Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/s390/cio/ccwgroup.c | |
3 | * bus driver for ccwgroup | |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, | |
6 | * IBM Corporation | |
7 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) | |
4ce3b30c | 8 | * Cornelia Huck (cornelia.huck@de.ibm.com) |
1da177e4 LT |
9 | */ |
10 | #include <linux/module.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/ctype.h> | |
17 | #include <linux/dcache.h> | |
18 | ||
1da177e4 LT |
19 | #include <asm/ccwdev.h> |
20 | #include <asm/ccwgroup.h> | |
21 | ||
22 | /* In Linux 2.4, we had a channel device layer called "chandev" | |
23 | * that did all sorts of obscure stuff for networking devices. | |
24 | * This is another driver that serves as a replacement for just | |
25 | * one of its functions, namely the translation of single subchannels | |
26 | * to devices that use multiple subchannels. | |
27 | */ | |
28 | ||
29 | /* a device matches a driver if all its slave devices match the same | |
30 | * entry of the driver */ | |
31 | static int | |
32 | ccwgroup_bus_match (struct device * dev, struct device_driver * drv) | |
33 | { | |
34 | struct ccwgroup_device *gdev; | |
35 | struct ccwgroup_driver *gdrv; | |
36 | ||
084325d8 CH |
37 | gdev = to_ccwgroupdev(dev); |
38 | gdrv = to_ccwgroupdrv(drv); | |
1da177e4 LT |
39 | |
40 | if (gdev->creator_id == gdrv->driver_id) | |
41 | return 1; | |
42 | ||
43 | return 0; | |
44 | } | |
45 | static int | |
7eff2e7a | 46 | ccwgroup_uevent (struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
47 | { |
48 | /* TODO */ | |
49 | return 0; | |
50 | } | |
51 | ||
f9ccf456 | 52 | static struct bus_type ccwgroup_bus_type; |
1da177e4 | 53 | |
4d284cac | 54 | static void |
1da177e4 LT |
55 | __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev) |
56 | { | |
57 | int i; | |
58 | char str[8]; | |
59 | ||
60 | for (i = 0; i < gdev->count; i++) { | |
61 | sprintf(str, "cdev%d", i); | |
62 | sysfs_remove_link(&gdev->dev.kobj, str); | |
63 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device"); | |
64 | } | |
65 | ||
66 | } | |
67 | ||
68 | /* | |
69 | * Provide an 'ungroup' attribute so the user can remove group devices no | |
70 | * longer needed or accidentially created. Saves memory :) | |
71 | */ | |
d9a9cdfb AS |
72 | static void ccwgroup_ungroup_callback(struct device *dev) |
73 | { | |
74 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); | |
75 | ||
d76123eb | 76 | mutex_lock(&gdev->reg_mutex); |
1a908c73 CH |
77 | if (device_is_registered(&gdev->dev)) { |
78 | __ccwgroup_remove_symlinks(gdev); | |
79 | device_unregister(dev); | |
80 | } | |
d76123eb | 81 | mutex_unlock(&gdev->reg_mutex); |
d9a9cdfb AS |
82 | } |
83 | ||
1da177e4 | 84 | static ssize_t |
3fd3c0a5 | 85 | ccwgroup_ungroup_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
86 | { |
87 | struct ccwgroup_device *gdev; | |
d9a9cdfb | 88 | int rc; |
1da177e4 LT |
89 | |
90 | gdev = to_ccwgroupdev(dev); | |
91 | ||
92 | if (gdev->state != CCWGROUP_OFFLINE) | |
93 | return -EINVAL; | |
94 | ||
d9a9cdfb AS |
95 | /* Note that we cannot unregister the device from one of its |
96 | * attribute methods, so we have to use this roundabout approach. | |
97 | */ | |
98 | rc = device_schedule_callback(dev, ccwgroup_ungroup_callback); | |
