Commit | Line | Data |
---|---|---|
c781c06d KH |
1 | /* |
2 | * Device probing and sysfs code. | |
19a15b93 KH |
3 | * |
4 | * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software Foundation, | |
18 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/kthread.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/delay.h> | |
a3aca3da | 27 | #include <linux/idr.h> |
3d36a0df | 28 | #include <linux/jiffies.h> |
c9755e14 | 29 | #include <linux/string.h> |
6188e10d MW |
30 | #include <linux/rwsem.h> |
31 | #include <linux/semaphore.h> | |
b5d2a5e0 | 32 | #include <asm/system.h> |
7feb9cce | 33 | #include <linux/ctype.h> |
19a15b93 KH |
34 | #include "fw-transaction.h" |
35 | #include "fw-topology.h" | |
36 | #include "fw-device.h" | |
37 | ||
38 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
39 | { | |
40 | ci->p = p + 1; | |
41 | ci->end = ci->p + (p[0] >> 16); | |
42 | } | |
19a15b93 KH |
43 | EXPORT_SYMBOL(fw_csr_iterator_init); |
44 | ||
45 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
46 | { | |
47 | *key = *ci->p >> 24; | |
48 | *value = *ci->p & 0xffffff; | |
49 | ||
50 | return ci->p++ < ci->end; | |
51 | } | |
19a15b93 KH |
52 | EXPORT_SYMBOL(fw_csr_iterator_next); |
53 | ||
54 | static int is_fw_unit(struct device *dev); | |
55 | ||
21ebcd12 | 56 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
57 | { |
58 | struct fw_csr_iterator ci; | |
59 | int key, value, match; | |
60 | ||
61 | match = 0; | |
62 | fw_csr_iterator_init(&ci, directory); | |
63 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
64 | if (key == CSR_VENDOR && value == id->vendor) | |
65 | match |= FW_MATCH_VENDOR; | |
66 | if (key == CSR_MODEL && value == id->model) | |
67 | match |= FW_MATCH_MODEL; | |
68 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
69 | match |= FW_MATCH_SPECIFIER_ID; | |
70 | if (key == CSR_VERSION && value == id->version) | |
71 | match |= FW_MATCH_VERSION; | |
72 | } | |
73 | ||
74 | return (match & id->match_flags) == id->match_flags; | |
75 | } | |
76 | ||
77 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
78 | { | |
79 | struct fw_unit *unit = fw_unit(dev); | |
80 | struct fw_driver *driver = fw_driver(drv); | |
81 | int i; | |
82 | ||
83 | /* We only allow binding to fw_units. */ | |
84 | if (!is_fw_unit(dev)) | |
85 | return 0; | |
86 | ||
87 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
88 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
89 | return 1; | |
90 | } | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
96 | { | |
97 | struct fw_device *device = fw_device(unit->device.parent); | |
98 | struct fw_csr_iterator ci; | |
99 | ||
100 | int key, value; | |
101 | int vendor = 0; | |
102 | int model = 0; | |
103 | int specifier_id = 0; | |
104 | int version = 0; | |
105 | ||
106 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
107 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
108 | switch (key) { | |
109 | case CSR_VENDOR: | |
110 | vendor = value; | |
111 | break; | |
112 | case CSR_MODEL: | |
113 | model = value; | |
114 | break; | |
115 | } | |
116 | } | |
117 | ||
118 | fw_csr_iterator_init(&ci, unit->directory); | |
119 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
120 | switch (key) { | |
121 | case CSR_SPECIFIER_ID: | |
122 | specifier_id = value; | |
123 | break; | |
124 | case CSR_VERSION: | |
125 | version = value; | |
126 | break; | |
127 | } | |
128 | } | |
129 | ||
130 | return snprintf(buffer, buffer_size, | |
131 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
132 | vendor, model, specifier_id, version); | |
133 | } | |
134 | ||
135 | static int | |
7eff2e7a | 136 | fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
137 | { |
138 | struct fw_unit *unit = fw_unit(dev); | |
139 | char modalias[64]; | |
19a15b93 | 140 | |
2d826cc5 | 141 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 142 | |
7eff2e7a | 143 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
144 | return -ENOMEM; |
145 | ||
19a15b93 KH |
146 | return 0; |
147 | } | |
148 | ||
149 | struct bus_type fw_bus_type = { | |
362c2c8c | 150 | .name = "firewire", |
19a15b93 | 151 | .match = fw_unit_match, |
19a15b93 | 152 | }; |
19a15b93 KH |
153 | EXPORT_SYMBOL(fw_bus_type); |
154 | ||
19a15b93 KH |
155 | static void fw_device_release(struct device *dev) |
156 | { | |
157 | struct fw_device *device = fw_device(dev); | |
855c603d | 158 | struct fw_card *card = device->card; |
19a15b93 KH |
159 | unsigned long flags; |
160 | ||
c781c06d KH |
161 | /* |
162 | * Take the card lock so we don't set this to NULL while a | |
62305823 SR |
163 | * FW_NODE_UPDATED callback is being handled or while the |
164 | * bus manager work looks at this node. | |
c781c06d | 165 | */ |
c9755e14 | 166 | spin_lock_irqsave(&card->lock, flags); |
19a15b93 | 167 | device->node->data = NULL; |
