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1da177e4 LT |
1 | /* |
2 | * hosts.c Copyright (C) 1992 Drew Eckhardt | |
3 | * Copyright (C) 1993, 1994, 1995 Eric Youngdale | |
4 | * Copyright (C) 2002-2003 Christoph Hellwig | |
5 | * | |
6 | * mid to lowlevel SCSI driver interface | |
7 | * Initial versions: Drew Eckhardt | |
8 | * Subsequent revisions: Eric Youngdale | |
9 | * | |
10 | * <drew@colorado.edu> | |
11 | * | |
12 | * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli | |
13 | * Added QLOGIC QLA1280 SCSI controller kernel host support. | |
14 | * August 4, 1999 Fred Lewis, Intel DuPont | |
15 | * | |
16 | * Updated to reflect the new initialization scheme for the higher | |
17 | * level of scsi drivers (sd/sr/st) | |
18 | * September 17, 2000 Torben Mathiasen <tmm@image.dk> | |
19 | * | |
20 | * Restructured scsi_host lists and associated functions. | |
21 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/blkdev.h> | |
26 | #include <linux/kernel.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
c5478def | 28 | #include <linux/kthread.h> |
1da177e4 LT |
29 | #include <linux/string.h> |
30 | #include <linux/mm.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/completion.h> | |
33 | #include <linux/transport_class.h> | |
d052d1be | 34 | #include <linux/platform_device.h> |
1da177e4 LT |
35 | |
36 | #include <scsi/scsi_device.h> | |
37 | #include <scsi/scsi_host.h> | |
38 | #include <scsi/scsi_transport.h> | |
39 | ||
40 | #include "scsi_priv.h" | |
41 | #include "scsi_logging.h" | |
42 | ||
43 | ||
30c9afa6 | 44 | static atomic_t scsi_host_next_hn; /* host_no for next new host */ |
1da177e4 LT |
45 | |
46 | ||
ee959b00 | 47 | static void scsi_host_cls_release(struct device *dev) |
1da177e4 | 48 | { |
ee959b00 | 49 | put_device(&class_to_shost(dev)->shost_gendev); |
1da177e4 LT |
50 | } |
51 | ||
52 | static struct class shost_class = { | |
53 | .name = "scsi_host", | |
ee959b00 | 54 | .dev_release = scsi_host_cls_release, |
1da177e4 LT |
55 | }; |
56 | ||
d3301874 | 57 | /** |
eb44820c | 58 | * scsi_host_set_state - Take the given host through the host state model. |
d3301874 MA |
59 | * @shost: scsi host to change the state of. |
60 | * @state: state to change to. | |
61 | * | |
62 | * Returns zero if unsuccessful or an error if the requested | |
63 | * transition is illegal. | |
64 | **/ | |
65 | int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state) | |
66 | { | |
67 | enum scsi_host_state oldstate = shost->shost_state; | |
68 | ||
69 | if (state == oldstate) | |
70 | return 0; | |
71 | ||
72 | switch (state) { | |
73 | case SHOST_CREATED: | |
74 | /* There are no legal states that come back to | |
75 | * created. This is the manually initialised start | |
76 | * state */ | |
77 | goto illegal; | |
78 | ||
79 | case SHOST_RUNNING: | |
80 | switch (oldstate) { | |
81 | case SHOST_CREATED: | |
82 | case SHOST_RECOVERY: | |
83 | break; | |
84 | default: | |
85 | goto illegal; | |
86 | } | |
87 | break; | |
88 | ||
89 | case SHOST_RECOVERY: | |
90 | switch (oldstate) { | |
91 | case SHOST_RUNNING: | |
92 | break; | |
93 | default: | |
94 | goto illegal; | |
95 | } | |
96 | break; | |
97 | ||
98 | case SHOST_CANCEL: | |
99 | switch (oldstate) { | |
100 | case SHOST_CREATED: | |
101 | case SHOST_RUNNING: | |
939647ee | 102 | case SHOST_CANCEL_RECOVERY: |
