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> |
d67cfb96 | 30 | #include <linux/mutex.h> |
6188e10d MW |
31 | #include <linux/rwsem.h> |
32 | #include <linux/semaphore.h> | |
cf417e54 | 33 | #include <linux/spinlock.h> |
b5d2a5e0 | 34 | #include <asm/system.h> |
7feb9cce | 35 | #include <linux/ctype.h> |
19a15b93 KH |
36 | #include "fw-transaction.h" |
37 | #include "fw-topology.h" | |
38 | #include "fw-device.h" | |
39 | ||
40 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
41 | { | |
42 | ci->p = p + 1; | |
43 | ci->end = ci->p + (p[0] >> 16); | |
44 | } | |
19a15b93 KH |
45 | EXPORT_SYMBOL(fw_csr_iterator_init); |
46 | ||
47 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
48 | { | |
49 | *key = *ci->p >> 24; | |
50 | *value = *ci->p & 0xffffff; | |
51 | ||
52 | return ci->p++ < ci->end; | |
53 | } | |
19a15b93 KH |
54 | EXPORT_SYMBOL(fw_csr_iterator_next); |
55 | ||
56 | static int is_fw_unit(struct device *dev); | |
57 | ||
21ebcd12 | 58 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
59 | { |
60 | struct fw_csr_iterator ci; | |
61 | int key, value, match; | |
62 | ||
63 | match = 0; | |
64 | fw_csr_iterator_init(&ci, directory); | |
65 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
66 | if (key == CSR_VENDOR && value == id->vendor) | |
67 | match |= FW_MATCH_VENDOR; | |
68 | if (key == CSR_MODEL && value == id->model) | |
69 | match |= FW_MATCH_MODEL; | |
70 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
71 | match |= FW_MATCH_SPECIFIER_ID; | |
72 | if (key == CSR_VERSION && value == id->version) | |
73 | match |= FW_MATCH_VERSION; | |
74 | } | |
75 | ||
76 | return (match & id->match_flags) == id->match_flags; | |
77 | } | |
78 | ||
79 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
80 | { | |
81 | struct fw_unit *unit = fw_unit(dev); | |
82 | struct fw_driver *driver = fw_driver(drv); | |
83 | int i; | |
84 | ||
85 | /* We only allow binding to fw_units. */ | |
86 | if (!is_fw_unit(dev)) | |
87 | return 0; | |
88 | ||
89 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
90 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
91 | return 1; | |
92 | } | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
98 | { | |
99 | struct fw_device *device = fw_device(unit->device.parent); | |
100 | struct fw_csr_iterator ci; | |
101 | ||
102 | int key, value; | |
103 | int vendor = 0; | |
104 | int model = 0; | |
105 | int specifier_id = 0; | |
106 | int version = 0; | |
107 | ||
108 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
109 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
110 | switch (key) { | |
111 | case CSR_VENDOR: | |
112 | vendor = value; | |
113 | break; | |
114 | case CSR_MODEL: | |
115 | model = value; | |
116 | break; | |
117 | } | |
118 | } | |
119 | ||
120 | fw_csr_iterator_init(&ci, unit->directory); | |
121 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
122 | switch (key) { | |
123 | case CSR_SPECIFIER_ID: | |
124 | specifier_id = value; | |
125 | break; | |
126 | case CSR_VERSION: | |
127 | version = value; | |
128 | break; | |
129 | } | |
130 | } | |
131 | ||
132 | return snprintf(buffer, buffer_size, | |
133 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
134 | vendor, model, specifier_id, version); | |
135 | } | |
136 | ||
137 | static int | |
7eff2e7a | 138 | fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
139 | { |
140 | struct fw_unit *unit = fw_unit(dev); | |
141 | char modalias[64]; | |
19a15b93 | 142 | |
2d826cc5 | 143 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 144 | |
7eff2e7a | 145 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
146 | return -ENOMEM; |
147 | ||
19a15b93 KH |
148 | return 0; |
149 | } | |
150 | ||
151 | struct bus_type fw_bus_type = { | |
362c2c8c | 152 | .name = "firewire", |
19a15b93 | 153 | .match = fw_unit_match, |
19a15b93 | 154 | }; |
19a15b93 KH |
155 | EXPORT_SYMBOL(fw_bus_type); |
156 | ||
19a15b93 KH |
157 | static void fw_device_release(struct device *dev) |
158 | { | |
159 | struct fw_device *device = fw_device(dev); | |
855c603d | 160 | struct fw_card *card = device->card; |
19a15b93 KH |
161 | unsigned long flags; |
162 | ||
c781c06d KH |
163 | /* |
164 | * Take the card lock so we don't set this to NULL while a | |
62305823 SR |
165 | * FW_NODE_UPDATED callback is being handled or while the |
166 | * bus manager work looks at this node. | |
c781c06d | 167 | */ |
c9755e14 | 168 | spin_lock_irqsave(&card->lock, flags); |
19a15b93 | 169 | device->node->data = NULL; |
c9755e14 | 170 | spin_unlock_irqrestore(&card->lock, flags); |
19a15b93 KH |
171 | |
172 | fw_node_put(device->node); | |
19a15b93 KH |
173 | kfree(device->config_rom); |
174 | kfree(device); | |
459f7923 | 175 | fw_card_put(card); |
19a15b93 KH |
176 | } |
177 | ||
