Root/
1 | /* |
2 | * Device probing and sysfs code. |
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/bug.h> |
22 | #include <linux/ctype.h> |
23 | #include <linux/delay.h> |
24 | #include <linux/device.h> |
25 | #include <linux/errno.h> |
26 | #include <linux/firewire.h> |
27 | #include <linux/firewire-constants.h> |
28 | #include <linux/idr.h> |
29 | #include <linux/jiffies.h> |
30 | #include <linux/kobject.h> |
31 | #include <linux/list.h> |
32 | #include <linux/mod_devicetable.h> |
33 | #include <linux/module.h> |
34 | #include <linux/mutex.h> |
35 | #include <linux/random.h> |
36 | #include <linux/rwsem.h> |
37 | #include <linux/slab.h> |
38 | #include <linux/spinlock.h> |
39 | #include <linux/string.h> |
40 | #include <linux/workqueue.h> |
41 | |
42 | #include <linux/atomic.h> |
43 | #include <asm/byteorder.h> |
44 | |
45 | #include "core.h" |
46 | |
47 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p) |
48 | { |
49 | ci->p = p + 1; |
50 | ci->end = ci->p + (p[0] >> 16); |
51 | } |
52 | EXPORT_SYMBOL(fw_csr_iterator_init); |
53 | |
54 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) |
55 | { |
56 | *key = *ci->p >> 24; |
57 | *value = *ci->p & 0xffffff; |
58 | |
59 | return ci->p++ < ci->end; |
60 | } |
61 | EXPORT_SYMBOL(fw_csr_iterator_next); |
62 | |
63 | static const u32 *search_leaf(const u32 *directory, int search_key) |
64 | { |
65 | struct fw_csr_iterator ci; |
66 | int last_key = 0, key, value; |
67 | |
68 | fw_csr_iterator_init(&ci, directory); |
69 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
70 | if (last_key == search_key && |
71 | key == (CSR_DESCRIPTOR | CSR_LEAF)) |
72 | return ci.p - 1 + value; |
73 | |
74 | last_key = key; |
75 | } |
76 | |
77 | return NULL; |
78 | } |
79 | |
80 | static int textual_leaf_to_string(const u32 *block, char *buf, size_t size) |
81 | { |
82 | unsigned int quadlets, i; |
83 | char c; |
84 | |
85 | if (!size || !buf) |
86 | return -EINVAL; |
87 | |
88 | quadlets = min(block[0] >> 16, 256U); |
89 | if (quadlets < 2) |
90 | return -ENODATA; |
91 | |
92 | if (block[1] != 0 || block[2] != 0) |
93 | /* unknown language/character set */ |
94 | return -ENODATA; |
95 | |
96 | block += 3; |
97 | quadlets -= 2; |
98 | for (i = 0; i < quadlets * 4 && i < size - 1; i++) { |
99 | c = block[i / 4] >> (24 - 8 * (i % 4)); |
100 | if (c == '\0') |
101 | break; |
102 | buf[i] = c; |
103 | } |
104 | buf[i] = '\0'; |
105 | |
106 | return i; |
107 | } |
108 | |
109 | /** |
110 | * fw_csr_string() - reads a string from the configuration ROM |
111 | * @directory: e.g. root directory or unit directory |
112 | * @key: the key of the preceding directory entry |
113 | * @buf: where to put the string |
114 | * @size: size of @buf, in bytes |
115 | * |
116 | * The string is taken from a minimal ASCII text descriptor leaf after |
117 | * the immediate entry with @key. The string is zero-terminated. |
118 | * Returns strlen(buf) or a negative error code. |
119 | */ |
120 | int fw_csr_string(const u32 *directory, int key, char *buf, size_t size) |
121 | { |
122 | const u32 *leaf = search_leaf(directory, key); |
123 | if (!leaf) |
124 | return -ENOENT; |
125 | |
126 | return textual_leaf_to_string(leaf, buf, size); |
127 | } |
128 | EXPORT_SYMBOL(fw_csr_string); |
129 | |
130 | static void get_ids(const u32 *directory, int *id) |
131 | { |
132 | struct fw_csr_iterator ci; |
133 | int key, value; |
134 | |
135 | fw_csr_iterator_init(&ci, directory); |
136 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
137 | switch (key) { |
138 | case CSR_VENDOR: id[0] = value; break; |
139 | case CSR_MODEL: id[1] = value; break; |
140 | case CSR_SPECIFIER_ID: id[2] = value; break; |
141 | case CSR_VERSION: id[3] = value; break; |
142 | } |
143 | } |
144 | } |
145 | |
146 | static void get_modalias_ids(struct fw_unit *unit, int *id) |
147 | { |
148 | get_ids(&fw_parent_device(unit)->config_rom[5], id); |
149 | get_ids(unit->directory, id); |
150 | } |
151 | |
152 | static bool match_ids(const struct ieee1394_device_id *id_table, int *id) |
153 | { |
154 | int match = 0; |
155 | |
156 | if (id[0] == id_table->vendor_id) |
157 | match |= IEEE1394_MATCH_VENDOR_ID; |
158 | if (id[1] == id_table->model_id) |
159 | match |= IEEE1394_MATCH_MODEL_ID; |
160 | if (id[2] == id_table->specifier_id) |
161 | match |= IEEE1394_MATCH_SPECIFIER_ID; |
162 | if (id[3] == id_table->version) |
163 | match |= IEEE1394_MATCH_VERSION; |
164 | |
165 | return (match & id_table->match_flags) == id_table->match_flags; |
166 | } |
167 | |
168 | static bool is_fw_unit(struct device *dev); |
169 | |
170 | static int fw_unit_match(struct device *dev, struct device_driver *drv) |
171 | { |
172 | const struct ieee1394_device_id *id_table = |
173 | container_of(drv, struct fw_driver, driver)->id_table; |
174 | int id[] = {0, 0, 0, 0}; |
175 | |
176 | /* We only allow binding to fw_units. */ |
177 | if (!is_fw_unit(dev)) |
178 | return 0; |
179 | |
180 | get_modalias_ids(fw_unit(dev), id); |
181 | |
182 | for (; id_table->match_flags != 0; id_table++) |
183 | if (match_ids(id_table, id)) |
184 | return 1; |
185 | |
186 | return 0; |
187 | } |
188 | |
189 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) |
190 | { |
191 | int id[] = {0, 0, 0, 0}; |
