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Commit | Line | Data |
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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> | |
cf417e54 | 32 | #include <linux/spinlock.h> |
b5d2a5e0 | 33 | #include <asm/system.h> |
7feb9cce | 34 | #include <linux/ctype.h> |
19a15b93 KH |
35 | #include "fw-transaction.h" |
36 | #include "fw-topology.h" | |
37 | #include "fw-device.h" | |
38 | ||
39 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
40 | { | |
41 | ci->p = p + 1; | |
42 | ci->end = ci->p + (p[0] >> 16); | |
43 | } | |
19a15b93 KH |
44 | EXPORT_SYMBOL(fw_csr_iterator_init); |
45 | ||
46 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
47 | { | |
48 | *key = *ci->p >> 24; | |
49 | *value = *ci->p & 0xffffff; | |
50 | ||
51 | return ci->p++ < ci->end; | |
52 | } | |
19a15b93 KH |
53 | EXPORT_SYMBOL(fw_csr_iterator_next); |
54 | ||
55 | static int is_fw_unit(struct device *dev); | |
56 | ||
21ebcd12 | 57 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
58 | { |
59 | struct fw_csr_iterator ci; | |
60 | int key, value, match; | |
61 | ||
62 | match = 0; | |
63 | fw_csr_iterator_init(&ci, directory); | |
64 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
65 | if (key == CSR_VENDOR && value == id->vendor) | |
66 | match |= FW_MATCH_VENDOR; | |
67 | if (key == CSR_MODEL && value == id->model) | |
68 | match |= FW_MATCH_MODEL; | |
69 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
70 | match |= FW_MATCH_SPECIFIER_ID; | |
71 | if (key == CSR_VERSION && value == id->version) | |
72 | match |= FW_MATCH_VERSION; | |
73 | } | |
74 | ||
75 | return (match & id->match_flags) == id->match_flags; | |
76 | } | |
77 | ||
78 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
79 | { | |
80 | struct fw_unit *unit = fw_unit(dev); | |
81 | struct fw_driver *driver = fw_driver(drv); | |
82 | int i; | |
83 | ||
84 | /* We only allow binding to fw_units. */ | |
85 | if (!is_fw_unit(dev)) | |
86 | return 0; | |
87 | ||
88 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
89 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
90 | return 1; | |
91 | } | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
97 | { | |
98 | struct fw_device *device = fw_device(unit->device.parent); | |
99 | struct fw_csr_iterator ci; | |
100 | ||
101 | int key, value; | |
102 | int vendor = 0; | |
103 | int model = 0; | |
104 | int specifier_id = 0; | |
105 | int version = 0; | |
106 | ||
107 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
108 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
109 | switch (key) { | |
110 | case CSR_VENDOR: | |
111 | vendor = value; | |
112 | break; | |
113 | case CSR_MODEL: | |
114 | model = value; | |
115 | break; | |
116 | } | |
117 | } | |
118 | ||
119 | fw_csr_iterator_init(&ci, unit->directory); | |
120 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
121 | switch (key) { | |
122 | case CSR_SPECIFIER_ID: | |
123 | specifier_id = value; | |
124 | break; | |
125 | case CSR_VERSION: | |
126 | version = value; | |
127 | break; | |
128 | } | |
129 | } | |
130 | ||
131 | return snprintf(buffer, buffer_size, | |
132 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
133 | vendor, model, specifier_id, version); | |
134 | } | |
135 | ||
136 | static int | |
7eff2e7a | 137 | fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
138 | { |
139 | struct fw_unit *unit = fw_unit(dev); | |
140 | char modalias[64]; | |
19a15b93 | 141 | |
2d826cc5 | 142 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 143 | |
7eff2e7a | 144 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
145 | return -ENOMEM; |
146 | ||
19a15b93 KH |
147 | return 0; |
148 | } | |
149 | ||
150 | struct bus_type fw_bus_type = { | |
362c2c8c | 151 | .name = "firewire", |
19a15b93 | 152 | .match = fw_unit_match, |
19a15b93 | 153 | }; |
19a15b93 KH |
154 | EXPORT_SYMBOL(fw_bus_type); |
155 | ||
19a15b93 KH |
156 | static void fw_device_release(struct device *dev) |
157 | { | |
158 | struct fw_device *device = fw_device(dev); | |
855c603d | 159 | struct fw_card *card = device->card; |
19a15b93 KH |
160 | unsigned long flags; |
161 | ||
c781c06d KH |
162 | /* |
163 | * Take the card lock so we don't set this to NULL while a | |
62305823 SR |
164 | * FW_NODE_UPDATED callback is being handled or while the |
165 | * bus manager work looks at this node. | |
c781c06d | 166 | */ |
c9755e14 | 167 | spin_lock_irqsave(&card->lock, flags); |
19a15b93 | 168 | device->node->data = NULL; |
c9755e14 | 169 | spin_unlock_irqrestore(&card->lock, flags); |
19a15b93 KH |
170 | |
171 | fw_node_put(device->node); | |
19a15b93 KH |
172 | kfree(device->config_rom); |
173 | kfree(device); | |
459f7923 | 174 | fw_card_put(card); |
19a15b93 KH |
175 | } |
176 | ||