d3301874 MA |
103 | break; |
104 | default: | |
105 | goto illegal; | |
106 | } | |
107 | break; | |
108 | ||
109 | case SHOST_DEL: | |
110 | switch (oldstate) { | |
111 | case SHOST_CANCEL: | |
939647ee | 112 | case SHOST_DEL_RECOVERY: |
d3301874 MA |
113 | break; |
114 | default: | |
115 | goto illegal; | |
116 | } | |
117 | break; | |
118 | ||
939647ee JB |
119 | case SHOST_CANCEL_RECOVERY: |
120 | switch (oldstate) { | |
121 | case SHOST_CANCEL: | |
122 | case SHOST_RECOVERY: | |
123 | break; | |
124 | default: | |
125 | goto illegal; | |
126 | } | |
127 | break; | |
128 | ||
129 | case SHOST_DEL_RECOVERY: | |
130 | switch (oldstate) { | |
131 | case SHOST_CANCEL_RECOVERY: | |
132 | break; | |
133 | default: | |
134 | goto illegal; | |
135 | } | |
136 | break; | |
d3301874 MA |
137 | } |
138 | shost->shost_state = state; | |
139 | return 0; | |
140 | ||
141 | illegal: | |
142 | SCSI_LOG_ERROR_RECOVERY(1, | |
9ccfc756 JB |
143 | shost_printk(KERN_ERR, shost, |
144 | "Illegal host state transition" | |
145 | "%s->%s\n", | |
146 | scsi_host_state_name(oldstate), | |
147 | scsi_host_state_name(state))); | |
d3301874 MA |
148 | return -EINVAL; |
149 | } | |
150 | EXPORT_SYMBOL(scsi_host_set_state); | |
151 | ||
1da177e4 LT |
152 | /** |
153 | * scsi_remove_host - remove a scsi host | |
154 | * @shost: a pointer to a scsi host to remove | |
155 | **/ | |
156 | void scsi_remove_host(struct Scsi_Host *shost) | |
157 | { | |
939647ee | 158 | unsigned long flags; |
0b950672 | 159 | mutex_lock(&shost->scan_mutex); |
939647ee JB |
160 | spin_lock_irqsave(shost->host_lock, flags); |
161 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
162 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) { | |
163 | spin_unlock_irqrestore(shost->host_lock, flags); | |
0b950672 | 164 | mutex_unlock(&shost->scan_mutex); |
939647ee JB |
165 | return; |
166 | } | |
167 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 | 168 | scsi_forget_host(shost); |
4e46bf89 | 169 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
170 | scsi_proc_host_rm(shost); |
171 | ||
939647ee JB |
172 | spin_lock_irqsave(shost->host_lock, flags); |
173 | if (scsi_host_set_state(shost, SHOST_DEL)) | |
174 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY)); | |
175 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
176 | |
177 | transport_unregister_device(&shost->shost_gendev); | |
ee959b00 | 178 | device_unregister(&shost->shost_dev); |
1da177e4 LT |
179 | device_del(&shost->shost_gendev); |
180 | } | |
181 | EXPORT_SYMBOL(scsi_remove_host); | |
182 | ||
183 | /** | |
d139b9bd | 184 | * scsi_add_host_with_dma - add a scsi host with dma device |
1da177e4 LT |
185 | * @shost: scsi host pointer to add |
186 | * @dev: a struct device of type scsi class | |
d139b9bd JB |
187 | * @dma_dev: dma device for the host |
188 | * | |
189 | * Note: You rarely need to worry about this unless you're in a | |
190 | * virtualised host environments, so use the simpler scsi_add_host() | |
191 | * function instead. | |
1da177e4 LT |
192 | * |
193 | * Return value: | |
194 | * 0 on success / != 0 for error | |
195 | **/ | |
d139b9bd JB |
196 | int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, |
197 | struct device *dma_dev) | |
1da177e4 LT |
198 | { |
199 | struct scsi_host_template *sht = shost->hostt; | |
200 | int error = -EINVAL; | |
