1 /*
2 * zfcp device driver
3 *
4 * Debug traces for zfcp.
5 *
6 * Copyright IBM Corp. 2002, 2013
7 */
8
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include <linux/module.h>
13 #include <linux/ctype.h>
14 #include <linux/slab.h>
15 #include <asm/debug.h>
16 #include "zfcp_dbf.h"
17 #include "zfcp_ext.h"
18 #include "zfcp_fc.h"
19
20 static u32 dbfsize = 4;
21
22 module_param(dbfsize, uint, 0400);
23 MODULE_PARM_DESC(dbfsize,
24 "number of pages for each debug feature area (default 4)");
25
26 static u32 dbflevel = 3;
27
28 module_param(dbflevel, uint, 0400);
29 MODULE_PARM_DESC(dbflevel,
30 "log level for each debug feature area "
31 "(default 3, range 0..6)");
32
zfcp_dbf_plen(unsigned int offset)33 static inline unsigned int zfcp_dbf_plen(unsigned int offset)
34 {
35 return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
36 }
37
38 static inline
zfcp_dbf_pl_write(struct zfcp_dbf * dbf,void * data,u16 length,char * area,u64 req_id)39 void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
40 u64 req_id)
41 {
42 struct zfcp_dbf_pay *pl = &dbf->pay_buf;
43 u16 offset = 0, rec_length;
44
45 spin_lock(&dbf->pay_lock);
46 memset(pl, 0, sizeof(*pl));
47 pl->fsf_req_id = req_id;
48 memcpy(pl->area, area, ZFCP_DBF_TAG_LEN);
49
50 while (offset < length) {
51 rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
52 (u16) (length - offset));
53 memcpy(pl->data, data + offset, rec_length);
54 debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));
55
56 offset += rec_length;
57 pl->counter++;
58 }
59
60 spin_unlock(&dbf->pay_lock);
61 }
62
63 /**
64 * zfcp_dbf_hba_fsf_res - trace event for fsf responses
65 * @tag: tag indicating which kind of unsolicited status has been received
66 * @req: request for which a response was received
67 */
zfcp_dbf_hba_fsf_res(char * tag,struct zfcp_fsf_req * req)68 void zfcp_dbf_hba_fsf_res(char *tag, struct zfcp_fsf_req *req)
69 {
70 struct zfcp_dbf *dbf = req->adapter->dbf;
71 struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
72 struct fsf_qtcb_header *q_head = &req->qtcb->header;
73 struct zfcp_dbf_hba *rec = &dbf->hba_buf;
74 unsigned long flags;
75
76 spin_lock_irqsave(&dbf->hba_lock, flags);
77 memset(rec, 0, sizeof(*rec));
78
79 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
80 rec->id = ZFCP_DBF_HBA_RES;
81 rec->fsf_req_id = req->req_id;
82 rec->fsf_req_status = req->status;
83 rec->fsf_cmd = req->fsf_command;
84 rec->fsf_seq_no = req->seq_no;
85 rec->u.res.req_issued = req->issued;
86 rec->u.res.prot_status = q_pref->prot_status;
87 rec->u.res.fsf_status = q_head->fsf_status;
88
89 memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
90 FSF_PROT_STATUS_QUAL_SIZE);
91 memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
92 FSF_STATUS_QUALIFIER_SIZE);
93
94 if (req->fsf_command != FSF_QTCB_FCP_CMND) {
95 rec->pl_len = q_head->log_length;
96 zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
97 rec->pl_len, "fsf_res", req->req_id);
98 }
99
100 debug_event(dbf->hba, 1, rec, sizeof(*rec));
101 spin_unlock_irqrestore(&dbf->hba_lock, flags);
102 }
103
104 /**
105 * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
106 * @tag: tag indicating which kind of unsolicited status has been received
107 * @req: request providing the unsolicited status
108 */
zfcp_dbf_hba_fsf_uss(char * tag,struct zfcp_fsf_req * req)109 void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
110 {
111 struct zfcp_dbf *dbf = req->adapter->dbf;
112 struct fsf_status_read_buffer *srb = req->data;
113 struct zfcp_dbf_hba *rec = &dbf->hba_buf;
114 unsigned long flags;
115
116 spin_lock_irqsave(&dbf->hba_lock, flags);
117 memset(rec, 0, sizeof(*rec));
118
119 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