c9755e14 | 168 | spin_unlock_irqrestore(&card->lock, flags); |
19a15b93 KH |
169 | |
170 | fw_node_put(device->node); | |
19a15b93 KH |
171 | kfree(device->config_rom); |
172 | kfree(device); | |
459f7923 | 173 | fw_card_put(card); |
19a15b93 KH |
174 | } |
175 | ||
176 | int fw_device_enable_phys_dma(struct fw_device *device) | |
177 | { | |
b5d2a5e0 SR |
178 | int generation = device->generation; |
179 | ||
180 | /* device->node_id, accessed below, must not be older than generation */ | |
181 | smp_rmb(); | |
182 | ||
19a15b93 KH |
183 | return device->card->driver->enable_phys_dma(device->card, |
184 | device->node_id, | |
b5d2a5e0 | 185 | generation); |
19a15b93 | 186 | } |
19a15b93 KH |
187 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
188 | ||
7feb9cce KH |
189 | struct config_rom_attribute { |
190 | struct device_attribute attr; | |
191 | u32 key; | |
192 | }; | |
193 | ||
194 | static ssize_t | |
195 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
196 | { | |
197 | struct config_rom_attribute *attr = | |
198 | container_of(dattr, struct config_rom_attribute, attr); | |
199 | struct fw_csr_iterator ci; | |
200 | u32 *dir; | |
c9755e14 SR |
201 | int key, value, ret = -ENOENT; |
202 | ||
203 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
204 | |
205 | if (is_fw_unit(dev)) | |
206 | dir = fw_unit(dev)->directory; | |
207 | else | |
208 | dir = fw_device(dev)->config_rom + 5; | |
209 | ||
210 | fw_csr_iterator_init(&ci, dir); | |
211 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
212 | if (attr->key == key) { |
213 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
214 | "0x%06x\n", value); | |
215 | break; | |
216 | } | |
217 | ||
218 | up_read(&fw_device_rwsem); | |
7feb9cce | 219 | |
c9755e14 | 220 | return ret; |
7feb9cce KH |
221 | } |
222 | ||
223 | #define IMMEDIATE_ATTR(name, key) \ | |
224 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
225 | ||
226 | static ssize_t | |
227 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
228 | { | |
229 | struct config_rom_attribute *attr = | |
230 | container_of(dattr, struct config_rom_attribute, attr); | |
231 | struct fw_csr_iterator ci; | |
232 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 233 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
234 | char *b; |
235 | ||
c9755e14 SR |
236 | down_read(&fw_device_rwsem); |
237 | ||
7feb9cce KH |
238 | if (is_fw_unit(dev)) |
239 | dir = fw_unit(dev)->directory; | |
240 | else | |
241 | dir = fw_device(dev)->config_rom + 5; | |
242 | ||
243 | fw_csr_iterator_init(&ci, dir); | |
244 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
245 | if (attr->key == last_key && | |
246 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
247 | block = ci.p - 1 + value; | |
248 | last_key = key; | |
249 | } | |
250 | ||
251 | if (block == NULL) | |
c9755e14 | 252 | goto out; |
7feb9cce KH |
253 | |
254 | length = min(block[0] >> 16, 256U); | |
255 | if (length < 3) | |
c9755e14 | 256 | goto out; |
7feb9cce KH |
257 | |
258 | if (block[1] != 0 || block[2] != 0) | |
259 | /* Unknown encoding. */ | |
c9755e14 | 260 | goto out; |
7feb9cce | 261 | |
c9755e14 SR |
262 | if (buf == NULL) { |
263 | ret = length * 4; | |
264 | goto out; | |
265 | } | |
7feb9cce KH |
266 | |
267 | b = buf; | |
268 | end = &block[length + 1]; | |
269 | for (p = &block[3]; p < end; p++, b += 4) | |
270 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
271 | ||
272 | /* Strip trailing whitespace and add newline. */ | |
273 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
274 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
275 | ret = b + 2 - buf; |
276 | out: | |
277 | up_read(&fw_device_rwsem); | |
7feb9cce | 278 | |
c9755e14 | 279 | return ret; |
7feb9cce KH |
280 | } |
281 | ||
282 | #define TEXT_LEAF_ATTR(name, key) \ | |
283 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
284 | ||
285 | static struct config_rom_attribute config_rom_attributes[] = { | |
286 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
287 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
288 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
289 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
290 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
291 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
292 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
293 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
294 | }; | |
295 | ||
296 | static void | |
6f2e53d5 KH |
297 | init_fw_attribute_group(struct device *dev, |
298 | struct device_attribute *attrs, | |
299 | struct fw_attribute_group *group) | |
7feb9cce KH |
300 | { |
301 | struct device_attribute *attr; | |
6f2e53d5 KH |
302 | int i, j; |
303 | ||
304 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
305 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
