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22#include <scsi/scsi.h>
23#include <scsi/scsi_eh.h>
24#include <scsi/scsi_dh.h>
25#include <linux/workqueue.h>
26#include <linux/slab.h>
27#include <linux/module.h>
28
29#define RDAC_NAME "rdac"
30#define RDAC_RETRY_COUNT 5
31
32
33
34
35
36
37
38
39#define RDAC_QUIESCENCE_TIME 20
40
41
42
43#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
44
45
46
47
48#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
49
50
51
52
53#define RDAC_FORCED_QUIESENCE 0x02
54
55#define RDAC_TIMEOUT (60 * HZ)
56#define RDAC_RETRIES 3
57
58struct rdac_mode_6_hdr {
59 u8 data_len;
60 u8 medium_type;
61 u8 device_params;
62 u8 block_desc_len;
63};
64
65struct rdac_mode_10_hdr {
66 u16 data_len;
67 u8 medium_type;
68 u8 device_params;
69 u16 reserved;
70 u16 block_desc_len;
71};
72
73struct rdac_mode_common {
74 u8 controller_serial[16];
75 u8 alt_controller_serial[16];
76 u8 rdac_mode[2];
77 u8 alt_rdac_mode[2];
78 u8 quiescence_timeout;
79 u8 rdac_options;
80};
81
82struct rdac_pg_legacy {
83 struct rdac_mode_6_hdr hdr;
84 u8 page_code;
85 u8 page_len;
86 struct rdac_mode_common common;
87#define MODE6_MAX_LUN 32
88 u8 lun_table[MODE6_MAX_LUN];
89 u8 reserved2[32];
90 u8 reserved3;
91 u8 reserved4;
92};
93
94struct rdac_pg_expanded {
95 struct rdac_mode_10_hdr hdr;
96 u8 page_code;
97 u8 subpage_code;
98 u8 page_len[2];
99 struct rdac_mode_common common;
100 u8 lun_table[256];
101 u8 reserved3;
102 u8 reserved4;
103};
104
105struct c9_inquiry {
106 u8 peripheral_info;
107 u8 page_code;
108 u8 reserved1;
109 u8 page_len;
110 u8 page_id[4];
111 u8 avte_cvp;
112 u8 path_prio;
113 u8 reserved2[38];
114};
115
116#define SUBSYS_ID_LEN 16
117#define SLOT_ID_LEN 2
118#define ARRAY_LABEL_LEN 31
119
120struct c4_inquiry {
121 u8 peripheral_info;
122 u8 page_code;
123 u8 reserved1;
124 u8 page_len;
125 u8 page_id[4];
126 u8 subsys_id[SUBSYS_ID_LEN];
127 u8 revision[4];
128 u8 slot_id[SLOT_ID_LEN];
129 u8 reserved[2];
130};
131
132#define UNIQUE_ID_LEN 16
133struct c8_inquiry {
134 u8 peripheral_info;
135 u8 page_code;
136 u8 reserved1;
137 u8 page_len;
138 u8 page_id[4];
139 u8 reserved2[3];
140 u8 vol_uniq_id_len;
141 u8 vol_uniq_id[16];
142 u8 vol_user_label_len;
143 u8 vol_user_label[60];
144 u8 array_uniq_id_len;
145 u8 array_unique_id[UNIQUE_ID_LEN];
146 u8 array_user_label_len;
147 u8 array_user_label[60];
148 u8 lun[8];
149};
150
151struct rdac_controller {
152 u8 array_id[UNIQUE_ID_LEN];
153 int use_ms10;
154 struct kref kref;
155 struct list_head node;
156 union {
157 struct rdac_pg_legacy legacy;
158 struct rdac_pg_expanded expanded;
159 } mode_select;
160 u8 index;
161 u8 array_name[ARRAY_LABEL_LEN];
162 struct Scsi_Host *host;
163 spinlock_t ms_lock;
164 int ms_queued;
165 struct work_struct ms_work;
166 struct scsi_device *ms_sdev;
167 struct list_head ms_head;
168 struct list_head dh_list;
169};
170
171struct c2_inquiry {
172 u8 peripheral_info;
173 u8 page_code;
174 u8 reserved1;
175 u8 page_len;
176 u8 page_id[4];
177 u8 sw_version[3];
178 u8 sw_date[3];
179 u8 features_enabled;
180 u8 max_lun_supported;
181 u8 partitions[239];
182};
183
184struct rdac_dh_data {
185 struct list_head node;
186 struct rdac_controller *ctlr;
