache; 26 27struct sas_task *sas_alloc_task(gfp_t flags) 28{ 29 struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags); 30 31 if (task) { 32 spin_lock_init(&task->task_state_lock); 33 task->task_state_flags = SAS_TASK_STATE_PENDING; 34 } 35 36 return task; 37} 38 39struct sas_task *sas_alloc_slow_task(gfp_t flags) 40{ 41 struct sas_task *task = sas_alloc_task(flags); 42 struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags); 43 44 if (!task || !slow) { 45 if (task) 46 kmem_cache_free(sas_task_cache, task); 47 kfree(slow); 48 return NULL; 49 } 50 51 task->slow_task = slow; 52 slow->task = task; 53 timer_setup(&slow->timer, NULL, 0); 54 init_completion(&slow->completion); 55 56 return task; 57} 58 59void sas_free_task(struct sas_task *task) 60{ 61 if (task) { 62 kfree(task->slow_task); 63 kmem_cache_free(sas_task_cache, task); 64 } 65} 66 67/*------------ SAS addr hash -----------*/ 68void sas_hash_addr(u8 *hashed, const u8 *sas_addr) 69{ 70 const u32 poly = 0x00DB2777; 71 u32 r = 0; 72 int i; 73 74 for (i = 0; i < SAS_ADDR_SIZE; i++) { 75 int b; 76 77 for (b = (SAS_ADDR_SIZE - 1); b >= 0; b--) { 78 r <<= 1; 79 if ((1 << b) & sas_addr[i]) { 80 if (!(r & 0x01000000)) 81 r ^= poly; 82 } else if (r & 0x01000000) { 83 r ^= poly; 84 } 85 } 86 } 87 88 hashed[0] = (r >> 16) & 0xFF; 89 hashed[1] = (r >> 8) & 0xFF; 90 hashed[2] = r & 0xFF; 91} 92 93int sas_register_ha(struct sas_ha_struct *sas_ha) 94{ 95 char name[64]; 96 int error = 0; 97 98 mutex_init(&sas_ha->disco_mutex); 99 spin_lock_init(&sas_ha->phy_port_lock); 100 sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr); 101 102 set_bit(SAS_HA_REGISTERED, &sas_ha->state); 103 spin_lock_init(&sas_ha->lock); 104 mutex_init(&sas_ha->drain_mutex); 105 init_waitqueue_head(&sas_ha->eh_wait_q); 106 INIT_LIST_HEAD(&sas_ha->defer_q); 107 INIT_LIST_HEAD(&sas_ha->eh_dev_q); 108 109 sas_ha->event_thres = SAS_PHY_SHUTDOWN_THRES; 110 111 error = sas_register_phys(sas_ha); 112 if (error) { 113 pr_notice("couldn't register sas phys:%d\n", error); 114 return error; 115 } 116 117 error = sas_register_ports(sas_ha); 118 if (error) { 119 pr_notice("couldn't register sas ports:%d\n", error); 120 goto Undo_phys; 121 } 122 123 error = -ENOMEM; 124 snprintf(name, sizeof(name), "%s_event_q", dev_name(sas_ha->dev)); 125 sas_ha->event_q = create_singlethread_workqueue(name); 126 if (!sas_ha->event_q) 127 goto Undo_ports; 128 129 snprintf(name, sizeof(name), "%s_disco_q", dev_name(sas_ha->dev)); 130 sas_ha->disco_q = create_singlethread_workqueue(name); 131 if (!sas_ha->disco_q) 132 goto Undo_event_q; 133 134 INIT_LIST_HEAD(&sas_ha->eh_done_q); 135 INIT_LIST_HEAD(&sas_ha->eh_ata_q); 136 137 return 0; 138 139Undo_event_q: 140 destroy_workqueue(sas_ha->event_q); 141Undo_ports: 142 sas_unregister_ports(sas_ha); 143Undo_phys: 144 145 return error; 146} 147EXPORT_SYMBOL_GPL(sas_register_ha); 148 149static void sas_disable_events(struct sas_ha_struct *sas_ha) 150{ 151 /* Set the state to unregistered to avoid further unchained 152 * events to be queued, and flush any in-progress drainers 153 */ 154 mutex_lock(&sas_ha->drain_mutex); 155 spin_lock_irq(&sas_ha->lock); 156 clear_bit(SAS_HA_REGISTERED, &sas_ha->state); 157 spin_unlock_irq(&sas_ha->lock); 158 __sas_drain_work(sas_ha); 159 mutex_unlock(&sas_ha->drain_mutex); 160} 161 162int sas_unregister_ha(struct sas_ha_struct *sas_ha) 163{ 164 sas_disable_events(sas_ha); 165 sas_unregister_ports(sas_ha); 166 167 /* flush unregistration work */ 168 mutex_lock(&sas_ha->drain_mutex); 169 __sas_drain_work(sas_ha); 170 mutex_unlock(&sas_ha->drain_mutex); 171 172 destroy_workqueue(sas_ha->disco_q); 173 destroy_workqueue(sas_ha->event_q); 174 175 return 0; 176} 