306 | |
307 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
308 | attr = &config_rom_attributes[i].attr; | |
309 | if (attr->show(dev, attr, NULL) < 0) | |
310 | continue; | |
6f2e53d5 | 311 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
312 | } |
313 | ||
6f2e53d5 KH |
314 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
315 | group->attrs[j++] = NULL; | |
316 | group->groups[0] = &group->group; | |
317 | group->groups[1] = NULL; | |
318 | group->group.attrs = group->attrs; | |
319 | dev->groups = group->groups; | |
7feb9cce KH |
320 | } |
321 | ||
19a15b93 | 322 | static ssize_t |
21351dbe KH |
323 | modalias_show(struct device *dev, |
324 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
325 | { |
326 | struct fw_unit *unit = fw_unit(dev); | |
327 | int length; | |
328 | ||
329 | length = get_modalias(unit, buf, PAGE_SIZE); | |
330 | strcpy(buf + length, "\n"); | |
331 | ||
332 | return length + 1; | |
333 | } | |
334 | ||
19a15b93 | 335 | static ssize_t |
21351dbe KH |
336 | rom_index_show(struct device *dev, |
337 | struct device_attribute *attr, char *buf) | |
19a15b93 | 338 | { |
21351dbe KH |
339 | struct fw_device *device = fw_device(dev->parent); |
340 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 341 | |
21351dbe KH |
342 | return snprintf(buf, PAGE_SIZE, "%d\n", |
343 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
344 | } |
345 | ||
21351dbe KH |
346 | static struct device_attribute fw_unit_attributes[] = { |
347 | __ATTR_RO(modalias), | |
348 | __ATTR_RO(rom_index), | |
349 | __ATTR_NULL, | |
19a15b93 KH |
350 | }; |
351 | ||
048961ef | 352 | static ssize_t |
bbd14945 | 353 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 354 | { |
21351dbe | 355 | struct fw_device *device = fw_device(dev); |
c9755e14 | 356 | size_t length; |
048961ef | 357 | |
c9755e14 SR |
358 | down_read(&fw_device_rwsem); |
359 | length = device->config_rom_length * 4; | |
360 | memcpy(buf, device->config_rom, length); | |
361 | up_read(&fw_device_rwsem); | |
21351dbe | 362 | |
c9755e14 | 363 | return length; |
048961ef KH |
364 | } |
365 | ||
bbd14945 KH |
366 | static ssize_t |
367 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
368 | { | |
369 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
370 | int ret; |
371 | ||
372 | down_read(&fw_device_rwsem); | |
373 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
374 | device->config_rom[3], device->config_rom[4]); | |
375 | up_read(&fw_device_rwsem); | |
bbd14945 | 376 | |
c9755e14 | 377 | return ret; |
bbd14945 KH |
378 | } |
379 | ||
21351dbe KH |
380 | static struct device_attribute fw_device_attributes[] = { |
381 | __ATTR_RO(config_rom), | |
bbd14945 | 382 | __ATTR_RO(guid), |
21351dbe | 383 | __ATTR_NULL, |
048961ef KH |
384 | }; |
385 | ||
f8d2dc39 SR |
386 | static int |
387 | read_rom(struct fw_device *device, int generation, int index, u32 *data) | |
19a15b93 | 388 | { |
1e119fa9 | 389 | int rcode; |
b5d2a5e0 SR |
390 | |
391 | /* device->node_id, accessed below, must not be older than generation */ | |
392 | smp_rmb(); | |
19a15b93 | 393 | |
1e119fa9 | 394 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 395 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
396 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
397 | data, 4); | |
398 | be32_to_cpus(data); | |
19a15b93 | 399 | |
1e119fa9 | 400 | return rcode; |
19a15b93 KH |
401 | } |
402 | ||
1dadff71 SR |
403 | #define READ_BIB_ROM_SIZE 256 |
404 | #define READ_BIB_STACK_SIZE 16 | |
405 | ||
f8d2dc39 SR |
406 | /* |
407 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
408 | * the config ROM. We do all this with a cached bus generation. If the bus | |
409 | * generation changes under us, read_bus_info_block will fail and get retried. | |
410 | * It's better to start all over in this case because the node from which we | |
411 | * are reading the ROM may have changed the ROM during the reset. | |
412 | */ | |
413 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 414 | { |
c9755e14 | 415 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
416 | u32 sp, key; |
417 | int i, end, length, ret = -1; | |
418 | ||
419 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
420 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
421 | if (rom == NULL) | |
422 | return -ENOMEM; | |
423 | ||
424 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 425 | |
f1397490 SR |
426 | device->max_speed = SCODE_100; |
427 | ||
19a15b93 KH |
428 | /* First read the bus info block. */ |
429 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 430 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 431 | goto out; |
c781c06d KH |
432 | /* |
433 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
434 | * reply with a 0 for the first quadlet of the config |