177 | int fw_device_enable_phys_dma(struct fw_device *device) | |
178 | { | |
b5d2a5e0 SR |
179 | int generation = device->generation; |
180 | ||
181 | /* device->node_id, accessed below, must not be older than generation */ | |
182 | smp_rmb(); | |
183 | ||
19a15b93 KH |
184 | return device->card->driver->enable_phys_dma(device->card, |
185 | device->node_id, | |
b5d2a5e0 | 186 | generation); |
19a15b93 | 187 | } |
19a15b93 KH |
188 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
189 | ||
7feb9cce KH |
190 | struct config_rom_attribute { |
191 | struct device_attribute attr; | |
192 | u32 key; | |
193 | }; | |
194 | ||
195 | static ssize_t | |
196 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
197 | { | |
198 | struct config_rom_attribute *attr = | |
199 | container_of(dattr, struct config_rom_attribute, attr); | |
200 | struct fw_csr_iterator ci; | |
201 | u32 *dir; | |
c9755e14 SR |
202 | int key, value, ret = -ENOENT; |
203 | ||
204 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
205 | |
206 | if (is_fw_unit(dev)) | |
207 | dir = fw_unit(dev)->directory; | |
208 | else | |
209 | dir = fw_device(dev)->config_rom + 5; | |
210 | ||
211 | fw_csr_iterator_init(&ci, dir); | |
212 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
213 | if (attr->key == key) { |
214 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
215 | "0x%06x\n", value); | |
216 | break; | |
217 | } | |
218 | ||
219 | up_read(&fw_device_rwsem); | |
7feb9cce | 220 | |
c9755e14 | 221 | return ret; |
7feb9cce KH |
222 | } |
223 | ||
224 | #define IMMEDIATE_ATTR(name, key) \ | |
225 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
226 | ||
227 | static ssize_t | |
228 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
229 | { | |
230 | struct config_rom_attribute *attr = | |
231 | container_of(dattr, struct config_rom_attribute, attr); | |
232 | struct fw_csr_iterator ci; | |
233 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 234 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
235 | char *b; |
236 | ||
c9755e14 SR |
237 | down_read(&fw_device_rwsem); |
238 | ||
7feb9cce KH |
239 | if (is_fw_unit(dev)) |
240 | dir = fw_unit(dev)->directory; | |
241 | else | |
242 | dir = fw_device(dev)->config_rom + 5; | |
243 | ||
244 | fw_csr_iterator_init(&ci, dir); | |
245 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
246 | if (attr->key == last_key && | |
247 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
248 | block = ci.p - 1 + value; | |
249 | last_key = key; | |
250 | } | |
251 | ||
252 | if (block == NULL) | |
c9755e14 | 253 | goto out; |
7feb9cce KH |
254 | |
255 | length = min(block[0] >> 16, 256U); | |
256 | if (length < 3) | |
c9755e14 | 257 | goto out; |
7feb9cce KH |
258 | |
259 | if (block[1] != 0 || block[2] != 0) | |
260 | /* Unknown encoding. */ | |
c9755e14 | 261 | goto out; |
7feb9cce | 262 | |
c9755e14 SR |
263 | if (buf == NULL) { |
264 | ret = length * 4; | |
265 | goto out; | |
266 | } | |
7feb9cce KH |
267 | |
268 | b = buf; | |
269 | end = &block[length + 1]; | |
270 | for (p = &block[3]; p < end; p++, b += 4) | |
271 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
272 | ||
273 | /* Strip trailing whitespace and add newline. */ | |
274 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
275 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
276 | ret = b + 2 - buf; |
277 | out: | |
278 | up_read(&fw_device_rwsem); | |
7feb9cce | 279 | |
c9755e14 | 280 | return ret; |
7feb9cce KH |
281 | } |
282 | ||
283 | #define TEXT_LEAF_ATTR(name, key) \ | |
284 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
285 | ||
286 | static struct config_rom_attribute config_rom_attributes[] = { | |
287 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
288 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
289 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
290 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
291 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
292 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
293 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
294 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
295 | }; | |
296 | ||
297 | static void | |
6f2e53d5 KH |
298 | init_fw_attribute_group(struct device *dev, |
299 | struct device_attribute *attrs, | |
300 | struct fw_attribute_group *group) | |
7feb9cce KH |
301 | { |
302 | struct device_attribute *attr; | |
6f2e53d5 KH |
303 | int i, j; |
304 | ||
305 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
306 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
307 | |
308 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
309 | attr = &config_rom_attributes[i].attr; | |
310 | if (attr->show(dev, attr, NULL) < 0) | |
311 | continue; | |
6f2e53d5 | 312 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