177EXPORT_SYMBOL_GPL(sas_unregister_ha); 178 179static int sas_get_linkerrors(struct sas_phy *phy) 180{ 181 if (scsi_is_sas_phy_local(phy)) { 182 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 183 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 184 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 185 struct sas_internal *i = 186 to_sas_internal(sas_ha->shost->transportt); 187 188 return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL); 189 } 190 191 return sas_smp_get_phy_events(phy); 192} 193 194int sas_try_ata_reset(struct asd_sas_phy *asd_phy) 195{ 196 struct domain_device *dev = NULL; 197 198 /* try to route user requested link resets through libata */ 199 if (asd_phy->port) 200 dev = asd_phy->port->port_dev; 201 202 /* validate that dev has been probed */ 203 if (dev) 204 dev = sas_find_dev_by_rphy(dev->rphy); 205 206 if (dev && dev_is_sata(dev)) { 207 sas_ata_schedule_reset(dev); 208 sas_ata_wait_eh(dev); 209 return 0; 210 } 211 212 return -ENODEV; 213} 214 215/* 216 * transport_sas_phy_reset - reset a phy and permit libata to manage the link 217 * 218 * phy reset request via sysfs in host workqueue context so we know we 219 * can block on eh and safely traverse the domain_device topology 220 */ 221static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset) 222{ 223 enum phy_func reset_type; 224 225 if (hard_reset) 226 reset_type = PHY_FUNC_HARD_RESET; 227 else 228 reset_type = PHY_FUNC_LINK_RESET; 229 230 if (scsi_is_sas_phy_local(phy)) { 231 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 232 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 233 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 234 struct sas_internal *i = 235 to_sas_internal(sas_ha->shost->transportt); 236 237 if (!hard_reset && sas_try_ata_reset(asd_phy) == 0) 238 return 0; 239 return i->dft->lldd_control_phy(asd_phy, reset_type, NULL); 240 } else { 241 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 242 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 243 struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number); 244 245 if (ata_dev && !hard_reset) { 246 sas_ata_schedule_reset(ata_dev); 247 sas_ata_wait_eh(ata_dev); 248 return 0; 249 } else 250 return sas_smp_phy_control(ddev, phy->number, reset_type, NULL); 251 } 252} 253 254int sas_phy_enable(struct sas_phy *phy, int enable) 255{ 256 int ret; 257 enum phy_func cmd; 258 259 if (enable) 260 cmd = PHY_FUNC_LINK_RESET; 261 else 262 cmd = PHY_FUNC_DISABLE; 263 264 if (scsi_is_sas_phy_local(phy)) { 265 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 266 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 267 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 268 struct sas_internal *i = 269 to_sas_internal(sas_ha->shost->transportt); 270 271 if (enable) 272 ret = transport_sas_phy_reset(phy, 0); 273 else 274 ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL); 275 } else { 276 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 277 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 278 279 if (enable) 280 ret = transport_sas_phy_reset(phy, 0); 281 else 282 ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL); 283 } 284 return ret; 285} 286EXPORT_SYMBOL_GPL(sas_phy_enable); 287 288int sas_phy_reset(struct sas_phy *phy, int hard_reset) 289{ 290 int ret; 291 enum phy_func reset_type; 292 293 if (!phy->enabled) 294 return -ENODEV; 295 296 if (hard_reset) 297 reset_type = PHY_FUNC_HARD_RESET; 298 else 299 reset_type = PHY_FUNC_LINK_RESET; 300 301 if (scsi_is_sas_phy_local(phy)) { 302 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 303 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 304 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 