178 | int fw_device_enable_phys_dma(struct fw_device *device) | |
179 | { | |
b5d2a5e0 SR |
180 | int generation = device->generation; |
181 | ||
182 | /* device->node_id, accessed below, must not be older than generation */ | |
183 | smp_rmb(); | |
184 | ||
19a15b93 KH |
185 | return device->card->driver->enable_phys_dma(device->card, |
186 | device->node_id, | |
b5d2a5e0 | 187 | generation); |
19a15b93 | 188 | } |
19a15b93 KH |
189 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
190 | ||
7feb9cce KH |
191 | struct config_rom_attribute { |
192 | struct device_attribute attr; | |
193 | u32 key; | |
194 | }; | |
195 | ||
196 | static ssize_t | |
197 | show_immediate(struct device *dev, struct device_attribute *dattr, char *buf) | |
198 | { | |
199 | struct config_rom_attribute *attr = | |
200 | container_of(dattr, struct config_rom_attribute, attr); | |
201 | struct fw_csr_iterator ci; | |
202 | u32 *dir; | |
c9755e14 SR |
203 | int key, value, ret = -ENOENT; |
204 | ||
205 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
206 | |
207 | if (is_fw_unit(dev)) | |
208 | dir = fw_unit(dev)->directory; | |
209 | else | |
210 | dir = fw_device(dev)->config_rom + 5; | |
211 | ||
212 | fw_csr_iterator_init(&ci, dir); | |
213 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
214 | if (attr->key == key) { |
215 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
216 | "0x%06x\n", value); | |
217 | break; | |
218 | } | |
219 | ||
220 | up_read(&fw_device_rwsem); | |
7feb9cce | 221 | |
c9755e14 | 222 | return ret; |
7feb9cce KH |
223 | } |
224 | ||
225 | #define IMMEDIATE_ATTR(name, key) \ | |
226 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
227 | ||
228 | static ssize_t | |
229 | show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf) | |
230 | { | |
231 | struct config_rom_attribute *attr = | |
232 | container_of(dattr, struct config_rom_attribute, attr); | |
233 | struct fw_csr_iterator ci; | |
234 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 235 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
236 | char *b; |
237 | ||
c9755e14 SR |
238 | down_read(&fw_device_rwsem); |
239 | ||
7feb9cce KH |
240 | if (is_fw_unit(dev)) |
241 | dir = fw_unit(dev)->directory; | |
242 | else | |
243 | dir = fw_device(dev)->config_rom + 5; | |
244 | ||
245 | fw_csr_iterator_init(&ci, dir); | |
246 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
247 | if (attr->key == last_key && | |
248 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
249 | block = ci.p - 1 + value; | |
250 | last_key = key; | |
251 | } | |
252 | ||
253 | if (block == NULL) | |
c9755e14 | 254 | goto out; |
7feb9cce KH |
255 | |
256 | length = min(block[0] >> 16, 256U); | |
257 | if (length < 3) | |
c9755e14 | 258 | goto out; |
7feb9cce KH |
259 | |
260 | if (block[1] != 0 || block[2] != 0) | |
261 | /* Unknown encoding. */ | |
c9755e14 | 262 | goto out; |
7feb9cce | 263 | |
c9755e14 SR |
264 | if (buf == NULL) { |
265 | ret = length * 4; | |
266 | goto out; | |
267 | } | |
7feb9cce KH |
268 | |
269 | b = buf; | |
270 | end = &block[length + 1]; | |
271 | for (p = &block[3]; p < end; p++, b += 4) | |
272 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
273 | ||
274 | /* Strip trailing whitespace and add newline. */ | |
275 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
276 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
277 | ret = b + 2 - buf; |
278 | out: | |
279 | up_read(&fw_device_rwsem); | |
7feb9cce | 280 | |
c9755e14 | 281 | return ret; |
7feb9cce KH |
282 | } |
283 | ||
284 | #define TEXT_LEAF_ATTR(name, key) \ | |
285 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
286 | ||
287 | static struct config_rom_attribute config_rom_attributes[] = { | |
288 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
289 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
290 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
291 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
292 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
293 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
294 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
295 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
296 | }; | |
297 | ||
298 | static void | |
6f2e53d5 KH |
299 | init_fw_attribute_group(struct device *dev, |
300 | struct device_attribute *attrs, | |
301 | struct fw_attribute_group *group) | |
7feb9cce KH |
302 | { |
303 | struct device_attribute *attr; | |
6f2e53d5 KH |
304 | int i, j; |
305 | ||
306 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
307 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
308 | |
309 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
310 | attr = &config_rom_attributes[i].attr; | |
311 | if (attr->show(dev, attr, NULL) < 0) | |
312 | continue; | |
6f2e53d5 | 313 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