187 struct scsi_device *sdev;
188#define UNINITIALIZED_LUN (1 << 8)
189 unsigned lun;
190
191#define RDAC_MODE 0
192#define RDAC_MODE_AVT 1
193#define RDAC_MODE_IOSHIP 2
194 unsigned char mode;
195
196#define RDAC_STATE_ACTIVE 0
197#define RDAC_STATE_PASSIVE 1
198 unsigned char state;
199
200#define RDAC_LUN_UNOWNED 0
201#define RDAC_LUN_OWNED 1
202 char lun_state;
203
204#define RDAC_PREFERRED 0
205#define RDAC_NON_PREFERRED 1
206 char preferred;
207
208 union {
209 struct c2_inquiry c2;
210 struct c4_inquiry c4;
211 struct c8_inquiry c8;
212 struct c9_inquiry c9;
213 } inq;
214};
215
216static const char *mode[] = {
217 "RDAC",
218 "AVT",
219 "IOSHIP",
220};
221static const char *lun_state[] =
222{
223 "unowned",
224 "owned",
225};
226
227struct rdac_queue_data {
228 struct list_head entry;
229 struct rdac_dh_data *h;
230 activate_complete callback_fn;
231 void *callback_data;
232};
233
234static LIST_HEAD(ctlr_list);
235static DEFINE_SPINLOCK(list_lock);
236static struct workqueue_struct *kmpath_rdacd;
237static void send_mode_select(struct work_struct *work);
238
239
240
241
242
243
244static int rdac_logging = 1;
245module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
246MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
247 "Default is 1 - failover logging enabled, "
248 "set it to 0xF to enable all the logs");
249
250#define RDAC_LOG_FAILOVER 0
251#define RDAC_LOG_SENSE 2
252
253#define RDAC_LOG_BITS 2
254
255#define RDAC_LOG_LEVEL(SHIFT) \
256 ((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
257
258#define RDAC_LOG(SHIFT, sdev, f, arg...) \
259do { \
260 if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
261 sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
262} while (0);
263
264static unsigned int rdac_failover_get(struct rdac_controller *ctlr,
265 struct list_head *list,
266 unsigned char *cdb)
267{
268 struct rdac_mode_common *common;
269 unsigned data_size;
270 struct rdac_queue_data *qdata;
271 u8 *lun_table;
272
273 if (ctlr->use_ms10) {
274 struct rdac_pg_expanded *rdac_pg;
275
276 data_size = sizeof(struct rdac_pg_expanded);
277 rdac_pg = &ctlr->mode_select.expanded;
278 memset(rdac_pg, 0, data_size);
279 common = &rdac_pg->common;
280 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
281 rdac_pg->subpage_code = 0x1;
282 rdac_pg->page_len[0] = 0x01;
283 rdac_pg->page_len[1] = 0x28;
284 lun_table = rdac_pg->lun_table;
285 } else {
286 struct rdac_pg_legacy *rdac_pg;
287
288 data_size = sizeof(struct rdac_pg_legacy);
289 rdac_pg = &ctlr->mode_select.legacy;
290 memset(rdac_pg, 0, data_size);
291 common = &rdac_pg->common;
292 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
293 rdac_pg->page_len = 0x68;
294 lun_table = rdac_pg->lun_table;
295 }
296 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
297 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
298 common->rdac_options = RDAC_FORCED_QUIESENCE;
299
300 list_for_each_entry(qdata, list, entry) {
301 lun_table[qdata->h->lun] = 0x81;
302 }
303
304
305 if (ctlr->use_ms10) {
306 cdb[0] = MODE_SELECT_10;
307 cdb[7] = data_size >> 8;
308 cdb[8] = data_size & 0xff;
309 } else {
310 cdb[0] = MODE_SELECT;
311 cdb[4] = data_size;
312 }
313
