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-rw-r--r--drivers/scsi/device_handler/Kconfig6
-rw-r--r--drivers/scsi/device_handler/Makefile1
-rw-r--r--drivers/scsi/device_handler/scsi_dh_rdac.c691
3 files changed, 698 insertions, 0 deletions
diff --git a/drivers/scsi/device_handler/Kconfig b/drivers/scsi/device_handler/Kconfig
index 228241d1d98c..404f37732627 100644
--- a/drivers/scsi/device_handler/Kconfig
+++ b/drivers/scsi/device_handler/Kconfig
@@ -10,3 +10,9 @@ menuconfig SCSI_DH
10 SCSI Device Handlers provide device specific support for 10 SCSI Device Handlers provide device specific support for
11 devices utilized in multipath configurations. Say Y here to 11 devices utilized in multipath configurations. Say Y here to
12 select support for specific hardware. 12 select support for specific hardware.
13
14config SCSI_DH_RDAC
15 tristate "LSI RDAC Device Handler"
16 depends on SCSI_DH
17 help
18 If you have a LSI RDAC select y. Otherwise, say N.
diff --git a/drivers/scsi/device_handler/Makefile b/drivers/scsi/device_handler/Makefile
index f306e44e3837..1a42b3498318 100644
--- a/drivers/scsi/device_handler/Makefile
+++ b/drivers/scsi/device_handler/Makefile
@@ -2,3 +2,4 @@
2# SCSI Device Handler 2# SCSI Device Handler
3# 3#
4obj-$(CONFIG_SCSI_DH) += scsi_dh.o 4obj-$(CONFIG_SCSI_DH) += scsi_dh.o
5obj-$(CONFIG_SCSI_DH_RDAC) += scsi_dh_rdac.o
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
new file mode 100644
index 000000000000..6fff077a888d
--- /dev/null
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -0,0 +1,691 @@
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
28/*
29 * LSI mode page stuff
30 *
31 * These struct definitions and the forming of the
32 * mode page were taken from the LSI RDAC 2.4 GPL'd
33 * driver, and then converted to Linux conventions.
34 */
35#define RDAC_QUIESCENCE_TIME 20;
36/*
37 * Page Codes
38 */
39#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
40
41/*
42 * Controller modes definitions
43 */
44#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
45
46/*
47 * RDAC Options field
48 */
49#define RDAC_FORCED_QUIESENCE 0x02
50
51#define RDAC_TIMEOUT (60 * HZ)
52#define RDAC_RETRIES 3
53
54struct rdac_mode_6_hdr {
55 u8 data_len;
56 u8 medium_type;
57 u8 device_params;
58 u8 block_desc_len;
59};
60
61struct rdac_mode_10_hdr {
62 u16 data_len;
63 u8 medium_type;
64 u8 device_params;
65 u16 reserved;
66 u16 block_desc_len;
67};
68
69struct rdac_mode_common {
70 u8 controller_serial[16];
71 u8 alt_controller_serial[16];
72 u8 rdac_mode[2];
73 u8 alt_rdac_mode[2];
74 u8 quiescence_timeout;
75 u8 rdac_options;
76};
77
78struct rdac_pg_legacy {
79 struct rdac_mode_6_hdr hdr;
80 u8 page_code;
81 u8 page_len;
82 struct rdac_mode_common common;
83#define MODE6_MAX_LUN 32
84 u8 lun_table[MODE6_MAX_LUN];
85 u8 reserved2[32];
86 u8 reserved3;
87 u8 reserved4;
88};
89
90struct rdac_pg_expanded {
91 struct rdac_mode_10_hdr hdr;
92 u8 page_code;
93 u8 subpage_code;
94 u8 page_len[2];
95 struct rdac_mode_common common;
96 u8 lun_table[256];
97 u8 reserved3;
98 u8 reserved4;
99};
100
101struct c9_inquiry {
102 u8 peripheral_info;
103 u8 page_code; /* 0xC9 */
104 u8 reserved1;
105 u8 page_len;
106 u8 page_id[4]; /* "vace" */
107 u8 avte_cvp;
108 u8 path_prio;
109 u8 reserved2[38];
110};
111
112#define SUBSYS_ID_LEN 16
113#define SLOT_ID_LEN 2
114
115struct c4_inquiry {
116 u8 peripheral_info;
117 u8 page_code; /* 0xC4 */
118 u8 reserved1;
119 u8 page_len;
120 u8 page_id[4]; /* "subs" */
121 u8 subsys_id[SUBSYS_ID_LEN];
122 u8 revision[4];
123 u8 slot_id[SLOT_ID_LEN];
124 u8 reserved[2];
125};
126
127struct rdac_controller {
128 u8 subsys_id[SUBSYS_ID_LEN];