314 | } |
315 | ||
6f2e53d5 KH |
316 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
317 | group->attrs[j++] = NULL; | |
318 | group->groups[0] = &group->group; | |
319 | group->groups[1] = NULL; | |
320 | group->group.attrs = group->attrs; | |
321 | dev->groups = group->groups; | |
7feb9cce KH |
322 | } |
323 | ||
19a15b93 | 324 | static ssize_t |
21351dbe KH |
325 | modalias_show(struct device *dev, |
326 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
327 | { |
328 | struct fw_unit *unit = fw_unit(dev); | |
329 | int length; | |
330 | ||
331 | length = get_modalias(unit, buf, PAGE_SIZE); | |
332 | strcpy(buf + length, "\n"); | |
333 | ||
334 | return length + 1; | |
335 | } | |
336 | ||
19a15b93 | 337 | static ssize_t |
21351dbe KH |
338 | rom_index_show(struct device *dev, |
339 | struct device_attribute *attr, char *buf) | |
19a15b93 | 340 | { |
21351dbe KH |
341 | struct fw_device *device = fw_device(dev->parent); |
342 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 343 | |
21351dbe KH |
344 | return snprintf(buf, PAGE_SIZE, "%d\n", |
345 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
346 | } |
347 | ||
21351dbe KH |
348 | static struct device_attribute fw_unit_attributes[] = { |
349 | __ATTR_RO(modalias), | |
350 | __ATTR_RO(rom_index), | |
351 | __ATTR_NULL, | |
19a15b93 KH |
352 | }; |
353 | ||
048961ef | 354 | static ssize_t |
bbd14945 | 355 | config_rom_show(struct device *dev, struct device_attribute *attr, char *buf) |
048961ef | 356 | { |
21351dbe | 357 | struct fw_device *device = fw_device(dev); |
c9755e14 | 358 | size_t length; |
048961ef | 359 | |
c9755e14 SR |
360 | down_read(&fw_device_rwsem); |
361 | length = device->config_rom_length * 4; | |
362 | memcpy(buf, device->config_rom, length); | |
363 | up_read(&fw_device_rwsem); | |
21351dbe | 364 | |
c9755e14 | 365 | return length; |
048961ef KH |
366 | } |
367 | ||
bbd14945 KH |
368 | static ssize_t |
369 | guid_show(struct device *dev, struct device_attribute *attr, char *buf) | |
370 | { | |
371 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
372 | int ret; |
373 | ||
374 | down_read(&fw_device_rwsem); | |
375 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
376 | device->config_rom[3], device->config_rom[4]); | |
377 | up_read(&fw_device_rwsem); | |
bbd14945 | 378 | |
c9755e14 | 379 | return ret; |
bbd14945 KH |
380 | } |
381 | ||
21351dbe KH |
382 | static struct device_attribute fw_device_attributes[] = { |
383 | __ATTR_RO(config_rom), | |
bbd14945 | 384 | __ATTR_RO(guid), |
21351dbe | 385 | __ATTR_NULL, |
048961ef KH |
386 | }; |
387 | ||
f8d2dc39 SR |
388 | static int |
389 | read_rom(struct fw_device *device, int generation, int index, u32 *data) | |
19a15b93 | 390 | { |
1e119fa9 | 391 | int rcode; |
b5d2a5e0 SR |
392 | |
393 | /* device->node_id, accessed below, must not be older than generation */ | |
394 | smp_rmb(); | |
19a15b93 | 395 | |
1e119fa9 | 396 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 397 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
398 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
399 | data, 4); | |
400 | be32_to_cpus(data); | |
19a15b93 | 401 | |
1e119fa9 | 402 | return rcode; |
19a15b93 KH |
403 | } |
404 | ||
1dadff71 SR |
405 | #define READ_BIB_ROM_SIZE 256 |
406 | #define READ_BIB_STACK_SIZE 16 | |
407 | ||
f8d2dc39 SR |
408 | /* |
409 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
410 | * the config ROM. We do all this with a cached bus generation. If the bus | |
411 | * generation changes under us, read_bus_info_block will fail and get retried. | |
412 | * It's better to start all over in this case because the node from which we | |
413 | * are reading the ROM may have changed the ROM during the reset. | |
414 | */ | |
415 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 416 | { |
c9755e14 | 417 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
418 | u32 sp, key; |
419 | int i, end, length, ret = -1; | |
420 | ||
421 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
422 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
423 | if (rom == NULL) | |
424 | return -ENOMEM; | |
425 | ||
426 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 427 | |
f1397490 SR |
428 | device->max_speed = SCODE_100; |
429 | ||
19a15b93 KH |
430 | /* First read the bus info block. */ |
431 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 432 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 433 | goto out; |
c781c06d KH |
434 | /* |
435 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
436 | * reply with a 0 for the first quadlet of the config |
437 | * rom to indicate that they are booting (for example, | |
438 | * if the firmware is on the disk of a external | |
439 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