120 rec->id = ZFCP_DBF_HBA_USS;
121 rec->fsf_req_id = req->req_id;
122 rec->fsf_req_status = req->status;
123 rec->fsf_cmd = req->fsf_command;
124
125 if (!srb)
126 goto log;
127
128 rec->u.uss.status_type = srb->status_type;
129 rec->u.uss.status_subtype = srb->status_subtype;
130 rec->u.uss.d_id = ntoh24(srb->d_id);
131 rec->u.uss.lun = srb->fcp_lun;
132 memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
133 sizeof(rec->u.uss.queue_designator));
134
135 /* status read buffer payload length */
136 rec->pl_len = (!srb->length) ? 0 : srb->length -
137 offsetof(struct fsf_status_read_buffer, payload);
138
139 if (rec->pl_len)
140 zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
141 "fsf_uss", req->req_id);
142 log:
143 debug_event(dbf->hba, 2, rec, sizeof(*rec));
144 spin_unlock_irqrestore(&dbf->hba_lock, flags);
145 }
146
147 /**
148 * zfcp_dbf_hba_bit_err - trace event for bit error conditions
149 * @tag: tag indicating which kind of unsolicited status has been received
150 * @req: request which caused the bit_error condition
151 */
zfcp_dbf_hba_bit_err(char * tag,struct zfcp_fsf_req * req)152 void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
153 {
154 struct zfcp_dbf *dbf = req->adapter->dbf;
155 struct zfcp_dbf_hba *rec = &dbf->hba_buf;
156 struct fsf_status_read_buffer *sr_buf = req->data;
157 unsigned long flags;
158
159 spin_lock_irqsave(&dbf->hba_lock, flags);
160 memset(rec, 0, sizeof(*rec));
161
162 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
163 rec->id = ZFCP_DBF_HBA_BIT;
164 rec->fsf_req_id = req->req_id;
165 rec->fsf_req_status = req->status;
166 rec->fsf_cmd = req->fsf_command;
167 memcpy(&rec->u.be, &sr_buf->payload.bit_error,
168 sizeof(struct fsf_bit_error_payload));
169
170 debug_event(dbf->hba, 1, rec, sizeof(*rec));
171 spin_unlock_irqrestore(&dbf->hba_lock, flags);
172 }
173
174 /**
175 * zfcp_dbf_hba_def_err - trace event for deferred error messages
176 * @adapter: pointer to struct zfcp_adapter
177 * @req_id: request id which caused the deferred error message
178 * @scount: number of sbals incl. the signaling sbal
179 * @pl: array of all involved sbals
180 */
zfcp_dbf_hba_def_err(struct zfcp_adapter * adapter,u64 req_id,u16 scount,void ** pl)181 void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
182 void **pl)
183 {
184 struct zfcp_dbf *dbf = adapter->dbf;
185 struct zfcp_dbf_pay *payload = &dbf->pay_buf;
186 unsigned long flags;
187 u16 length;
188
189 if (!pl)
190 return;
191
192 spin_lock_irqsave(&dbf->pay_lock, flags);
193 memset(payload, 0, sizeof(*payload));
194
195 memcpy(payload->area, "def_err", 7);
196 payload->fsf_req_id = req_id;
197 payload->counter = 0;
198 length = min((u16)sizeof(struct qdio_buffer),
199 (u16)ZFCP_DBF_PAY_MAX_REC);
200
201 while (payload->counter < scount && (char *)pl[payload->counter]) {
202 memcpy(payload->data, (char *)pl[payload->counter], length);
203 debug_event(dbf->pay, 1, payload, zfcp_dbf_plen(length));
204 payload->counter++;
205 }
206
207 spin_unlock_irqrestore(&dbf->pay_lock, flags);
208 }
209
210 /**
211 * zfcp_dbf_hba_basic - trace event for basic adapter events
212 * @adapter: pointer to struct zfcp_adapter
213 */
zfcp_dbf_hba_basic(char * tag,struct zfcp_adapter * adapter)214 void zfcp_dbf_hba_basic(char *tag, struct zfcp_adapter *adapter)
215 {
216 struct zfcp_dbf *dbf = adapter->dbf;
217 struct zfcp_dbf_hba *rec = &dbf->hba_buf;
218 unsigned long flags;
219
220 spin_lock_irqsave(&dbf->hba_lock, flags);
221 memset(rec, 0, sizeof(*rec));
222
223 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
224 rec->id = ZFCP_DBF_HBA_BASIC;
225
226 debug_event(dbf->hba, 1, rec, sizeof(*rec));
227 spin_unlock_irqrestore(&dbf->hba_lock, flags);