435 | * rom to indicate that they are booting (for example, | |
436 | * if the firmware is on the disk of a external | |
437 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
438 | * retry mechanism will try again later. |
439 | */ | |
19a15b93 | 440 | if (i == 0 && rom[i] == 0) |
1dadff71 | 441 | goto out; |
19a15b93 KH |
442 | } |
443 | ||
f1397490 SR |
444 | device->max_speed = device->node->max_speed; |
445 | ||
446 | /* | |
447 | * Determine the speed of | |
448 | * - devices with link speed less than PHY speed, | |
449 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
450 | * - all devices if there are 1394b repeaters. | |
451 | * Note, we cannot use the bus info block's link_spd as starting point | |
452 | * because some buggy firmwares set it lower than necessary and because | |
453 | * 1394-1995 nodes do not have the field. | |
454 | */ | |
455 | if ((rom[2] & 0x7) < device->max_speed || | |
456 | device->max_speed == SCODE_BETA || | |
457 | device->card->beta_repeaters_present) { | |
458 | u32 dummy; | |
459 | ||
460 | /* for S1600 and S3200 */ | |
461 | if (device->max_speed == SCODE_BETA) | |
462 | device->max_speed = device->card->link_speed; | |
463 | ||
464 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
465 | if (read_rom(device, generation, 0, &dummy) == |
466 | RCODE_COMPLETE) | |
f1397490 SR |
467 | break; |
468 | device->max_speed--; | |
469 | } | |
470 | } | |
471 | ||
c781c06d KH |
472 | /* |
473 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
474 | * directory structure so we parse it using a stack of |
475 | * references to the blocks that make up the structure. We | |
476 | * push a reference to the root directory on the stack to | |
c781c06d KH |
477 | * start things off. |
478 | */ | |
19a15b93 KH |
479 | length = i; |
480 | sp = 0; | |
481 | stack[sp++] = 0xc0000005; | |
482 | while (sp > 0) { | |
c781c06d KH |
483 | /* |
484 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
485 | * lower 24 bits is the offset into the config rom, |
486 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
487 | * block. |
488 | */ | |
19a15b93 KH |
489 | key = stack[--sp]; |
490 | i = key & 0xffffff; | |
1dadff71 | 491 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
492 | /* |
493 | * The reference points outside the standard | |
494 | * config rom area, something's fishy. | |
495 | */ | |
1dadff71 | 496 | goto out; |
19a15b93 KH |
497 | |
498 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 499 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 500 | goto out; |
19a15b93 KH |
501 | end = i + (rom[i] >> 16) + 1; |
502 | i++; | |
1dadff71 | 503 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
504 | /* |
505 | * This block extends outside standard config | |
19a15b93 KH |
506 | * area (and the array we're reading it |
507 | * into). That's broken, so ignore this | |
c781c06d KH |
508 | * device. |
509 | */ | |
1dadff71 | 510 | goto out; |
19a15b93 | 511 | |
c781c06d KH |
512 | /* |
513 | * Now read in the block. If this is a directory | |
19a15b93 | 514 | * block, check the entries as we read them to see if |
c781c06d KH |
515 | * it references another block, and push it in that case. |
516 | */ | |
19a15b93 | 517 | while (i < end) { |
f8d2dc39 SR |
518 | if (read_rom(device, generation, i, &rom[i]) != |
519 | RCODE_COMPLETE) | |
1dadff71 | 520 | goto out; |
19a15b93 | 521 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 522 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
523 | stack[sp++] = i + rom[i]; |
524 | i++; | |
525 | } | |
526 | if (length < i) | |
527 | length = i; | |
528 | } | |
529 | ||
c9755e14 SR |
530 | old_rom = device->config_rom; |
531 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
532 | if (new_rom == NULL) | |
1dadff71 | 533 | goto out; |
c9755e14 SR |
534 | |
535 | down_write(&fw_device_rwsem); | |
536 | device->config_rom = new_rom; | |
19a15b93 | 537 | device->config_rom_length = length; |
c9755e14 SR |
538 | up_write(&fw_device_rwsem); |
539 | ||
540 | kfree(old_rom); | |
1dadff71 | 541 | ret = 0; |
c9755e14 | 542 | device->cmc = rom[2] & 1 << 30; |
1dadff71 SR |
543 | out: |
544 | kfree(rom); | |
19a15b93 | 545 | |
1dadff71 | 546 | return ret; |
19a15b93 KH |
547 | } |
548 | ||
549 | static void fw_unit_release(struct device *dev) | |
550 | { | |
551 | struct fw_unit *unit = fw_unit(dev); | |
552 | ||
553 | kfree(unit); | |
554 | } | |
555 | ||
21351dbe | 556 | static struct device_type fw_unit_type = { |
21351dbe KH |
557 | .uevent = fw_unit_uevent, |
558 | .release = fw_unit_release, | |
559 | }; | |
560 | ||
19a15b93 KH |
561 | static int is_fw_unit(struct device *dev) |
562 | { | |
21351dbe | 563 | return dev->type == &fw_unit_type; |
19a15b93 KH |
564 | } |
565 | ||
566 | static void create_units(struct fw_device *device) | |
567 | { | |