314 return data_size;
315}
316
317static void release_controller(struct kref *kref)
318{
319 struct rdac_controller *ctlr;
320 ctlr = container_of(kref, struct rdac_controller, kref);
321
322 list_del(&ctlr->node);
323 kfree(ctlr);
324}
325
326static struct rdac_controller *get_controller(int index, char *array_name,
327 u8 *array_id, struct scsi_device *sdev)
328{
329 struct rdac_controller *ctlr, *tmp;
330
331 list_for_each_entry(tmp, &ctlr_list, node) {
332 if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
333 (tmp->index == index) &&
334 (tmp->host == sdev->host)) {
335 kref_get(&tmp->kref);
336 return tmp;
337 }
338 }
339 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
340 if (!ctlr)
341 return NULL;
342
343
344 memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
345 ctlr->index = index;
346 ctlr->host = sdev->host;
347 memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
348
349 kref_init(&ctlr->kref);
350 ctlr->use_ms10 = -1;
351 ctlr->ms_queued = 0;
352 ctlr->ms_sdev = NULL;
353 spin_lock_init(&ctlr->ms_lock);
354 INIT_WORK(&ctlr->ms_work, send_mode_select);
355 INIT_LIST_HEAD(&ctlr->ms_head);
356 list_add(&ctlr->node, &ctlr_list);
357 INIT_LIST_HEAD(&ctlr->dh_list);
358
359 return ctlr;
360}
361
362static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
363 char *array_name, u8 *array_id)
364{
365 int err = SCSI_DH_IO, i;
366 struct c8_inquiry *inqp = &h->inq.c8;
367
368 if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp,
369 sizeof(struct c8_inquiry))) {
370 if (inqp->page_code != 0xc8)
371 return SCSI_DH_NOSYS;
372 if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
373 inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
374 return SCSI_DH_NOSYS;
375 h->lun = inqp->lun[7];
376
377 for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
378 *(array_name+i) = inqp->array_user_label[(2*i)+1];
379
380 *(array_name+ARRAY_LABEL_LEN-1) = '\0';
381 memset(array_id, 0, UNIQUE_ID_LEN);
382 memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
383 err = SCSI_DH_OK;
384 }
385 return err;
386}
387
388static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
389{
390 int err = SCSI_DH_IO, access_state;
391 struct rdac_dh_data *tmp;
392 struct c9_inquiry *inqp = &h->inq.c9;
393
394 h->state = RDAC_STATE_ACTIVE;
395 if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp,
396 sizeof(struct c9_inquiry))) {
397
398 if ((inqp->avte_cvp >> 5) & 0x1)
399 h->mode = RDAC_MODE_IOSHIP;
400 else if (inqp->avte_cvp >> 7)
401 h->mode = RDAC_MODE_AVT;
402 else
403 h->mode = RDAC_MODE;
404
405
406 if (inqp->avte_cvp & 0x1) {
407 h->lun_state = RDAC_LUN_OWNED;
408 access_state = SCSI_ACCESS_STATE_OPTIMAL;
409 } else {
410 h->lun_state = RDAC_LUN_UNOWNED;
411 if (h->mode == RDAC_MODE) {
412 h->state = RDAC_STATE_PASSIVE;
413 access_state = SCSI_ACCESS_STATE_STANDBY;
414 } else
415 access_state = SCSI_ACCESS_STATE_ACTIVE;
416 }
417
418
419 if (inqp->path_prio & 0x1) {
420 h->preferred = RDAC_PREFERRED;
421 access_state |= SCSI_ACCESS_STATE_PREFERRED;
422 } else
423 h->preferred = RDAC_NON_PREFERRED;
424 rcu_read_lock();
425 list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) {
426
427 BUG_ON(!tmp->sdev);
428 tmp->sdev->access_state = access_state;