305 struct sas_internal *i = 306 to_sas_internal(sas_ha->shost->transportt); 307 308 ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); 309 } else { 310 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 311 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 312 ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); 313 } 314 return ret; 315} 316EXPORT_SYMBOL_GPL(sas_phy_reset); 317 318static int sas_set_phy_speed(struct sas_phy *phy, 319 struct sas_phy_linkrates *rates) 320{ 321 int ret; 322 323 if ((rates->minimum_linkrate && 324 rates->minimum_linkrate > phy->maximum_linkrate) || 325 (rates->maximum_linkrate && 326 rates->maximum_linkrate < phy->minimum_linkrate)) 327 return -EINVAL; 328 329 if (rates->minimum_linkrate && 330 rates->minimum_linkrate < phy->minimum_linkrate_hw) 331 rates->minimum_linkrate = phy->minimum_linkrate_hw; 332 333 if (rates->maximum_linkrate && 334 rates->maximum_linkrate > phy->maximum_linkrate_hw) 335 rates->maximum_linkrate = phy->maximum_linkrate_hw; 336 337 if (scsi_is_sas_phy_local(phy)) { 338 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 339 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 340 struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; 341 struct sas_internal *i = 342 to_sas_internal(sas_ha->shost->transportt); 343 344 ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, 345 rates); 346 } else { 347 struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); 348 struct domain_device *ddev = sas_find_dev_by_rphy(rphy); 349 ret = sas_smp_phy_control(ddev, phy->number, 350 PHY_FUNC_LINK_RESET, rates); 351 352 } 353 354 return ret; 355} 356 357void sas_prep_resume_ha(struct sas_ha_struct *ha) 358{ 359 int i; 360 361 set_bit(SAS_HA_REGISTERED, &ha->state); 362 set_bit(SAS_HA_RESUMING, &ha->state); 363 364 /* clear out any stale link events/data from the suspension path */ 365 for (i = 0; i < ha->num_phys; i++) { 366 struct asd_sas_phy *phy = ha->sas_phy[i]; 367 368 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE); 369 phy->frame_rcvd_size = 0; 370 } 371} 372EXPORT_SYMBOL(sas_prep_resume_ha); 373 374static int phys_suspended(struct sas_ha_struct *ha) 375{ 376 int i, rc = 0; 377 378 for (i = 0; i < ha->num_phys; i++) { 379 struct asd_sas_phy *phy = ha->sas_phy[i]; 380 381 if (phy->suspended) 382 rc++; 383 } 384 385 return rc; 386} 387 388static void sas_resume_insert_broadcast_ha(struct sas_ha_struct *ha) 389{ 390 int i; 391 392 for (i = 0; i < ha->num_phys; i++) { 393 struct asd_sas_port *port = ha->sas_port[i]; 394 struct domain_device *dev = port->port_dev; 395 396 if (dev && dev_is_expander(dev->dev_type)) { 397 struct asd_sas_phy *first_phy; 398 399 spin_lock(&port->phy_list_lock); 400 first_phy = list_first_entry_or_null( 401 &port->phy_list, struct asd_sas_phy, 402 port_phy_el); 403 spin_unlock(&port->phy_list_lock); 404 405 if (first_phy) 406 sas_notify_port_event(first_phy, 407 PORTE_BROADCAST_RCVD, GFP_KERNEL); 408 } 409 } 410} 411 412static void _sas_resume_ha(struct sas_ha_struct *ha, bool drain) 413{ 414 const unsigned long tmo = msecs_to_jiffies(25000); 415 int i; 416 417 /* deform ports on phys that did not resume 418 * at this point we may be racing the phy coming back (as posted 419 * by the lldd). So we post the event and once we are in the 420 * libsas context check that the phy remains suspended before 421 * tearing it down. 422 */ 423 i = phys_suspended(ha); 424 if (i) 425 dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n", 426 i, i > 1 ? "s" : ""); 427 wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo); 428 for (i = 0; i < ha->num_phys; i++) { 429 struct asd_sas_phy *phy = ha->sas_phy[i]; 430 431 if (phy->suspended) { 432 