99 | if (rc) | |
100 | count = rc; | |
1da177e4 LT |
101 | return count; |
102 | } | |
103 | ||
104 | static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store); | |
105 | ||
106 | static void | |
107 | ccwgroup_release (struct device *dev) | |
108 | { | |
109 | struct ccwgroup_device *gdev; | |
110 | int i; | |
111 | ||
112 | gdev = to_ccwgroupdev(dev); | |
113 | ||
114 | for (i = 0; i < gdev->count; i++) { | |
16f7f956 PO |
115 | if (gdev->cdev[i]) { |
116 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
117 | put_device(&gdev->cdev[i]->dev); | |
118 | } | |
1da177e4 LT |
119 | } |
120 | kfree(gdev); | |
121 | } | |
122 | ||
4d284cac | 123 | static int |
1da177e4 LT |
124 | __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) |
125 | { | |
126 | char str[8]; | |
127 | int i, rc; | |
128 | ||
129 | for (i = 0; i < gdev->count; i++) { | |
130 | rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, &gdev->dev.kobj, | |
131 | "group_device"); | |
132 | if (rc) { | |
133 | for (--i; i >= 0; i--) | |
134 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
135 | "group_device"); | |
136 | return rc; | |
137 | } | |
138 | } | |
139 | for (i = 0; i < gdev->count; i++) { | |
140 | sprintf(str, "cdev%d", i); | |
141 | rc = sysfs_create_link(&gdev->dev.kobj, &gdev->cdev[i]->dev.kobj, | |
142 | str); | |
143 | if (rc) { | |
144 | for (--i; i >= 0; i--) { | |
145 | sprintf(str, "cdev%d", i); | |
146 | sysfs_remove_link(&gdev->dev.kobj, str); | |
147 | } | |
148 | for (i = 0; i < gdev->count; i++) | |
149 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
150 | "group_device"); | |
151 | return rc; | |
152 | } | |
153 | } | |
154 | return 0; | |
155 | } | |
156 | ||
022b660a UB |
157 | static int __get_next_bus_id(const char **buf, char *bus_id) |
158 | { | |
159 | int rc, len; | |
160 | char *start, *end; | |
161 | ||
162 | start = (char *)*buf; | |
163 | end = strchr(start, ','); | |
164 | if (!end) { | |
165 | /* Last entry. Strip trailing newline, if applicable. */ | |
166 | end = strchr(start, '\n'); | |
167 | if (end) | |
168 | *end = '\0'; | |
169 | len = strlen(start) + 1; | |
170 | } else { | |
171 | len = end - start + 1; | |
172 | end++; | |
173 | } | |
174 | if (len < BUS_ID_SIZE) { | |
175 | strlcpy(bus_id, start, len); | |
176 | rc = 0; | |
177 | } else | |
178 | rc = -EINVAL; | |
179 | *buf = end; | |
180 | return rc; | |
181 | } | |
182 | ||
183 | static int __is_valid_bus_id(char bus_id[BUS_ID_SIZE]) | |
184 | { | |
185 | int cssid, ssid, devno; | |
186 | ||
187 | /* Must be of form %x.%x.%04x */ | |
188 | if (sscanf(bus_id, "%x.%1x.%04x", &cssid, &ssid, &devno) != 3) | |
189 | return 0; | |
190 | return 1; | |
191 | } | |
192 | ||
b2ffd8e9 | 193 | /** |
022b660a | 194 | * ccwgroup_create_from_string() - create and register a ccw group device |
b2ffd8e9 CH |
195 | * @root: parent device for the new device |
196 | * @creator_id: identifier of creating driver | |
197 | * @cdrv: ccw driver of slave devices | |
022b660a UB |
198 | * @num_devices: number of slave devices |
199 | * @buf: buffer containing comma separated bus ids of slave devices | |
b2ffd8e9 CH |
200 | * |
201 | * Create and register a new ccw group device as a child of @root. Slave | |
