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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 | 115 | if (gdev->cdev[i]) { |
f26fd5d6 CH |
116 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
117 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
16f7f956 PO |
118 | put_device(&gdev->cdev[i]->dev); |
119 | } | |
1da177e4 LT |
120 | } |
121 | kfree(gdev); | |
122 | } | |
123 | ||
4d284cac | 124 | static int |
1da177e4 LT |
125 | __ccwgroup_create_symlinks(struct ccwgroup_device *gdev) |
126 | { | |
127 | char str[8]; | |
128 | int i, rc; | |
129 | ||
130 | for (i = 0; i < gdev->count; i++) { | |
131 | rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, &gdev->dev.kobj, | |
132 | "group_device"); | |
133 | if (rc) { | |
134 | for (--i; i >= 0; i--) | |
135 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
136 | "group_device"); | |
137 | return rc; | |
138 | } | |
139 | } | |
140 | for (i = 0; i < gdev->count; i++) { | |
141 | sprintf(str, "cdev%d", i); | |
142 | rc = sysfs_create_link(&gdev->dev.kobj, &gdev->cdev[i]->dev.kobj, | |
143 | str); | |
144 | if (rc) { | |
145 | for (--i; i >= 0; i--) { | |
146 | sprintf(str, "cdev%d", i); | |
147 | sysfs_remove_link(&gdev->dev.kobj, str); | |
148 | } | |
149 | for (i = 0; i < gdev->count; i++) | |
150 | sysfs_remove_link(&gdev->cdev[i]->dev.kobj, | |
151 | "group_device"); | |
152 | return rc; | |
153 | } | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
022b660a UB |
158 | static int __get_next_bus_id(const char **buf, char *bus_id) |
159 | { | |
160 | int rc, len; | |
161 | char *start, *end; | |
162 | ||
163 | start = (char *)*buf; | |
164 | end = strchr(start, ','); | |
165 | if (!end) { | |
166 | /* Last entry. Strip trailing newline, if applicable. */ | |
167 | end = strchr(start, '\n'); | |
168 | if (end) | |
169 | *end = '\0'; | |
170 | len = strlen(start) + 1; | |
171 | } else { | |
172 | len = end - start + 1; | |
173 | end++; | |
174 | } | |
175 | if (len < BUS_ID_SIZE) { | |
176 | strlcpy(bus_id, start, len); | |
177 | rc = 0; | |
178 | } else | |
179 | rc = -EINVAL; | |
180 | *buf = end; | |
181 | return rc; | |
182 | } | |
183 | ||
184 | static int __is_valid_bus_id(char bus_id[BUS_ID_SIZE]) | |
185 | { | |
186 | int cssid, ssid, devno; | |
187 | ||
188 | /* Must be of form %x.%x.%04x */ | |
189 | if (sscanf(bus_id, "%x.%1x.%04x", &cssid, &ssid, &devno) != 3) | |
190 | return 0; | |
191 | return 1; | |
192 | } | |
193 | ||
b2ffd8e9 | 194 | /** |
022b660a | 195 | * ccwgroup_create_from_string() - create and register a ccw group device |
b2ffd8e9 CH |
196 | * @root: parent device for the new device |
197 | * @creator_id: identifier of creating driver | |
198 | * @cdrv: ccw driver of slave devices | |
022b660a UB |
199 | * @num_devices: number of slave devices |
200 | * @buf: buffer containing comma separated bus ids of slave devices | |
b2ffd8e9 CH |
201 | * |
202 | * Create and register a new ccw group device as a child of @root. Slave | |
022b660a | 203 | * devices are obtained from the list of bus ids given in @buf and must all |
b2ffd8e9 CH |
204 | * belong to @cdrv. |
205 | * Returns: | |
206 | * %0 on success and an error code on failure. | |
207 | * Context: | |
208 | * non-atomic | |