440 | * retry mechanism will try again later. |
441 | */ | |
19a15b93 | 442 | if (i == 0 && rom[i] == 0) |
1dadff71 | 443 | goto out; |
19a15b93 KH |
444 | } |
445 | ||
f1397490 SR |
446 | device->max_speed = device->node->max_speed; |
447 | ||
448 | /* | |
449 | * Determine the speed of | |
450 | * - devices with link speed less than PHY speed, | |
451 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
452 | * - all devices if there are 1394b repeaters. | |
453 | * Note, we cannot use the bus info block's link_spd as starting point | |
454 | * because some buggy firmwares set it lower than necessary and because | |
455 | * 1394-1995 nodes do not have the field. | |
456 | */ | |
457 | if ((rom[2] & 0x7) < device->max_speed || | |
458 | device->max_speed == SCODE_BETA || | |
459 | device->card->beta_repeaters_present) { | |
460 | u32 dummy; | |
461 | ||
462 | /* for S1600 and S3200 */ | |
463 | if (device->max_speed == SCODE_BETA) | |
464 | device->max_speed = device->card->link_speed; | |
465 | ||
466 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
467 | if (read_rom(device, generation, 0, &dummy) == |
468 | RCODE_COMPLETE) | |
f1397490 SR |
469 | break; |
470 | device->max_speed--; | |
471 | } | |
472 | } | |
473 | ||
c781c06d KH |
474 | /* |
475 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
476 | * directory structure so we parse it using a stack of |
477 | * references to the blocks that make up the structure. We | |
478 | * push a reference to the root directory on the stack to | |
c781c06d KH |
479 | * start things off. |
480 | */ | |
19a15b93 KH |
481 | length = i; |
482 | sp = 0; | |
483 | stack[sp++] = 0xc0000005; | |
484 | while (sp > 0) { | |
c781c06d KH |
485 | /* |
486 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
487 | * lower 24 bits is the offset into the config rom, |
488 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
489 | * block. |
490 | */ | |
19a15b93 KH |
491 | key = stack[--sp]; |
492 | i = key & 0xffffff; | |
1dadff71 | 493 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
494 | /* |
495 | * The reference points outside the standard | |
496 | * config rom area, something's fishy. | |
497 | */ | |
1dadff71 | 498 | goto out; |
19a15b93 KH |
499 | |
500 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 501 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 502 | goto out; |
19a15b93 KH |
503 | end = i + (rom[i] >> 16) + 1; |
504 | i++; | |
1dadff71 | 505 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
506 | /* |
507 | * This block extends outside standard config | |
19a15b93 KH |
508 | * area (and the array we're reading it |
509 | * into). That's broken, so ignore this | |
c781c06d KH |
510 | * device. |
511 | */ | |
1dadff71 | 512 | goto out; |
19a15b93 | 513 | |
c781c06d KH |
514 | /* |
515 | * Now read in the block. If this is a directory | |
19a15b93 | 516 | * block, check the entries as we read them to see if |
c781c06d KH |
517 | * it references another block, and push it in that case. |
518 | */ | |
19a15b93 | 519 | while (i < end) { |
f8d2dc39 SR |
520 | if (read_rom(device, generation, i, &rom[i]) != |
521 | RCODE_COMPLETE) | |
1dadff71 | 522 | goto out; |
19a15b93 | 523 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 524 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
525 | stack[sp++] = i + rom[i]; |
526 | i++; | |
527 | } | |
528 | if (length < i) | |
529 | length = i; | |
530 | } | |
531 | ||
c9755e14 SR |
532 | old_rom = device->config_rom; |
533 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
534 | if (new_rom == NULL) | |
1dadff71 | 535 | goto out; |
c9755e14 SR |
536 | |
537 | down_write(&fw_device_rwsem); | |
538 | device->config_rom = new_rom; | |
19a15b93 | 539 | device->config_rom_length = length; |
c9755e14 SR |
540 | up_write(&fw_device_rwsem); |
541 | ||
542 | kfree(old_rom); | |
1dadff71 | 543 | ret = 0; |
c9755e14 | 544 | device->cmc = rom[2] & 1 << 30; |
1dadff71 SR |
545 | out: |
546 | kfree(rom); | |
19a15b93 | 547 | |
1dadff71 | 548 | return ret; |
19a15b93 KH |
549 | } |
550 | ||
551 | static void fw_unit_release(struct device *dev) | |
552 | { | |
553 | struct fw_unit *unit = fw_unit(dev); | |
554 | ||
555 | kfree(unit); | |
556 | } | |
557 | ||
21351dbe | 558 | static struct device_type fw_unit_type = { |
21351dbe KH |
559 | .uevent = fw_unit_uevent, |
560 | .release = fw_unit_release, | |
561 | }; | |
562 | ||
19a15b93 KH |
563 | static int is_fw_unit(struct device *dev) |
564 | { | |
21351dbe | 565 | return dev->type == &fw_unit_type; |
19a15b93 KH |
566 | } |
567 | ||
568 | static void create_units(struct fw_device *device) | |
569 | { | |
570 | struct fw_csr_iterator ci; | |
571 | struct fw_unit *unit; | |
572 | int key, value, i; | |
573 | ||
574 | i = 0; | |
