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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> |
bc4f2401 | 35 | #include <linux/pm_runtime.h> |
1da177e4 LT |
36 | |
37 | #include <scsi/scsi_device.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_transport.h> | |
40 | ||
41 | #include "scsi_priv.h" | |
42 | #include "scsi_logging.h" | |
43 | ||
44 | ||
30c9afa6 | 45 | static atomic_t scsi_host_next_hn; /* host_no for next new host */ |
1da177e4 LT |
46 | |
47 | ||
ee959b00 | 48 | static void scsi_host_cls_release(struct device *dev) |
1da177e4 | 49 | { |
ee959b00 | 50 | put_device(&class_to_shost(dev)->shost_gendev); |
1da177e4 LT |
51 | } |
52 | ||
53 | static struct class shost_class = { | |
54 | .name = "scsi_host", | |
ee959b00 | 55 | .dev_release = scsi_host_cls_release, |
1da177e4 LT |
56 | }; |
57 | ||
d3301874 | 58 | /** |
eb44820c | 59 | * scsi_host_set_state - Take the given host through the host state model. |
d3301874 MA |
60 | * @shost: scsi host to change the state of. |
61 | * @state: state to change to. | |
62 | * | |
63 | * Returns zero if unsuccessful or an error if the requested | |
64 | * transition is illegal. | |
65 | **/ | |
66 | int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state) | |
67 | { | |
68 | enum scsi_host_state oldstate = shost->shost_state; | |
69 | ||
70 | if (state == oldstate) | |
71 | return 0; | |
72 | ||
73 | switch (state) { | |
74 | case SHOST_CREATED: | |
75 | /* There are no legal states that come back to | |
76 | * created. This is the manually initialised start | |
77 | * state */ | |
78 | goto illegal; | |
79 | ||
80 | case SHOST_RUNNING: | |
81 | switch (oldstate) { | |
82 | case SHOST_CREATED: | |
83 | case SHOST_RECOVERY: | |
84 | break; | |
85 | default: | |
86 | goto illegal; | |
87 | } | |
88 | break; | |
89 | ||
90 | case SHOST_RECOVERY: | |
91 | switch (oldstate) { | |
92 | case SHOST_RUNNING: | |
93 | break; | |
94 | default: | |
95 | goto illegal; | |
96 | } | |
97 | break; | |
98 | ||
99 | case SHOST_CANCEL: | |
100 | switch (oldstate) { | |
101 | case SHOST_CREATED: | |
102 | case SHOST_RUNNING: | |
939647ee | 103 | case SHOST_CANCEL_RECOVERY: |
d3301874 MA |
104 | break; |
105 | default: | |
106 | goto illegal; | |
107 | } | |
108 | break; | |
109 | ||
110 | case SHOST_DEL: | |
111 | switch (oldstate) { | |
112 | case SHOST_CANCEL: | |
939647ee | 113 | case SHOST_DEL_RECOVERY: |
d3301874 MA |
114 | break; |
115 | default: | |
116 | goto illegal; | |
117 | } | |
118 | break; | |
119 | ||
939647ee JB |
120 | case SHOST_CANCEL_RECOVERY: |
121 | switch (oldstate) { | |
122 | case SHOST_CANCEL: | |
123 | case SHOST_RECOVERY: | |
124 | break; | |
125 | default: | |
126 | goto illegal; | |
127 | } | |
128 | break; | |
129 | ||
130 | case SHOST_DEL_RECOVERY: | |
131 | switch (oldstate) { | |
132 | case SHOST_CANCEL_RECOVERY: | |
133 | break; | |
134 | default: | |
135 | goto illegal; | |
136 | } | |
137 | break; | |
d3301874 MA |
138 | } |
139 | shost->shost_state = state; | |
140 | return 0; | |
141 | ||
142 | illegal: | |
143 | SCSI_LOG_ERROR_RECOVERY(1, | |
9ccfc756 JB |
144 | shost_printk(KERN_ERR, shost, |
145 | "Illegal host state transition" | |
146 | "%s->%s\n", | |