1da177e4 | 209 | */ |
022b660a UB |
210 | int ccwgroup_create_from_string(struct device *root, unsigned int creator_id, |
211 | struct ccw_driver *cdrv, int num_devices, | |
212 | const char *buf) | |
1da177e4 LT |
213 | { |
214 | struct ccwgroup_device *gdev; | |
022b660a UB |
215 | int rc, i; |
216 | char tmp_bus_id[BUS_ID_SIZE]; | |
217 | const char *curr_buf; | |
1da177e4 | 218 | |
022b660a UB |
219 | gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]), |
220 | GFP_KERNEL); | |
1da177e4 LT |
221 | if (!gdev) |
222 | return -ENOMEM; | |
223 | ||
1da177e4 | 224 | atomic_set(&gdev->onoff, 0); |
d76123eb CH |
225 | mutex_init(&gdev->reg_mutex); |
226 | mutex_lock(&gdev->reg_mutex); | |
16f7f956 PO |
227 | gdev->creator_id = creator_id; |
228 | gdev->count = num_devices; | |
229 | gdev->dev.bus = &ccwgroup_bus_type; | |
230 | gdev->dev.parent = root; | |
231 | gdev->dev.release = ccwgroup_release; | |
232 | device_initialize(&gdev->dev); | |
233 | ||
022b660a UB |
234 | curr_buf = buf; |
235 | for (i = 0; i < num_devices && curr_buf; i++) { | |
236 | rc = __get_next_bus_id(&curr_buf, tmp_bus_id); | |
237 | if (rc != 0) | |
238 | goto error; | |
239 | if (!__is_valid_bus_id(tmp_bus_id)) { | |
240 | rc = -EINVAL; | |
241 | goto error; | |
242 | } | |
243 | gdev->cdev[i] = get_ccwdev_by_busid(cdrv, tmp_bus_id); | |
244 | /* | |
245 | * All devices have to be of the same type in | |
246 | * order to be grouped. | |
247 | */ | |
1da177e4 LT |
248 | if (!gdev->cdev[i] |
249 | || gdev->cdev[i]->id.driver_info != | |
250 | gdev->cdev[0]->id.driver_info) { | |
251 | rc = -EINVAL; | |
d76123eb | 252 | goto error; |
1da177e4 LT |
253 | } |
254 | /* Don't allow a device to belong to more than one group. */ | |
db6a6423 | 255 | if (dev_get_drvdata(&gdev->cdev[i]->dev)) { |
1da177e4 | 256 | rc = -EINVAL; |
d76123eb | 257 | goto error; |
1da177e4 | 258 | } |
db6a6423 | 259 | dev_set_drvdata(&gdev->cdev[i]->dev, gdev); |
17088229 | 260 | } |
022b660a UB |
261 | /* Check for sufficient number of bus ids. */ |
262 | if (i < num_devices && !curr_buf) { | |
263 | rc = -EINVAL; | |
264 | goto error; | |
265 | } | |
266 | /* Check for trailing stuff. */ | |
267 | if (i == num_devices && strlen(curr_buf) > 0) { | |
268 | rc = -EINVAL; | |
269 | goto error; | |
270 | } | |
1da177e4 LT |
271 | |
272 | snprintf (gdev->dev.bus_id, BUS_ID_SIZE, "%s", | |
273 | gdev->cdev[0]->dev.bus_id); | |
274 | ||
16f7f956 | 275 | rc = device_add(&gdev->dev); |
1da177e4 | 276 | if (rc) |
d76123eb | 277 | goto error; |
1da177e4 LT |
278 | get_device(&gdev->dev); |
279 | rc = device_create_file(&gdev->dev, &dev_attr_ungroup); | |
280 | ||
281 | if (rc) { | |
282 | device_unregister(&gdev->dev); | |
283 | goto error; | |
284 | } | |
285 | ||
286 | rc = __ccwgroup_create_symlinks(gdev); | |
287 | if (!rc) { | |
d76123eb | 288 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
289 | put_device(&gdev->dev); |
290 | return 0; | |
291 | } | |
292 | device_remove_file(&gdev->dev, &dev_attr_ungroup); | |
293 | device_unregister(&gdev->dev); | |
294 | error: | |
022b660a | 295 | for (i = 0; i < num_devices; i++) |
1da177e4 | 296 | if (gdev->cdev[i]) { |
db6a6423 CH |
297 | if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev) |