575 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
576 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
577 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
578 | continue; | |
579 | ||
c781c06d KH |
580 | /* |
581 | * Get the address of the unit directory and try to | |
582 | * match the drivers id_tables against it. | |
583 | */ | |
2d826cc5 | 584 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
585 | if (unit == NULL) { |
586 | fw_error("failed to allocate memory for unit\n"); | |
587 | continue; | |
588 | } | |
589 | ||
590 | unit->directory = ci.p + value - 1; | |
591 | unit->device.bus = &fw_bus_type; | |
21351dbe | 592 | unit->device.type = &fw_unit_type; |
19a15b93 | 593 | unit->device.parent = &device->device; |
a1f64819 | 594 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 595 | |
6f2e53d5 KH |
596 | init_fw_attribute_group(&unit->device, |
597 | fw_unit_attributes, | |
598 | &unit->attribute_group); | |
7feb9cce KH |
599 | if (device_register(&unit->device) < 0) |
600 | goto skip_unit; | |
601 | ||
7feb9cce KH |
602 | continue; |
603 | ||
7feb9cce KH |
604 | skip_unit: |
605 | kfree(unit); | |
19a15b93 KH |
606 | } |
607 | } | |
608 | ||
609 | static int shutdown_unit(struct device *device, void *data) | |
610 | { | |
21351dbe | 611 | device_unregister(device); |
19a15b93 KH |
612 | |
613 | return 0; | |
614 | } | |
615 | ||
c9755e14 SR |
616 | /* |
617 | * fw_device_rwsem acts as dual purpose mutex: | |
618 | * - serializes accesses to fw_device_idr, | |
619 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
620 | * fw_unit.directory, unless those accesses happen at safe occasions | |
621 | */ | |
622 | DECLARE_RWSEM(fw_device_rwsem); | |
623 | ||
d6053e08 | 624 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
625 | int fw_cdev_major; |
626 | ||
96b19062 | 627 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
628 | { |
629 | struct fw_device *device; | |
630 | ||
c9755e14 | 631 | down_read(&fw_device_rwsem); |
a3aca3da | 632 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
633 | if (device) |
634 | fw_device_get(device); | |
c9755e14 | 635 | up_read(&fw_device_rwsem); |
a3aca3da KH |
636 | |
637 | return device; | |
638 | } | |
639 | ||
3d36a0df SR |
640 | /* |
641 | * These defines control the retry behavior for reading the config | |
642 | * rom. It shouldn't be necessary to tweak these; if the device | |
643 | * doesn't respond to a config rom read within 10 seconds, it's not | |
644 | * going to respond at all. As for the initial delay, a lot of | |
645 | * devices will be able to respond within half a second after bus | |
646 | * reset. On the other hand, it's not really worth being more | |
647 | * aggressive than that, since it scales pretty well; if 10 devices | |
648 | * are plugged in, they're all getting read within one second. | |
649 | */ | |
650 | ||
651 | #define MAX_RETRIES 10 | |
652 | #define RETRY_DELAY (3 * HZ) | |
653 | #define INITIAL_DELAY (HZ / 2) | |
654 | #define SHUTDOWN_DELAY (2 * HZ) | |
655 | ||
19a15b93 KH |
656 | static void fw_device_shutdown(struct work_struct *work) |
657 | { | |
658 | struct fw_device *device = | |
659 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
660 | int minor = MINOR(device->device.devt); |
661 | ||
e747a5c0 SR |
662 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
663 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
664 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
665 | return; | |
666 | } | |
667 | ||
668 | if (atomic_cmpxchg(&device->state, | |
669 | FW_DEVICE_GONE, | |
670 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
671 | return; | |
672 | ||
2603bf21 | 673 | fw_device_cdev_remove(device); |
19a15b93 KH |
674 | device_for_each_child(&device->device, NULL, shutdown_unit); |
675 | device_unregister(&device->device); | |
96b19062 | 676 | |
c9755e14 | 677 | down_write(&fw_device_rwsem); |
96b19062 | 678 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 679 | up_write(&fw_device_rwsem); |
3d36a0df | 680 | |
96b19062 | 681 | fw_device_put(device); |
19a15b93 KH |
682 | } |
683 | ||
21351dbe | 684 | static struct device_type fw_device_type = { |
21351dbe KH |
685 | .release = fw_device_release, |
686 | }; | |
687 | ||
3d36a0df SR |
688 | static void fw_device_update(struct work_struct *work); |
689 | ||
c781c06d | 690 | /* |
3d36a0df SR |
691 | * If a device was pending for deletion because its node went away but its |
692 | * bus info block and root directory header matches that of a newly discovered | |
693 | * device, revive the existing fw_device. | |
694 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 695 | */ |
3d36a0df SR |
696 | static int lookup_existing_device(struct device *dev, void *data) |
697 | { | |
698 | struct fw_device *old = fw_device(dev); | |