022b660a | 202 | * devices are obtained from the list of bus ids given in @buf and must all |
b2ffd8e9 CH |
203 | * belong to @cdrv. |
204 | * Returns: | |
205 | * %0 on success and an error code on failure. | |
206 | * Context: | |
207 | * non-atomic | |
1da177e4 | 208 | */ |
022b660a UB |
209 | int ccwgroup_create_from_string(struct device *root, unsigned int creator_id, |
210 | struct ccw_driver *cdrv, int num_devices, | |
211 | const char *buf) | |
1da177e4 LT |
212 | { |
213 | struct ccwgroup_device *gdev; | |
022b660a UB |
214 | int rc, i; |
215 | char tmp_bus_id[BUS_ID_SIZE]; | |
216 | const char *curr_buf; | |
1da177e4 | 217 | |
022b660a UB |
218 | gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]), |
219 | GFP_KERNEL); | |
1da177e4 LT |
220 | if (!gdev) |
221 | return -ENOMEM; | |
222 | ||
1da177e4 | 223 | atomic_set(&gdev->onoff, 0); |
d76123eb CH |
224 | mutex_init(&gdev->reg_mutex); |
225 | mutex_lock(&gdev->reg_mutex); | |
16f7f956 PO |
226 | gdev->creator_id = creator_id; |
227 | gdev->count = num_devices; | |
228 | gdev->dev.bus = &ccwgroup_bus_type; | |
229 | gdev->dev.parent = root; | |
230 | gdev->dev.release = ccwgroup_release; | |
231 | device_initialize(&gdev->dev); | |
232 | ||
022b660a UB |
233 | curr_buf = buf; |
234 | for (i = 0; i < num_devices && curr_buf; i++) { | |
235 | rc = __get_next_bus_id(&curr_buf, tmp_bus_id); | |
236 | if (rc != 0) | |
237 | goto error; | |
238 | if (!__is_valid_bus_id(tmp_bus_id)) { | |
239 | rc = -EINVAL; | |
240 | goto error; | |
241 | } | |
242 | gdev->cdev[i] = get_ccwdev_by_busid(cdrv, tmp_bus_id); | |
243 | /* | |
244 | * All devices have to be of the same type in | |
245 | * order to be grouped. | |
246 | */ | |
1da177e4 LT |
247 | if (!gdev->cdev[i] |
248 | || gdev->cdev[i]->id.driver_info != | |
249 | gdev->cdev[0]->id.driver_info) { | |
250 | rc = -EINVAL; | |
d76123eb | 251 | goto error; |
1da177e4 LT |
252 | } |
253 | /* Don't allow a device to belong to more than one group. */ | |
db6a6423 | 254 | if (dev_get_drvdata(&gdev->cdev[i]->dev)) { |
1da177e4 | 255 | rc = -EINVAL; |
d76123eb | 256 | goto error; |
1da177e4 | 257 | } |
db6a6423 | 258 | dev_set_drvdata(&gdev->cdev[i]->dev, gdev); |
17088229 | 259 | } |
022b660a UB |
260 | /* Check for sufficient number of bus ids. */ |
261 | if (i < num_devices && !curr_buf) { | |
262 | rc = -EINVAL; | |
263 | goto error; | |
264 | } | |
265 | /* Check for trailing stuff. */ | |
266 | if (i == num_devices && strlen(curr_buf) > 0) { | |
267 | rc = -EINVAL; | |
268 | goto error; | |
269 | } | |
1da177e4 LT |
270 | |
271 | snprintf (gdev->dev.bus_id, BUS_ID_SIZE, "%s", | |
272 | gdev->cdev[0]->dev.bus_id); | |
273 | ||
16f7f956 | 274 | rc = device_add(&gdev->dev); |
1da177e4 | 275 | if (rc) |
d76123eb | 276 | goto error; |
1da177e4 LT |
277 | get_device(&gdev->dev); |
278 | rc = device_create_file(&gdev->dev, &dev_attr_ungroup); | |
279 | ||
280 | if (rc) { | |
281 | device_unregister(&gdev->dev); | |
282 | goto error; | |
283 | } | |
284 | ||
285 | rc = __ccwgroup_create_symlinks(gdev); | |
286 | if (!rc) { | |
d76123eb | 287 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
288 | put_device(&gdev->dev); |
289 | return 0; | |
290 | } | |
291 | device_remove_file(&gdev->dev, &dev_attr_ungroup); | |