147 | scsi_host_state_name(oldstate), | |
148 | scsi_host_state_name(state))); | |
d3301874 MA |
149 | return -EINVAL; |
150 | } | |
151 | EXPORT_SYMBOL(scsi_host_set_state); | |
152 | ||
1da177e4 LT |
153 | /** |
154 | * scsi_remove_host - remove a scsi host | |
155 | * @shost: a pointer to a scsi host to remove | |
156 | **/ | |
157 | void scsi_remove_host(struct Scsi_Host *shost) | |
158 | { | |
939647ee | 159 | unsigned long flags; |
bc4f2401 | 160 | |
0b950672 | 161 | mutex_lock(&shost->scan_mutex); |
939647ee JB |
162 | spin_lock_irqsave(shost->host_lock, flags); |
163 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
164 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) { | |
165 | spin_unlock_irqrestore(shost->host_lock, flags); | |
0b950672 | 166 | mutex_unlock(&shost->scan_mutex); |
939647ee JB |
167 | return; |
168 | } | |
169 | spin_unlock_irqrestore(shost->host_lock, flags); | |
bc4f2401 AS |
170 | |
171 | scsi_autopm_get_host(shost); | |
1da177e4 | 172 | scsi_forget_host(shost); |
4e46bf89 | 173 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
174 | scsi_proc_host_rm(shost); |
175 | ||
939647ee JB |
176 | spin_lock_irqsave(shost->host_lock, flags); |
177 | if (scsi_host_set_state(shost, SHOST_DEL)) | |
178 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY)); | |
179 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
180 | |
181 | transport_unregister_device(&shost->shost_gendev); | |
ee959b00 | 182 | device_unregister(&shost->shost_dev); |
1da177e4 LT |
183 | device_del(&shost->shost_gendev); |
184 | } | |
185 | EXPORT_SYMBOL(scsi_remove_host); | |
186 | ||
187 | /** | |
d139b9bd | 188 | * scsi_add_host_with_dma - add a scsi host with dma device |
1da177e4 LT |
189 | * @shost: scsi host pointer to add |
190 | * @dev: a struct device of type scsi class | |
d139b9bd JB |
191 | * @dma_dev: dma device for the host |
192 | * | |
193 | * Note: You rarely need to worry about this unless you're in a | |
194 | * virtualised host environments, so use the simpler scsi_add_host() | |
195 | * function instead. | |
1da177e4 LT |
196 | * |
197 | * Return value: | |
198 | * 0 on success / != 0 for error | |
199 | **/ | |
d139b9bd JB |
200 | int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, |
201 | struct device *dma_dev) | |
1da177e4 LT |
202 | { |
203 | struct scsi_host_template *sht = shost->hostt; | |
204 | int error = -EINVAL; | |
205 | ||
206 | printk(KERN_INFO "scsi%d : %s\n", shost->host_no, | |
207 | sht->info ? sht->info(shost) : sht->name); | |
208 | ||
209 | if (!shost->can_queue) { | |
210 | printk(KERN_ERR "%s: can_queue = 0 no longer supported\n", | |
211 | sht->name); | |
542bd137 | 212 | goto fail; |
1da177e4 LT |
213 | } |
214 | ||
542bd137 JB |
215 | error = scsi_setup_command_freelist(shost); |
216 | if (error) | |
217 | goto fail; | |
218 | ||
1da177e4 LT |
219 | if (!shost->shost_gendev.parent) |
220 | shost->shost_gendev.parent = dev ? dev : &platform_bus; | |
d139b9bd | 221 | shost->dma_dev = dma_dev; |
1da177e4 LT |
222 | |
223 | error = device_add(&shost->shost_gendev); | |
224 | if (error) | |
225 | goto out; | |
226 | ||
bc4f2401 AS |
227 | pm_runtime_set_active(&shost->shost_gendev); |
228 | pm_runtime_enable(&shost->shost_gendev); | |