699 | struct fw_device *new = data; | |
700 | struct fw_card *card = new->card; | |
701 | int match = 0; | |
702 | ||
703 | down_read(&fw_device_rwsem); /* serialize config_rom access */ | |
704 | spin_lock_irq(&card->lock); /* serialize node access */ | |
705 | ||
706 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
707 | atomic_cmpxchg(&old->state, | |
708 | FW_DEVICE_GONE, | |
709 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
710 | struct fw_node *current_node = new->node; | |
711 | struct fw_node *obsolete_node = old->node; | |
712 | ||
713 | new->node = obsolete_node; | |
714 | new->node->data = new; | |
715 | old->node = current_node; | |
716 | old->node->data = old; | |
717 | ||
718 | old->max_speed = new->max_speed; | |
719 | old->node_id = current_node->node_id; | |
720 | smp_wmb(); /* update node_id before generation */ | |
721 | old->generation = card->generation; | |
722 | old->config_rom_retries = 0; | |
723 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 724 | |
3d36a0df SR |
725 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
726 | schedule_delayed_work(&old->work, 0); | |
727 | ||
728 | if (current_node == card->root_node) | |
729 | fw_schedule_bm_work(card, 0); | |
730 | ||
731 | match = 1; | |
732 | } | |
733 | ||
734 | spin_unlock_irq(&card->lock); | |
735 | up_read(&fw_device_rwsem); | |
736 | ||
737 | return match; | |
738 | } | |
19a15b93 KH |
739 | |
740 | static void fw_device_init(struct work_struct *work) | |
741 | { | |
19a15b93 KH |
742 | struct fw_device *device = |
743 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 744 | struct device *revived_dev; |
a3aca3da | 745 | int minor, err; |
19a15b93 | 746 | |
c781c06d KH |
747 | /* |
748 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 749 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
750 | * device. |
751 | */ | |
19a15b93 | 752 | |
f8d2dc39 | 753 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
754 | if (device->config_rom_retries < MAX_RETRIES && |
755 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
756 | device->config_rom_retries++; |
757 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
758 | } else { | |
907293d7 | 759 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 760 | device->node_id); |
931c4834 | 761 | if (device->node == device->card->root_node) |
0fa1986f | 762 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
763 | fw_device_release(&device->device); |
764 | } | |
765 | return; | |
766 | } | |
767 | ||
3d36a0df SR |
768 | revived_dev = device_find_child(device->card->device, |
769 | device, lookup_existing_device); | |
770 | if (revived_dev) { | |
771 | put_device(revived_dev); | |
772 | fw_device_release(&device->device); | |
773 | ||
774 | return; | |
775 | } | |
776 | ||
62305823 | 777 | device_initialize(&device->device); |
96b19062 SR |
778 | |
779 | fw_device_get(device); | |
c9755e14 | 780 | down_write(&fw_device_rwsem); |
62305823 SR |
781 | err = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
782 | idr_get_new(&fw_device_idr, device, &minor) : | |
783 | -ENOMEM; | |
c9755e14 | 784 | up_write(&fw_device_rwsem); |
96b19062 | 785 | |
a3aca3da KH |
786 | if (err < 0) |
787 | goto error; | |
788 | ||
19a15b93 | 789 | device->device.bus = &fw_bus_type; |
21351dbe | 790 | device->device.type = &fw_device_type; |
19a15b93 | 791 | device->device.parent = device->card->device; |
a3aca3da | 792 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 793 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 794 | |
6f2e53d5 KH |
795 | init_fw_attribute_group(&device->device, |
796 | fw_device_attributes, | |
797 | &device->attribute_group); | |
19a15b93 KH |
798 | if (device_add(&device->device)) { |
799 | fw_error("Failed to add device.\n"); | |
a3aca3da | 800 | goto error_with_cdev; |
19a15b93 KH |
801 | } |
802 | ||
19a15b93 KH |
803 | create_units(device); |
804 | ||
c781c06d KH |
805 | /* |
806 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
807 | * out from under us while we did the intialization work, we |
808 | * have to shut down the device again here. Normally, though, | |
809 | * fw_node_event will be responsible for shutting it down when | |
810 | * necessary. We have to use the atomic cmpxchg here to avoid | |
811 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
812 | * fw_node_event(). |
813 | */ | |
641f8791 | 814 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
815 | FW_DEVICE_INITIALIZING, |
816 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
817 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
818 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
819 | } else { |
820 | if (device->config_rom_retries) | |
821 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
822 | "%d config ROM retries\n", | |
a1f64819 | 823 | dev_name(&device->device), |