298 | dev_set_drvdata(&gdev->cdev[i]->dev, NULL); | |
17088229 | 299 | put_device(&gdev->cdev[i]->dev); |
f26fd5d6 | 300 | gdev->cdev[i] = NULL; |
1da177e4 | 301 | } |
d76123eb CH |
302 | mutex_unlock(&gdev->reg_mutex); |
303 | put_device(&gdev->dev); | |
1da177e4 LT |
304 | return rc; |
305 | } | |
022b660a | 306 | EXPORT_SYMBOL(ccwgroup_create_from_string); |
1da177e4 LT |
307 | |
308 | static int __init | |
309 | init_ccwgroup (void) | |
310 | { | |
311 | return bus_register (&ccwgroup_bus_type); | |
312 | } | |
313 | ||
314 | static void __exit | |
315 | cleanup_ccwgroup (void) | |
316 | { | |
317 | bus_unregister (&ccwgroup_bus_type); | |
318 | } | |
319 | ||
320 | module_init(init_ccwgroup); | |
321 | module_exit(cleanup_ccwgroup); | |
322 | ||
323 | /************************** driver stuff ******************************/ | |
324 | ||
325 | static int | |
326 | ccwgroup_set_online(struct ccwgroup_device *gdev) | |
327 | { | |
328 | struct ccwgroup_driver *gdrv; | |
329 | int ret; | |
330 | ||
973bd993 | 331 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
1da177e4 LT |
332 | return -EAGAIN; |
333 | if (gdev->state == CCWGROUP_ONLINE) { | |
334 | ret = 0; | |
335 | goto out; | |
336 | } | |
337 | if (!gdev->dev.driver) { | |
338 | ret = -EINVAL; | |
339 | goto out; | |
340 | } | |
341 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
a0016408 | 342 | if ((ret = gdrv->set_online ? gdrv->set_online(gdev) : 0)) |
1da177e4 LT |
343 | goto out; |
344 | ||
345 | gdev->state = CCWGROUP_ONLINE; | |
346 | out: | |
347 | atomic_set(&gdev->onoff, 0); | |
348 | return ret; | |
349 | } | |
350 | ||
351 | static int | |
352 | ccwgroup_set_offline(struct ccwgroup_device *gdev) | |
353 | { | |
354 | struct ccwgroup_driver *gdrv; | |
355 | int ret; | |
356 | ||
973bd993 | 357 | if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0) |
1da177e4 LT |
358 | return -EAGAIN; |
359 | if (gdev->state == CCWGROUP_OFFLINE) { | |
360 | ret = 0; | |
361 | goto out; | |
362 | } | |
363 | if (!gdev->dev.driver) { | |
364 | ret = -EINVAL; | |
365 | goto out; | |
366 | } | |
367 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
a0016408 | 368 | if ((ret = gdrv->set_offline ? gdrv->set_offline(gdev) : 0)) |
1da177e4 LT |
369 | goto out; |
370 | ||
371 | gdev->state = CCWGROUP_OFFLINE; | |
372 | out: | |
373 | atomic_set(&gdev->onoff, 0); | |
374 | return ret; | |
375 | } | |
376 | ||
377 | static ssize_t | |
3fd3c0a5 | 378 | ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
379 | { |
380 | struct ccwgroup_device *gdev; | |
381 | struct ccwgroup_driver *gdrv; | |
2f972202 | 382 | unsigned long value; |
1da177e4 LT |
383 | int ret; |
384 | ||
385 | gdev = to_ccwgroupdev(dev); | |
386 | if (!dev->driver) | |
387 | return count; | |
388 | ||
389 | gdrv = to_ccwgroupdrv (gdev->dev.driver); | |
390 | if (!try_module_get(gdrv->owner)) | |
391 | return -EINVAL; | |
392 | ||
2f972202 CH |
393 | ret = strict_strtoul(buf, 0, &value); |
394 | if (ret) | |
395 | goto out; | |
1da177e4 LT |
396 | ret = count; |
397 | if (value == 1) | |
398 | ccwgroup_set_online(gdev); | |
399 | else if (value == 0) | |
400 | ccwgroup_set_offline(gdev); | |
401 | else | |
402 | ret = -EINVAL; | |