201 | ||
202 | printk(KERN_INFO "scsi%d : %s\n", shost->host_no, | |
203 | sht->info ? sht->info(shost) : sht->name); | |
204 | ||
205 | if (!shost->can_queue) { | |
206 | printk(KERN_ERR "%s: can_queue = 0 no longer supported\n", | |
207 | sht->name); | |
542bd137 | 208 | goto fail; |
1da177e4 LT |
209 | } |
210 | ||
542bd137 JB |
211 | error = scsi_setup_command_freelist(shost); |
212 | if (error) | |
213 | goto fail; | |
214 | ||
1da177e4 LT |
215 | if (!shost->shost_gendev.parent) |
216 | shost->shost_gendev.parent = dev ? dev : &platform_bus; | |
d139b9bd | 217 | shost->dma_dev = dma_dev; |
1da177e4 | 218 | |
4cb077d9 RW |
219 | device_enable_async_suspend(&shost->shost_gendev); |
220 | ||
1da177e4 LT |
221 | error = device_add(&shost->shost_gendev); |
222 | if (error) | |
223 | goto out; | |
224 | ||
d3301874 | 225 | scsi_host_set_state(shost, SHOST_RUNNING); |
1da177e4 LT |
226 | get_device(shost->shost_gendev.parent); |
227 | ||
4cb077d9 RW |
228 | device_enable_async_suspend(&shost->shost_dev); |
229 | ||
ee959b00 | 230 | error = device_add(&shost->shost_dev); |
1da177e4 LT |
231 | if (error) |
232 | goto out_del_gendev; | |
233 | ||
234 | get_device(&shost->shost_gendev); | |
235 | ||
77cca462 JS |
236 | if (shost->transportt->host_size) { |
237 | shost->shost_data = kzalloc(shost->transportt->host_size, | |
238 | GFP_KERNEL); | |
239 | if (shost->shost_data == NULL) { | |
240 | error = -ENOMEM; | |
ee959b00 | 241 | goto out_del_dev; |
77cca462 JS |
242 | } |
243 | } | |
1da177e4 LT |
244 | |
245 | if (shost->transportt->create_work_queue) { | |
aab0de24 KS |
246 | snprintf(shost->work_q_name, sizeof(shost->work_q_name), |
247 | "scsi_wq_%d", shost->host_no); | |
1da177e4 LT |
248 | shost->work_q = create_singlethread_workqueue( |
249 | shost->work_q_name); | |
77cca462 JS |
250 | if (!shost->work_q) { |
251 | error = -EINVAL; | |
1da177e4 | 252 | goto out_free_shost_data; |
77cca462 | 253 | } |
1da177e4 LT |
254 | } |
255 | ||
256 | error = scsi_sysfs_add_host(shost); | |
257 | if (error) | |
258 | goto out_destroy_host; | |
259 | ||
260 | scsi_proc_host_add(shost); | |
261 | return error; | |
262 | ||
263 | out_destroy_host: | |
264 | if (shost->work_q) | |
265 | destroy_workqueue(shost->work_q); | |
266 | out_free_shost_data: | |
267 | kfree(shost->shost_data); | |
ee959b00 TJ |
268 | out_del_dev: |
269 | device_del(&shost->shost_dev); | |
1da177e4 LT |
270 | out_del_gendev: |
271 | device_del(&shost->shost_gendev); | |
272 | out: | |
542bd137 JB |
273 | scsi_destroy_command_freelist(shost); |
274 | fail: | |
1da177e4 LT |
275 | return error; |
276 | } | |
d139b9bd | 277 | EXPORT_SYMBOL(scsi_add_host_with_dma); |
1da177e4 LT |
278 | |
279 | static void scsi_host_dev_release(struct device *dev) | |
280 | { | |
281 | struct Scsi_Host *shost = dev_to_shost(dev); | |
282 | struct device *parent = dev->parent; | |
283 | ||
77c01976 AS |
284 | scsi_proc_hostdir_rm(shost->hostt); |
285 | ||
c5478def CH |
286 | if (shost->ehandler) |
287 | kthread_stop(shost->ehandler); | |
1da177e4 LT |
288 | if (shost->work_q) |
289 | destroy_workqueue(shost->work_q); | |
b58d9154 FT |
290 | if (shost->uspace_req_q) { |
291 | kfree(shost->uspace_req_q->queuedata); | |
292 | scsi_free_queue(shost->uspace_req_q); | |
293 | } | |
1da177e4 | 294 | |
1da177e4 | 295 | scsi_destroy_command_freelist(shost); |