292 | device_unregister(&gdev->dev); | |
293 | error: | |
022b660a | 294 | for (i = 0; i < num_devices; i++) |
1da177e4 | 295 | if (gdev->cdev[i]) { |
db6a6423 CH |
296 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
297 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
17088229 | 298 | put_device(&gdev->cdev[i]->dev); |
1da177e4 | 299 | } |
d76123eb CH |
300 | mutex_unlock(&gdev->reg_mutex); |
301 | put_device(&gdev->dev); | |
1da177e4 LT |
302 | return rc; |
303 | } | |
022b660a | 304 | EXPORT_SYMBOL(ccwgroup_create_from_string); |
1da177e4 LT |
305 | |
306 | static int __init | |
307 | init_ccwgroup (void) | |
308 | { | |
309 | return bus_register (&ccwgroup_bus_type); | |
310 | } | |
311 | ||
312 | static void __exit | |
313 | cleanup_ccwgroup (void) | |
314 | { | |
315 | bus_unregister (&ccwgroup_bus_type); | |
316 | } | |
317 | ||
318 | module_init(init_ccwgroup); | |
319 | module_exit(cleanup_ccwgroup); | |
320 | ||
321 | /************************** driver stuff ******************************/ | |
322 | ||
323 | static int | |
324 | ccwgroup_set_online(struct ccwgroup_device *gdev) | |
325 | { | |
326 | struct ccwgroup_driver *gdrv; | |
327 | int ret; | |
328 | ||
973bd993 | 329 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
1da177e4 LT |
330 | return -EAGAIN; |
331 | if (gdev->state == CCWGROUP_ONLINE) { | |
332 | ret = 0; | |
333 | goto out; | |
334 | } | |
335 | if (!gdev->dev.driver) { | |
336 | ret = -EINVAL; | |
337 | goto out; | |
338 | } | |
339 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
a0016408 | 340 | if ((ret = gdrv->set_online ? gdrv->set_online(gdev) : 0)) |
1da177e4 LT |
341 | goto out; |
342 | ||
343 | gdev->state = CCWGROUP_ONLINE; | |
344 | out: | |
345 | atomic_set(&gdev->onoff, 0); | |
346 | return ret; | |
347 | } | |
348 | ||
349 | static int | |
350 | ccwgroup_set_offline(struct ccwgroup_device *gdev) | |
351 | { | |
352 | struct ccwgroup_driver *gdrv; | |
353 | int ret; | |
354 | ||
973bd993 | 355 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
1da177e4 LT |
356 | return -EAGAIN; |
357 | if (gdev->state == CCWGROUP_OFFLINE) { | |
358 | ret = 0; | |
359 | goto out; | |
360 | } | |
361 | if (!gdev->dev.driver) { | |
362 | ret = -EINVAL; | |
363 | goto out; | |
364 | } | |
365 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
a0016408 | 366 | if ((ret = gdrv->set_offline ? gdrv->set_offline(gdev) : 0)) |
1da177e4 LT |
367 | goto out; |
368 | ||
369 | gdev->state = CCWGROUP_OFFLINE; | |
370 | out: | |
371 | atomic_set(&gdev->onoff, 0); | |
372 | return ret; | |
373 | } | |
374 | ||
375 | static ssize_t | |
3fd3c0a5 | 376 | ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
377 | { |
378 | struct ccwgroup_device *gdev; | |
379 | struct ccwgroup_driver *gdrv; | |
2f972202 | 380 | unsigned long value; |
1da177e4 LT |
381 | int ret; |
382 | ||
383 | gdev = to_ccwgroupdev(dev); | |
384 | if (!dev->driver) | |
385 | return count; | |
386 | ||
387 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
388 | if (!try_module_get(gdrv->owner)) | |
389 | return -EINVAL; | |
390 | ||
2f972202 CH |
391 | ret = strict_strtoul(buf, 0, &value); |
392 | if (ret) | |
393 | goto out; | |
1da177e4 LT |
394 | ret = count; |
395 | if (value == 1) | |
396 | ccwgroup_set_online(gdev); | |