313 | } |
314 | ||
6f2e53d5 KH |
315 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
316 | group->attrs[j++] = NULL; | |
317 | group->groups[0] = &group->group; | |
318 | group->groups[1] = NULL; | |
319 | group->group.attrs = group->attrs; | |
320 | dev->groups = group->groups; | |
7feb9cce KH |
321 | } |
322 | ||
19a15b93 | 323 | static ssize_t |
21351dbe KH |
324 | modalias_show(struct device *dev, |
325 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
326 | { |
327 | struct fw_unit *unit = fw_unit(dev); | |
328 | int length; | |
329 | ||
330 | length = get_modalias(unit, buf, PAGE_SIZE); | |
331 | strcpy(buf + length, "\n"); | |
332 | ||
333 | return length + 1; | |
334 | } | |
335 | ||
19a15b93 | 336 | static ssize_t |
21351dbe KH |
337 | rom_index_show(struct device *dev, |
338 | struct device_attribute *attr, char *buf) | |
19a15b93 | 339 | { |
21351dbe KH |
340 | struct fw_device *device = fw_device(dev->parent); |
341 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 342 | |
21351dbe KH |
343 | return snprintf(buf, PAGE_SIZE, "%d\n", |
344 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
345 | } |
346 | ||
21351dbe KH |
347 | static struct device_attribute fw_unit_attributes[] = { |
348 | __ATTR_RO(modalias), | |
349 | __ATTR_RO(rom_index), | |
350 | __ATTR_NULL, | |
19a15b93 KH |
351 | }; |
352 | ||
048961ef | 353 | static ssize_t |
bbd14945 | 354 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 355 | { |
21351dbe | 356 | struct fw_device *device = fw_device(dev); |
c9755e14 | 357 | size_t length; |
048961ef | 358 | |
c9755e14 SR |
359 | down_read(&fw_device_rwsem); |
360 | length = device->config_rom_length * 4; | |
361 | memcpy(buf, device->config_rom, length); | |
362 | up_read(&fw_device_rwsem); | |
21351dbe | 363 | |
c9755e14 | 364 | return length; |
048961ef KH |
365 | } |
366 | ||
bbd14945 KH |
367 | static ssize_t |
368 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
369 | { | |
370 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
371 | int ret; |
372 | ||
373 | down_read(&fw_device_rwsem); | |
374 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
375 | device->config_rom[3], device->config_rom[4]); | |
376 | up_read(&fw_device_rwsem); | |
bbd14945 | 377 | |
c9755e14 | 378 | return ret; |
bbd14945 KH |
379 | } |
380 | ||
21351dbe KH |
381 | static struct device_attribute fw_device_attributes[] = { |
382 | __ATTR_RO(config_rom), | |
bbd14945 | 383 | __ATTR_RO(guid), |
21351dbe | 384 | __ATTR_NULL, |
048961ef KH |
385 | }; |
386 | ||
f8d2dc39 SR |
387 | static int |
388 | read_rom(struct fw_device *device, int generation, int index, u32 *data) | |
19a15b93 | 389 | { |
1e119fa9 | 390 | int rcode; |
b5d2a5e0 SR |
391 | |
392 | /* device->node_id, accessed below, must not be older than generation */ | |
393 | smp_rmb(); | |
19a15b93 | 394 | |
1e119fa9 | 395 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 396 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
397 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
398 | data, 4); | |
399 | be32_to_cpus(data); | |
19a15b93 | 400 | |
1e119fa9 | 401 | return rcode; |
19a15b93 KH |
402 | } |
403 | ||
1dadff71 SR |
404 | #define READ_BIB_ROM_SIZE 256 |
405 | #define READ_BIB_STACK_SIZE 16 | |
406 | ||
f8d2dc39 SR |
407 | /* |
408 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
409 | * the config ROM. We do all this with a cached bus generation. If the bus | |
410 | * generation changes under us, read_bus_info_block will fail and get retried. | |
411 | * It's better to start all over in this case because the node from which we | |
412 | * are reading the ROM may have changed the ROM during the reset. | |
413 | */ | |
414 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 415 | { |
c9755e14 | 416 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
417 | u32 sp, key; |
418 | int i, end, length, ret = -1; | |
419 | ||
420 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
421 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
422 | if (rom == NULL) | |
423 | return -ENOMEM; | |
424 | ||
425 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 426 | |
f1397490 SR |
427 | device->max_speed = SCODE_100; |
428 | ||
19a15b93 KH |
429 | /* First read the bus info block. */ |
430 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 431 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 432 | goto out; |
c781c06d KH |
433 | /* |
434 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
435 | * reply with a 0 for the first quadlet of the config |
436 | * rom to indicate that they are booting (for example, | |
437 | * if the firmware is on the disk of a external | |
438 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
439 | * retry mechanism will try again later. |
440 | */ | |