228 }
229
zfcp_dbf_set_common(struct zfcp_dbf_rec * rec,struct zfcp_adapter * adapter,struct zfcp_port * port,struct scsi_device * sdev)230 static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
231 struct zfcp_adapter *adapter,
232 struct zfcp_port *port,
233 struct scsi_device *sdev)
234 {
235 rec->adapter_status = atomic_read(&adapter->status);
236 if (port) {
237 rec->port_status = atomic_read(&port->status);
238 rec->wwpn = port->wwpn;
239 rec->d_id = port->d_id;
240 }
241 if (sdev) {
242 rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
243 rec->lun = zfcp_scsi_dev_lun(sdev);
244 }
245 }
246
247 /**
248 * zfcp_dbf_rec_trig - trace event related to triggered recovery
249 * @tag: identifier for event
250 * @adapter: adapter on which the erp_action should run
251 * @port: remote port involved in the erp_action
252 * @sdev: scsi device involved in the erp_action
253 * @want: wanted erp_action
254 * @need: required erp_action
255 *
256 * The adapter->erp_lock has to be held.
257 */
zfcp_dbf_rec_trig(char * tag,struct zfcp_adapter * adapter,struct zfcp_port * port,struct scsi_device * sdev,u8 want,u8 need)258 void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
259 struct zfcp_port *port, struct scsi_device *sdev,
260 u8 want, u8 need)
261 {
262 struct zfcp_dbf *dbf = adapter->dbf;
263 struct zfcp_dbf_rec *rec = &dbf->rec_buf;
264 struct list_head *entry;
265 unsigned long flags;
266
267 spin_lock_irqsave(&dbf->rec_lock, flags);
268 memset(rec, 0, sizeof(*rec));
269
270 rec->id = ZFCP_DBF_REC_TRIG;
271 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
272 zfcp_dbf_set_common(rec, adapter, port, sdev);
273
274 list_for_each(entry, &adapter->erp_ready_head)
275 rec->u.trig.ready++;
276
277 list_for_each(entry, &adapter->erp_running_head)
278 rec->u.trig.running++;
279
280 rec->u.trig.want = want;
281 rec->u.trig.need = need;
282
283 debug_event(dbf->rec, 1, rec, sizeof(*rec));
284 spin_unlock_irqrestore(&dbf->rec_lock, flags);
285 }
286
287
288 /**
289 * zfcp_dbf_rec_run - trace event related to running recovery
290 * @tag: identifier for event
291 * @erp: erp_action running
292 */
zfcp_dbf_rec_run(char * tag,struct zfcp_erp_action * erp)293 void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
294 {
295 struct zfcp_dbf *dbf = erp->adapter->dbf;
296 struct zfcp_dbf_rec *rec = &dbf->rec_buf;
297 unsigned long flags;
298
299 spin_lock_irqsave(&dbf->rec_lock, flags);
300 memset(rec, 0, sizeof(*rec));
301
302 rec->id = ZFCP_DBF_REC_RUN;
303 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
304 zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
305
306 rec->u.run.fsf_req_id = erp->fsf_req_id;
307 rec->u.run.rec_status = erp->status;
308 rec->u.run.rec_step = erp->step;
309 rec->u.run.rec_action = erp->action;
310
311 if (erp->sdev)
312 rec->u.run.rec_count =
313 atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
314 else if (erp->port)
315 rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
316 else
317 rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
318
319 debug_event(dbf->rec, 1, rec, sizeof(*rec));
320 spin_unlock_irqrestore(&dbf->rec_lock, flags);
321 }
322
323 static inline
zfcp_dbf_san(char * tag,struct zfcp_dbf * dbf,void * data,u8 id,u16 len,u64 req_id,u32 d_id)324 void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
325 u64 req_id, u32 d_id)
326 {
327 struct zfcp_dbf_san *rec = &dbf->san_buf;
328 u16 rec_len;
329 unsigned long flags;
330
331 spin_lock_irqsave(&dbf->san_lock, flags);
332 memset(rec, 0, sizeof(*rec));
333
334 rec->id = id;
335 rec->fsf_req_id = req_id;
336 rec->d_id = d_id;
337 rec_len = min(len, (u16)ZFCP_DBF_SAN_MAX_PAYLOAD);
338 memcpy(rec->payload, data, rec_len);