fa6e697b SR |
824 | device->config_rom[3], device->config_rom[4], |
825 | 1 << device->max_speed, | |
826 | device->config_rom_retries); | |
827 | else | |
828 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 829 | dev_name(&device->device), |
fa6e697b SR |
830 | device->config_rom[3], device->config_rom[4], |
831 | 1 << device->max_speed); | |
c9755e14 | 832 | device->config_rom_retries = 0; |
fa6e697b | 833 | } |
19a15b93 | 834 | |
c781c06d KH |
835 | /* |
836 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
837 | * root node config rom. If this races with a bus reset we |
838 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
839 | * pretty harmless. |
840 | */ | |
19a15b93 | 841 | if (device->node == device->card->root_node) |
0fa1986f | 842 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
843 | |
844 | return; | |
845 | ||
a3aca3da | 846 | error_with_cdev: |
c9755e14 | 847 | down_write(&fw_device_rwsem); |
a3aca3da | 848 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 849 | up_write(&fw_device_rwsem); |
373b2edd | 850 | error: |
96b19062 SR |
851 | fw_device_put(device); /* fw_device_idr's reference */ |
852 | ||
853 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
854 | } |
855 | ||
856 | static int update_unit(struct device *dev, void *data) | |
857 | { | |
858 | struct fw_unit *unit = fw_unit(dev); | |
859 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
860 | ||
015b066f KH |
861 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
862 | down(&dev->sem); | |
19a15b93 | 863 | driver->update(unit); |
015b066f KH |
864 | up(&dev->sem); |
865 | } | |
19a15b93 KH |
866 | |
867 | return 0; | |
868 | } | |
869 | ||
5f480477 KH |
870 | static void fw_device_update(struct work_struct *work) |
871 | { | |
872 | struct fw_device *device = | |
873 | container_of(work, struct fw_device, work.work); | |
874 | ||
97bd9efa | 875 | fw_device_cdev_update(device); |
5f480477 KH |
876 | device_for_each_child(&device->device, NULL, update_unit); |
877 | } | |
878 | ||
c9755e14 SR |
879 | enum { |
880 | REREAD_BIB_ERROR, | |
881 | REREAD_BIB_GONE, | |
882 | REREAD_BIB_UNCHANGED, | |
883 | REREAD_BIB_CHANGED, | |
884 | }; | |
885 | ||
886 | /* Reread and compare bus info block and header of root directory */ | |
887 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
888 | { | |
889 | u32 q; | |
890 | int i; | |
891 | ||
892 | for (i = 0; i < 6; i++) { | |
893 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
894 | return REREAD_BIB_ERROR; | |
895 | ||
896 | if (i == 0 && q == 0) | |
897 | return REREAD_BIB_GONE; | |
898 | ||
899 | if (i > device->config_rom_length || q != device->config_rom[i]) | |
900 | return REREAD_BIB_CHANGED; | |
901 | } | |
902 | ||
903 | return REREAD_BIB_UNCHANGED; | |
904 | } | |
905 | ||
906 | static void fw_device_refresh(struct work_struct *work) | |
907 | { | |
908 | struct fw_device *device = | |
909 | container_of(work, struct fw_device, work.work); | |
910 | struct fw_card *card = device->card; | |
911 | int node_id = device->node_id; | |
912 | ||
913 | switch (reread_bus_info_block(device, device->generation)) { | |
914 | case REREAD_BIB_ERROR: | |
915 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
916 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
917 | device->config_rom_retries++; | |
918 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
919 | ||
920 | return; | |
921 | } | |
922 | goto give_up; | |
923 | ||
924 | case REREAD_BIB_GONE: | |
925 | goto gone; | |
926 | ||
927 | case REREAD_BIB_UNCHANGED: | |
928 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
929 | FW_DEVICE_INITIALIZING, |
930 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
931 | goto gone; |
932 | ||
933 | fw_device_update(work); | |
934 | device->config_rom_retries = 0; | |
935 | goto out; | |
936 | ||
937 | case REREAD_BIB_CHANGED: | |
938 | break; | |
939 | } | |
940 | ||
941 | /* | |
942 | * Something changed. We keep things simple and don't investigate | |
943 | * further. We just destroy all previous units and create new ones. | |
944 | */ | |
945 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
946 | ||
947 | if (read_bus_info_block(device, device->generation) < 0) { | |
948 | if (device->config_rom_retries < MAX_RETRIES && | |
949 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
950 | device->config_rom_retries++; | |
951 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
952 | ||
953 | return; | |
954 | } | |
955 | goto give_up; | |
956 | } | |
957 | ||
958 | create_units(device); | |
959 | ||
960 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
961 | FW_DEVICE_INITIALIZING, |
962 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
963 | goto gone; |
964 | ||
a1f64819 | 965 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