229 | device_enable_async_suspend(&shost->shost_gendev); | |
230 | ||
d3301874 | 231 | scsi_host_set_state(shost, SHOST_RUNNING); |
1da177e4 LT |
232 | get_device(shost->shost_gendev.parent); |
233 | ||
4cb077d9 RW |
234 | device_enable_async_suspend(&shost->shost_dev); |
235 | ||
ee959b00 | 236 | error = device_add(&shost->shost_dev); |
1da177e4 LT |
237 | if (error) |
238 | goto out_del_gendev; | |
239 | ||
240 | get_device(&shost->shost_gendev); | |
241 | ||
77cca462 JS |
242 | if (shost->transportt->host_size) { |
243 | shost->shost_data = kzalloc(shost->transportt->host_size, | |
244 | GFP_KERNEL); | |
245 | if (shost->shost_data == NULL) { | |
246 | error = -ENOMEM; | |
ee959b00 | 247 | goto out_del_dev; |
77cca462 JS |
248 | } |
249 | } | |
1da177e4 LT |
250 | |
251 | if (shost->transportt->create_work_queue) { | |
aab0de24 KS |
252 | snprintf(shost->work_q_name, sizeof(shost->work_q_name), |
253 | "scsi_wq_%d", shost->host_no); | |
1da177e4 LT |
254 | shost->work_q = create_singlethread_workqueue( |
255 | shost->work_q_name); | |
77cca462 JS |
256 | if (!shost->work_q) { |
257 | error = -EINVAL; | |
1da177e4 | 258 | goto out_free_shost_data; |
77cca462 | 259 | } |
1da177e4 LT |
260 | } |
261 | ||
262 | error = scsi_sysfs_add_host(shost); | |
263 | if (error) | |
264 | goto out_destroy_host; | |
265 | ||
266 | scsi_proc_host_add(shost); | |
267 | return error; | |
268 | ||
269 | out_destroy_host: | |
270 | if (shost->work_q) | |
271 | destroy_workqueue(shost->work_q); | |
272 | out_free_shost_data: | |
273 | kfree(shost->shost_data); | |
ee959b00 TJ |
274 | out_del_dev: |
275 | device_del(&shost->shost_dev); | |
1da177e4 LT |
276 | out_del_gendev: |
277 | device_del(&shost->shost_gendev); | |
278 | out: | |
542bd137 JB |
279 | scsi_destroy_command_freelist(shost); |
280 | fail: | |
1da177e4 LT |
281 | return error; |
282 | } | |
d139b9bd | 283 | EXPORT_SYMBOL(scsi_add_host_with_dma); |
1da177e4 LT |
284 | |
285 | static void scsi_host_dev_release(struct device *dev) | |
286 | { | |
287 | struct Scsi_Host *shost = dev_to_shost(dev); | |
288 | struct device *parent = dev->parent; | |
3308511c | 289 | struct request_queue *q; |
1da177e4 | 290 | |
77c01976 AS |
291 | scsi_proc_hostdir_rm(shost->hostt); |
292 | ||
c5478def CH |
293 | if (shost->ehandler) |
294 | kthread_stop(shost->ehandler); | |
1da177e4 LT |
295 | if (shost->work_q) |
296 | destroy_workqueue(shost->work_q); | |
3308511c BVA |
297 | q = shost->uspace_req_q; |
298 | if (q) { | |
299 | kfree(q->queuedata); | |
300 | q->queuedata = NULL; | |
301 | scsi_free_queue(q); | |
b58d9154 | 302 | } |
1da177e4 | 303 | |
1da177e4 | 304 | scsi_destroy_command_freelist(shost); |
86e33a29 JB |
305 | if (shost->bqt) |
306 | blk_free_tags(shost->bqt); | |
307 | ||
1da177e4 LT |
308 | kfree(shost->shost_data); |
309 | ||
1da177e4 LT |
310 | if (parent) |
311 | put_device(parent); | |
312 | kfree(shost); | |
313 | } | |
314 | ||
453cd0f3 | 315 | static struct device_type scsi_host_type = { |
b0ed4336 HR |
316 | .name = "scsi_host", |
317 | .release = scsi_host_dev_release, | |
318 | }; | |
319 | ||
1da177e4 LT |
320 | /** |
321 | * scsi_host_alloc - register a scsi host adapter instance. | |