2f972202 | 403 | out: |
1da177e4 LT |
404 | module_put(gdrv->owner); |
405 | return ret; | |
406 | } | |
407 | ||
408 | static ssize_t | |
3fd3c0a5 | 409 | ccwgroup_online_show (struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
410 | { |
411 | int online; | |
412 | ||
413 | online = (to_ccwgroupdev(dev)->state == CCWGROUP_ONLINE); | |
414 | ||
415 | return sprintf(buf, online ? "1\n" : "0\n"); | |
416 | } | |
417 | ||
418 | static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store); | |
419 | ||
420 | static int | |
421 | ccwgroup_probe (struct device *dev) | |
422 | { | |
423 | struct ccwgroup_device *gdev; | |
424 | struct ccwgroup_driver *gdrv; | |
425 | ||
426 | int ret; | |
427 | ||
428 | gdev = to_ccwgroupdev(dev); | |
429 | gdrv = to_ccwgroupdrv(dev->driver); | |
430 | ||
431 | if ((ret = device_create_file(dev, &dev_attr_online))) | |
432 | return ret; | |
433 | ||
1da177e4 LT |
434 | ret = gdrv->probe ? gdrv->probe(gdev) : -ENODEV; |
435 | if (ret) | |
436 | device_remove_file(dev, &dev_attr_online); | |
437 | ||
438 | return ret; | |
439 | } | |
440 | ||
441 | static int | |
442 | ccwgroup_remove (struct device *dev) | |
443 | { | |
444 | struct ccwgroup_device *gdev; | |
445 | struct ccwgroup_driver *gdrv; | |
446 | ||
447 | gdev = to_ccwgroupdev(dev); | |
448 | gdrv = to_ccwgroupdrv(dev->driver); | |
449 | ||
1da177e4 LT |
450 | device_remove_file(dev, &dev_attr_online); |
451 | ||
452 | if (gdrv && gdrv->remove) | |
453 | gdrv->remove(gdev); | |
454 | return 0; | |
455 | } | |
456 | ||
01bc8ad1 CH |
457 | static void ccwgroup_shutdown(struct device *dev) |
458 | { | |
459 | struct ccwgroup_device *gdev; | |
460 | struct ccwgroup_driver *gdrv; | |
461 | ||
462 | gdev = to_ccwgroupdev(dev); | |
463 | gdrv = to_ccwgroupdrv(dev->driver); | |
464 | if (gdrv && gdrv->shutdown) | |
465 | gdrv->shutdown(gdev); | |
466 | } | |
467 | ||
f9ccf456 RK |
468 | static struct bus_type ccwgroup_bus_type = { |
469 | .name = "ccwgroup", | |
470 | .match = ccwgroup_bus_match, | |
471 | .uevent = ccwgroup_uevent, | |
472 | .probe = ccwgroup_probe, | |
473 | .remove = ccwgroup_remove, | |
01bc8ad1 | 474 | .shutdown = ccwgroup_shutdown, |
f9ccf456 RK |
475 | }; |
476 | ||
b2ffd8e9 CH |
477 | /** |
478 | * ccwgroup_driver_register() - register a ccw group driver | |
479 | * @cdriver: driver to be registered | |
480 | * | |
481 | * This function is mainly a wrapper around driver_register(). | |
482 | */ | |
483 | int ccwgroup_driver_register(struct ccwgroup_driver *cdriver) | |
1da177e4 LT |
484 | { |
485 | /* register our new driver with the core */ | |
292888c8 HC |
486 | cdriver->driver.bus = &ccwgroup_bus_type; |
487 | cdriver->driver.name = cdriver->name; | |
4beee646 | 488 | cdriver->driver.owner = cdriver->owner; |
1da177e4 LT |
489 | |
490 | return driver_register(&cdriver->driver); | |
491 | } | |
492 | ||
b0744bd2 | 493 | static int |
887ab599 | 494 | __ccwgroup_match_all(struct device *dev, void *data) |
1da177e4 | 495 | { |
887ab599 | 496 | return 1; |
1da177e4 LT |
497 | } |
498 | ||
b2ffd8e9 CH |
499 | /** |
500 | * ccwgroup_driver_unregister() - deregister a ccw group driver | |
501 | * @cdriver: driver to be deregistered | |
502 | * | |