568 | struct fw_csr_iterator ci; | |
569 | struct fw_unit *unit; | |
570 | int key, value, i; | |
571 | ||
572 | i = 0; | |
573 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
574 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
575 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
576 | continue; | |
577 | ||
c781c06d KH |
578 | /* |
579 | * Get the address of the unit directory and try to | |
580 | * match the drivers id_tables against it. | |
581 | */ | |
2d826cc5 | 582 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
583 | if (unit == NULL) { |
584 | fw_error("failed to allocate memory for unit\n"); | |
585 | continue; | |
586 | } | |
587 | ||
588 | unit->directory = ci.p + value - 1; | |
589 | unit->device.bus = &fw_bus_type; | |
21351dbe | 590 | unit->device.type = &fw_unit_type; |
19a15b93 | 591 | unit->device.parent = &device->device; |
a1f64819 | 592 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 593 | |
6f2e53d5 KH |
594 | init_fw_attribute_group(&unit->device, |
595 | fw_unit_attributes, | |
596 | &unit->attribute_group); | |
7feb9cce KH |
597 | if (device_register(&unit->device) < 0) |
598 | goto skip_unit; | |
599 | ||
7feb9cce KH |
600 | continue; |
601 | ||
7feb9cce KH |
602 | skip_unit: |
603 | kfree(unit); | |
19a15b93 KH |
604 | } |
605 | } | |
606 | ||
607 | static int shutdown_unit(struct device *device, void *data) | |
608 | { | |
21351dbe | 609 | device_unregister(device); |
19a15b93 KH |
610 | |
611 | return 0; | |
612 | } | |
613 | ||
c9755e14 SR |
614 | /* |
615 | * fw_device_rwsem acts as dual purpose mutex: | |
616 | * - serializes accesses to fw_device_idr, | |
617 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
618 | * fw_unit.directory, unless those accesses happen at safe occasions | |
619 | */ | |
620 | DECLARE_RWSEM(fw_device_rwsem); | |
621 | ||
d6053e08 | 622 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
623 | int fw_cdev_major; |
624 | ||
96b19062 | 625 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
626 | { |
627 | struct fw_device *device; | |
628 | ||
c9755e14 | 629 | down_read(&fw_device_rwsem); |
a3aca3da | 630 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
631 | if (device) |
632 | fw_device_get(device); | |
c9755e14 | 633 | up_read(&fw_device_rwsem); |
a3aca3da KH |
634 | |
635 | return device; | |
636 | } | |
637 | ||
3d36a0df SR |
638 | /* |
639 | * These defines control the retry behavior for reading the config | |
640 | * rom. It shouldn't be necessary to tweak these; if the device | |
641 | * doesn't respond to a config rom read within 10 seconds, it's not | |
642 | * going to respond at all. As for the initial delay, a lot of | |
643 | * devices will be able to respond within half a second after bus | |
644 | * reset. On the other hand, it's not really worth being more | |
645 | * aggressive than that, since it scales pretty well; if 10 devices | |
646 | * are plugged in, they're all getting read within one second. | |
647 | */ | |
648 | ||
649 | #define MAX_RETRIES 10 | |
650 | #define RETRY_DELAY (3 * HZ) | |
651 | #define INITIAL_DELAY (HZ / 2) | |
652 | #define SHUTDOWN_DELAY (2 * HZ) | |
653 | ||
19a15b93 KH |
654 | static void fw_device_shutdown(struct work_struct *work) |
655 | { | |
656 | struct fw_device *device = | |
657 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
658 | int minor = MINOR(device->device.devt); |
659 | ||
e747a5c0 SR |
660 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
661 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
662 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
663 | return; | |
664 | } | |
665 | ||
666 | if (atomic_cmpxchg(&device->state, | |
667 | FW_DEVICE_GONE, | |
668 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
669 | return; | |
670 | ||
2603bf21 | 671 | fw_device_cdev_remove(device); |
19a15b93 KH |
672 | device_for_each_child(&device->device, NULL, shutdown_unit); |
673 | device_unregister(&device->device); | |
96b19062 | 674 | |
c9755e14 | 675 | down_write(&fw_device_rwsem); |
96b19062 | 676 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 677 | up_write(&fw_device_rwsem); |
3d36a0df | 678 | |
96b19062 | 679 | fw_device_put(device); |
19a15b93 KH |
680 | } |
681 | ||
21351dbe | 682 | static struct device_type fw_device_type = { |
21351dbe KH |
683 | .release = fw_device_release, |
684 | }; | |
685 | ||
3d36a0df SR |
686 | static void fw_device_update(struct work_struct *work); |
687 | ||
c781c06d | 688 | /* |
3d36a0df SR |
689 | * If a device was pending for deletion because its node went away but its |
690 | * bus info block and root directory header matches that of a newly discovered | |
691 | * device, revive the existing fw_device. | |
692 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 693 | */ |
3d36a0df SR |
694 | static int lookup_existing_device(struct device *dev, void *data) |