322 | * @sht: pointer to scsi host template | |
323 | * @privsize: extra bytes to allocate for driver | |
324 | * | |
325 | * Note: | |
326 | * Allocate a new Scsi_Host and perform basic initialization. | |
327 | * The host is not published to the scsi midlayer until scsi_add_host | |
328 | * is called. | |
329 | * | |
330 | * Return value: | |
331 | * Pointer to a new Scsi_Host | |
332 | **/ | |
333 | struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) | |
334 | { | |
335 | struct Scsi_Host *shost; | |
c53033f6 | 336 | gfp_t gfp_mask = GFP_KERNEL; |
1da177e4 LT |
337 | |
338 | if (sht->unchecked_isa_dma && privsize) | |
339 | gfp_mask |= __GFP_DMA; | |
340 | ||
24669f75 | 341 | shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask); |
1da177e4 LT |
342 | if (!shost) |
343 | return NULL; | |
1da177e4 | 344 | |
4f777ed2 CH |
345 | shost->host_lock = &shost->default_lock; |
346 | spin_lock_init(shost->host_lock); | |
d3301874 | 347 | shost->shost_state = SHOST_CREATED; |
1da177e4 LT |
348 | INIT_LIST_HEAD(&shost->__devices); |
349 | INIT_LIST_HEAD(&shost->__targets); | |
350 | INIT_LIST_HEAD(&shost->eh_cmd_q); | |
351 | INIT_LIST_HEAD(&shost->starved_list); | |
352 | init_waitqueue_head(&shost->host_wait); | |
353 | ||
0b950672 | 354 | mutex_init(&shost->scan_mutex); |
1da177e4 | 355 | |
30c9afa6 JE |
356 | /* |
357 | * subtract one because we increment first then return, but we need to | |
358 | * know what the next host number was before increment | |
359 | */ | |
360 | shost->host_no = atomic_inc_return(&scsi_host_next_hn) - 1; | |
1da177e4 LT |
361 | shost->dma_channel = 0xff; |
362 | ||
363 | /* These three are default values which can be overridden */ | |
364 | shost->max_channel = 0; | |
365 | shost->max_id = 8; | |
366 | shost->max_lun = 8; | |
367 | ||
368 | /* Give each shost a default transportt */ | |
369 | shost->transportt = &blank_transport_template; | |
370 | ||
371 | /* | |
372 | * All drivers right now should be able to handle 12 byte | |
373 | * commands. Every so often there are requests for 16 byte | |
374 | * commands, but individual low-level drivers need to certify that | |
375 | * they actually do something sensible with such commands. | |
376 | */ | |
377 | shost->max_cmd_len = 12; | |
378 | shost->hostt = sht; | |
379 | shost->this_id = sht->this_id; | |
380 | shost->can_queue = sht->can_queue; | |
381 | shost->sg_tablesize = sht->sg_tablesize; | |
13f05c8d | 382 | shost->sg_prot_tablesize = sht->sg_prot_tablesize; |
1da177e4 LT |
383 | shost->cmd_per_lun = sht->cmd_per_lun; |
384 | shost->unchecked_isa_dma = sht->unchecked_isa_dma; | |
385 | shost->use_clustering = sht->use_clustering; | |
1da177e4 LT |
386 | shost->ordered_tag = sht->ordered_tag; |
387 | ||
7a39ac3f JB |
388 | if (sht->supported_mode == MODE_UNKNOWN) |
389 | /* means we didn't set it ... default to INITIATOR */ | |
390 | shost->active_mode = MODE_INITIATOR; | |
391 | else | |
392 | shost->active_mode = sht->supported_mode; | |
393 | ||
1da177e4 LT |
394 | if (sht->max_host_blocked) |
395 | shost->max_host_blocked = sht->max_host_blocked; | |
396 | else | |
397 | shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED; | |
398 | ||
399 | /* | |
