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spi-topcliff-pch: add recovery processing in case wait-event timeout
[zen-stable.git] / drivers / scsi / device_handler / scsi_dh_emc.c
blobe1c8be06de9de2f50dd608f0ec27f7bf81617adb
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 <linux/module.h>
25 #include <scsi/scsi.h>
26 #include <scsi/scsi_eh.h>
27 #include <scsi/scsi_dh.h>
28 #include <scsi/scsi_device.h>
29
30 #define CLARIION_NAME "emc"
31
32 #define CLARIION_TRESPASS_PAGE 0x22
33 #define CLARIION_BUFFER_SIZE 0xFC
34 #define CLARIION_TIMEOUT (60 * HZ)
35 #define CLARIION_RETRIES 3
36 #define CLARIION_UNBOUND_LU -1
37 #define CLARIION_SP_A 0
38 #define CLARIION_SP_B 1
39
40 /* Flags */
41 #define CLARIION_SHORT_TRESPASS 1
42 #define CLARIION_HONOR_RESERVATIONS 2
43
44 /* LUN states */
45 #define CLARIION_LUN_UNINITIALIZED -1
46 #define CLARIION_LUN_UNBOUND 0
47 #define CLARIION_LUN_BOUND 1
48 #define CLARIION_LUN_OWNED 2
49
50 static unsigned char long_trespass[] = {
51 0, 0, 0, 0, 0, 0, 0, 0,
52 CLARIION_TRESPASS_PAGE, /* Page code */
53 0x09, /* Page length - 2 */
54 0x01, /* Trespass code */
55 0xff, 0xff, /* Trespass target */
56 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
57 };
58
59 static unsigned char short_trespass[] = {
60 0, 0, 0, 0,
61 CLARIION_TRESPASS_PAGE, /* Page code */
62 0x02, /* Page length - 2 */
63 0x01, /* Trespass code */
64 0xff, /* Trespass target */
65 };
66
67 static const char * lun_state[] =
68 {
69 "not bound",
70 "bound",
71 "owned",
72 };
73
74 struct clariion_dh_data {
75 /*
76 * Flags:
77 * CLARIION_SHORT_TRESPASS
78 * Use short trespass command (FC-series) or the long version
79 * (default for AX/CX CLARiiON arrays).
80 *
81 * CLARIION_HONOR_RESERVATIONS
82 * Whether or not (default) to honor SCSI reservations when
83 * initiating a switch-over.
84 */
85 unsigned flags;
86 /*
87 * I/O buffer for both MODE_SELECT and INQUIRY commands.
88 */
89 unsigned char buffer[CLARIION_BUFFER_SIZE];
90 /*
91 * SCSI sense buffer for commands -- assumes serial issuance
92 * and completion sequence of all commands for same multipath.
93 */
94 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
95 unsigned int senselen;
96 /*
97 * LUN state
98 */
99 int lun_state;
100 /*
101 * SP Port number
102 */
103 int port;
104 /*
105 * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
106 * path's mapped LUN
107 */
108 int default_sp;
109 /*
110 * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
111 * path's mapped LUN
112 */
113 int current_sp;
114 };
115
116 static inline struct clariion_dh_data
117 *get_clariion_data(struct scsi_device *sdev)
118 {
119 struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
120 BUG_ON(scsi_dh_data == NULL);
121 return ((struct clariion_dh_data *) scsi_dh_data->buf);
122 }
123
124 /*
125 * Parse MODE_SELECT cmd reply.
126 */
127 static int trespass_endio(struct scsi_device *sdev, char *sense)
128 {
129 int err = SCSI_DH_IO;
130 struct scsi_sense_hdr sshdr;
131
132 if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
133 sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
134 "0x%2x, 0x%2x while sending CLARiiON trespass "
135 "command.\n", CLARIION_NAME, sshdr.sense_key,
136 sshdr.asc, sshdr.ascq);
137
138 if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
139 (sshdr.ascq == 0x00)) {
140 /*
141 * Array based copy in progress -- do not send
142 * mode_select or copy will be aborted mid-stream.
143 */
144 sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
145 "progress while sending CLARiiON trespass "
146 "command.\n", CLARIION_NAME);
147 err = SCSI_DH_DEV_TEMP_BUSY;
148 } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
149 (sshdr.ascq == 0x03)) {
150 /*
151 * LUN Not Ready - Manual Intervention Required
152 * indicates in-progress ucode upgrade (NDU).