503 | * This function is mainly a wrapper around driver_unregister(). | |
504 | */ | |
505 | void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver) | |
1da177e4 | 506 | { |
887ab599 CH |
507 | struct device *dev; |
508 | ||
1da177e4 LT |
509 | /* We don't want ccwgroup devices to live longer than their driver. */ |
510 | get_driver(&cdriver->driver); | |
887ab599 CH |
511 | while ((dev = driver_find_device(&cdriver->driver, NULL, NULL, |
512 | __ccwgroup_match_all))) { | |
d76123eb CH |
513 | struct ccwgroup_device *gdev = to_ccwgroupdev(dev); |
514 | ||
515 | mutex_lock(&gdev->reg_mutex); | |
516 | __ccwgroup_remove_symlinks(gdev); | |
887ab599 | 517 | device_unregister(dev); |
d76123eb | 518 | mutex_unlock(&gdev->reg_mutex); |
887ab599 CH |
519 | put_device(dev); |
520 | } | |
1da177e4 LT |
521 | put_driver(&cdriver->driver); |
522 | driver_unregister(&cdriver->driver); | |
523 | } | |
524 | ||
b2ffd8e9 CH |
525 | /** |
526 | * ccwgroup_probe_ccwdev() - probe function for slave devices | |
527 | * @cdev: ccw device to be probed | |
528 | * | |
529 | * This is a dummy probe function for ccw devices that are slave devices in | |
530 | * a ccw group device. | |
531 | * Returns: | |
532 | * always %0 | |
533 | */ | |
534 | int ccwgroup_probe_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
535 | { |
536 | return 0; | |
537 | } | |
538 | ||
4d284cac | 539 | static struct ccwgroup_device * |
1da177e4 LT |
540 | __ccwgroup_get_gdev_by_cdev(struct ccw_device *cdev) |
541 | { | |
542 | struct ccwgroup_device *gdev; | |
543 | ||
db6a6423 CH |
544 | gdev = dev_get_drvdata(&cdev->dev); |
545 | if (gdev) { | |
1da177e4 | 546 | if (get_device(&gdev->dev)) { |
d76123eb | 547 | mutex_lock(&gdev->reg_mutex); |
d305ef5d | 548 | if (device_is_registered(&gdev->dev)) |
1da177e4 | 549 | return gdev; |
d76123eb | 550 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
551 | put_device(&gdev->dev); |
552 | } | |
553 | return NULL; | |
554 | } | |
555 | return NULL; | |
556 | } | |
557 | ||
b2ffd8e9 CH |
558 | /** |
559 | * ccwgroup_remove_ccwdev() - remove function for slave devices | |
560 | * @cdev: ccw device to be removed | |
561 | * | |
562 | * This is a remove function for ccw devices that are slave devices in a ccw | |
563 | * group device. It sets the ccw device offline and also deregisters the | |
564 | * embedding ccw group device. | |
565 | */ | |
566 | void ccwgroup_remove_ccwdev(struct ccw_device *cdev) | |
1da177e4 LT |
567 | { |
568 | struct ccwgroup_device *gdev; | |
569 | ||
570 | /* Ignore offlining errors, device is gone anyway. */ | |
571 | ccw_device_set_offline(cdev); | |
572 | /* If one of its devices is gone, the whole group is done for. */ | |
573 | gdev = __ccwgroup_get_gdev_by_cdev(cdev); | |
574 | if (gdev) { | |
575 | __ccwgroup_remove_symlinks(gdev); | |
576 | device_unregister(&gdev->dev); | |
d76123eb | 577 | mutex_unlock(&gdev->reg_mutex); |
1da177e4 LT |
578 | put_device(&gdev->dev); |
579 | } | |
580 | } | |
581 | ||
582 | MODULE_LICENSE("GPL"); | |
583 | EXPORT_SYMBOL(ccwgroup_driver_register); | |
584 | EXPORT_SYMBOL(ccwgroup_driver_unregister); | |
1da177e4 LT |
585 | EXPORT_SYMBOL(ccwgroup_probe_ccwdev); |
586 | EXPORT_SYMBOL(ccwgroup_remove_ccwdev); |