400 | * If the driver imposes no hard sector transfer limit, start at | |
401 | * machine infinity initially. | |
402 | */ | |
403 | if (sht->max_sectors) | |
404 | shost->max_sectors = sht->max_sectors; | |
405 | else | |
406 | shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS; | |
407 | ||
408 | /* | |
409 | * assume a 4GB boundary, if not set | |
410 | */ | |
411 | if (sht->dma_boundary) | |
412 | shost->dma_boundary = sht->dma_boundary; | |
413 | else | |
414 | shost->dma_boundary = 0xffffffff; | |
415 | ||
1da177e4 | 416 | device_initialize(&shost->shost_gendev); |
71610f55 | 417 | dev_set_name(&shost->shost_gendev, "host%d", shost->host_no); |
b0ed4336 | 418 | shost->shost_gendev.bus = &scsi_bus_type; |
b0ed4336 | 419 | shost->shost_gendev.type = &scsi_host_type; |
1da177e4 | 420 | |
ee959b00 TJ |
421 | device_initialize(&shost->shost_dev); |
422 | shost->shost_dev.parent = &shost->shost_gendev; | |
423 | shost->shost_dev.class = &shost_class; | |
71610f55 | 424 | dev_set_name(&shost->shost_dev, "host%d", shost->host_no); |
f7120a4f | 425 | shost->shost_dev.groups = scsi_sysfs_shost_attr_groups; |
1da177e4 | 426 | |
c5478def CH |
427 | shost->ehandler = kthread_run(scsi_error_handler, shost, |
428 | "scsi_eh_%d", shost->host_no); | |
429 | if (IS_ERR(shost->ehandler)) { | |
e4bf25fb JM |
430 | printk(KERN_WARNING "scsi%d: error handler thread failed to spawn, error = %ld\n", |
431 | shost->host_no, PTR_ERR(shost->ehandler)); | |
542bd137 | 432 | goto fail_kfree; |
c5478def | 433 | } |
1da177e4 LT |
434 | |
435 | scsi_proc_hostdir_add(shost->hostt); | |
436 | return shost; | |
437 | ||
1da177e4 LT |
438 | fail_kfree: |
439 | kfree(shost); | |
440 | return NULL; | |
441 | } | |
442 | EXPORT_SYMBOL(scsi_host_alloc); | |
443 | ||
444 | struct Scsi_Host *scsi_register(struct scsi_host_template *sht, int privsize) | |
445 | { | |
446 | struct Scsi_Host *shost = scsi_host_alloc(sht, privsize); | |
447 | ||
448 | if (!sht->detect) { | |
449 | printk(KERN_WARNING "scsi_register() called on new-style " | |
450 | "template for driver %s\n", sht->name); | |
451 | dump_stack(); | |
452 | } | |
453 | ||
454 | if (shost) | |
455 | list_add_tail(&shost->sht_legacy_list, &sht->legacy_hosts); | |
456 | return shost; | |
457 | } | |
458 | EXPORT_SYMBOL(scsi_register); | |
459 | ||
460 | void scsi_unregister(struct Scsi_Host *shost) | |
461 | { | |
462 | list_del(&shost->sht_legacy_list); | |
463 | scsi_host_put(shost); | |
464 | } | |
465 | EXPORT_SYMBOL(scsi_unregister); | |
466 | ||
ee959b00 | 467 | static int __scsi_host_match(struct device *dev, void *data) |
9c770108 DY |
468 | { |
469 | struct Scsi_Host *p; | |
470 | unsigned short *hostnum = (unsigned short *)data; | |
471 | ||
ee959b00 | 472 | p = class_to_shost(dev); |
9c770108 DY |
473 | return p->host_no == *hostnum; |
474 | } | |
475 | ||
1da177e4 LT |
476 | /** |
477 | * scsi_host_lookup - get a reference to a Scsi_Host by host no | |
1da177e4 LT |
478 | * @hostnum: host number to locate |
479 | * | |
480 | * Return value: | |
481 | * A pointer to located Scsi_Host or NULL. | |
3ed78972 MC |
482 | * |
483 | * The caller must do a scsi_host_put() to drop the reference | |
484 | * that scsi_host_get() took. The put_device() below dropped | |