86e33a29 JB |
296 | if (shost->bqt) |
297 | blk_free_tags(shost->bqt); | |
298 | ||
1da177e4 LT |
299 | kfree(shost->shost_data); |
300 | ||
1da177e4 LT |
301 | if (parent) |
302 | put_device(parent); | |
303 | kfree(shost); | |
304 | } | |
305 | ||
453cd0f3 | 306 | static struct device_type scsi_host_type = { |
b0ed4336 HR |
307 | .name = "scsi_host", |
308 | .release = scsi_host_dev_release, | |
309 | }; | |
310 | ||
1da177e4 LT |
311 | /** |
312 | * scsi_host_alloc - register a scsi host adapter instance. | |
313 | * @sht: pointer to scsi host template | |
314 | * @privsize: extra bytes to allocate for driver | |
315 | * | |
316 | * Note: | |
317 | * Allocate a new Scsi_Host and perform basic initialization. | |
318 | * The host is not published to the scsi midlayer until scsi_add_host | |
319 | * is called. | |
320 | * | |
321 | * Return value: | |
322 | * Pointer to a new Scsi_Host | |
323 | **/ | |
324 | struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) | |
325 | { | |
326 | struct Scsi_Host *shost; | |
c53033f6 AV |
327 | gfp_t gfp_mask = GFP_KERNEL; |
328 | int rval; | |
1da177e4 LT |
329 | |
330 | if (sht->unchecked_isa_dma && privsize) | |
331 | gfp_mask |= __GFP_DMA; | |
332 | ||
24669f75 | 333 | shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask); |
1da177e4 LT |
334 | if (!shost) |
335 | return NULL; | |
1da177e4 | 336 | |
4f777ed2 CH |
337 | shost->host_lock = &shost->default_lock; |
338 | spin_lock_init(shost->host_lock); | |
d3301874 | 339 | shost->shost_state = SHOST_CREATED; |
1da177e4 LT |
340 | INIT_LIST_HEAD(&shost->__devices); |
341 | INIT_LIST_HEAD(&shost->__targets); | |
342 | INIT_LIST_HEAD(&shost->eh_cmd_q); | |
343 | INIT_LIST_HEAD(&shost->starved_list); | |
344 | init_waitqueue_head(&shost->host_wait); | |
345 | ||
0b950672 | 346 | mutex_init(&shost->scan_mutex); |
1da177e4 | 347 | |
30c9afa6 JE |
348 | /* |
349 | * subtract one because we increment first then return, but we need to | |
350 | * know what the next host number was before increment | |
351 | */ | |
352 | shost->host_no = atomic_inc_return(&scsi_host_next_hn) - 1; | |
1da177e4 LT |
353 | shost->dma_channel = 0xff; |
354 | ||
355 | /* These three are default values which can be overridden */ | |
356 | shost->max_channel = 0; | |
357 | shost->max_id = 8; | |
358 | shost->max_lun = 8; | |
359 | ||
360 | /* Give each shost a default transportt */ | |
361 | shost->transportt = &blank_transport_template; | |
362 | ||
363 | /* | |
364 | * All drivers right now should be able to handle 12 byte | |
365 | * commands. Every so often there are requests for 16 byte | |
366 | * commands, but individual low-level drivers need to certify that | |
367 | * they actually do something sensible with such commands. | |
368 | */ | |
369 | shost->max_cmd_len = 12; | |
370 | shost->hostt = sht; | |
371 | shost->this_id = sht->this_id; | |
372 | shost->can_queue = sht->can_queue; | |
373 | shost->sg_tablesize = sht->sg_tablesize; | |
374 | shost->cmd_per_lun = sht->cmd_per_lun; | |
375 | shost->unchecked_isa_dma = sht->unchecked_isa_dma; | |
376 | shost->use_clustering = sht->use_clustering; | |
1da177e4 LT |
377 | shost->ordered_tag = sht->ordered_tag; |
378 | ||
7a39ac3f JB |
379 | if (sht->supported_mode == MODE_UNKNOWN) |
380 | /* means we didn't set it ... default to INITIATOR */ | |
381 | shost->active_mode = MODE_INITIATOR; | |