429 }
430 rcu_read_unlock();
431 err = SCSI_DH_OK;
432 }
433
434 return err;
435}
436
437static int initialize_controller(struct scsi_device *sdev,
438 struct rdac_dh_data *h, char *array_name, u8 *array_id)
439{
440 int err = SCSI_DH_IO, index;
441 struct c4_inquiry *inqp = &h->inq.c4;
442
443 if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp,
444 sizeof(struct c4_inquiry))) {
445
446 if (inqp->slot_id[1] == 0x31)
447 index = 0;
448 else
449 index = 1;
450
451 spin_lock(&list_lock);
452 h->ctlr = get_controller(index, array_name, array_id, sdev);
453 if (!h->ctlr)
454 err = SCSI_DH_RES_TEMP_UNAVAIL;
455 else {
456 list_add_rcu(&h->node, &h->ctlr->dh_list);
457 h->sdev = sdev;
458 }
459 spin_unlock(&list_lock);
460 err = SCSI_DH_OK;
461 }
462 return err;
463}
464
465static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
466{
467 int err = SCSI_DH_IO;
468 struct c2_inquiry *inqp = &h->inq.c2;
469
470 if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp,
471 sizeof(struct c2_inquiry))) {
472
473
474
475
476 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
477 h->ctlr->use_ms10 = 1;
478 else
479 h->ctlr->use_ms10 = 0;
480 err = SCSI_DH_OK;
481 }
482 return err;
483}
484
485static int mode_select_handle_sense(struct scsi_device *sdev,
486 struct scsi_sense_hdr *sense_hdr)
487{
488 int err = SCSI_DH_IO;
489 struct rdac_dh_data *h = sdev->handler_data;
490
491 if (!scsi_sense_valid(sense_hdr))
492 goto done;
493
494 switch (sense_hdr->sense_key) {
495 case NO_SENSE:
496 case ABORTED_COMMAND:
497 case UNIT_ATTENTION:
498 err = SCSI_DH_RETRY;
499 break;
500 case NOT_READY:
501 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
502
503
504
505 err = SCSI_DH_RETRY;
506 break;
507 case ILLEGAL_REQUEST:
508 if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36)
509
510
511
512 err = SCSI_DH_IMM_RETRY;
513 break;
514 default:
515 break;
516 }
517
518 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
519 "MODE_SELECT returned with sense %02x/%02x/%02x",
520 (char *) h->ctlr->array_name, h->ctlr->index,
521 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
522
523done:
524 return err;
525}
526
527static void send_mode_select(struct work_struct *work)
528{
529 struct rdac_controller *ctlr =
530 container_of(work, struct rdac_controller, ms_work);
531 struct scsi_device *sdev = ctlr->ms_sdev;
532 struct rdac_dh_data *h = sdev->handler_data;
533 int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
534 struct rdac_queue_data *tmp, *qdata;
535 LIST_HEAD(list);
536 unsigned char cdb[MAX_COMMAND_SIZE];
537 struct scsi_sense_hdr sshdr;
538 unsigned int data_size;
539 u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
540 REQ_FAILFAST_DRIVER;
541
542 spin_lock(&ctlr->ms_lock);
543 list_splice_init(&ctlr->ms_head, &list);
544 ctlr->ms_queued = 0;
545 ctlr->ms_sdev = NULL;
546 spin_unlock(&ctlr->ms_lock);
547
548 retry:
549 memset(cdb, 0, sizeof(cdb));
550
551 data_size = rdac_failover_get(ctlr, &list, cdb);
552
553 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
554 "%s MODE_SELECT command",
555 (char *) h->ctlr->array_name, h->ctlr->index,
556 (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
557