19a15b93 | 441 | if (i == 0 && rom[i] == 0) |
1dadff71 | 442 | goto out; |
19a15b93 KH |
443 | } |
444 | ||
f1397490 SR |
445 | device->max_speed = device->node->max_speed; |
446 | ||
447 | /* | |
448 | * Determine the speed of | |
449 | * - devices with link speed less than PHY speed, | |
450 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
451 | * - all devices if there are 1394b repeaters. | |
452 | * Note, we cannot use the bus info block's link_spd as starting point | |
453 | * because some buggy firmwares set it lower than necessary and because | |
454 | * 1394-1995 nodes do not have the field. | |
455 | */ | |
456 | if ((rom[2] & 0x7) < device->max_speed || | |
457 | device->max_speed == SCODE_BETA || | |
458 | device->card->beta_repeaters_present) { | |
459 | u32 dummy; | |
460 | ||
461 | /* for S1600 and S3200 */ | |
462 | if (device->max_speed == SCODE_BETA) | |
463 | device->max_speed = device->card->link_speed; | |
464 | ||
465 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
466 | if (read_rom(device, generation, 0, &dummy) == |
467 | RCODE_COMPLETE) | |
f1397490 SR |
468 | break; |
469 | device->max_speed--; | |
470 | } | |
471 | } | |
472 | ||
c781c06d KH |
473 | /* |
474 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
475 | * directory structure so we parse it using a stack of |
476 | * references to the blocks that make up the structure. We | |
477 | * push a reference to the root directory on the stack to | |
c781c06d KH |
478 | * start things off. |
479 | */ | |
19a15b93 KH |
480 | length = i; |
481 | sp = 0; | |
482 | stack[sp++] = 0xc0000005; | |
483 | while (sp > 0) { | |
c781c06d KH |
484 | /* |
485 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
486 | * lower 24 bits is the offset into the config rom, |
487 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
488 | * block. |
489 | */ | |
19a15b93 KH |
490 | key = stack[--sp]; |
491 | i = key & 0xffffff; | |
1dadff71 | 492 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
493 | /* |
494 | * The reference points outside the standard | |
495 | * config rom area, something's fishy. | |
496 | */ | |
1dadff71 | 497 | goto out; |
19a15b93 KH |
498 | |
499 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 500 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 501 | goto out; |
19a15b93 KH |
502 | end = i + (rom[i] >> 16) + 1; |
503 | i++; | |
1dadff71 | 504 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
505 | /* |
506 | * This block extends outside standard config | |
19a15b93 KH |
507 | * area (and the array we're reading it |
508 | * into). That's broken, so ignore this | |
c781c06d KH |
509 | * device. |
510 | */ | |
1dadff71 | 511 | goto out; |
19a15b93 | 512 | |
c781c06d KH |
513 | /* |
514 | * Now read in the block. If this is a directory | |
19a15b93 | 515 | * block, check the entries as we read them to see if |
c781c06d KH |
516 | * it references another block, and push it in that case. |
517 | */ | |
19a15b93 | 518 | while (i < end) { |
f8d2dc39 SR |
519 | if (read_rom(device, generation, i, &rom[i]) != |
520 | RCODE_COMPLETE) | |
1dadff71 | 521 | goto out; |
19a15b93 | 522 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 523 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
524 | stack[sp++] = i + rom[i]; |
525 | i++; | |
526 | } | |
527 | if (length < i) | |
528 | length = i; | |
529 | } | |
530 | ||
c9755e14 SR |
531 | old_rom = device->config_rom; |
532 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
533 | if (new_rom == NULL) | |
1dadff71 | 534 | goto out; |
c9755e14 SR |
535 | |
536 | down_write(&fw_device_rwsem); | |
537 | device->config_rom = new_rom; | |
19a15b93 | 538 | device->config_rom_length = length; |
c9755e14 SR |
539 | up_write(&fw_device_rwsem); |
540 | ||
541 | kfree(old_rom); | |
1dadff71 | 542 | ret = 0; |
c9755e14 | 543 | device->cmc = rom[2] & 1 << 30; |
1dadff71 SR |
544 | out: |
545 | kfree(rom); | |
19a15b93 | 546 | |
1dadff71 | 547 | return ret; |
19a15b93 KH |
548 | } |
549 | ||
550 | static void fw_unit_release(struct device *dev) | |
551 | { | |
552 | struct fw_unit *unit = fw_unit(dev); | |
553 | ||
554 | kfree(unit); | |
555 | } | |
556 | ||
21351dbe | 557 | static struct device_type fw_unit_type = { |
21351dbe KH |
558 | .uevent = fw_unit_uevent, |
559 | .release = fw_unit_release, | |
560 | }; | |
561 | ||
19a15b93 KH |
562 | static int is_fw_unit(struct device *dev) |
563 | { | |
21351dbe | 564 | return dev->type == &fw_unit_type; |
19a15b93 KH |
565 | } |
566 | ||
567 | static void create_units(struct fw_device *device) | |
568 | { | |
569 | struct fw_csr_iterator ci; | |
570 | struct fw_unit *unit; | |
571 | int key, value, i; | |
572 | ||
573 | i = 0; | |
574 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