382 | else | |
383 | shost->active_mode = sht->supported_mode; | |
384 | ||
1da177e4 LT |
385 | if (sht->max_host_blocked) |
386 | shost->max_host_blocked = sht->max_host_blocked; | |
387 | else | |
388 | shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED; | |
389 | ||
390 | /* | |
391 | * If the driver imposes no hard sector transfer limit, start at | |
392 | * machine infinity initially. | |
393 | */ | |
394 | if (sht->max_sectors) | |
395 | shost->max_sectors = sht->max_sectors; | |
396 | else | |
397 | shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS; | |
398 | ||
399 | /* | |
400 | * assume a 4GB boundary, if not set | |
401 | */ | |
402 | if (sht->dma_boundary) | |
403 | shost->dma_boundary = sht->dma_boundary; | |
404 | else | |
405 | shost->dma_boundary = 0xffffffff; | |
406 | ||
1da177e4 | 407 | device_initialize(&shost->shost_gendev); |
71610f55 | 408 | dev_set_name(&shost->shost_gendev, "host%d", shost->host_no); |
b0ed4336 HR |
409 | #ifndef CONFIG_SYSFS_DEPRECATED |
410 | shost->shost_gendev.bus = &scsi_bus_type; | |
411 | #endif | |
412 | shost->shost_gendev.type = &scsi_host_type; | |
1da177e4 | 413 | |
ee959b00 TJ |
414 | device_initialize(&shost->shost_dev); |
415 | shost->shost_dev.parent = &shost->shost_gendev; | |
416 | shost->shost_dev.class = &shost_class; | |
71610f55 | 417 | dev_set_name(&shost->shost_dev, "host%d", shost->host_no); |
f7120a4f | 418 | shost->shost_dev.groups = scsi_sysfs_shost_attr_groups; |
1da177e4 | 419 | |
c5478def CH |
420 | shost->ehandler = kthread_run(scsi_error_handler, shost, |
421 | "scsi_eh_%d", shost->host_no); | |
422 | if (IS_ERR(shost->ehandler)) { | |
423 | rval = PTR_ERR(shost->ehandler); | |
542bd137 | 424 | goto fail_kfree; |
c5478def | 425 | } |
1da177e4 LT |
426 | |
427 | scsi_proc_hostdir_add(shost->hostt); | |
428 | return shost; | |
429 | ||
1da177e4 LT |
430 | fail_kfree: |
431 | kfree(shost); | |
432 | return NULL; | |
433 | } | |
434 | EXPORT_SYMBOL(scsi_host_alloc); | |
435 | ||
436 | struct Scsi_Host *scsi_register(struct scsi_host_template *sht, int privsize) | |
437 | { | |
438 | struct Scsi_Host *shost = scsi_host_alloc(sht, privsize); | |
439 | ||
440 | if (!sht->detect) { | |
441 | printk(KERN_WARNING "scsi_register() called on new-style " | |
442 | "template for driver %s\n", sht->name); | |
443 | dump_stack(); | |
444 | } | |
445 | ||
446 | if (shost) | |
447 | list_add_tail(&shost->sht_legacy_list, &sht->legacy_hosts); | |
448 | return shost; | |
449 | } | |
450 | EXPORT_SYMBOL(scsi_register); | |
451 | ||
452 | void scsi_unregister(struct Scsi_Host *shost) | |
453 | { | |
454 | list_del(&shost->sht_legacy_list); | |
455 | scsi_host_put(shost); | |
456 | } | |
457 | EXPORT_SYMBOL(scsi_unregister); | |
458 | ||
ee959b00 | 459 | static int __scsi_host_match(struct device *dev, void *data) |
9c770108 DY |
460 | { |
461 | struct Scsi_Host *p; | |
462 | unsigned short *hostnum = (unsigned short *)data; | |
463 | ||
ee959b00 | 464 | p = class_to_shost(dev); |
9c770108 DY |
465 | return p->host_no == *hostnum; |
466 | } | |
467 | ||
1da177e4 LT |
468 | /** |
469 | * scsi_host_lookup - get a reference to a Scsi_Host by host no | |
1da177e4 LT |
470 | * @hostnum: host number to locate |
471 | * | |
472 | * Return value: | |
473 | * A pointer to located Scsi_Host or NULL. | |
3ed78972 MC |
474 | * |