558 if (scsi_execute(sdev, cdb, DMA_TO_DEVICE, &h->ctlr->mode_select,
559 data_size, NULL, &sshdr, RDAC_TIMEOUT * HZ,
560 RDAC_RETRIES, req_flags, 0, NULL)) {
561 err = mode_select_handle_sense(sdev, &sshdr);
562 if (err == SCSI_DH_RETRY && retry_cnt--)
563 goto retry;
564 if (err == SCSI_DH_IMM_RETRY)
565 goto retry;
566 }
567 if (err == SCSI_DH_OK) {
568 h->state = RDAC_STATE_ACTIVE;
569 RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
570 "MODE_SELECT completed",
571 (char *) h->ctlr->array_name, h->ctlr->index);
572 }
573
574 list_for_each_entry_safe(qdata, tmp, &list, entry) {
575 list_del(&qdata->entry);
576 if (err == SCSI_DH_OK)
577 qdata->h->state = RDAC_STATE_ACTIVE;
578 if (qdata->callback_fn)
579 qdata->callback_fn(qdata->callback_data, err);
580 kfree(qdata);
581 }
582 return;
583}
584
585static int queue_mode_select(struct scsi_device *sdev,
586 activate_complete fn, void *data)
587{
588 struct rdac_queue_data *qdata;
589 struct rdac_controller *ctlr;
590
591 qdata = kzalloc(sizeof(*qdata), GFP_KERNEL);
592 if (!qdata)
593 return SCSI_DH_RETRY;
594
595 qdata->h = sdev->handler_data;
596 qdata->callback_fn = fn;
597 qdata->callback_data = data;
598
599 ctlr = qdata->h->ctlr;
600 spin_lock(&ctlr->ms_lock);
601 list_add_tail(&qdata->entry, &ctlr->ms_head);
602 if (!ctlr->ms_queued) {
603 ctlr->ms_queued = 1;
604 ctlr->ms_sdev = sdev;
605 queue_work(kmpath_rdacd, &ctlr->ms_work);
606 }
607 spin_unlock(&ctlr->ms_lock);
608 return SCSI_DH_OK;
609}
610
611static int rdac_activate(struct scsi_device *sdev,
612 activate_complete fn, void *data)
613{
614 struct rdac_dh_data *h = sdev->handler_data;
615 int err = SCSI_DH_OK;
616 int act = 0;
617
618 err = check_ownership(sdev, h);
619 if (err != SCSI_DH_OK)
620 goto done;
621
622 switch (h->mode) {
623 case RDAC_MODE:
624 if (h->lun_state == RDAC_LUN_UNOWNED)
625 act = 1;
626 break;
627 case RDAC_MODE_IOSHIP:
628 if ((h->lun_state == RDAC_LUN_UNOWNED) &&
629 (h->preferred == RDAC_PREFERRED))
630 act = 1;
631 break;
632 default:
633 break;
634 }
635
636 if (act) {
637 err = queue_mode_select(sdev, fn, data);
638 if (err == SCSI_DH_OK)
639 return 0;
640 }
641done:
642 if (fn)
643 fn(data, err);
644 return 0;
645}
646
647static blk_status_t rdac_prep_fn(struct scsi_device *sdev, struct request *req)
648{
649 struct rdac_dh_data *h = sdev->handler_data;
650
651 if (h->state != RDAC_STATE_ACTIVE) {
652 req->rq_flags |= RQF_QUIET;
653 return BLK_STS_IOERR;
654 }
655
656 return BLK_STS_OK;
657}
658
659static int rdac_check_sense(struct scsi_device *sdev,
660 struct scsi_sense_hdr *sense_hdr)
661{
662 struct rdac_dh_data *h = sdev->handler_data;
663
664 RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
665 "I/O returned with sense %02x/%02x/%02x",
666 (char *) h->ctlr->array_name, h->ctlr->index,
667 sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
668
669 switch (sense_hdr->sense_key) {
670 case NOT_READY:
671 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
672
673
674
675
676 return ADD_TO_MLQUEUE;
677 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
678
679
680
681
682
683 return SUCCESS;
684 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
685
686
687
688
689 return ADD_TO_MLQUEUE;