575 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
576 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
577 | continue; | |
578 | ||
c781c06d KH |
579 | /* |
580 | * Get the address of the unit directory and try to | |
581 | * match the drivers id_tables against it. | |
582 | */ | |
2d826cc5 | 583 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
584 | if (unit == NULL) { |
585 | fw_error("failed to allocate memory for unit\n"); | |
586 | continue; | |
587 | } | |
588 | ||
589 | unit->directory = ci.p + value - 1; | |
590 | unit->device.bus = &fw_bus_type; | |
21351dbe | 591 | unit->device.type = &fw_unit_type; |
19a15b93 | 592 | unit->device.parent = &device->device; |
a1f64819 | 593 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 594 | |
6f2e53d5 KH |
595 | init_fw_attribute_group(&unit->device, |
596 | fw_unit_attributes, | |
597 | &unit->attribute_group); | |
7feb9cce KH |
598 | if (device_register(&unit->device) < 0) |
599 | goto skip_unit; | |
600 | ||
7feb9cce KH |
601 | continue; |
602 | ||
7feb9cce KH |
603 | skip_unit: |
604 | kfree(unit); | |
19a15b93 KH |
605 | } |
606 | } | |
607 | ||
608 | static int shutdown_unit(struct device *device, void *data) | |
609 | { | |
21351dbe | 610 | device_unregister(device); |
19a15b93 KH |
611 | |
612 | return 0; | |
613 | } | |
614 | ||
c9755e14 SR |
615 | /* |
616 | * fw_device_rwsem acts as dual purpose mutex: | |
617 | * - serializes accesses to fw_device_idr, | |
618 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
619 | * fw_unit.directory, unless those accesses happen at safe occasions | |
620 | */ | |
621 | DECLARE_RWSEM(fw_device_rwsem); | |
622 | ||
d6053e08 | 623 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
624 | int fw_cdev_major; |
625 | ||
96b19062 | 626 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
627 | { |
628 | struct fw_device *device; | |
629 | ||
c9755e14 | 630 | down_read(&fw_device_rwsem); |
a3aca3da | 631 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
632 | if (device) |
633 | fw_device_get(device); | |
c9755e14 | 634 | up_read(&fw_device_rwsem); |
a3aca3da KH |
635 | |
636 | return device; | |
637 | } | |
638 | ||
3d36a0df SR |
639 | /* |
640 | * These defines control the retry behavior for reading the config | |
641 | * rom. It shouldn't be necessary to tweak these; if the device | |
642 | * doesn't respond to a config rom read within 10 seconds, it's not | |
643 | * going to respond at all. As for the initial delay, a lot of | |
644 | * devices will be able to respond within half a second after bus | |
645 | * reset. On the other hand, it's not really worth being more | |
646 | * aggressive than that, since it scales pretty well; if 10 devices | |
647 | * are plugged in, they're all getting read within one second. | |
648 | */ | |
649 | ||
650 | #define MAX_RETRIES 10 | |
651 | #define RETRY_DELAY (3 * HZ) | |
652 | #define INITIAL_DELAY (HZ / 2) | |
653 | #define SHUTDOWN_DELAY (2 * HZ) | |
654 | ||
19a15b93 KH |
655 | static void fw_device_shutdown(struct work_struct *work) |
656 | { | |
657 | struct fw_device *device = | |
658 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
659 | int minor = MINOR(device->device.devt); |
660 | ||
e747a5c0 SR |
661 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
662 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
663 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
664 | return; | |
665 | } | |
666 | ||
667 | if (atomic_cmpxchg(&device->state, | |
668 | FW_DEVICE_GONE, | |
669 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
670 | return; | |
671 | ||
2603bf21 | 672 | fw_device_cdev_remove(device); |
19a15b93 KH |
673 | device_for_each_child(&device->device, NULL, shutdown_unit); |
674 | device_unregister(&device->device); | |
96b19062 | 675 | |
c9755e14 | 676 | down_write(&fw_device_rwsem); |
96b19062 | 677 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 678 | up_write(&fw_device_rwsem); |
3d36a0df | 679 | |
96b19062 | 680 | fw_device_put(device); |
19a15b93 KH |
681 | } |
682 | ||
21351dbe | 683 | static struct device_type fw_device_type = { |
21351dbe KH |
684 | .release = fw_device_release, |
685 | }; | |
686 | ||
3d36a0df SR |
687 | static void fw_device_update(struct work_struct *work); |
688 | ||
c781c06d | 689 | /* |
3d36a0df SR |
690 | * If a device was pending for deletion because its node went away but its |
691 | * bus info block and root directory header matches that of a newly discovered | |
692 | * device, revive the existing fw_device. | |
693 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 694 | */ |
3d36a0df SR |
695 | static int lookup_existing_device(struct device *dev, void *data) |
696 | { | |
697 | struct fw_device *old = fw_device(dev); | |
698 | struct fw_device *new = data; | |
699 | struct fw_card *card = new->card; | |