129 u8 slot_id[SLOT_ID_LEN];
130 int use_ms10;
131 struct kref kref;
132 struct list_head node; /* list of all controllers */
133 union {
134 struct rdac_pg_legacy legacy;
135 struct rdac_pg_expanded expanded;
136 } mode_select;
137};
138struct c8_inquiry {
139 u8 peripheral_info;
140 u8 page_code; /* 0xC8 */
141 u8 reserved1;
142 u8 page_len;
143 u8 page_id[4]; /* "edid" */
144 u8 reserved2[3];
145 u8 vol_uniq_id_len;
146 u8 vol_uniq_id[16];
147 u8 vol_user_label_len;
148 u8 vol_user_label[60];
149 u8 array_uniq_id_len;
150 u8 array_unique_id[16];
151 u8 array_user_label_len;
152 u8 array_user_label[60];
153 u8 lun[8];
154};
155
156struct c2_inquiry {
157 u8 peripheral_info;
158 u8 page_code; /* 0xC2 */
159 u8 reserved1;
160 u8 page_len;
161 u8 page_id[4]; /* "swr4" */
162 u8 sw_version[3];
163 u8 sw_date[3];
164 u8 features_enabled;
165 u8 max_lun_supported;
166 u8 partitions[239]; /* Total allocation length should be 0xFF */
167};
168
169struct rdac_dh_data {
170 struct rdac_controller *ctlr;
171#define UNINITIALIZED_LUN (1 << 8)
172 unsigned lun;
173#define RDAC_STATE_ACTIVE 0
174#define RDAC_STATE_PASSIVE 1
175 unsigned char state;
176 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
177 union {
178 struct c2_inquiry c2;
179 struct c4_inquiry c4;
180 struct c8_inquiry c8;
181 struct c9_inquiry c9;
182 } inq;
183};
184
185static LIST_HEAD(ctlr_list);
186static DEFINE_SPINLOCK(list_lock);
187
188static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
189{
190 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
191 BUG_ON(scsi_dh_data == NULL);
192 return ((struct rdac_dh_data *) scsi_dh_data->buf);
193}
194
195static struct request *get_rdac_req(struct scsi_device *sdev,
196 void *buffer, unsigned buflen, int rw)
197{
198 struct request *rq;
199 struct request_queue *q = sdev->request_queue;
200 struct rdac_dh_data *h = get_rdac_data(sdev);
201
202 rq = blk_get_request(q, rw, GFP_KERNEL);
203
204 if (!rq) {
205 sdev_printk(KERN_INFO, sdev,
206 "get_rdac_req: blk_get_request failed.\n");
207 return NULL;
208 }
209
210 if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_KERNEL)) {
211 blk_put_request(rq);
212 sdev_printk(KERN_INFO, sdev,
213 "get_rdac_req: blk_rq_map_kern failed.\n");
214 return NULL;
215 }
216
217 memset(&rq->cmd, 0, BLK_MAX_CDB);
218 rq->sense = h->sense;
219 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
220 rq->sense_len = 0;
221
222 rq->cmd_type = REQ_TYPE_BLOCK_PC;
223 rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
224 rq->retries = RDAC_RETRIES;
225 rq->timeout = RDAC_TIMEOUT;
226
227 return rq;
228}
229
230static struct request *rdac_failover_get(struct scsi_device *sdev)
231{
232 struct request *rq;
233 struct rdac_mode_common *common;
234 unsigned data_size;
235 struct rdac_dh_data *h = get_rdac_data(sdev);
236
237 if (h->ctlr->use_ms10) {
238 struct rdac_pg_expanded *rdac_pg;
239
240 data_size = sizeof(struct rdac_pg_expanded);
241 rdac_pg = &h->ctlr->mode_select.expanded;
242 memset(rdac_pg, 0, data_size);
243 common = &rdac_pg->common;
244 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
245 rdac_pg->subpage_code = 0x1;
246 rdac_pg->page_len[0] = 0x01;
247 rdac_pg->page_len[1] = 0x28;
248 rdac_pg->lun_table[h->lun] = 0x81;
249 } else {
250 struct rdac_pg_legacy *rdac_pg;
251
252 data_size = sizeof(struct rdac_pg_legacy);
253 rdac_pg = &h->ctlr->mode_select.legacy;
254 memset(rdac_pg, 0, data_size);
255 common = &rdac_pg->common;
256 rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
257 rdac_pg->page_len = 0x68;
258 rdac_pg->lun_table[h->lun] = 0x81;
259 }
260 common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