192 | |
193 | get_modalias_ids(unit, id); |
194 | |
195 | return snprintf(buffer, buffer_size, |
196 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", |
197 | id[0], id[1], id[2], id[3]); |
198 | } |
199 | |
200 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
201 | { |
202 | struct fw_unit *unit = fw_unit(dev); |
203 | char modalias[64]; |
204 | |
205 | get_modalias(unit, modalias, sizeof(modalias)); |
206 | |
207 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
208 | return -ENOMEM; |
209 | |
210 | return 0; |
211 | } |
212 | |
213 | struct bus_type fw_bus_type = { |
214 | .name = "firewire", |
215 | .match = fw_unit_match, |
216 | }; |
217 | EXPORT_SYMBOL(fw_bus_type); |
218 | |
219 | int fw_device_enable_phys_dma(struct fw_device *device) |
220 | { |
221 | int generation = device->generation; |
222 | |
223 | /* device->node_id, accessed below, must not be older than generation */ |
224 | smp_rmb(); |
225 | |
226 | return device->card->driver->enable_phys_dma(device->card, |
227 | device->node_id, |
228 | generation); |
229 | } |
230 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
231 | |
232 | struct config_rom_attribute { |
233 | struct device_attribute attr; |
234 | u32 key; |
235 | }; |
236 | |
237 | static ssize_t show_immediate(struct device *dev, |
238 | struct device_attribute *dattr, char *buf) |
239 | { |
240 | struct config_rom_attribute *attr = |
241 | container_of(dattr, struct config_rom_attribute, attr); |
242 | struct fw_csr_iterator ci; |
243 | const u32 *dir; |
244 | int key, value, ret = -ENOENT; |
245 | |
246 | down_read(&fw_device_rwsem); |
247 | |
248 | if (is_fw_unit(dev)) |
249 | dir = fw_unit(dev)->directory; |
250 | else |
251 | dir = fw_device(dev)->config_rom + 5; |
252 | |
253 | fw_csr_iterator_init(&ci, dir); |
254 | while (fw_csr_iterator_next(&ci, &key, &value)) |
255 | if (attr->key == key) { |
256 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, |
257 | "0x%06x\n", value); |
258 | break; |
259 | } |
260 | |
261 | up_read(&fw_device_rwsem); |
262 | |
263 | return ret; |
264 | } |
265 | |
266 | #define IMMEDIATE_ATTR(name, key) \ |
267 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } |
268 | |
269 | static ssize_t show_text_leaf(struct device *dev, |
270 | struct device_attribute *dattr, char *buf) |
271 | { |
272 | struct config_rom_attribute *attr = |
273 | container_of(dattr, struct config_rom_attribute, attr); |
274 | const u32 *dir; |
275 | size_t bufsize; |
276 | char dummy_buf[2]; |
277 | int ret; |
278 | |
279 | down_read(&fw_device_rwsem); |
280 | |
281 | if (is_fw_unit(dev)) |
282 | dir = fw_unit(dev)->directory; |
283 | else |
284 | dir = fw_device(dev)->config_rom + 5; |
285 | |
286 | if (buf) { |
287 | bufsize = PAGE_SIZE - 1; |
288 | } else { |
289 | buf = dummy_buf; |
290 | bufsize = 1; |
291 | } |
292 | |
293 | ret = fw_csr_string(dir, attr->key, buf, bufsize); |
294 | |
295 | if (ret >= 0) { |
296 | /* Strip trailing whitespace and add newline. */ |
297 | while (ret > 0 && isspace(buf[ret - 1])) |
298 | ret--; |
299 | strcpy(buf + ret, "\n"); |
300 | ret++; |
301 | } |
302 | |
303 | up_read(&fw_device_rwsem); |
304 | |
305 | return ret; |
306 | } |
307 | |
308 | #define TEXT_LEAF_ATTR(name, key) \ |
309 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } |
310 | |
311 | static struct config_rom_attribute config_rom_attributes[] = { |
312 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), |
313 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), |
314 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), |
315 | IMMEDIATE_ATTR(version, CSR_VERSION), |
316 | IMMEDIATE_ATTR(model, CSR_MODEL), |
317 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), |
318 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), |
319 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), |
320 | }; |
321 | |
322 | static void init_fw_attribute_group(struct device *dev, |
323 | struct device_attribute *attrs, |
324 | struct fw_attribute_group *group) |
325 | { |
326 | struct device_attribute *attr; |
327 | int i, j; |
328 | |
329 | for (j = 0; attrs[j].attr.name != NULL; j++) |
330 | group->attrs[j] = &attrs[j].attr; |
331 | |
332 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { |
333 | attr = &config_rom_attributes[i].attr; |
334 | if (attr->show(dev, attr, NULL) < 0) |
335 | continue; |
336 | group->attrs[j++] = &attr->attr; |
337 | } |
338 | |
339 | group->attrs[j] = NULL; |
340 | group->groups[0] = &group->group; |
341 | group->groups[1] = NULL; |
342 | group->group.attrs = group->attrs; |
343 | dev->groups = (const struct attribute_group **) group->groups; |
344 | } |
345 | |
346 | static ssize_t modalias_show(struct device *dev, |
347 | struct device_attribute *attr, char *buf) |
348 | { |
349 | struct fw_unit *unit = fw_unit(dev); |
350 | int length; |
351 | |
352 | length = get_modalias(unit, buf, PAGE_SIZE); |
353 | strcpy(buf + length, "\n"); |
354 | |
355 | return length + 1; |
356 | } |
357 | |
358 | static ssize_t rom_index_show(struct device *dev, |
359 | struct device_attribute *attr, char *buf) |
360 | { |
361 | struct fw_device *device = fw_device(dev->parent); |
362 | struct fw_unit *unit = fw_unit(dev); |
363 | |