695 | { | |
696 | struct fw_device *old = fw_device(dev); | |
697 | struct fw_device *new = data; | |
698 | struct fw_card *card = new->card; | |
699 | int match = 0; | |
700 | ||
701 | down_read(&fw_device_rwsem); /* serialize config_rom access */ | |
702 | spin_lock_irq(&card->lock); /* serialize node access */ | |
703 | ||
704 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
705 | atomic_cmpxchg(&old->state, | |
706 | FW_DEVICE_GONE, | |
707 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
708 | struct fw_node *current_node = new->node; | |
709 | struct fw_node *obsolete_node = old->node; | |
710 | ||
711 | new->node = obsolete_node; | |
712 | new->node->data = new; | |
713 | old->node = current_node; | |
714 | old->node->data = old; | |
715 | ||
716 | old->max_speed = new->max_speed; | |
717 | old->node_id = current_node->node_id; | |
718 | smp_wmb(); /* update node_id before generation */ | |
719 | old->generation = card->generation; | |
720 | old->config_rom_retries = 0; | |
721 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 722 | |
3d36a0df SR |
723 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
724 | schedule_delayed_work(&old->work, 0); | |
725 | ||
726 | if (current_node == card->root_node) | |
727 | fw_schedule_bm_work(card, 0); | |
728 | ||
729 | match = 1; | |
730 | } | |
731 | ||
732 | spin_unlock_irq(&card->lock); | |
733 | up_read(&fw_device_rwsem); | |
734 | ||
735 | return match; | |
736 | } | |
19a15b93 KH |
737 | |
738 | static void fw_device_init(struct work_struct *work) | |
739 | { | |
19a15b93 KH |
740 | struct fw_device *device = |
741 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 742 | struct device *revived_dev; |
a3aca3da | 743 | int minor, err; |
19a15b93 | 744 | |
c781c06d KH |
745 | /* |
746 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 747 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
748 | * device. |
749 | */ | |
19a15b93 | 750 | |
f8d2dc39 | 751 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
752 | if (device->config_rom_retries < MAX_RETRIES && |
753 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
754 | device->config_rom_retries++; |
755 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
756 | } else { | |
907293d7 | 757 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 758 | device->node_id); |
931c4834 | 759 | if (device->node == device->card->root_node) |
0fa1986f | 760 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
761 | fw_device_release(&device->device); |
762 | } | |
763 | return; | |
764 | } | |
765 | ||
3d36a0df SR |
766 | revived_dev = device_find_child(device->card->device, |
767 | device, lookup_existing_device); | |
768 | if (revived_dev) { | |
769 | put_device(revived_dev); | |
770 | fw_device_release(&device->device); | |
771 | ||
772 | return; | |
773 | } | |
774 | ||
62305823 | 775 | device_initialize(&device->device); |
96b19062 SR |
776 | |
777 | fw_device_get(device); | |
c9755e14 | 778 | down_write(&fw_device_rwsem); |
62305823 SR |
779 | err = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
780 | idr_get_new(&fw_device_idr, device, &minor) : | |
781 | -ENOMEM; | |
c9755e14 | 782 | up_write(&fw_device_rwsem); |
96b19062 | 783 | |
a3aca3da KH |
784 | if (err < 0) |
785 | goto error; | |
786 | ||
19a15b93 | 787 | device->device.bus = &fw_bus_type; |
21351dbe | 788 | device->device.type = &fw_device_type; |
19a15b93 | 789 | device->device.parent = device->card->device; |
a3aca3da | 790 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 791 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 792 | |
6f2e53d5 KH |
793 | init_fw_attribute_group(&device->device, |
794 | fw_device_attributes, | |
795 | &device->attribute_group); | |
19a15b93 KH |
796 | if (device_add(&device->device)) { |
797 | fw_error("Failed to add device.\n"); | |
a3aca3da | 798 | goto error_with_cdev; |
19a15b93 KH |
799 | } |
800 | ||
19a15b93 KH |
801 | create_units(device); |
802 | ||
c781c06d KH |
803 | /* |
804 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
805 | * out from under us while we did the intialization work, we |
806 | * have to shut down the device again here. Normally, though, | |
807 | * fw_node_event will be responsible for shutting it down when | |
808 | * necessary. We have to use the atomic cmpxchg here to avoid | |
809 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
810 | * fw_node_event(). |
811 | */ | |
641f8791 | 812 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
813 | FW_DEVICE_INITIALIZING, |
814 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
815 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
816 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
817 | } else { |
818 | if (device->config_rom_retries) | |
819 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