339 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
340
341 debug_event(dbf->san, 1, rec, sizeof(*rec));
342 spin_unlock_irqrestore(&dbf->san_lock, flags);
343 }
344
345 /**
346 * zfcp_dbf_san_req - trace event for issued SAN request
347 * @tag: identifier for event
348 * @fsf_req: request containing issued CT data
349 * d_id: destination ID
350 */
zfcp_dbf_san_req(char * tag,struct zfcp_fsf_req * fsf,u32 d_id)351 void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
352 {
353 struct zfcp_dbf *dbf = fsf->adapter->dbf;
354 struct zfcp_fsf_ct_els *ct_els = fsf->data;
355 u16 length;
356
357 length = (u16)(ct_els->req->length + FC_CT_HDR_LEN);
358 zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
359 fsf->req_id, d_id);
360 }
361
362 /**
363 * zfcp_dbf_san_res - trace event for received SAN request
364 * @tag: identifier for event
365 * @fsf_req: request containing issued CT data
366 */
zfcp_dbf_san_res(char * tag,struct zfcp_fsf_req * fsf)367 void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
368 {
369 struct zfcp_dbf *dbf = fsf->adapter->dbf;
370 struct zfcp_fsf_ct_els *ct_els = fsf->data;
371 u16 length;
372
373 length = (u16)(ct_els->resp->length + FC_CT_HDR_LEN);
374 zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
375 fsf->req_id, 0);
376 }
377
378 /**
379 * zfcp_dbf_san_in_els - trace event for incoming ELS
380 * @tag: identifier for event
381 * @fsf_req: request containing issued CT data
382 */
zfcp_dbf_san_in_els(char * tag,struct zfcp_fsf_req * fsf)383 void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
384 {
385 struct zfcp_dbf *dbf = fsf->adapter->dbf;
386 struct fsf_status_read_buffer *srb =
387 (struct fsf_status_read_buffer *) fsf->data;
388 u16 length;
389
390 length = (u16)(srb->length -
391 offsetof(struct fsf_status_read_buffer, payload));
392 zfcp_dbf_san(tag, dbf, srb->payload.data, ZFCP_DBF_SAN_ELS, length,
393 fsf->req_id, ntoh24(srb->d_id));
394 }
395
396 /**
397 * zfcp_dbf_scsi - trace event for scsi commands
398 * @tag: identifier for event
399 * @sc: pointer to struct scsi_cmnd
400 * @fsf: pointer to struct zfcp_fsf_req
401 */
zfcp_dbf_scsi(char * tag,struct scsi_cmnd * sc,struct zfcp_fsf_req * fsf)402 void zfcp_dbf_scsi(char *tag, struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf)
403 {
404 struct zfcp_adapter *adapter =
405 (struct zfcp_adapter *) sc->device->host->hostdata[0];
406 struct zfcp_dbf *dbf = adapter->dbf;
407 struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
408 struct fcp_resp_with_ext *fcp_rsp;
409 struct fcp_resp_rsp_info *fcp_rsp_info;
410 unsigned long flags;
411
412 spin_lock_irqsave(&dbf->scsi_lock, flags);
413 memset(rec, 0, sizeof(*rec));
414
415 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
416 rec->id = ZFCP_DBF_SCSI_CMND;
417 rec->scsi_result = sc->result;
418 rec->scsi_retries = sc->retries;
419 rec->scsi_allowed = sc->allowed;
420 rec->scsi_id = sc->device->id;
421 rec->scsi_lun = (u32)sc->device->lun;
422 rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32);
423 rec->host_scribble = (unsigned long)sc->host_scribble;
424
425 memcpy(rec->scsi_opcode, sc->cmnd,
426 min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
427
428 if (fsf) {
429 rec->fsf_req_id = fsf->req_id;
430 rec->pl_len = FCP_RESP_WITH_EXT;
431 fcp_rsp = (struct fcp_resp_with_ext *)
432 &(fsf->qtcb->bottom.io.fcp_rsp);
433 /* mandatory parts of FCP_RSP IU in this SCSI record */
434 memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
435 if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
436 fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
437 rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