966 | device->config_rom_retries = 0; |
967 | goto out; | |
968 | ||
969 | give_up: | |
a1f64819 | 970 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 971 | gone: |
3d36a0df SR |
972 | atomic_set(&device->state, FW_DEVICE_GONE); |
973 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
974 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
975 | out: |
976 | if (node_id == card->root_node->node_id) | |
0fa1986f | 977 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
978 | } |
979 | ||
19a15b93 KH |
980 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
981 | { | |
982 | struct fw_device *device; | |
983 | ||
19a15b93 KH |
984 | switch (event) { |
985 | case FW_NODE_CREATED: | |
986 | case FW_NODE_LINK_ON: | |
987 | if (!node->link_on) | |
988 | break; | |
c9755e14 | 989 | create: |
19a15b93 KH |
990 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
991 | if (device == NULL) | |
992 | break; | |
993 | ||
c781c06d KH |
994 | /* |
995 | * Do minimal intialization of the device here, the | |
62305823 SR |
996 | * rest will happen in fw_device_init(). |
997 | * | |
998 | * Attention: A lot of things, even fw_device_get(), | |
999 | * cannot be done before fw_device_init() finished! | |
1000 | * You can basically just check device->state and | |
1001 | * schedule work until then, but only while holding | |
1002 | * card->lock. | |
c781c06d | 1003 | */ |
641f8791 | 1004 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1005 | device->card = fw_card_get(card); |
19a15b93 KH |
1006 | device->node = fw_node_get(node); |
1007 | device->node_id = node->node_id; | |
1008 | device->generation = card->generation; | |
d67cfb96 | 1009 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1010 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1011 | |
c781c06d KH |
1012 | /* |
1013 | * Set the node data to point back to this device so | |
19a15b93 | 1014 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1015 | * and generation for the device. |
1016 | */ | |
19a15b93 KH |
1017 | node->data = device; |
1018 | ||
c781c06d KH |
1019 | /* |
1020 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1021 | * especially if they are bus powered and go through |
1022 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1023 | * first config rom scan half a second after bus reset. |
1024 | */ | |
19a15b93 KH |
1025 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1026 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1027 | break; | |
1028 | ||
c9755e14 SR |
1029 | case FW_NODE_INITIATED_RESET: |
1030 | device = node->data; | |
1031 | if (device == NULL) | |
1032 | goto create; | |
1033 | ||
1034 | device->node_id = node->node_id; | |
1035 | smp_wmb(); /* update node_id before generation */ | |
1036 | device->generation = card->generation; | |
1037 | if (atomic_cmpxchg(&device->state, | |
1038 | FW_DEVICE_RUNNING, | |
1039 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1040 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1041 | schedule_delayed_work(&device->work, | |
1042 | node == card->local_node ? 0 : INITIAL_DELAY); | |
1043 | } | |
1044 | break; | |
1045 | ||
19a15b93 KH |
1046 | case FW_NODE_UPDATED: |
1047 | if (!node->link_on || node->data == NULL) | |
1048 | break; | |
1049 | ||
1050 | device = node->data; | |
1051 | device->node_id = node->node_id; | |
b5d2a5e0 | 1052 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1053 | device->generation = card->generation; |
5f480477 KH |
1054 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1055 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1056 | schedule_delayed_work(&device->work, 0); | |
1057 | } | |
19a15b93 KH |
1058 | break; |
1059 | ||
1060 | case FW_NODE_DESTROYED: | |
1061 | case FW_NODE_LINK_OFF: | |
1062 | if (!node->data) | |
1063 | break; | |
1064 | ||
c781c06d KH |
1065 | /* |
1066 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1067 | * are two cases here: either the device is fully |
1068 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1069 | * process of reading its config rom | |
1070 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1071 | * initialized we can reuse device->work to schedule a | |
1072 | * full fw_device_shutdown(). If not, there's work | |
1073 | * scheduled to read it's config rom, and we just put | |
1074 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1075 | * to create the device. |
1076 | */ | |
19a15b93 | 1077 | device = node->data; |
641f8791 | 1078 | if (atomic_xchg(&device->state, |
3d36a0df | 1079 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1080 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1081 | schedule_delayed_work(&device->work, |
1082 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1083 | } |
1084 | break; | |
1085 | } | |
1086 | } |