153 */
154 sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
155 "ucode upgrade NDU operation while sending "
156 "CLARiiON trespass command.\n", CLARIION_NAME);
157 err = SCSI_DH_DEV_TEMP_BUSY;
158 } else
159 err = SCSI_DH_DEV_FAILED;
160 } else {
161 sdev_printk(KERN_INFO, sdev,
162 "%s: failed to send MODE SELECT, no sense available\n",
163 CLARIION_NAME);
164 }
165 return err;
166 }
167
168 static int parse_sp_info_reply(struct scsi_device *sdev,
169 struct clariion_dh_data *csdev)
170 {
171 int err = SCSI_DH_OK;
172
173 /* check for in-progress ucode upgrade (NDU) */
174 if (csdev->buffer[48] != 0) {
175 sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
176 "ucode upgrade NDU operation while finding "
177 "current active SP.", CLARIION_NAME);
178 err = SCSI_DH_DEV_TEMP_BUSY;
179 goto out;
180 }
181 if (csdev->buffer[4] > 2) {
182 /* Invalid buffer format */
183 sdev_printk(KERN_NOTICE, sdev,
184 "%s: invalid VPD page 0xC0 format\n",
185 CLARIION_NAME);
186 err = SCSI_DH_NOSYS;
187 goto out;
188 }
189 switch (csdev->buffer[28] & 0x0f) {
190 case 6:
191 sdev_printk(KERN_NOTICE, sdev,
192 "%s: ALUA failover mode detected\n",
193 CLARIION_NAME);
194 break;
195 case 4:
196 /* Linux failover */
197 break;
198 default:
199 sdev_printk(KERN_WARNING, sdev,
200 "%s: Invalid failover mode %d\n",
201 CLARIION_NAME, csdev->buffer[28] & 0x0f);
202 err = SCSI_DH_NOSYS;
203 goto out;
204 }
205
206 csdev->default_sp = csdev->buffer[5];
207 csdev->lun_state = csdev->buffer[4];
208 csdev->current_sp = csdev->buffer[8];
209 csdev->port = csdev->buffer[7];
210
211 out:
212 return err;
213 }
214
215 #define emc_default_str "FC (Legacy)"
216
217 static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
218 {
219 unsigned char len = buffer[4] + 5;
220 char *sp_model = NULL;
221 unsigned char sp_len, serial_len;
222
223 if (len < 160) {
224 sdev_printk(KERN_WARNING, sdev,
225 "%s: Invalid information section length %d\n",
226 CLARIION_NAME, len);
227 /* Check for old FC arrays */
228 if (!strncmp(buffer + 8, "DGC", 3)) {
229 /* Old FC array, not supporting extended information */
230 sp_model = emc_default_str;
231 }
232 goto out;
233 }
234
235 /*
236 * Parse extended information for SP model number
237 */
238 serial_len = buffer[160];
239 if (serial_len == 0 || serial_len + 161 > len) {
240 sdev_printk(KERN_WARNING, sdev,
241 "%s: Invalid array serial number length %d\n",
242 CLARIION_NAME, serial_len);
243 goto out;
244 }
245 sp_len = buffer[99];
246 if (sp_len == 0 || serial_len + sp_len + 161 > len) {
247 sdev_printk(KERN_WARNING, sdev,
248 "%s: Invalid model number length %d\n",
249 CLARIION_NAME, sp_len);
250 goto out;
251 }
252 sp_model = &buffer[serial_len + 161];
253 /* Strip whitespace at the end */
254 while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
255 sp_len--;
256
257 sp_model[sp_len] = '\0';
258
259 out:
260 return sp_model;
261 }
262
263 /*
264 * Get block request for REQ_BLOCK_PC command issued to path. Currently
265 * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
266 *
267 * Uses data and sense buffers in hardware handler context structure and
268 * assumes serial servicing of commands, both issuance and completion.