475 | * The caller must do a scsi_host_put() to drop the reference | |
476 | * that scsi_host_get() took. The put_device() below dropped | |
477 | * the reference from class_find_device(). | |
1da177e4 LT |
478 | **/ |
479 | struct Scsi_Host *scsi_host_lookup(unsigned short hostnum) | |
480 | { | |
ee959b00 | 481 | struct device *cdev; |
315cb0ad | 482 | struct Scsi_Host *shost = NULL; |
1da177e4 | 483 | |
695794ae GKH |
484 | cdev = class_find_device(&shost_class, NULL, &hostnum, |
485 | __scsi_host_match); | |
3ed78972 | 486 | if (cdev) { |
9c770108 | 487 | shost = scsi_host_get(class_to_shost(cdev)); |
3ed78972 MC |
488 | put_device(cdev); |
489 | } | |
1da177e4 LT |
490 | return shost; |
491 | } | |
492 | EXPORT_SYMBOL(scsi_host_lookup); | |
493 | ||
494 | /** | |
495 | * scsi_host_get - inc a Scsi_Host ref count | |
496 | * @shost: Pointer to Scsi_Host to inc. | |
497 | **/ | |
498 | struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost) | |
499 | { | |
d3301874 | 500 | if ((shost->shost_state == SHOST_DEL) || |
1da177e4 LT |
501 | !get_device(&shost->shost_gendev)) |
502 | return NULL; | |
503 | return shost; | |
504 | } | |
505 | EXPORT_SYMBOL(scsi_host_get); | |
506 | ||
507 | /** | |
508 | * scsi_host_put - dec a Scsi_Host ref count | |
509 | * @shost: Pointer to Scsi_Host to dec. | |
510 | **/ | |
511 | void scsi_host_put(struct Scsi_Host *shost) | |
512 | { | |
513 | put_device(&shost->shost_gendev); | |
514 | } | |
515 | EXPORT_SYMBOL(scsi_host_put); | |
516 | ||
517 | int scsi_init_hosts(void) | |
518 | { | |
519 | return class_register(&shost_class); | |
520 | } | |
521 | ||
522 | void scsi_exit_hosts(void) | |
523 | { | |
524 | class_unregister(&shost_class); | |
525 | } | |
526 | ||
527 | int scsi_is_host_device(const struct device *dev) | |
528 | { | |
b0ed4336 | 529 | return dev->type == &scsi_host_type; |
1da177e4 LT |
530 | } |
531 | EXPORT_SYMBOL(scsi_is_host_device); | |
532 | ||
533 | /** | |
534 | * scsi_queue_work - Queue work to the Scsi_Host workqueue. | |
535 | * @shost: Pointer to Scsi_Host. | |
536 | * @work: Work to queue for execution. | |
537 | * | |
538 | * Return value: | |
dd7e2f22 MR |
539 | * 1 - work queued for execution |
540 | * 0 - work is already queued | |
541 | * -EINVAL - work queue doesn't exist | |
1da177e4 LT |
542 | **/ |
543 | int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work) | |
544 | { | |
545 | if (unlikely(!shost->work_q)) { | |
546 | printk(KERN_ERR | |
547 | "ERROR: Scsi host '%s' attempted to queue scsi-work, " | |
548 | "when no workqueue created.\n", shost->hostt->name); | |
549 | dump_stack(); | |
550 | ||
551 | return -EINVAL; | |
552 | } | |
553 | ||
554 | return queue_work(shost->work_q, work); | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(scsi_queue_work); | |
557 | ||
558 | /** | |
559 | * scsi_flush_work - Flush a Scsi_Host's workqueue. | |
560 | * @shost: Pointer to Scsi_Host. | |
561 | **/ | |
562 | void scsi_flush_work(struct Scsi_Host *shost) | |
563 | { | |
564 | if (!shost->work_q) { | |
565 | printk(KERN_ERR | |
566 | "ERROR: Scsi host '%s' attempted to flush scsi-work, " | |
567 | "when no workqueue created.\n", shost->hostt->name); | |
568 | dump_stack(); | |
569 | return; | |
570 | } | |
571 | ||
572 | flush_workqueue(shost->work_q); | |
573 | } | |
574 | EXPORT_SYMBOL_GPL(scsi_flush_work); |