261 common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
262 common->rdac_options = RDAC_FORCED_QUIESENCE;
263
264 /* get request for block layer packet command */
265 rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
266 if (!rq)
267 return NULL;
268
269 /* Prepare the command. */
270 if (h->ctlr->use_ms10) {
271 rq->cmd[0] = MODE_SELECT_10;
272 rq->cmd[7] = data_size >> 8;
273 rq->cmd[8] = data_size & 0xff;
274 } else {
275 rq->cmd[0] = MODE_SELECT;
276 rq->cmd[4] = data_size;
277 }
278 rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
279
280 return rq;
281}
282
283static void release_controller(struct kref *kref)
284{
285 struct rdac_controller *ctlr;
286 ctlr = container_of(kref, struct rdac_controller, kref);
287
288 spin_lock(&list_lock);
289 list_del(&ctlr->node);
290 spin_unlock(&list_lock);
291 kfree(ctlr);
292}
293
294static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id)
295{
296 struct rdac_controller *ctlr, *tmp;
297
298 spin_lock(&list_lock);
299
300 list_for_each_entry(tmp, &ctlr_list, node) {
301 if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
302 (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
303 kref_get(&tmp->kref);
304 spin_unlock(&list_lock);
305 return tmp;
306 }
307 }
308 ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
309 if (!ctlr)
310 goto done;
311
312 /* initialize fields of controller */
313 memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
314 memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
315 kref_init(&ctlr->kref);
316 ctlr->use_ms10 = -1;
317 list_add(&ctlr->node, &ctlr_list);
318done:
319 spin_unlock(&list_lock);
320 return ctlr;
321}
322
323static int submit_inquiry(struct scsi_device *sdev, int page_code,
324 unsigned int len)
325{
326 struct request *rq;
327 struct request_queue *q = sdev->request_queue;
328 struct rdac_dh_data *h = get_rdac_data(sdev);
329 int err = SCSI_DH_RES_TEMP_UNAVAIL;
330
331 rq = get_rdac_req(sdev, &h->inq, len, READ);
332 if (!rq)
333 goto done;
334
335 /* Prepare the command. */
336 rq->cmd[0] = INQUIRY;
337 rq->cmd[1] = 1;
338 rq->cmd[2] = page_code;
339 rq->cmd[4] = len;
340 rq->cmd_len = COMMAND_SIZE(INQUIRY);
341 err = blk_execute_rq(q, NULL, rq, 1);
342 if (err == -EIO)
343 err = SCSI_DH_IO;
344done:
345 return err;
346}
347
348static int get_lun(struct scsi_device *sdev)
349{
350 int err;
351 struct c8_inquiry *inqp;
352 struct rdac_dh_data *h = get_rdac_data(sdev);
353
354 err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry));
355 if (err == SCSI_DH_OK) {
356 inqp = &h->inq.c8;
357 h->lun = inqp->lun[7]; /* currently it uses only one byte */
358 }
359 return err;
360}
361
362#define RDAC_OWNED 0
363#define RDAC_UNOWNED 1
364#define RDAC_FAILED 2
365static int check_ownership(struct scsi_device *sdev)
366{
367 int err;
368 struct c9_inquiry *inqp;
369 struct rdac_dh_data *h = get_rdac_data(sdev);
370
371 err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry));
372 if (err == SCSI_DH_OK) {
373 err = RDAC_UNOWNED;
374 inqp = &h->inq.c9;
375 /*
376 * If in AVT mode or if the path already owns the LUN,
377 * return RDAC_OWNED;
378 */
379 if (((inqp->avte_cvp >> 7) == 0x1) ||
380 ((inqp->avte_cvp & 0x1) != 0))
381 err = RDAC_OWNED;
382 } else
383 err = RDAC_FAILED;
384 return err;
385}
386
387static int initialize_controller(struct scsi_device *sdev)
388{
389 int err;
390 struct c4_inquiry *inqp;
391 struct rdac_dh_data *h = get_rdac_data(sdev);
392
393 err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry));
394 if (err == SCSI_DH_OK) {
395 inqp = &h->inq.c4;
396 h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id);
397 if (!h->ctlr)