397 | else if (value == 0) | |
398 | ccwgroup_set_offline(gdev); | |
399 | else | |
400 | ret = -EINVAL; | |
2f972202 | 401 | out: |
1da177e4 LT |
402 | module_put(gdrv->owner); |
403 | return ret; | |
404 | } | |
405 | ||
406 | static ssize_t | |
3fd3c0a5 | 407 | ccwgroup_online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
408 | { |
409 | int online; | |
410 | ||
411 | online = (to_ccwgroupdev(dev)->state == CCWGROUP_ONLINE); | |
412 | ||
413 | return sprintf(buf, online ? "1\n" : "0\n"); | |
414 | } | |
415 | ||
416 | static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); | |
417 | ||
418 | static int | |
419 | ccwgroup_probe (struct device *dev) | |
420 | { | |
421 | struct ccwgroup_device *gdev; | |
422 | struct ccwgroup_driver *gdrv; | |
423 | ||
424 | int ret; | |
425 | ||
426 | gdev = to_ccwgroupdev(dev); | |
427 | gdrv = to_ccwgroupdrv(dev->driver); | |
428 | ||
429 | if ((ret = device_create_file(dev, &dev_attr_online))) | |
430 | return ret; | |
431 | ||
1da177e4 LT |
432 | ret = gdrv->probe ? gdrv->probe(gdev) : -ENODEV; |
433 | if (ret) | |
434 | device_remove_file(dev, &dev_attr_online); | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
439 | static int | |
440 | ccwgroup_remove (struct device *dev) | |
441 | { | |
442 | struct ccwgroup_device *gdev; | |
443 | struct ccwgroup_driver *gdrv; | |
444 | ||
445 | gdev = to_ccwgroupdev(dev); | |
446 | gdrv = to_ccwgroupdrv(dev->driver); | |
447 | ||
1da177e4 LT |
448 | device_remove_file(dev, &dev_attr_online); |
449 | ||
450 | if (gdrv && gdrv->remove) | |
451 | gdrv->remove(gdev); | |
452 | return 0; | |
453 | } | |
454 | ||
01bc8ad1 CH |
455 | static void ccwgroup_shutdown(struct device *dev) |
456 | { | |
457 | struct ccwgroup_device *gdev; | |
458 | struct ccwgroup_driver *gdrv; | |
459 | ||
460 | gdev = to_ccwgroupdev(dev); | |
461 | gdrv = to_ccwgroupdrv(dev->driver); | |
462 | if (gdrv && gdrv->shutdown) | |
463 | gdrv->shutdown(gdev); | |
464 | } | |
465 | ||
f9ccf456 RK |
466 | static struct bus_type ccwgroup_bus_type = { |
467 | .name = "ccwgroup", | |
468 | .match = ccwgroup_bus_match, | |
469 | .uevent = ccwgroup_uevent, | |
470 | .probe = ccwgroup_probe, | |
471 | .remove = ccwgroup_remove, | |
01bc8ad1 | 472 | .shutdown = ccwgroup_shutdown, |
f9ccf456 RK |
473 | }; |
474 | ||
b2ffd8e9 CH |
475 | /** |
476 | * ccwgroup_driver_register() - register a ccw group driver | |
477 | * @cdriver: driver to be registered | |
478 | * | |
479 | * This function is mainly a wrapper around driver_register(). | |
480 | */ | |
481 | int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) | |
1da177e4 LT |
482 | { |
483 | /* register our new driver with the core */ | |
292888c8 HC |
484 | cdriver->driver.bus = &ccwgroup_bus_type; |
485 | cdriver->driver.name = cdriver->name; | |
4beee646 | 486 | cdriver->driver.owner = cdriver->owner; |
1da177e4 LT |
487 | |
488 | return driver_register(&cdriver->driver); | |
489 | } | |
490 | ||
b0744bd2 | 491 | static int |
887ab599 | 492 | __ccwgroup_match_all(struct device *dev, void *data) |
1da177e4 | 493 | { |
887ab599 | 494 | return 1; |
1da177e4 LT |
495 | } |
496 | ||
b2ffd8e9 CH |
497 | /** |
498 | * ccwgroup_driver_unregister() - deregister a ccw group driver | |
499 | * @cdriver: driver to be deregistered | |