364 | return snprintf(buf, PAGE_SIZE, "%d\n", |
365 | (int)(unit->directory - device->config_rom)); |
366 | } |
367 | |
368 | static struct device_attribute fw_unit_attributes[] = { |
369 | __ATTR_RO(modalias), |
370 | __ATTR_RO(rom_index), |
371 | __ATTR_NULL, |
372 | }; |
373 | |
374 | static ssize_t config_rom_show(struct device *dev, |
375 | struct device_attribute *attr, char *buf) |
376 | { |
377 | struct fw_device *device = fw_device(dev); |
378 | size_t length; |
379 | |
380 | down_read(&fw_device_rwsem); |
381 | length = device->config_rom_length * 4; |
382 | memcpy(buf, device->config_rom, length); |
383 | up_read(&fw_device_rwsem); |
384 | |
385 | return length; |
386 | } |
387 | |
388 | static ssize_t guid_show(struct device *dev, |
389 | struct device_attribute *attr, char *buf) |
390 | { |
391 | struct fw_device *device = fw_device(dev); |
392 | int ret; |
393 | |
394 | down_read(&fw_device_rwsem); |
395 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", |
396 | device->config_rom[3], device->config_rom[4]); |
397 | up_read(&fw_device_rwsem); |
398 | |
399 | return ret; |
400 | } |
401 | |
402 | static ssize_t is_local_show(struct device *dev, |
403 | struct device_attribute *attr, char *buf) |
404 | { |
405 | struct fw_device *device = fw_device(dev); |
406 | |
407 | return sprintf(buf, "%u\n", device->is_local); |
408 | } |
409 | |
410 | static int units_sprintf(char *buf, const u32 *directory) |
411 | { |
412 | struct fw_csr_iterator ci; |
413 | int key, value; |
414 | int specifier_id = 0; |
415 | int version = 0; |
416 | |
417 | fw_csr_iterator_init(&ci, directory); |
418 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
419 | switch (key) { |
420 | case CSR_SPECIFIER_ID: |
421 | specifier_id = value; |
422 | break; |
423 | case CSR_VERSION: |
424 | version = value; |
425 | break; |
426 | } |
427 | } |
428 | |
429 | return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version); |
430 | } |
431 | |
432 | static ssize_t units_show(struct device *dev, |
433 | struct device_attribute *attr, char *buf) |
434 | { |
435 | struct fw_device *device = fw_device(dev); |
436 | struct fw_csr_iterator ci; |
437 | int key, value, i = 0; |
438 | |
439 | down_read(&fw_device_rwsem); |
440 | fw_csr_iterator_init(&ci, &device->config_rom[5]); |
441 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
442 | if (key != (CSR_UNIT | CSR_DIRECTORY)) |
443 | continue; |
444 | i += units_sprintf(&buf[i], ci.p + value - 1); |
445 | if (i >= PAGE_SIZE - (8 + 1 + 8 + 1)) |
446 | break; |
447 | } |
448 | up_read(&fw_device_rwsem); |
449 | |
450 | if (i) |
451 | buf[i - 1] = '\n'; |
452 | |
453 | return i; |
454 | } |
455 | |
456 | static struct device_attribute fw_device_attributes[] = { |
457 | __ATTR_RO(config_rom), |
458 | __ATTR_RO(guid), |
459 | __ATTR_RO(is_local), |
460 | __ATTR_RO(units), |
461 | __ATTR_NULL, |
462 | }; |
463 | |
464 | static int read_rom(struct fw_device *device, |
465 | int generation, int index, u32 *data) |
466 | { |
467 | u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4; |
468 | int i, rcode; |
469 | |
470 | /* device->node_id, accessed below, must not be older than generation */ |
471 | smp_rmb(); |
472 | |
473 | for (i = 10; i < 100; i += 10) { |
474 | rcode = fw_run_transaction(device->card, |
475 | TCODE_READ_QUADLET_REQUEST, device->node_id, |
476 | generation, device->max_speed, offset, data, 4); |
477 | if (rcode != RCODE_BUSY) |
478 | break; |
479 | msleep(i); |
480 | } |
481 | be32_to_cpus(data); |
482 | |
483 | return rcode; |
484 | } |
485 | |
486 | #define MAX_CONFIG_ROM_SIZE 256 |
487 | |
488 | /* |
489 | * Read the bus info block, perform a speed probe, and read all of the rest of |
490 | * the config ROM. We do all this with a cached bus generation. If the bus |
491 | * generation changes under us, read_config_rom will fail and get retried. |
492 | * It's better to start all over in this case because the node from which we |
493 | * are reading the ROM may have changed the ROM during the reset. |
494 | * Returns either a result code or a negative error code. |
495 | */ |
496 | static int read_config_rom(struct fw_device *device, int generation) |
497 | { |
498 | struct fw_card *card = device->card; |
499 | const u32 *old_rom, *new_rom; |
500 | u32 *rom, *stack; |
501 | u32 sp, key; |
502 | int i, end, length, ret; |
503 | |
504 | rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE + |
505 | sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL); |
506 | if (rom == NULL) |
507 | return -ENOMEM; |
508 | |
509 | stack = &rom[MAX_CONFIG_ROM_SIZE]; |
510 | memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE); |
511 | |
512 | device->max_speed = SCODE_100; |
513 | |
514 | /* First read the bus info block. */ |
515 | for (i = 0; i < 5; i++) { |
516 | ret = read_rom(device, generation, i, &rom[i]); |
517 | if (ret != RCODE_COMPLETE) |
518 | goto out; |
519 | /* |
520 | * As per IEEE1212 7.2, during initialization, devices can |
521 | * reply with a 0 for the first quadlet of the config |
522 | * rom to indicate that they are booting (for example, |
523 | * if the firmware is on the disk of a external |
524 | * harddisk). In that case we just fail, and the |
525 | * retry mechanism will try again later. |