438 rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_rsp_len);
439 }
440 if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
441 rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_sns_len);
442 }
443 /* complete FCP_RSP IU in associated PAYload record
444 * but only if there are optional parts
445 */
446 if (fcp_rsp->resp.fr_flags != 0)
447 zfcp_dbf_pl_write(
448 dbf, fcp_rsp,
449 /* at least one full PAY record
450 * but not beyond hardware response field
451 */
452 min_t(u16, max_t(u16, rec->pl_len,
453 ZFCP_DBF_PAY_MAX_REC),
454 FSF_FCP_RSP_SIZE),
455 "fcp_riu", fsf->req_id);
456 }
457
458 debug_event(dbf->scsi, 1, rec, sizeof(*rec));
459 spin_unlock_irqrestore(&dbf->scsi_lock, flags);
460 }
461
zfcp_dbf_reg(const char * name,int size,int rec_size)462 static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
463 {
464 struct debug_info *d;
465
466 d = debug_register(name, size, 1, rec_size);
467 if (!d)
468 return NULL;
469
470 debug_register_view(d, &debug_hex_ascii_view);
471 debug_set_level(d, dbflevel);
472
473 return d;
474 }
475
zfcp_dbf_unregister(struct zfcp_dbf * dbf)476 static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
477 {
478 if (!dbf)
479 return;
480
481 debug_unregister(dbf->scsi);
482 debug_unregister(dbf->san);
483 debug_unregister(dbf->hba);
484 debug_unregister(dbf->pay);
485 debug_unregister(dbf->rec);
486 kfree(dbf);
487 }
488
489 /**
490 * zfcp_adapter_debug_register - registers debug feature for an adapter
491 * @adapter: pointer to adapter for which debug features should be registered
492 * return: -ENOMEM on error, 0 otherwise
493 */
zfcp_dbf_adapter_register(struct zfcp_adapter * adapter)494 int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
495 {
496 char name[DEBUG_MAX_NAME_LEN];
497 struct zfcp_dbf *dbf;
498
499 dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
500 if (!dbf)
501 return -ENOMEM;
502
503 spin_lock_init(&dbf->pay_lock);
504 spin_lock_init(&dbf->hba_lock);
505 spin_lock_init(&dbf->san_lock);
506 spin_lock_init(&dbf->scsi_lock);
507 spin_lock_init(&dbf->rec_lock);
508
509 /* debug feature area which records recovery activity */
510 sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
511 dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
512 if (!dbf->rec)
513 goto err_out;
514
515 /* debug feature area which records HBA (FSF and QDIO) conditions */
516 sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
517 dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
518 if (!dbf->hba)
519 goto err_out;
520
521 /* debug feature area which records payload info */
522 sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
523 dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
524 if (!dbf->pay)
525 goto err_out;
526
527 /* debug feature area which records SAN command failures and recovery */
528 sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
529 dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
530 if (!dbf->san)
531 goto err_out;
532
533 /* debug feature area which records SCSI command failures and recovery */
534 sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
535 dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
536 if (!dbf->scsi)
537 goto err_out;
538
539 adapter->dbf = dbf;
540
541 return 0;
542 err_out:
543 zfcp_dbf_unregister(dbf);
544 return -ENOMEM;
545 }
546
547 /**
548 * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
549 * @adapter: pointer to adapter for which debug features should be unregistered
550 */
zfcp_dbf_adapter_unregister(struct zfcp_adapter * adapter)551 void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
552 {
553 struct zfcp_dbf *dbf = adapter->dbf;
554
555 adapter->dbf = NULL;
556 zfcp_dbf_unregister(dbf);
557 }
558
559