485 | * the reference from class_find_device(). | |
1da177e4 LT |
486 | **/ |
487 | struct Scsi_Host *scsi_host_lookup(unsigned short hostnum) | |
488 | { | |
ee959b00 | 489 | struct device *cdev; |
315cb0ad | 490 | struct Scsi_Host *shost = NULL; |
1da177e4 | 491 | |
695794ae GKH |
492 | cdev = class_find_device(&shost_class, NULL, &hostnum, |
493 | __scsi_host_match); | |
3ed78972 | 494 | if (cdev) { |
9c770108 | 495 | shost = scsi_host_get(class_to_shost(cdev)); |
3ed78972 MC |
496 | put_device(cdev); |
497 | } | |
1da177e4 LT |
498 | return shost; |
499 | } | |
500 | EXPORT_SYMBOL(scsi_host_lookup); | |
501 | ||
502 | /** | |
503 | * scsi_host_get - inc a Scsi_Host ref count | |
504 | * @shost: Pointer to Scsi_Host to inc. | |
505 | **/ | |
506 | struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost) | |
507 | { | |
d3301874 | 508 | if ((shost->shost_state == SHOST_DEL) || |
1da177e4 LT |
509 | !get_device(&shost->shost_gendev)) |
510 | return NULL; | |
511 | return shost; | |
512 | } | |
513 | EXPORT_SYMBOL(scsi_host_get); | |
514 | ||
515 | /** | |
516 | * scsi_host_put - dec a Scsi_Host ref count | |
517 | * @shost: Pointer to Scsi_Host to dec. | |
518 | **/ | |
519 | void scsi_host_put(struct Scsi_Host *shost) | |
520 | { | |
521 | put_device(&shost->shost_gendev); | |
522 | } | |
523 | EXPORT_SYMBOL(scsi_host_put); | |
524 | ||
525 | int scsi_init_hosts(void) | |
526 | { | |
527 | return class_register(&shost_class); | |
528 | } | |
529 | ||
530 | void scsi_exit_hosts(void) | |
531 | { | |
532 | class_unregister(&shost_class); | |
533 | } | |
534 | ||
535 | int scsi_is_host_device(const struct device *dev) | |
536 | { | |
b0ed4336 | 537 | return dev->type == &scsi_host_type; |
1da177e4 LT |
538 | } |
539 | EXPORT_SYMBOL(scsi_is_host_device); | |
540 | ||
541 | /** | |
542 | * scsi_queue_work - Queue work to the Scsi_Host workqueue. | |
543 | * @shost: Pointer to Scsi_Host. | |
544 | * @work: Work to queue for execution. | |
545 | * | |
546 | * Return value: | |
dd7e2f22 MR |
547 | * 1 - work queued for execution |
548 | * 0 - work is already queued | |
549 | * -EINVAL - work queue doesn't exist | |
1da177e4 LT |
550 | **/ |
551 | int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work) | |
552 | { | |
553 | if (unlikely(!shost->work_q)) { | |
554 | printk(KERN_ERR | |
555 | "ERROR: Scsi host '%s' attempted to queue scsi-work, " | |
556 | "when no workqueue created.\n", shost->hostt->name); | |
557 | dump_stack(); | |
558 | ||
559 | return -EINVAL; | |
560 | } | |
561 | ||
562 | return queue_work(shost->work_q, work); | |
563 | } | |
564 | EXPORT_SYMBOL_GPL(scsi_queue_work); | |
565 | ||
566 | /** | |
567 | * scsi_flush_work - Flush a Scsi_Host's workqueue. | |
568 | * @shost: Pointer to Scsi_Host. | |
569 | **/ | |
570 | void scsi_flush_work(struct Scsi_Host *shost) | |
571 | { | |
572 | if (!shost->work_q) { | |
573 | printk(KERN_ERR | |
574 | "ERROR: Scsi host '%s' attempted to flush scsi-work, " | |
575 | "when no workqueue created.\n", shost->hostt->name); | |
576 | dump_stack(); | |
577 | return; | |
578 | } | |
579 | ||
580 | flush_workqueue(shost->work_q); | |
581 | } | |
582 | EXPORT_SYMBOL_GPL(scsi_flush_work); |