526 | */ |
527 | if (i == 0 && rom[i] == 0) { |
528 | ret = RCODE_BUSY; |
529 | goto out; |
530 | } |
531 | } |
532 | |
533 | device->max_speed = device->node->max_speed; |
534 | |
535 | /* |
536 | * Determine the speed of |
537 | * - devices with link speed less than PHY speed, |
538 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), |
539 | * - all devices if there are 1394b repeaters. |
540 | * Note, we cannot use the bus info block's link_spd as starting point |
541 | * because some buggy firmwares set it lower than necessary and because |
542 | * 1394-1995 nodes do not have the field. |
543 | */ |
544 | if ((rom[2] & 0x7) < device->max_speed || |
545 | device->max_speed == SCODE_BETA || |
546 | card->beta_repeaters_present) { |
547 | u32 dummy; |
548 | |
549 | /* for S1600 and S3200 */ |
550 | if (device->max_speed == SCODE_BETA) |
551 | device->max_speed = card->link_speed; |
552 | |
553 | while (device->max_speed > SCODE_100) { |
554 | if (read_rom(device, generation, 0, &dummy) == |
555 | RCODE_COMPLETE) |
556 | break; |
557 | device->max_speed--; |
558 | } |
559 | } |
560 | |
561 | /* |
562 | * Now parse the config rom. The config rom is a recursive |
563 | * directory structure so we parse it using a stack of |
564 | * references to the blocks that make up the structure. We |
565 | * push a reference to the root directory on the stack to |
566 | * start things off. |
567 | */ |
568 | length = i; |
569 | sp = 0; |
570 | stack[sp++] = 0xc0000005; |
571 | while (sp > 0) { |
572 | /* |
573 | * Pop the next block reference of the stack. The |
574 | * lower 24 bits is the offset into the config rom, |
575 | * the upper 8 bits are the type of the reference the |
576 | * block. |
577 | */ |
578 | key = stack[--sp]; |
579 | i = key & 0xffffff; |
580 | if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) { |
581 | ret = -ENXIO; |
582 | goto out; |
583 | } |
584 | |
585 | /* Read header quadlet for the block to get the length. */ |
586 | ret = read_rom(device, generation, i, &rom[i]); |
587 | if (ret != RCODE_COMPLETE) |
588 | goto out; |
589 | end = i + (rom[i] >> 16) + 1; |
590 | if (end > MAX_CONFIG_ROM_SIZE) { |
591 | /* |
592 | * This block extends outside the config ROM which is |
593 | * a firmware bug. Ignore this whole block, i.e. |
594 | * simply set a fake block length of 0. |
595 | */ |
596 | fw_err(card, "skipped invalid ROM block %x at %llx\n", |
597 | rom[i], |
598 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); |
599 | rom[i] = 0; |
600 | end = i; |
601 | } |
602 | i++; |
603 | |
604 | /* |
605 | * Now read in the block. If this is a directory |
606 | * block, check the entries as we read them to see if |
607 | * it references another block, and push it in that case. |
608 | */ |
609 | for (; i < end; i++) { |
610 | ret = read_rom(device, generation, i, &rom[i]); |
611 | if (ret != RCODE_COMPLETE) |
612 | goto out; |
613 | |
614 | if ((key >> 30) != 3 || (rom[i] >> 30) < 2) |
615 | continue; |
616 | /* |
617 | * Offset points outside the ROM. May be a firmware |
618 | * bug or an Extended ROM entry (IEEE 1212-2001 clause |
619 | * 7.7.18). Simply overwrite this pointer here by a |
620 | * fake immediate entry so that later iterators over |
621 | * the ROM don't have to check offsets all the time. |
622 | */ |
623 | if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) { |
624 | fw_err(card, |
625 | "skipped unsupported ROM entry %x at %llx\n", |
626 | rom[i], |
627 | i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM); |
628 | rom[i] = 0; |
629 | continue; |
630 | } |
631 | stack[sp++] = i + rom[i]; |
632 | } |
633 | if (length < i) |
634 | length = i; |
635 | } |
636 | |
637 | old_rom = device->config_rom; |
638 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); |
639 | if (new_rom == NULL) { |
640 | ret = -ENOMEM; |
641 | goto out; |
642 | } |
643 | |
644 | down_write(&fw_device_rwsem); |
645 | device->config_rom = new_rom; |
646 | device->config_rom_length = length; |
647 | up_write(&fw_device_rwsem); |
648 | |
649 | kfree(old_rom); |
650 | ret = RCODE_COMPLETE; |
651 | device->max_rec = rom[2] >> 12 & 0xf; |
652 | device->cmc = rom[2] >> 30 & 1; |
653 | device->irmc = rom[2] >> 31 & 1; |
654 | out: |
655 | kfree(rom); |
656 | |
657 | return ret; |
658 | } |
659 | |
660 | static void fw_unit_release(struct device *dev) |
661 | { |
662 | struct fw_unit *unit = fw_unit(dev); |
663 | |
664 | fw_device_put(fw_parent_device(unit)); |
665 | kfree(unit); |
666 | } |
667 | |
668 | static struct device_type fw_unit_type = { |
669 | .uevent = fw_unit_uevent, |
670 | .release = fw_unit_release, |
671 | }; |
672 | |
673 | static bool is_fw_unit(struct device *dev) |
674 | { |
675 | return dev->type == &fw_unit_type; |
676 | } |
677 | |
678 | static void create_units(struct fw_device *device) |
679 | { |
680 | struct fw_csr_iterator ci; |
681 | struct fw_unit *unit; |
682 | int key, value, i; |
683 | |
684 | i = 0; |
685 | fw_csr_iterator_init(&ci, &device->config_rom[5]); |
686 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
687 | if (key != (CSR_UNIT | CSR_DIRECTORY)) |
688 | continue; |
689 | |
690 | /* |
691 | * Get the address of the unit directory and try to |