dev_warn(&phy->phy->dev, "resume timeout\n"); 433 sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT, 434 GFP_KERNEL); 435 } 436 } 437 438 /* all phys are back up or timed out, turn on i/o so we can 439 * flush out disks that did not return 440 */ 441 scsi_unblock_requests(ha->shost); 442 if (drain) 443 sas_drain_work(ha); 444 clear_bit(SAS_HA_RESUMING, &ha->state); 445 446 sas_queue_deferred_work(ha); 447 /* send event PORTE_BROADCAST_RCVD to identify some new inserted 448 * disks for expander 449 */ 450 sas_resume_insert_broadcast_ha(ha); 451} 452 453void sas_resume_ha(struct sas_ha_struct *ha) 454{ 455 _sas_resume_ha(ha, true); 456} 457EXPORT_SYMBOL(sas_resume_ha); 458 459/* A no-sync variant, which does not call sas_drain_ha(). */ 460void sas_resume_ha_no_sync(struct sas_ha_struct *ha) 461{ 462 _sas_resume_ha(ha, false); 463} 464EXPORT_SYMBOL(sas_resume_ha_no_sync); 465 466void sas_suspend_ha(struct sas_ha_struct *ha) 467{ 468 int i; 469 470 sas_disable_events(ha); 471 scsi_block_requests(ha->shost); 472 for (i = 0; i < ha->num_phys; i++) { 473 struct asd_sas_port *port = ha->sas_port[i]; 474 475 sas_discover_event(port, DISCE_SUSPEND); 476 } 477 478 /* flush suspend events while unregistered */ 479 mutex_lock(&ha->drain_mutex); 480 __sas_drain_work(ha); 481 mutex_unlock(&ha->drain_mutex); 482} 483EXPORT_SYMBOL(sas_suspend_ha); 484 485static void sas_phy_release(struct sas_phy *phy) 486{ 487 kfree(phy->hostdata); 488 phy->hostdata = NULL; 489} 490 491static void phy_reset_work(struct work_struct *work) 492{ 493 struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work); 494 495 d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset); 496} 497 498static void phy_enable_work(struct work_struct *work) 499{ 500 struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work); 501 502 d->enable_result = sas_phy_enable(d->phy, d->enable); 503} 504 505static int sas_phy_setup(struct sas_phy *phy) 506{ 507 struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL); 508 509 if (!d) 510 return -ENOMEM; 511 512 mutex_init(&d->event_lock); 513 INIT_SAS_WORK(&d->reset_work, phy_reset_work); 514 INIT_SAS_WORK(&d->enable_work, phy_enable_work); 515 d->phy = phy; 516 phy->hostdata = d; 517 518 return 0; 519} 520 521static int queue_phy_reset(struct sas_phy *phy, int hard_reset) 522{ 523 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 524 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 525 struct sas_phy_data *d = phy->hostdata; 526 int rc; 527 528 if (!d) 529 return -ENOMEM; 530 531 pm_runtime_get_sync(ha->dev); 532 /* libsas workqueue coordinates ata-eh reset with discovery */ 533 mutex_lock(&d->event_lock); 534 d->reset_result = 0; 535 d->hard_reset = hard_reset; 536 537 spin_lock_irq(&ha->lock); 538 sas_queue_work(ha, &d->reset_work); 539 spin_unlock_irq(&ha->lock); 540 541 rc = sas_drain_work(ha); 542 if (rc == 0) 543 rc = d->reset_result; 544 mutex_unlock(&d->event_lock); 545 pm_runtime_put_sync(ha->dev); 546 547 return rc; 548} 549 550static int queue_phy_enable(struct sas_phy *phy, int enable) 551{ 552 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); 553 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 554 struct sas_phy_data *d = phy->hostdata; 555 int rc; 556 557 if (!d) 558 return -ENOMEM; 559 560 pm_runtime_get_sync(ha->dev); 561 /* libsas workqueue coordinates ata-eh reset with discovery */ 562 mutex_lock(&d->event_lock); 563 d->enable_result = 0; 564 d->enable = enable; 565 566 spin_lock_irq(&ha->lock); 567 sas_queue_work(ha, &d->enable_work); 568 spin_unlock_irq(&ha->lock); 569 570 rc = sas_drain_work(ha); 571 if (rc == 0) 572 rc = d->enable_result; 573 mutex_unlock(&d->event_lock); 574 pm_runtime_put_sync(ha->dev); 