398 err = SCSI_DH_RES_TEMP_UNAVAIL;
399 }
400 return err;
401}
402
403static int set_mode_select(struct scsi_device *sdev)
404{
405 int err;
406 struct c2_inquiry *inqp;
407 struct rdac_dh_data *h = get_rdac_data(sdev);
408
409 err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry));
410 if (err == SCSI_DH_OK) {
411 inqp = &h->inq.c2;
412 /*
413 * If more than MODE6_MAX_LUN luns are supported, use
414 * mode select 10
415 */
416 if (inqp->max_lun_supported >= MODE6_MAX_LUN)
417 h->ctlr->use_ms10 = 1;
418 else
419 h->ctlr->use_ms10 = 0;
420 }
421 return err;
422}
423
424static int mode_select_handle_sense(struct scsi_device *sdev)
425{
426 struct scsi_sense_hdr sense_hdr;
427 struct rdac_dh_data *h = get_rdac_data(sdev);
428 int sense, err = SCSI_DH_IO, ret;
429
430 ret = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
431 if (!ret)
432 goto done;
433
434 err = SCSI_DH_OK;
435 sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) |
436 sense_hdr.ascq;
437 /* If it is retryable failure, submit the c9 inquiry again */
438 if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 ||
439 sense == 0x62900) {
440 /* 0x59136 - Command lock contention
441 * 0x[6b]8b02 - Quiesense in progress or achieved
442 * 0x62900 - Power On, Reset, or Bus Device Reset
443 */
444 err = SCSI_DH_RETRY;
445 }
446
447 if (sense)
448 sdev_printk(KERN_INFO, sdev,
449 "MODE_SELECT failed with sense 0x%x.\n", sense);
450done:
451 return err;
452}
453
454static int send_mode_select(struct scsi_device *sdev)
455{
456 struct request *rq;
457 struct request_queue *q = sdev->request_queue;
458 struct rdac_dh_data *h = get_rdac_data(sdev);
459 int err = SCSI_DH_RES_TEMP_UNAVAIL;
460
461 rq = rdac_failover_get(sdev);
462 if (!rq)
463 goto done;
464
465 sdev_printk(KERN_INFO, sdev, "queueing MODE_SELECT command.\n");
466
467 err = blk_execute_rq(q, NULL, rq, 1);
468 if (err != SCSI_DH_OK)
469 err = mode_select_handle_sense(sdev);
470 if (err == SCSI_DH_OK)
471 h->state = RDAC_STATE_ACTIVE;
472done:
473 return err;
474}
475
476static int rdac_activate(struct scsi_device *sdev)
477{
478 struct rdac_dh_data *h = get_rdac_data(sdev);
479 int err = SCSI_DH_OK;
480
481 if (h->lun == UNINITIALIZED_LUN) {
482 err = get_lun(sdev);
483 if (err != SCSI_DH_OK)
484 goto done;
485 }
486
487 err = check_ownership(sdev);
488 switch (err) {
489 case RDAC_UNOWNED:
490 break;
491 case RDAC_OWNED:
492 err = SCSI_DH_OK;
493 goto done;
494 case RDAC_FAILED:
495 default:
496 err = SCSI_DH_IO;
497 goto done;
498 }
499
500 if (!h->ctlr) {
501 err = initialize_controller(sdev);
502 if (err != SCSI_DH_OK)
503 goto done;
504 }
505
506 if (h->ctlr->use_ms10 == -1) {
507 err = set_mode_select(sdev);
508 if (err != SCSI_DH_OK)
509 goto done;
510 }
511
512 err = send_mode_select(sdev);
513done:
514 return err;
515}
516
517static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
518{
519 struct rdac_dh_data *h = get_rdac_data(sdev);
520 int ret = BLKPREP_OK;
521
522 if (h->state != RDAC_STATE_ACTIVE) {
523 ret = BLKPREP_KILL;
524 req->cmd_flags |= REQ_QUIET;
525 }
526 return ret;
527
528}
529
530static int rdac_check_sense(struct scsi_device *sdev,
531 struct scsi_sense_hdr *sense_hdr)
532{
533 struct rdac_dh_data *h = get_rdac_data(sdev);
534 switch (sense_hdr->sense_key) {
535 case NOT_READY:
536 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
537 /* LUN Not Ready - Storage firmware incompatible
538 * Manual code synchonisation required.
539 *
540 * Nothing we can do here. Try to bypass the path.
541 */
542 return SUCCESS;
543 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
544 /* LUN Not Ready - Quiescense in progress
545 *
546 * Just retry and wait.