700 | int match = 0; | |
701 | ||
702 | down_read(&fw_device_rwsem); /* serialize config_rom access */ | |
703 | spin_lock_irq(&card->lock); /* serialize node access */ | |
704 | ||
705 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
706 | atomic_cmpxchg(&old->state, | |
707 | FW_DEVICE_GONE, | |
708 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
709 | struct fw_node *current_node = new->node; | |
710 | struct fw_node *obsolete_node = old->node; | |
711 | ||
712 | new->node = obsolete_node; | |
713 | new->node->data = new; | |
714 | old->node = current_node; | |
715 | old->node->data = old; | |
716 | ||
717 | old->max_speed = new->max_speed; | |
718 | old->node_id = current_node->node_id; | |
719 | smp_wmb(); /* update node_id before generation */ | |
720 | old->generation = card->generation; | |
721 | old->config_rom_retries = 0; | |
722 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 723 | |
3d36a0df SR |
724 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
725 | schedule_delayed_work(&old->work, 0); | |
726 | ||
727 | if (current_node == card->root_node) | |
728 | fw_schedule_bm_work(card, 0); | |
729 | ||
730 | match = 1; | |
731 | } | |
732 | ||
733 | spin_unlock_irq(&card->lock); | |
734 | up_read(&fw_device_rwsem); | |
735 | ||
736 | return match; | |
737 | } | |
19a15b93 KH |
738 | |
739 | static void fw_device_init(struct work_struct *work) | |
740 | { | |
19a15b93 KH |
741 | struct fw_device *device = |
742 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 743 | struct device *revived_dev; |
a3aca3da | 744 | int minor, err; |
19a15b93 | 745 | |
c781c06d KH |
746 | /* |
747 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 748 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
749 | * device. |
750 | */ | |
19a15b93 | 751 | |
f8d2dc39 | 752 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
753 | if (device->config_rom_retries < MAX_RETRIES && |
754 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
755 | device->config_rom_retries++; |
756 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
757 | } else { | |
907293d7 | 758 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 759 | device->node_id); |
931c4834 | 760 | if (device->node == device->card->root_node) |
0fa1986f | 761 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
762 | fw_device_release(&device->device); |
763 | } | |
764 | return; | |
765 | } | |
766 | ||
3d36a0df SR |
767 | revived_dev = device_find_child(device->card->device, |
768 | device, lookup_existing_device); | |
769 | if (revived_dev) { | |
770 | put_device(revived_dev); | |
771 | fw_device_release(&device->device); | |
772 | ||
773 | return; | |
774 | } | |
775 | ||
62305823 | 776 | device_initialize(&device->device); |
96b19062 SR |
777 | |
778 | fw_device_get(device); | |
c9755e14 | 779 | down_write(&fw_device_rwsem); |
62305823 SR |
780 | err = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
781 | idr_get_new(&fw_device_idr, device, &minor) : | |
782 | -ENOMEM; | |
c9755e14 | 783 | up_write(&fw_device_rwsem); |
96b19062 | 784 | |
a3aca3da KH |
785 | if (err < 0) |
786 | goto error; | |
787 | ||
19a15b93 | 788 | device->device.bus = &fw_bus_type; |
21351dbe | 789 | device->device.type = &fw_device_type; |
19a15b93 | 790 | device->device.parent = device->card->device; |
a3aca3da | 791 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 792 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 793 | |
6f2e53d5 KH |
794 | init_fw_attribute_group(&device->device, |
795 | fw_device_attributes, | |
796 | &device->attribute_group); | |
19a15b93 KH |
797 | if (device_add(&device->device)) { |
798 | fw_error("Failed to add device.\n"); | |
a3aca3da | 799 | goto error_with_cdev; |
19a15b93 KH |
800 | } |
801 | ||
19a15b93 KH |
802 | create_units(device); |
803 | ||
c781c06d KH |
804 | /* |
805 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
806 | * out from under us while we did the intialization work, we |
807 | * have to shut down the device again here. Normally, though, | |
808 | * fw_node_event will be responsible for shutting it down when | |
809 | * necessary. We have to use the atomic cmpxchg here to avoid | |
810 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
811 | * fw_node_event(). |
812 | */ | |
641f8791 | 813 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
814 | FW_DEVICE_INITIALIZING, |
815 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
816 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
817 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
818 | } else { |
819 | if (device->config_rom_retries) | |
820 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
821 | "%d config ROM retries\n", | |
a1f64819 | 822 | dev_name(&device->device), |
fa6e697b SR |