692 | * match the drivers id_tables against it. |
693 | */ |
694 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
695 | if (unit == NULL) { |
696 | fw_err(device->card, "out of memory for unit\n"); |
697 | continue; |
698 | } |
699 | |
700 | unit->directory = ci.p + value - 1; |
701 | unit->device.bus = &fw_bus_type; |
702 | unit->device.type = &fw_unit_type; |
703 | unit->device.parent = &device->device; |
704 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
705 | |
706 | BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) < |
707 | ARRAY_SIZE(fw_unit_attributes) + |
708 | ARRAY_SIZE(config_rom_attributes)); |
709 | init_fw_attribute_group(&unit->device, |
710 | fw_unit_attributes, |
711 | &unit->attribute_group); |
712 | |
713 | if (device_register(&unit->device) < 0) |
714 | goto skip_unit; |
715 | |
716 | fw_device_get(device); |
717 | continue; |
718 | |
719 | skip_unit: |
720 | kfree(unit); |
721 | } |
722 | } |
723 | |
724 | static int shutdown_unit(struct device *device, void *data) |
725 | { |
726 | device_unregister(device); |
727 | |
728 | return 0; |
729 | } |
730 | |
731 | /* |
732 | * fw_device_rwsem acts as dual purpose mutex: |
733 | * - serializes accesses to fw_device_idr, |
734 | * - serializes accesses to fw_device.config_rom/.config_rom_length and |
735 | * fw_unit.directory, unless those accesses happen at safe occasions |
736 | */ |
737 | DECLARE_RWSEM(fw_device_rwsem); |
738 | |
739 | DEFINE_IDR(fw_device_idr); |
740 | int fw_cdev_major; |
741 | |
742 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
743 | { |
744 | struct fw_device *device; |
745 | |
746 | down_read(&fw_device_rwsem); |
747 | device = idr_find(&fw_device_idr, MINOR(devt)); |
748 | if (device) |
749 | fw_device_get(device); |
750 | up_read(&fw_device_rwsem); |
751 | |
752 | return device; |
753 | } |
754 | |
755 | struct workqueue_struct *fw_workqueue; |
756 | EXPORT_SYMBOL(fw_workqueue); |
757 | |
758 | static void fw_schedule_device_work(struct fw_device *device, |
759 | unsigned long delay) |
760 | { |
761 | queue_delayed_work(fw_workqueue, &device->work, delay); |
762 | } |
763 | |
764 | /* |
765 | * These defines control the retry behavior for reading the config |
766 | * rom. It shouldn't be necessary to tweak these; if the device |
767 | * doesn't respond to a config rom read within 10 seconds, it's not |
768 | * going to respond at all. As for the initial delay, a lot of |
769 | * devices will be able to respond within half a second after bus |
770 | * reset. On the other hand, it's not really worth being more |
771 | * aggressive than that, since it scales pretty well; if 10 devices |
772 | * are plugged in, they're all getting read within one second. |
773 | */ |
774 | |
775 | #define MAX_RETRIES 10 |
776 | #define RETRY_DELAY (3 * HZ) |
777 | #define INITIAL_DELAY (HZ / 2) |
778 | #define SHUTDOWN_DELAY (2 * HZ) |
779 | |
780 | static void fw_device_shutdown(struct work_struct *work) |
781 | { |
782 | struct fw_device *device = |
783 | container_of(work, struct fw_device, work.work); |
784 | int minor = MINOR(device->device.devt); |
785 | |
786 | if (time_before64(get_jiffies_64(), |
787 | device->card->reset_jiffies + SHUTDOWN_DELAY) |
788 | && !list_empty(&device->card->link)) { |
789 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
790 | return; |
791 | } |
792 | |
793 | if (atomic_cmpxchg(&device->state, |
794 | FW_DEVICE_GONE, |
795 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) |
796 | return; |
797 | |
798 | fw_device_cdev_remove(device); |
799 | device_for_each_child(&device->device, NULL, shutdown_unit); |
800 | device_unregister(&device->device); |
801 | |
802 | down_write(&fw_device_rwsem); |
803 | idr_remove(&fw_device_idr, minor); |
804 | up_write(&fw_device_rwsem); |
805 | |
806 | fw_device_put(device); |
807 | } |
808 | |
809 | static void fw_device_release(struct device *dev) |
810 | { |
811 | struct fw_device *device = fw_device(dev); |
812 | struct fw_card *card = device->card; |
813 | unsigned long flags; |
814 | |
815 | /* |
816 | * Take the card lock so we don't set this to NULL while a |
817 | * FW_NODE_UPDATED callback is being handled or while the |
818 | * bus manager work looks at this node. |
819 | */ |
820 | spin_lock_irqsave(&card->lock, flags); |
821 | device->node->data = NULL; |
822 | spin_unlock_irqrestore(&card->lock, flags); |
823 | |
824 | fw_node_put(device->node); |
825 | kfree(device->config_rom); |
826 | kfree(device); |
827 | fw_card_put(card); |
828 | } |
829 | |
830 | static struct device_type fw_device_type = { |
831 | .release = fw_device_release, |
832 | }; |
833 | |
834 | static bool is_fw_device(struct device *dev) |
835 | { |
836 | return dev->type == &fw_device_type; |
837 | } |
838 | |
839 | static int update_unit(struct device *dev, void *data) |
840 | { |
841 | struct fw_unit *unit = fw_unit(dev); |
842 | struct fw_driver *driver = (struct fw_driver *)dev->driver; |
843 | |
844 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { |
845 | device_lock(dev); |
846 | driver->update(unit); |
847 | device_unlock(dev); |
848 | } |
849 | |
850 | return 0; |
851 | } |
852 | |
853 | static void fw_device_update(struct work_struct *work) |
854 | { |
855 | struct fw_device *device = |