269 */
270 static struct request *get_req(struct scsi_device *sdev, int cmd,
271 unsigned char *buffer)
272 {
273 struct request *rq;
274 int len = 0;
275
276 rq = blk_get_request(sdev->request_queue,
277 (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO);
278 if (!rq) {
279 sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
280 return NULL;
281 }
282
283 rq->cmd_len = COMMAND_SIZE(cmd);
284 rq->cmd[0] = cmd;
285
286 switch (cmd) {
287 case MODE_SELECT:
288 len = sizeof(short_trespass);
289 rq->cmd[1] = 0x10;
290 rq->cmd[4] = len;
291 break;
292 case MODE_SELECT_10:
293 len = sizeof(long_trespass);
294 rq->cmd[1] = 0x10;
295 rq->cmd[8] = len;
296 break;
297 case INQUIRY:
298 len = CLARIION_BUFFER_SIZE;
299 rq->cmd[4] = len;
300 memset(buffer, 0, len);
301 break;
302 default:
303 BUG_ON(1);
304 break;
305 }
306
307 rq->cmd_type = REQ_TYPE_BLOCK_PC;
308 rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
309 REQ_FAILFAST_DRIVER;
310 rq->timeout = CLARIION_TIMEOUT;
311 rq->retries = CLARIION_RETRIES;
312
313 if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
314 blk_put_request(rq);
315 return NULL;
316 }
317
318 return rq;
319 }
320
321 static int send_inquiry_cmd(struct scsi_device *sdev, int page,
322 struct clariion_dh_data *csdev)
323 {
324 struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
325 int err;
326
327 if (!rq)
328 return SCSI_DH_RES_TEMP_UNAVAIL;
329
330 rq->sense = csdev->sense;
331 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
332 rq->sense_len = csdev->senselen = 0;
333
334 rq->cmd[0] = INQUIRY;
335 if (page != 0) {
336 rq->cmd[1] = 1;
337 rq->cmd[2] = page;
338 }
339 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
340 if (err == -EIO) {
341 sdev_printk(KERN_INFO, sdev,
342 "%s: failed to send %s INQUIRY: %x\n",
343 CLARIION_NAME, page?"EVPD":"standard",
344 rq->errors);
345 csdev->senselen = rq->sense_len;
346 err = SCSI_DH_IO;
347 }
348
349 blk_put_request(rq);
350
351 return err;
352 }
353
354 static int send_trespass_cmd(struct scsi_device *sdev,
355 struct clariion_dh_data *csdev)
356 {
357 struct request *rq;
358 unsigned char *page22;
359 int err, len, cmd;
360
361 if (csdev->flags & CLARIION_SHORT_TRESPASS) {
362 page22 = short_trespass;
363 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
364 /* Set Honor Reservations bit */
365 page22[6] |= 0x80;
366 len = sizeof(short_trespass);
367 cmd = MODE_SELECT;
368 } else {
369 page22 = long_trespass;
370 if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
371 /* Set Honor Reservations bit */
372 page22[10] |= 0x80;
373 len = sizeof(long_trespass);
374 cmd = MODE_SELECT_10;
375 }
376 BUG_ON((len > CLARIION_BUFFER_SIZE));
377 memcpy(csdev->buffer, page22, len);
378
379 rq = get_req(sdev, cmd, csdev->buffer);
380 if (!rq)
381 return SCSI_DH_RES_TEMP_UNAVAIL;
382
383 rq->sense = csdev->sense;
384 memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
385 rq->sense_len = csdev->senselen = 0;
386
387 err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
388 if (err == -EIO) {
389 if (rq->sense_len) {
390 err = trespass_endio(sdev, csdev->sense);
391 } else {
392 sdev_printk(KERN_INFO, sdev,
393 "%s: failed to send MODE SELECT: %x\n",
394 CLARIION_NAME, rq->errors);
395 }
396 }
397
398 blk_put_request(rq);
399
400 return err;
401 }
402
403 static int clariion_check_sense(struct scsi_device *sdev,
404 struct scsi_sense_hdr *sense_hdr)
405 {
406 switch (sense_hdr->sense_key) {
407 case NOT_READY:
408 if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
409 /*
410 * LUN Not Ready - Manual Intervention Required
411 * indicates this is a passive path.
412 *
413 * FIXME: However, if this is seen and EVPD C0
414 * indicates that this is due to a NDU in
415 * progress, we should set FAIL_PATH too.
416 * This indicates we might have to do a SCSI
417 * inquiry in the end_io path. Ugh.
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 ILLEGAL_REQUEST:
425 if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
426 /*
427 * An array based copy is in progress. Do not
428 * fail the path, do not bypass to another PG,
429 * do not retry. Fail the IO immediately.
430 * (Actually this is the same conclusion as in
431 * the default handler, but lets make sure.)
432 *
433 * Can return FAILED only when we want the error
434 * recovery process to kick in.
435 */
436 return SUCCESS;
437 break;
438 case UNIT_ATTENTION:
439 if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
440 /*
441 * Unit Attention Code. This is the first IO
442 * to the new path, so just retry.