823 | device->config_rom[3], device->config_rom[4], |
824 | 1 << device->max_speed, | |
825 | device->config_rom_retries); | |
826 | else | |
827 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 828 | dev_name(&device->device), |
fa6e697b SR |
829 | device->config_rom[3], device->config_rom[4], |
830 | 1 << device->max_speed); | |
c9755e14 | 831 | device->config_rom_retries = 0; |
fa6e697b | 832 | } |
19a15b93 | 833 | |
c781c06d KH |
834 | /* |
835 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
836 | * root node config rom. If this races with a bus reset we |
837 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
838 | * pretty harmless. |
839 | */ | |
19a15b93 | 840 | if (device->node == device->card->root_node) |
0fa1986f | 841 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
842 | |
843 | return; | |
844 | ||
a3aca3da | 845 | error_with_cdev: |
c9755e14 | 846 | down_write(&fw_device_rwsem); |
a3aca3da | 847 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 848 | up_write(&fw_device_rwsem); |
373b2edd | 849 | error: |
96b19062 SR |
850 | fw_device_put(device); /* fw_device_idr's reference */ |
851 | ||
852 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
853 | } |
854 | ||
855 | static int update_unit(struct device *dev, void *data) | |
856 | { | |
857 | struct fw_unit *unit = fw_unit(dev); | |
858 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
859 | ||
015b066f KH |
860 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
861 | down(&dev->sem); | |
19a15b93 | 862 | driver->update(unit); |
015b066f KH |
863 | up(&dev->sem); |
864 | } | |
19a15b93 KH |
865 | |
866 | return 0; | |
867 | } | |
868 | ||
5f480477 KH |
869 | static void fw_device_update(struct work_struct *work) |
870 | { | |
871 | struct fw_device *device = | |
872 | container_of(work, struct fw_device, work.work); | |
873 | ||
97bd9efa | 874 | fw_device_cdev_update(device); |
5f480477 KH |
875 | device_for_each_child(&device->device, NULL, update_unit); |
876 | } | |
877 | ||
c9755e14 SR |
878 | enum { |
879 | REREAD_BIB_ERROR, | |
880 | REREAD_BIB_GONE, | |
881 | REREAD_BIB_UNCHANGED, | |
882 | REREAD_BIB_CHANGED, | |
883 | }; | |
884 | ||
885 | /* Reread and compare bus info block and header of root directory */ | |
886 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
887 | { | |
888 | u32 q; | |
889 | int i; | |
890 | ||
891 | for (i = 0; i < 6; i++) { | |
892 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
893 | return REREAD_BIB_ERROR; | |
894 | ||
895 | if (i == 0 && q == 0) | |
896 | return REREAD_BIB_GONE; | |
897 | ||
898 | if (i > device->config_rom_length || q != device->config_rom[i]) | |
899 | return REREAD_BIB_CHANGED; | |
900 | } | |
901 | ||
902 | return REREAD_BIB_UNCHANGED; | |
903 | } | |
904 | ||
905 | static void fw_device_refresh(struct work_struct *work) | |
906 | { | |
907 | struct fw_device *device = | |
908 | container_of(work, struct fw_device, work.work); | |
909 | struct fw_card *card = device->card; | |
910 | int node_id = device->node_id; | |
911 | ||
912 | switch (reread_bus_info_block(device, device->generation)) { | |
913 | case REREAD_BIB_ERROR: | |
914 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
915 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
916 | device->config_rom_retries++; | |
917 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
918 | ||
919 | return; | |
920 | } | |
921 | goto give_up; | |
922 | ||
923 | case REREAD_BIB_GONE: | |
924 | goto gone; | |
925 | ||
926 | case REREAD_BIB_UNCHANGED: | |
927 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
928 | FW_DEVICE_INITIALIZING, |
929 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
930 | goto gone; |
931 | ||
932 | fw_device_update(work); | |
933 | device->config_rom_retries = 0; | |
934 | goto out; | |
935 | ||
936 | case REREAD_BIB_CHANGED: | |
937 | break; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Something changed. We keep things simple and don't investigate | |
942 | * further. We just destroy all previous units and create new ones. | |
943 | */ | |
944 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
945 | ||
946 | if (read_bus_info_block(device, device->generation) < 0) { | |
947 | if (device->config_rom_retries < MAX_RETRIES && | |
948 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
949 | device->config_rom_retries++; | |
950 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
951 | ||
952 | return; | |
953 | } | |
954 | goto give_up; | |
955 | } | |
956 | ||
957 | create_units(device); | |
958 | ||
959 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
960 | FW_DEVICE_INITIALIZING, |
961 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
962 | goto gone; |
963 | ||
a1f64819 | 964 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