856 | container_of(work, struct fw_device, work.work); |
857 | |
858 | fw_device_cdev_update(device); |
859 | device_for_each_child(&device->device, NULL, update_unit); |
860 | } |
861 | |
862 | /* |
863 | * If a device was pending for deletion because its node went away but its |
864 | * bus info block and root directory header matches that of a newly discovered |
865 | * device, revive the existing fw_device. |
866 | * The newly allocated fw_device becomes obsolete instead. |
867 | */ |
868 | static int lookup_existing_device(struct device *dev, void *data) |
869 | { |
870 | struct fw_device *old = fw_device(dev); |
871 | struct fw_device *new = data; |
872 | struct fw_card *card = new->card; |
873 | int match = 0; |
874 | |
875 | if (!is_fw_device(dev)) |
876 | return 0; |
877 | |
878 | down_read(&fw_device_rwsem); /* serialize config_rom access */ |
879 | spin_lock_irq(&card->lock); /* serialize node access */ |
880 | |
881 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && |
882 | atomic_cmpxchg(&old->state, |
883 | FW_DEVICE_GONE, |
884 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { |
885 | struct fw_node *current_node = new->node; |
886 | struct fw_node *obsolete_node = old->node; |
887 | |
888 | new->node = obsolete_node; |
889 | new->node->data = new; |
890 | old->node = current_node; |
891 | old->node->data = old; |
892 | |
893 | old->max_speed = new->max_speed; |
894 | old->node_id = current_node->node_id; |
895 | smp_wmb(); /* update node_id before generation */ |
896 | old->generation = card->generation; |
897 | old->config_rom_retries = 0; |
898 | fw_notice(card, "rediscovered device %s\n", dev_name(dev)); |
899 | |
900 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
901 | fw_schedule_device_work(old, 0); |
902 | |
903 | if (current_node == card->root_node) |
904 | fw_schedule_bm_work(card, 0); |
905 | |
906 | match = 1; |
907 | } |
908 | |
909 | spin_unlock_irq(&card->lock); |
910 | up_read(&fw_device_rwsem); |
911 | |
912 | return match; |
913 | } |
914 | |
915 | enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; |
916 | |
917 | static void set_broadcast_channel(struct fw_device *device, int generation) |
918 | { |
919 | struct fw_card *card = device->card; |
920 | __be32 data; |
921 | int rcode; |
922 | |
923 | if (!card->broadcast_channel_allocated) |
924 | return; |
925 | |
926 | /* |
927 | * The Broadcast_Channel Valid bit is required by nodes which want to |
928 | * transmit on this channel. Such transmissions are practically |
929 | * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required |
930 | * to be IRM capable and have a max_rec of 8 or more. We use this fact |
931 | * to narrow down to which nodes we send Broadcast_Channel updates. |
932 | */ |
933 | if (!device->irmc || device->max_rec < 8) |
934 | return; |
935 | |
936 | /* |
937 | * Some 1394-1995 nodes crash if this 1394a-2000 register is written. |
938 | * Perform a read test first. |
939 | */ |
940 | if (device->bc_implemented == BC_UNKNOWN) { |
941 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, |
942 | device->node_id, generation, device->max_speed, |
943 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, |
944 | &data, 4); |
945 | switch (rcode) { |
946 | case RCODE_COMPLETE: |
947 | if (data & cpu_to_be32(1 << 31)) { |
948 | device->bc_implemented = BC_IMPLEMENTED; |
949 | break; |
950 | } |
951 | /* else fall through to case address error */ |
952 | case RCODE_ADDRESS_ERROR: |
953 | device->bc_implemented = BC_UNIMPLEMENTED; |
954 | } |
955 | } |
956 | |
957 | if (device->bc_implemented == BC_IMPLEMENTED) { |
958 | data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | |
959 | BROADCAST_CHANNEL_VALID); |
960 | fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, |
961 | device->node_id, generation, device->max_speed, |
962 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, |
963 | &data, 4); |
964 | } |
965 | } |
966 | |
967 | int fw_device_set_broadcast_channel(struct device *dev, void *gen) |
968 | { |
969 | if (is_fw_device(dev)) |
970 | set_broadcast_channel(fw_device(dev), (long)gen); |
971 | |
972 | return 0; |
973 | } |
974 | |
975 | static void fw_device_init(struct work_struct *work) |
976 | { |
977 | struct fw_device *device = |
978 | container_of(work, struct fw_device, work.work); |
979 | struct fw_card *card = device->card; |
980 | struct device *revived_dev; |
981 | int minor, ret; |
982 | |
983 | /* |
984 | * All failure paths here set node->data to NULL, so that we |
985 | * don't try to do device_for_each_child() on a kfree()'d |
986 | * device. |
987 | */ |
988 | |
989 | ret = read_config_rom(device, device->generation); |
990 | if (ret != RCODE_COMPLETE) { |
991 | if (device->config_rom_retries < MAX_RETRIES && |
992 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { |
993 | device->config_rom_retries++; |
994 | fw_schedule_device_work(device, RETRY_DELAY); |
995 | } else { |
996 | if (device->node->link_on) |
997 | fw_notice(card, "giving up on node %x: reading config rom failed: %s\n", |
998 | device->node_id, |
999 | fw_rcode_string(ret)); |
1000 | if (device->node == card->root_node) |
1001 | fw_schedule_bm_work(card, 0); |
1002 | fw_device_release(&device->device); |