443 */
444 return ADD_TO_MLQUEUE;
445 break;
446 }
447
448 return SCSI_RETURN_NOT_HANDLED;
449 }
450
451 static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
452 {
453 struct clariion_dh_data *h = get_clariion_data(sdev);
454 int ret = BLKPREP_OK;
455
456 if (h->lun_state != CLARIION_LUN_OWNED) {
457 ret = BLKPREP_KILL;
458 req->cmd_flags |= REQ_QUIET;
459 }
460 return ret;
461
462 }
463
464 static int clariion_std_inquiry(struct scsi_device *sdev,
465 struct clariion_dh_data *csdev)
466 {
467 int err;
468 char *sp_model;
469
470 err = send_inquiry_cmd(sdev, 0, csdev);
471 if (err != SCSI_DH_OK && csdev->senselen) {
472 struct scsi_sense_hdr sshdr;
473
474 if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
475 &sshdr)) {
476 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
477 "%02x/%02x/%02x\n", CLARIION_NAME,
478 sshdr.sense_key, sshdr.asc, sshdr.ascq);
479 }
480 err = SCSI_DH_IO;
481 goto out;
482 }
483
484 sp_model = parse_sp_model(sdev, csdev->buffer);
485 if (!sp_model) {
486 err = SCSI_DH_DEV_UNSUPP;
487 goto out;
488 }
489
490 /*
491 * FC Series arrays do not support long trespass
492 */
493 if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
494 csdev->flags |= CLARIION_SHORT_TRESPASS;
495
496 sdev_printk(KERN_INFO, sdev,
497 "%s: detected Clariion %s, flags %x\n",
498 CLARIION_NAME, sp_model, csdev->flags);
499 out:
500 return err;
501 }
502
503 static int clariion_send_inquiry(struct scsi_device *sdev,
504 struct clariion_dh_data *csdev)
505 {
506 int err, retry = CLARIION_RETRIES;
507
508 retry:
509 err = send_inquiry_cmd(sdev, 0xC0, csdev);
510 if (err != SCSI_DH_OK && csdev->senselen) {
511 struct scsi_sense_hdr sshdr;
512
513 err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
514 &sshdr);
515 if (!err)
516 return SCSI_DH_IO;
517
518 err = clariion_check_sense(sdev, &sshdr);
519 if (retry > 0 && err == ADD_TO_MLQUEUE) {
520 retry--;
521 goto retry;
522 }
523 sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
524 "%02x/%02x/%02x\n", CLARIION_NAME,
525 sshdr.sense_key, sshdr.asc, sshdr.ascq);
526 err = SCSI_DH_IO;
527 } else {
528 err = parse_sp_info_reply(sdev, csdev);
529 }
530 return err;
531 }
532
533 static int clariion_activate(struct scsi_device *sdev,
534 activate_complete fn, void *data)
535 {
536 struct clariion_dh_data *csdev = get_clariion_data(sdev);
537 int result;
538
539 result = clariion_send_inquiry(sdev, csdev);
540 if (result != SCSI_DH_OK)
541 goto done;
542
543 if (csdev->lun_state == CLARIION_LUN_OWNED)
544 goto done;
545
546 result = send_trespass_cmd(sdev, csdev);
547 if (result != SCSI_DH_OK)
548 goto done;
549 sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
550 CLARIION_NAME,
551 csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
552
553 /* Update status */
554 result = clariion_send_inquiry(sdev, csdev);
555 if (result != SCSI_DH_OK)
556 goto done;
557
558 done:
559 sdev_printk(KERN_INFO, sdev,
560 "%s: at SP %c Port %d (%s, default SP %c)\n",
561 CLARIION_NAME, csdev->current_sp + 'A',
562 csdev->port, lun_state[csdev->lun_state],
563 csdev->default_sp + 'A');
564
565 if (fn)
566 fn(data, result);
567 return 0;
568 }
569 /*
570 * params - parameters in the following format
571 * "no_of_params\0param1\0param2\0param3\0...\0"
572 * for example, string for 2 parameters with value 10 and 21
573 * is specified as "2\010\021\0".
574 */
575 static int clariion_set_params(struct scsi_device *sdev, const char *params)
576 {
577 struct clariion_dh_data *csdev = get_clariion_data(sdev);
578 unsigned int hr = 0, st = 0, argc;
579 const char *p = params;
580 int result = SCSI_DH_OK;
581
582 if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
583 return -EINVAL;
584
585 while (*p++)
586 ;
587 if ((sscanf(p, "%u", &st) != 1) || (st > 1))
588 return -EINVAL;
589
590 while (*p++)
591 ;
592 if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
593 return -EINVAL;
594
595 if (st)
596 csdev->flags |= CLARIION_SHORT_TRESPASS;
597 else
598 csdev->flags &= ~CLARIION_SHORT_TRESPASS;
599
600 if (hr)
601 csdev->flags |= CLARIION_HONOR_RESERVATIONS;
602 else
603 csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
604
605 /*
606 * If this path is owned, we have to send a trespass command
607 * with the new parameters. If not, simply return. Next trespass
608 * command would use the parameters.