965 | device->config_rom_retries = 0; |
966 | goto out; | |
967 | ||
968 | give_up: | |
a1f64819 | 969 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 970 | gone: |
3d36a0df SR |
971 | atomic_set(&device->state, FW_DEVICE_GONE); |
972 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
973 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
974 | out: |
975 | if (node_id == card->root_node->node_id) | |
0fa1986f | 976 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
977 | } |
978 | ||
19a15b93 KH |
979 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
980 | { | |
981 | struct fw_device *device; | |
982 | ||
19a15b93 KH |
983 | switch (event) { |
984 | case FW_NODE_CREATED: | |
985 | case FW_NODE_LINK_ON: | |
986 | if (!node->link_on) | |
987 | break; | |
c9755e14 | 988 | create: |
19a15b93 KH |
989 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
990 | if (device == NULL) | |
991 | break; | |
992 | ||
c781c06d KH |
993 | /* |
994 | * Do minimal intialization of the device here, the | |
62305823 SR |
995 | * rest will happen in fw_device_init(). |
996 | * | |
997 | * Attention: A lot of things, even fw_device_get(), | |
998 | * cannot be done before fw_device_init() finished! | |
999 | * You can basically just check device->state and | |
1000 | * schedule work until then, but only while holding | |
1001 | * card->lock. | |
c781c06d | 1002 | */ |
641f8791 | 1003 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1004 | device->card = fw_card_get(card); |
19a15b93 KH |
1005 | device->node = fw_node_get(node); |
1006 | device->node_id = node->node_id; | |
1007 | device->generation = card->generation; | |
cf417e54 | 1008 | spin_lock_init(&device->client_list_lock); |
97bd9efa | 1009 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1010 | |
c781c06d KH |
1011 | /* |
1012 | * Set the node data to point back to this device so | |
19a15b93 | 1013 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1014 | * and generation for the device. |
1015 | */ | |
19a15b93 KH |
1016 | node->data = device; |
1017 | ||
c781c06d KH |
1018 | /* |
1019 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1020 | * especially if they are bus powered and go through |
1021 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1022 | * first config rom scan half a second after bus reset. |
1023 | */ | |
19a15b93 KH |
1024 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1025 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1026 | break; | |
1027 | ||
c9755e14 SR |
1028 | case FW_NODE_INITIATED_RESET: |
1029 | device = node->data; | |
1030 | if (device == NULL) | |
1031 | goto create; | |
1032 | ||
1033 | device->node_id = node->node_id; | |
1034 | smp_wmb(); /* update node_id before generation */ | |
1035 | device->generation = card->generation; | |
1036 | if (atomic_cmpxchg(&device->state, | |
1037 | FW_DEVICE_RUNNING, | |
1038 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1039 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1040 | schedule_delayed_work(&device->work, | |
1041 | node == card->local_node ? 0 : INITIAL_DELAY); | |
1042 | } | |
1043 | break; | |
1044 | ||
19a15b93 KH |
1045 | case FW_NODE_UPDATED: |
1046 | if (!node->link_on || node->data == NULL) | |
1047 | break; | |
1048 | ||
1049 | device = node->data; | |
1050 | device->node_id = node->node_id; | |
b5d2a5e0 | 1051 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1052 | device->generation = card->generation; |
5f480477 KH |
1053 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1054 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1055 | schedule_delayed_work(&device->work, 0); | |
1056 | } | |
19a15b93 KH |
1057 | break; |
1058 | ||
1059 | case FW_NODE_DESTROYED: | |
1060 | case FW_NODE_LINK_OFF: | |
1061 | if (!node->data) | |
1062 | break; | |
1063 | ||
c781c06d KH |
1064 | /* |
1065 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1066 | * are two cases here: either the device is fully |
1067 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1068 | * process of reading its config rom | |
1069 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1070 | * initialized we can reuse device->work to schedule a | |
1071 | * full fw_device_shutdown(). If not, there's work | |
1072 | * scheduled to read it's config rom, and we just put | |
1073 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1074 | * to create the device. |
1075 | */ | |
19a15b93 | 1076 | device = node->data; |
641f8791 | 1077 | if (atomic_xchg(&device->state, |
3d36a0df | 1078 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1079 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1080 | schedule_delayed_work(&device->work, |
1081 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1082 | } |
1083 | break; | |
1084 | } | |
1085 | } |