547 */
548 return NEEDS_RETRY;
549 break;
550 case ILLEGAL_REQUEST:
551 if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
552 /* Invalid Request - Current Logical Unit Ownership.
553 * Controller is not the current owner of the LUN,
554 * Fail the path, so that the other path be used.
555 */
556 h->state = RDAC_STATE_PASSIVE;
557 return SUCCESS;
558 }
559 break;
560 case UNIT_ATTENTION:
561 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
562 /*
563 * Power On, Reset, or Bus Device Reset, just retry.
564 */
565 return NEEDS_RETRY;
566 break;
567 }
568 /* success just means we do not care what scsi-ml does */
569 return SCSI_RETURN_NOT_HANDLED;
570}
571
572static const struct {
573 char *vendor;
574 char *model;
575} rdac_dev_list[] = {
576 {"IBM", "1722"},
577 {"IBM", "1724"},
578 {"IBM", "1726"},
579 {"IBM", "1742"},
580 {"IBM", "1814"},
581 {"IBM", "1815"},
582 {"IBM", "1818"},
583 {"IBM", "3526"},
584 {"SGI", "TP9400"},
585 {"SGI", "TP9500"},
586 {"SGI", "IS"},
587 {"STK", "OPENstorage D280"},
588 {"SUN", "CSM200_R"},
589 {"SUN", "LCSM100_F"},
590 {NULL, NULL},
591};
592
593static int rdac_bus_notify(struct notifier_block *, unsigned long, void *);
594
595static struct scsi_device_handler rdac_dh = {
596 .name = RDAC_NAME,
597 .module = THIS_MODULE,
598 .nb.notifier_call = rdac_bus_notify,
599 .prep_fn = rdac_prep_fn,
600 .check_sense = rdac_check_sense,
601 .activate = rdac_activate,
602};
603
604/*
605 * TODO: need some interface so we can set trespass values
606 */
607static int rdac_bus_notify(struct notifier_block *nb,
608 unsigned long action, void *data)
609{
610 struct device *dev = data;
611 struct scsi_device *sdev = to_scsi_device(dev);
612 struct scsi_dh_data *scsi_dh_data;
613 struct rdac_dh_data *h;
614 int i, found = 0;
615 unsigned long flags;
616
617 if (action == BUS_NOTIFY_ADD_DEVICE) {
618 for (i = 0; rdac_dev_list[i].vendor; i++) {
619 if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor,
620 strlen(rdac_dev_list[i].vendor)) &&
621 !strncmp(sdev->model, rdac_dev_list[i].model,
622 strlen(rdac_dev_list[i].model))) {
623 found = 1;
624 break;
625 }
626 }
627 if (!found)
628 goto out;
629
630 scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
631 + sizeof(*h) , GFP_KERNEL);
632 if (!scsi_dh_data) {
633 sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
634 RDAC_NAME);
635 goto out;
636 }
637
638 scsi_dh_data->scsi_dh = &rdac_dh;
639 h = (struct rdac_dh_data *) scsi_dh_data->buf;
640 h->lun = UNINITIALIZED_LUN;
641 h->state = RDAC_STATE_ACTIVE;
642 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
643 sdev->scsi_dh_data = scsi_dh_data;
644 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
645 try_module_get(THIS_MODULE);
646
647 sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", RDAC_NAME);
648
649 } else if (action == BUS_NOTIFY_DEL_DEVICE) {
650 if (sdev->scsi_dh_data == NULL ||
651 sdev->scsi_dh_data->scsi_dh != &rdac_dh)
652 goto out;
653
654 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
655 scsi_dh_data = sdev->scsi_dh_data;
656 sdev->scsi_dh_data = NULL;
657 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
658
659 h = (struct rdac_dh_data *) scsi_dh_data->buf;
660 if (h->ctlr)
661 kref_put(&h->ctlr->kref, release_controller);
662 kfree(scsi_dh_data);
663 module_put(THIS_MODULE);
664 sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n", RDAC_NAME);
665 }
666
667out:
668 return 0;
669}
670
671static int __init rdac_init(void)
672{
673 int r;
674
675 r = scsi_register_device_handler(&rdac_dh);
676 if (r != 0)
677 printk(KERN_ERR "Failed to register scsi device handler.");
678 return r;
679}
680
681static void __exit rdac_exit(void)
682{
683 scsi_unregister_device_handler(&rdac_dh);
684}
685
686module_init(rdac_init);
687module_exit(rdac_exit);
688
689MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
690MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
691MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 07:07:48 -0500