820 | "%d config ROM retries\n", | |
a1f64819 | 821 | dev_name(&device->device), |
fa6e697b SR |
822 | device->config_rom[3], device->config_rom[4], |
823 | 1 << device->max_speed, | |
824 | device->config_rom_retries); | |
825 | else | |
826 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 827 | dev_name(&device->device), |
fa6e697b SR |
828 | device->config_rom[3], device->config_rom[4], |
829 | 1 << device->max_speed); | |
c9755e14 | 830 | device->config_rom_retries = 0; |
fa6e697b | 831 | } |
19a15b93 | 832 | |
c781c06d KH |
833 | /* |
834 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
835 | * root node config rom. If this races with a bus reset we |
836 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
837 | * pretty harmless. |
838 | */ | |
19a15b93 | 839 | if (device->node == device->card->root_node) |
0fa1986f | 840 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
841 | |
842 | return; | |
843 | ||
a3aca3da | 844 | error_with_cdev: |
c9755e14 | 845 | down_write(&fw_device_rwsem); |
a3aca3da | 846 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 847 | up_write(&fw_device_rwsem); |
373b2edd | 848 | error: |
96b19062 SR |
849 | fw_device_put(device); /* fw_device_idr's reference */ |
850 | ||
851 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
852 | } |
853 | ||
854 | static int update_unit(struct device *dev, void *data) | |
855 | { | |
856 | struct fw_unit *unit = fw_unit(dev); | |
857 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
858 | ||
015b066f KH |
859 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
860 | down(&dev->sem); | |
19a15b93 | 861 | driver->update(unit); |
015b066f KH |
862 | up(&dev->sem); |
863 | } | |
19a15b93 KH |
864 | |
865 | return 0; | |
866 | } | |
867 | ||
5f480477 KH |
868 | static void fw_device_update(struct work_struct *work) |
869 | { | |
870 | struct fw_device *device = | |
871 | container_of(work, struct fw_device, work.work); | |
872 | ||
97bd9efa | 873 | fw_device_cdev_update(device); |
5f480477 KH |
874 | device_for_each_child(&device->device, NULL, update_unit); |
875 | } | |
876 | ||
c9755e14 SR |
877 | enum { |
878 | REREAD_BIB_ERROR, | |
879 | REREAD_BIB_GONE, | |
880 | REREAD_BIB_UNCHANGED, | |
881 | REREAD_BIB_CHANGED, | |
882 | }; | |
883 | ||
884 | /* Reread and compare bus info block and header of root directory */ | |
885 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
886 | { | |
887 | u32 q; | |
888 | int i; | |
889 | ||
890 | for (i = 0; i < 6; i++) { | |
891 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
892 | return REREAD_BIB_ERROR; | |
893 | ||
894 | if (i == 0 && q == 0) | |
895 | return REREAD_BIB_GONE; | |
896 | ||
897 | if (i > device->config_rom_length || q != device->config_rom[i]) | |
898 | return REREAD_BIB_CHANGED; | |
899 | } | |
900 | ||
901 | return REREAD_BIB_UNCHANGED; | |
902 | } | |
903 | ||
904 | static void fw_device_refresh(struct work_struct *work) | |
905 | { | |
906 | struct fw_device *device = | |
907 | container_of(work, struct fw_device, work.work); | |
908 | struct fw_card *card = device->card; | |
909 | int node_id = device->node_id; | |
910 | ||
911 | switch (reread_bus_info_block(device, device->generation)) { | |
912 | case REREAD_BIB_ERROR: | |
913 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
914 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
915 | device->config_rom_retries++; | |
916 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
917 | ||
918 | return; | |
919 | } | |
920 | goto give_up; | |
921 | ||
922 | case REREAD_BIB_GONE: | |
923 | goto gone; | |
924 | ||
925 | case REREAD_BIB_UNCHANGED: | |
926 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
927 | FW_DEVICE_INITIALIZING, |
928 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
929 | goto gone; |
930 | ||
931 | fw_device_update(work); | |
932 | device->config_rom_retries = 0; | |
933 | goto out; | |
934 | ||
935 | case REREAD_BIB_CHANGED: | |
936 | break; | |
937 | } | |
938 | ||
939 | /* | |
940 | * Something changed. We keep things simple and don't investigate | |
941 | * further. We just destroy all previous units and create new ones. | |
942 | */ | |
943 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
944 | ||
945 | if (read_bus_info_block(device, device->generation) < 0) { | |
946 | if (device->config_rom_retries < MAX_RETRIES && | |
947 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
948 | device->config_rom_retries++; | |
949 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
950 | ||
951 | return; | |
952 | } | |
953 | goto give_up; | |
954 | } | |
955 | ||
956 | create_units(device); | |
957 | ||
958 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
959 | FW_DEVICE_INITIALIZING, |
960 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