575 576 return rc; 577} 578 579static struct sas_function_template sft = { 580 .phy_enable = queue_phy_enable, 581 .phy_reset = queue_phy_reset, 582 .phy_setup = sas_phy_setup, 583 .phy_release = sas_phy_release, 584 .set_phy_speed = sas_set_phy_speed, 585 .get_linkerrors = sas_get_linkerrors, 586 .smp_handler = sas_smp_handler, 587}; 588 589static inline ssize_t phy_event_threshold_show(struct device *dev, 590 struct device_attribute *attr, char *buf) 591{ 592 struct Scsi_Host *shost = class_to_shost(dev); 593 struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost); 594 595 return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres); 596} 597 598static inline ssize_t phy_event_threshold_store(struct device *dev, 599 struct device_attribute *attr, 600 const char *buf, size_t count) 601{ 602 struct Scsi_Host *shost = class_to_shost(dev); 603 struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost); 604 605 sha->event_thres = simple_strtol(buf, NULL, 10); 606 607 /* threshold cannot be set too small */ 608 if (sha->event_thres < 32) 609 sha->event_thres = 32; 610 611 return count; 612} 613 614DEVICE_ATTR(phy_event_threshold, 615 S_IRUGO|S_IWUSR, 616 phy_event_threshold_show, 617 phy_event_threshold_store); 618EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold); 619 620struct scsi_transport_template * 621sas_domain_attach_transport(struct sas_domain_function_template *dft) 622{ 623 struct scsi_transport_template *stt = sas_attach_transport(&sft); 624 struct sas_internal *i; 625 626 if (!stt) 627 return stt; 628 629 i = to_sas_internal(stt); 630 i->dft = dft; 631 stt->create_work_queue = 1; 632 stt->eh_strategy_handler = sas_scsi_recover_host; 633 634 return stt; 635} 636EXPORT_SYMBOL_GPL(sas_domain_attach_transport); 637 638struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy, 639 gfp_t gfp_flags) 640{ 641 struct asd_sas_event *event; 642 struct sas_ha_struct *sas_ha = phy->ha; 643 struct sas_internal *i = 644 to_sas_internal(sas_ha->shost->transportt); 645 646 event = kmem_cache_zalloc(sas_event_cache, gfp_flags); 647 if (!event) 648 return NULL; 649 650 atomic_inc(&phy->event_nr); 651 652 if (atomic_read(&phy->event_nr) > phy->ha->event_thres) { 653 if (i->dft->lldd_control_phy) { 654 if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) { 655 pr_notice("The phy%d bursting events, shut it down.\n", 656 phy->id); 657 sas_notify_phy_event(phy, PHYE_SHUTDOWN, 658 gfp_flags); 659 } 660 } else { 661 /* Do not support PHY control, stop allocating events */ 662 WARN_ONCE(1, "PHY control not supported.\n"); 663 kmem_cache_free(sas_event_cache, event); 664 atomic_dec(&phy->event_nr); 665 event = NULL; 666 } 667 } 668 669 return event; 670} 671 672void sas_free_event(struct asd_sas_event *event) 673{ 674 struct asd_sas_phy *phy = event->phy; 675 676 kmem_cache_free(sas_event_cache, event); 677 atomic_dec(&phy->event_nr); 678} 679 680/* ---------- SAS Class register/unregister ---------- */ 681 682static int __init sas_class_init(void) 683{ 684 sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN); 685 if (!sas_task_cache) 686 goto out; 687 688 sas_event_cache = KMEM_CACHE(asd_sas_event, SLAB_HWCACHE_ALIGN); 689 if (!sas_event_cache) 690 goto free_task_kmem; 691 692 return 0; 693free_task_kmem: 694 kmem_cache_destroy(sas_task_cache); 695out: 696 return -ENOMEM; 697} 698 699static void __exit sas_class_exit(void) 700{ 701 kmem_cache_destroy(sas_task_cache); 702 kmem_cache_destroy(sas_event_cache); 703} 704 705MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>"); 706MODULE_DESCRIPTION("SAS Transport Layer"); 707MODULE_LICENSE("GPL v2"); 708 709module_init(sas_class_init); 710module_exit(sas_class_exit); 711 712