690 if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
691
692
693
694
695 return ADD_TO_MLQUEUE;
696 break;
697 case ILLEGAL_REQUEST:
698 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
699
700
701
702
703 h->state = RDAC_STATE_PASSIVE;
704 return SUCCESS;
705 }
706 break;
707 case UNIT_ATTENTION:
708 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
709
710
711
712 return ADD_TO_MLQUEUE;
713 if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
714
715
716
717 return ADD_TO_MLQUEUE;
718 break;
719 }
720
721 return SCSI_RETURN_NOT_HANDLED;
722}
723
724static int rdac_bus_attach(struct scsi_device *sdev)
725{
726 struct rdac_dh_data *h;
727 int err;
728 char array_name[ARRAY_LABEL_LEN];
729 char array_id[UNIQUE_ID_LEN];
730
731 h = kzalloc(sizeof(*h) , GFP_KERNEL);
732 if (!h)
733 return SCSI_DH_NOMEM;
734 h->lun = UNINITIALIZED_LUN;
735 h->state = RDAC_STATE_ACTIVE;
736
737 err = get_lun_info(sdev, h, array_name, array_id);
738 if (err != SCSI_DH_OK)
739 goto failed;
740
741 err = initialize_controller(sdev, h, array_name, array_id);
742 if (err != SCSI_DH_OK)
743 goto failed;
744
745 err = check_ownership(sdev, h);
746 if (err != SCSI_DH_OK)
747 goto clean_ctlr;
748
749 err = set_mode_select(sdev, h);
750 if (err != SCSI_DH_OK)
751 goto clean_ctlr;
752
753 sdev_printk(KERN_NOTICE, sdev,
754 "%s: LUN %d (%s) (%s)\n",
755 RDAC_NAME, h->lun, mode[(int)h->mode],
756 lun_state[(int)h->lun_state]);
757
758 sdev->handler_data = h;
759 return SCSI_DH_OK;
760
761clean_ctlr:
762 spin_lock(&list_lock);
763 kref_put(&h->ctlr->kref, release_controller);
764 spin_unlock(&list_lock);
765
766failed:
767 kfree(h);
768 return err;
769}
770
771static void rdac_bus_detach( struct scsi_device *sdev )
772{
773 struct rdac_dh_data *h = sdev->handler_data;
774
775 if (h->ctlr && h->ctlr->ms_queued)
776 flush_workqueue(kmpath_rdacd);
777
778 spin_lock(&list_lock);
779 if (h->ctlr) {
780 list_del_rcu(&h->node);
781 h->sdev = NULL;
782 kref_put(&h->ctlr->kref, release_controller);
783 }
784 spin_unlock(&list_lock);
785 sdev->handler_data = NULL;
786 kfree(h);
787}
788
789static struct scsi_device_handler rdac_dh = {
790 .name = RDAC_NAME,
791 .module = THIS_MODULE,
792 .prep_fn = rdac_prep_fn,
793 .check_sense = rdac_check_sense,
794 .attach = rdac_bus_attach,
795 .detach = rdac_bus_detach,
796 .activate = rdac_activate,
797};
798
799static int __init rdac_init(void)
800{
801 int r;
802
803 r = scsi_register_device_handler(&rdac_dh);
804 if (r != 0) {
805 printk(KERN_ERR "Failed to register scsi device handler.");
806 goto done;
807 }
808
809
810
811
812 kmpath_rdacd = create_singlethread_workqueue("kmpath_rdacd");
813 if (!kmpath_rdacd) {
814 scsi_unregister_device_handler(&rdac_dh);
815 printk(KERN_ERR "kmpath_rdacd creation failed.\n");
816
817 r = -EINVAL;
818 }
819done:
820 return r;
821}
822
823static void __exit rdac_exit(void)
824{
825 destroy_workqueue(kmpath_rdacd);
826 scsi_unregister_device_handler(&rdac_dh);
827}
828
829module_init(rdac_init);
830module_exit(rdac_exit);
831
832MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
833MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
834MODULE_VERSION("01.00.0000.0000");
835MODULE_LICENSE("GPL");
836