961 | goto gone; |
962 | ||
a1f64819 | 963 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
964 | device->config_rom_retries = 0; |
965 | goto out; | |
966 | ||
967 | give_up: | |
a1f64819 | 968 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 969 | gone: |
3d36a0df SR |
970 | atomic_set(&device->state, FW_DEVICE_GONE); |
971 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
972 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
973 | out: |
974 | if (node_id == card->root_node->node_id) | |
0fa1986f | 975 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
976 | } |
977 | ||
19a15b93 KH |
978 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
979 | { | |
980 | struct fw_device *device; | |
981 | ||
19a15b93 KH |
982 | switch (event) { |
983 | case FW_NODE_CREATED: | |
984 | case FW_NODE_LINK_ON: | |
985 | if (!node->link_on) | |
986 | break; | |
c9755e14 | 987 | create: |
19a15b93 KH |
988 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
989 | if (device == NULL) | |
990 | break; | |
991 | ||
c781c06d KH |
992 | /* |
993 | * Do minimal intialization of the device here, the | |
62305823 SR |
994 | * rest will happen in fw_device_init(). |
995 | * | |
996 | * Attention: A lot of things, even fw_device_get(), | |
997 | * cannot be done before fw_device_init() finished! | |
998 | * You can basically just check device->state and | |
999 | * schedule work until then, but only while holding | |
1000 | * card->lock. | |
c781c06d | 1001 | */ |
641f8791 | 1002 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1003 | device->card = fw_card_get(card); |
19a15b93 KH |
1004 | device->node = fw_node_get(node); |
1005 | device->node_id = node->node_id; | |
1006 | device->generation = card->generation; | |
97bd9efa | 1007 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1008 | |
c781c06d KH |
1009 | /* |
1010 | * Set the node data to point back to this device so | |
19a15b93 | 1011 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1012 | * and generation for the device. |
1013 | */ | |
19a15b93 KH |
1014 | node->data = device; |
1015 | ||
c781c06d KH |
1016 | /* |
1017 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1018 | * especially if they are bus powered and go through |
1019 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1020 | * first config rom scan half a second after bus reset. |
1021 | */ | |
19a15b93 KH |
1022 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1023 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1024 | break; | |
1025 | ||
c9755e14 SR |
1026 | case FW_NODE_INITIATED_RESET: |
1027 | device = node->data; | |
1028 | if (device == NULL) | |
1029 | goto create; | |
1030 | ||
1031 | device->node_id = node->node_id; | |
1032 | smp_wmb(); /* update node_id before generation */ | |
1033 | device->generation = card->generation; | |
1034 | if (atomic_cmpxchg(&device->state, | |
1035 | FW_DEVICE_RUNNING, | |
1036 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1037 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1038 | schedule_delayed_work(&device->work, | |
1039 | node == card->local_node ? 0 : INITIAL_DELAY); | |
1040 | } | |
1041 | break; | |
1042 | ||
19a15b93 KH |
1043 | case FW_NODE_UPDATED: |
1044 | if (!node->link_on || node->data == NULL) | |
1045 | break; | |
1046 | ||
1047 | device = node->data; | |
1048 | device->node_id = node->node_id; | |
b5d2a5e0 | 1049 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1050 | device->generation = card->generation; |
5f480477 KH |
1051 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1052 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1053 | schedule_delayed_work(&device->work, 0); | |
1054 | } | |
19a15b93 KH |
1055 | break; |
1056 | ||
1057 | case FW_NODE_DESTROYED: | |
1058 | case FW_NODE_LINK_OFF: | |
1059 | if (!node->data) | |
1060 | break; | |
1061 | ||
c781c06d KH |
1062 | /* |
1063 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1064 | * are two cases here: either the device is fully |
1065 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1066 | * process of reading its config rom | |
1067 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1068 | * initialized we can reuse device->work to schedule a | |
1069 | * full fw_device_shutdown(). If not, there's work | |
1070 | * scheduled to read it's config rom, and we just put | |
1071 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1072 | * to create the device. |
1073 | */ | |
19a15b93 | 1074 | device = node->data; |
641f8791 | 1075 | if (atomic_xchg(&device->state, |
3d36a0df | 1076 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1077 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1078 | schedule_delayed_work(&device->work, |
1079 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1080 | } |
1081 | break; | |
1082 | } | |
1083 | } |