1003 | } |
1004 | return; |
1005 | } |
1006 | |
1007 | revived_dev = device_find_child(card->device, |
1008 | device, lookup_existing_device); |
1009 | if (revived_dev) { |
1010 | put_device(revived_dev); |
1011 | fw_device_release(&device->device); |
1012 | |
1013 | return; |
1014 | } |
1015 | |
1016 | device_initialize(&device->device); |
1017 | |
1018 | fw_device_get(device); |
1019 | down_write(&fw_device_rwsem); |
1020 | minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS, |
1021 | GFP_KERNEL); |
1022 | up_write(&fw_device_rwsem); |
1023 | |
1024 | if (minor < 0) |
1025 | goto error; |
1026 | |
1027 | device->device.bus = &fw_bus_type; |
1028 | device->device.type = &fw_device_type; |
1029 | device->device.parent = card->device; |
1030 | device->device.devt = MKDEV(fw_cdev_major, minor); |
1031 | dev_set_name(&device->device, "fw%d", minor); |
1032 | |
1033 | BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) < |
1034 | ARRAY_SIZE(fw_device_attributes) + |
1035 | ARRAY_SIZE(config_rom_attributes)); |
1036 | init_fw_attribute_group(&device->device, |
1037 | fw_device_attributes, |
1038 | &device->attribute_group); |
1039 | |
1040 | if (device_add(&device->device)) { |
1041 | fw_err(card, "failed to add device\n"); |
1042 | goto error_with_cdev; |
1043 | } |
1044 | |
1045 | create_units(device); |
1046 | |
1047 | /* |
1048 | * Transition the device to running state. If it got pulled |
1049 | * out from under us while we did the intialization work, we |
1050 | * have to shut down the device again here. Normally, though, |
1051 | * fw_node_event will be responsible for shutting it down when |
1052 | * necessary. We have to use the atomic cmpxchg here to avoid |
1053 | * racing with the FW_NODE_DESTROYED case in |
1054 | * fw_node_event(). |
1055 | */ |
1056 | if (atomic_cmpxchg(&device->state, |
1057 | FW_DEVICE_INITIALIZING, |
1058 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { |
1059 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
1060 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
1061 | } else { |
1062 | fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n", |
1063 | dev_name(&device->device), |
1064 | device->config_rom[3], device->config_rom[4], |
1065 | 1 << device->max_speed); |
1066 | device->config_rom_retries = 0; |
1067 | |
1068 | set_broadcast_channel(device, device->generation); |
1069 | |
1070 | add_device_randomness(&device->config_rom[3], 8); |
1071 | } |
1072 | |
1073 | /* |
1074 | * Reschedule the IRM work if we just finished reading the |
1075 | * root node config rom. If this races with a bus reset we |
1076 | * just end up running the IRM work a couple of extra times - |
1077 | * pretty harmless. |
1078 | */ |
1079 | if (device->node == card->root_node) |
1080 | fw_schedule_bm_work(card, 0); |
1081 | |
1082 | return; |
1083 | |
1084 | error_with_cdev: |
1085 | down_write(&fw_device_rwsem); |
1086 | idr_remove(&fw_device_idr, minor); |
1087 | up_write(&fw_device_rwsem); |
1088 | error: |
1089 | fw_device_put(device); /* fw_device_idr's reference */ |
1090 | |
1091 | put_device(&device->device); /* our reference */ |
1092 | } |
1093 | |
1094 | /* Reread and compare bus info block and header of root directory */ |
1095 | static int reread_config_rom(struct fw_device *device, int generation, |
1096 | bool *changed) |
1097 | { |
1098 | u32 q; |
1099 | int i, rcode; |
1100 | |
1101 | for (i = 0; i < 6; i++) { |
1102 | rcode = read_rom(device, generation, i, &q); |
1103 | if (rcode != RCODE_COMPLETE) |
1104 | return rcode; |
1105 | |
1106 | if (i == 0 && q == 0) |
1107 | /* inaccessible (see read_config_rom); retry later */ |
1108 | return RCODE_BUSY; |
1109 | |
1110 | if (q != device->config_rom[i]) { |
1111 | *changed = true; |
1112 | return RCODE_COMPLETE; |
1113 | } |
1114 | } |
1115 | |
1116 | *changed = false; |
1117 | return RCODE_COMPLETE; |
1118 | } |
1119 | |
1120 | static void fw_device_refresh(struct work_struct *work) |
1121 | { |
1122 | struct fw_device *device = |
1123 | container_of(work, struct fw_device, work.work); |
1124 | struct fw_card *card = device->card; |
1125 | int ret, node_id = device->node_id; |
1126 | bool changed; |
1127 | |
1128 | ret = reread_config_rom(device, device->generation, &changed); |
1129 | if (ret != RCODE_COMPLETE) |
1130 | goto failed_config_rom; |
1131 | |
1132 | if (!changed) { |
1133 | if (atomic_cmpxchg(&device->state, |
1134 | FW_DEVICE_INITIALIZING, |
1135 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) |
1136 | goto gone; |
1137 | |
1138 | fw_device_update(work); |
1139 | device->config_rom_retries = 0; |
1140 | goto out; |
1141 | } |
1142 | |
1143 | /* |
1144 | * Something changed. We keep things simple and don't investigate |
1145 | * further. We just destroy all previous units and create new ones. |
1146 | */ |
1147 | device_for_each_child(&device->device, NULL, shutdown_unit); |
1148 | |
1149 | ret = read_config_rom(device, device->generation); |
1150 | if (ret != RCODE_COMPLETE) |
1151 | goto failed_config_rom; |
1152 | |
1153 | fw_device_cdev_update(device); |
1154 | create_units(device); |
1155 | |
1156 | /* Userspace may want to re-read attributes. */ |
1157 | kobject_uevent(&device->device.kobj, KOBJ_CHANGE); |
1158 | |