500 | * | |
501 | * This function is mainly a wrapper around driver_unregister(). | |
502 | */ | |
503 | void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) | |
1da177e4 | 504 | { |
887ab599 CH |
505 | struct device *dev; |
506 | ||
1da177e4 LT |
507 | /* We don't want ccwgroup devices to live longer than their driver. */ |
508 | get_driver(&cdriver->driver); | |
887ab599 CH |
509 | while ((dev = driver_find_device(&cdriver->driver, NULL, NULL, |
510 | __ccwgroup_match_all))) { | |
d76123eb CH |
511 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
512 | ||
513 | mutex_lock(&gdev->reg_mutex); | |
514 | __ccwgroup_remove_symlinks(gdev); | |
887ab599 | 515 | device_unregister(dev); |
d76123eb | 516 | mutex_unlock(&gdev->reg_mutex); |
887ab599 CH |
517 | put_device(dev); |
518 | } | |
1da177e4 LT |
519 | put_driver(&cdriver->driver); |
520 | driver_unregister(&cdriver->driver); | |
521 | } | |
522 | ||
b2ffd8e9 CH |
523 | /** |
524 | * ccwgroup_probe_ccwdev() - probe function for slave devices | |
525 | * @cdev: ccw device to be probed | |
526 | * | |
527 | * This is a dummy probe function for ccw devices that are slave devices in | |
528 | * a ccw group device. | |
529 | * Returns: | |
530 | * always %0 | |
531 | */ | |
532 | int ccwgroup_probe_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
533 | { |
534 | return 0; | |
535 | } | |
536 | ||
4d284cac | 537 | static struct ccwgroup_device * |
1da177e4 LT |
538 | __ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev) |
539 | { | |
540 | struct ccwgroup_device *gdev; | |
541 | ||
db6a6423 CH |
542 | gdev = dev_get_drvdata(&cdev->dev); |
543 | if (gdev) { | |
1da177e4 | 544 | if (get_device(&gdev->dev)) { |
d76123eb | 545 | mutex_lock(&gdev->reg_mutex); |
d305ef5d | 546 | if (device_is_registered(&gdev->dev)) |
1da177e4 | 547 | return gdev; |
d76123eb | 548 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
549 | put_device(&gdev->dev); |
550 | } | |
551 | return NULL; | |
552 | } | |
553 | return NULL; | |
554 | } | |
555 | ||
b2ffd8e9 CH |
556 | /** |
557 | * ccwgroup_remove_ccwdev() - remove function for slave devices | |
558 | * @cdev: ccw device to be removed | |
559 | * | |
560 | * This is a remove function for ccw devices that are slave devices in a ccw | |
561 | * group device. It sets the ccw device offline and also deregisters the | |
562 | * embedding ccw group device. | |
563 | */ | |
564 | void ccwgroup_remove_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
565 | { |
566 | struct ccwgroup_device *gdev; | |
567 | ||
568 | /* Ignore offlining errors, device is gone anyway. */ | |
569 | ccw_device_set_offline(cdev); | |
570 | /* If one of its devices is gone, the whole group is done for. */ | |
571 | gdev = __ccwgroup_get_gdev_by_cdev(cdev); | |
572 | if (gdev) { | |
573 | __ccwgroup_remove_symlinks(gdev); | |
574 | device_unregister(&gdev->dev); | |
d76123eb | 575 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
576 | put_device(&gdev->dev); |
577 | } | |
578 | } | |
579 | ||
580 | MODULE_LICENSE("GPL"); | |
581 | EXPORT_SYMBOL(ccwgroup_driver_register); | |
582 | EXPORT_SYMBOL(ccwgroup_driver_unregister); | |
1da177e4 LT |
583 | EXPORT_SYMBOL(ccwgroup_probe_ccwdev); |
584 | EXPORT_SYMBOL(ccwgroup_remove_ccwdev); |