609 */
610 if (csdev->lun_state != CLARIION_LUN_OWNED)
611 goto done;
612
613 csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
614 result = send_trespass_cmd(sdev, csdev);
615 if (result != SCSI_DH_OK)
616 goto done;
617
618 /* Update status */
619 result = clariion_send_inquiry(sdev, csdev);
620
621 done:
622 return result;
623 }
624
625 static const struct scsi_dh_devlist clariion_dev_list[] = {
626 {"DGC", "RAID"},
627 {"DGC", "DISK"},
628 {"DGC", "VRAID"},
629 {NULL, NULL},
630 };
631
632 static bool clariion_match(struct scsi_device *sdev)
633 {
634 int i;
635
636 if (scsi_device_tpgs(sdev))
637 return false;
638
639 for (i = 0; clariion_dev_list[i].vendor; i++) {
640 if (!strncmp(sdev->vendor, clariion_dev_list[i].vendor,
641 strlen(clariion_dev_list[i].vendor)) &&
642 !strncmp(sdev->model, clariion_dev_list[i].model,
643 strlen(clariion_dev_list[i].model))) {
644 return true;
645 }
646 }
647 return false;
648 }
649
650 static int clariion_bus_attach(struct scsi_device *sdev);
651 static void clariion_bus_detach(struct scsi_device *sdev);
652
653 static struct scsi_device_handler clariion_dh = {
654 .name = CLARIION_NAME,
655 .module = THIS_MODULE,
656 .devlist = clariion_dev_list,
657 .attach = clariion_bus_attach,
658 .detach = clariion_bus_detach,
659 .check_sense = clariion_check_sense,
660 .activate = clariion_activate,
661 .prep_fn = clariion_prep_fn,
662 .set_params = clariion_set_params,
663 .match = clariion_match,
664 };
665
666 static int clariion_bus_attach(struct scsi_device *sdev)
667 {
668 struct scsi_dh_data *scsi_dh_data;
669 struct clariion_dh_data *h;
670 unsigned long flags;
671 int err;
672
673 scsi_dh_data = kzalloc(sizeof(*scsi_dh_data)
674 + sizeof(*h) , GFP_KERNEL);
675 if (!scsi_dh_data) {
676 sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
677 CLARIION_NAME);
678 return -ENOMEM;
679 }
680
681 scsi_dh_data->scsi_dh = &clariion_dh;
682 h = (struct clariion_dh_data *) scsi_dh_data->buf;
683 h->lun_state = CLARIION_LUN_UNINITIALIZED;
684 h->default_sp = CLARIION_UNBOUND_LU;
685 h->current_sp = CLARIION_UNBOUND_LU;
686
687 err = clariion_std_inquiry(sdev, h);
688 if (err != SCSI_DH_OK)
689 goto failed;
690
691 err = clariion_send_inquiry(sdev, h);
692 if (err != SCSI_DH_OK)
693 goto failed;
694
695 if (!try_module_get(THIS_MODULE))
696 goto failed;
697
698 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
699 sdev->scsi_dh_data = scsi_dh_data;
700 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
701
702 sdev_printk(KERN_INFO, sdev,
703 "%s: connected to SP %c Port %d (%s, default SP %c)\n",
704 CLARIION_NAME, h->current_sp + 'A',
705 h->port, lun_state[h->lun_state],
706 h->default_sp + 'A');
707
708 return 0;
709
710 failed:
711 kfree(scsi_dh_data);
712 sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
713 CLARIION_NAME);
714 return -EINVAL;
715 }
716
717 static void clariion_bus_detach(struct scsi_device *sdev)
718 {
719 struct scsi_dh_data *scsi_dh_data;
720 unsigned long flags;
721
722 spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
723 scsi_dh_data = sdev->scsi_dh_data;
724 sdev->scsi_dh_data = NULL;
725 spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
726
727 sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
728 CLARIION_NAME);
729
730 kfree(scsi_dh_data);
731 module_put(THIS_MODULE);
732 }
733
734 static int __init clariion_init(void)
735 {
736 int r;
737
738 r = scsi_register_device_handler(&clariion_dh);
739 if (r != 0)
740 printk(KERN_ERR "%s: Failed to register scsi device handler.",
741 CLARIION_NAME);
742 return r;
743 }
744
745 static void __exit clariion_exit(void)
746 {
747 scsi_unregister_device_handler(&clariion_dh);
748 }
749
750 module_init(clariion_init);
751 module_exit(clariion_exit);
752
753 MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
754 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
755 MODULE_LICENSE("GPL");