1159 | if (atomic_cmpxchg(&device->state, |
1160 | FW_DEVICE_INITIALIZING, |
1161 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) |
1162 | goto gone; |
1163 | |
1164 | fw_notice(card, "refreshed device %s\n", dev_name(&device->device)); |
1165 | device->config_rom_retries = 0; |
1166 | goto out; |
1167 | |
1168 | failed_config_rom: |
1169 | if (device->config_rom_retries < MAX_RETRIES && |
1170 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { |
1171 | device->config_rom_retries++; |
1172 | fw_schedule_device_work(device, RETRY_DELAY); |
1173 | return; |
1174 | } |
1175 | |
1176 | fw_notice(card, "giving up on refresh of device %s: %s\n", |
1177 | dev_name(&device->device), fw_rcode_string(ret)); |
1178 | gone: |
1179 | atomic_set(&device->state, FW_DEVICE_GONE); |
1180 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
1181 | fw_schedule_device_work(device, SHUTDOWN_DELAY); |
1182 | out: |
1183 | if (node_id == card->root_node->node_id) |
1184 | fw_schedule_bm_work(card, 0); |
1185 | } |
1186 | |
1187 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
1188 | { |
1189 | struct fw_device *device; |
1190 | |
1191 | switch (event) { |
1192 | case FW_NODE_CREATED: |
1193 | /* |
1194 | * Attempt to scan the node, regardless whether its self ID has |
1195 | * the L (link active) flag set or not. Some broken devices |
1196 | * send L=0 but have an up-and-running link; others send L=1 |
1197 | * without actually having a link. |
1198 | */ |
1199 | create: |
1200 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
1201 | if (device == NULL) |
1202 | break; |
1203 | |
1204 | /* |
1205 | * Do minimal intialization of the device here, the |
1206 | * rest will happen in fw_device_init(). |
1207 | * |
1208 | * Attention: A lot of things, even fw_device_get(), |
1209 | * cannot be done before fw_device_init() finished! |
1210 | * You can basically just check device->state and |
1211 | * schedule work until then, but only while holding |
1212 | * card->lock. |
1213 | */ |
1214 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
1215 | device->card = fw_card_get(card); |
1216 | device->node = fw_node_get(node); |
1217 | device->node_id = node->node_id; |
1218 | device->generation = card->generation; |
1219 | device->is_local = node == card->local_node; |
1220 | mutex_init(&device->client_list_mutex); |
1221 | INIT_LIST_HEAD(&device->client_list); |
1222 | |
1223 | /* |
1224 | * Set the node data to point back to this device so |
1225 | * FW_NODE_UPDATED callbacks can update the node_id |
1226 | * and generation for the device. |
1227 | */ |
1228 | node->data = device; |
1229 | |
1230 | /* |
1231 | * Many devices are slow to respond after bus resets, |
1232 | * especially if they are bus powered and go through |
1233 | * power-up after getting plugged in. We schedule the |
1234 | * first config rom scan half a second after bus reset. |
1235 | */ |
1236 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1237 | fw_schedule_device_work(device, INITIAL_DELAY); |
1238 | break; |
1239 | |
1240 | case FW_NODE_INITIATED_RESET: |
1241 | case FW_NODE_LINK_ON: |
1242 | device = node->data; |
1243 | if (device == NULL) |
1244 | goto create; |
1245 | |
1246 | device->node_id = node->node_id; |
1247 | smp_wmb(); /* update node_id before generation */ |
1248 | device->generation = card->generation; |
1249 | if (atomic_cmpxchg(&device->state, |
1250 | FW_DEVICE_RUNNING, |
1251 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { |
1252 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); |
1253 | fw_schedule_device_work(device, |
1254 | device->is_local ? 0 : INITIAL_DELAY); |
1255 | } |
1256 | break; |
1257 | |
1258 | case FW_NODE_UPDATED: |
1259 | device = node->data; |
1260 | if (device == NULL) |
1261 | break; |
1262 | |
1263 | device->node_id = node->node_id; |
1264 | smp_wmb(); /* update node_id before generation */ |
1265 | device->generation = card->generation; |
1266 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1267 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); |
1268 | fw_schedule_device_work(device, 0); |
1269 | } |
1270 | break; |
1271 | |
1272 | case FW_NODE_DESTROYED: |
1273 | case FW_NODE_LINK_OFF: |
1274 | if (!node->data) |
1275 | break; |
1276 | |
1277 | /* |
1278 | * Destroy the device associated with the node. There |
1279 | * are two cases here: either the device is fully |
1280 | * initialized (FW_DEVICE_RUNNING) or we're in the |
1281 | * process of reading its config rom |
1282 | * (FW_DEVICE_INITIALIZING). If it is fully |
1283 | * initialized we can reuse device->work to schedule a |
1284 | * full fw_device_shutdown(). If not, there's work |
1285 | * scheduled to read it's config rom, and we just put |
1286 | * the device in shutdown state to have that code fail |
1287 | * to create the device. |
1288 | */ |
1289 | device = node->data; |
1290 | if (atomic_xchg(&device->state, |
1291 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
1292 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
1293 | fw_schedule_device_work(device, |
1294 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); |
1295 | } |
1296 | break; |
1297 | } |
1298 | } |
1299 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9