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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 | ||
41f321c2 | 21 | #include <linux/ctype.h> |
19a15b93 | 22 | #include <linux/delay.h> |
41f321c2 SR |
23 | #include <linux/device.h> |
24 | #include <linux/errno.h> | |
a3aca3da | 25 | #include <linux/idr.h> |
3d36a0df | 26 | #include <linux/jiffies.h> |
41f321c2 SR |
27 | #include <linux/kobject.h> |
28 | #include <linux/list.h> | |
d67cfb96 | 29 | #include <linux/mutex.h> |
6188e10d MW |
30 | #include <linux/rwsem.h> |
31 | #include <linux/semaphore.h> | |
cf417e54 | 32 | #include <linux/spinlock.h> |
41f321c2 SR |
33 | #include <linux/string.h> |
34 | #include <linux/workqueue.h> | |
35 | ||
b5d2a5e0 | 36 | #include <asm/system.h> |
41f321c2 | 37 | |
19a15b93 | 38 | #include "fw-device.h" |
41f321c2 SR |
39 | #include "fw-topology.h" |
40 | #include "fw-transaction.h" | |
19a15b93 KH |
41 | |
42 | void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) | |
43 | { | |
44 | ci->p = p + 1; | |
45 | ci->end = ci->p + (p[0] >> 16); | |
46 | } | |
19a15b93 KH |
47 | EXPORT_SYMBOL(fw_csr_iterator_init); |
48 | ||
49 | int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) | |
50 | { | |
51 | *key = *ci->p >> 24; | |
52 | *value = *ci->p & 0xffffff; | |
53 | ||
54 | return ci->p++ < ci->end; | |
55 | } | |
19a15b93 KH |
56 | EXPORT_SYMBOL(fw_csr_iterator_next); |
57 | ||
58 | static int is_fw_unit(struct device *dev); | |
59 | ||
21ebcd12 | 60 | static int match_unit_directory(u32 * directory, const struct fw_device_id *id) |
19a15b93 KH |
61 | { |
62 | struct fw_csr_iterator ci; | |
63 | int key, value, match; | |
64 | ||
65 | match = 0; | |
66 | fw_csr_iterator_init(&ci, directory); | |
67 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
68 | if (key == CSR_VENDOR && value == id->vendor) | |
69 | match |= FW_MATCH_VENDOR; | |
70 | if (key == CSR_MODEL && value == id->model) | |
71 | match |= FW_MATCH_MODEL; | |
72 | if (key == CSR_SPECIFIER_ID && value == id->specifier_id) | |
73 | match |= FW_MATCH_SPECIFIER_ID; | |
74 | if (key == CSR_VERSION && value == id->version) | |
75 | match |= FW_MATCH_VERSION; | |
76 | } | |
77 | ||
78 | return (match & id->match_flags) == id->match_flags; | |
79 | } | |
80 | ||
81 | static int fw_unit_match(struct device *dev, struct device_driver *drv) | |
82 | { | |
83 | struct fw_unit *unit = fw_unit(dev); | |
84 | struct fw_driver *driver = fw_driver(drv); | |
85 | int i; | |
86 | ||
87 | /* We only allow binding to fw_units. */ | |
88 | if (!is_fw_unit(dev)) | |
89 | return 0; | |
90 | ||
91 | for (i = 0; driver->id_table[i].match_flags != 0; i++) { | |
92 | if (match_unit_directory(unit->directory, &driver->id_table[i])) | |
93 | return 1; | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) | |
100 | { | |
101 | struct fw_device *device = fw_device(unit->device.parent); | |
102 | struct fw_csr_iterator ci; | |
103 | ||
104 | int key, value; | |
105 | int vendor = 0; | |
106 | int model = 0; | |
107 | int specifier_id = 0; | |
108 | int version = 0; | |
109 | ||
110 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
111 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
112 | switch (key) { | |
113 | case CSR_VENDOR: | |
114 | vendor = value; | |
115 | break; | |
116 | case CSR_MODEL: | |
117 | model = value; | |
118 | break; | |
119 | } | |
120 | } | |
121 | ||
122 | fw_csr_iterator_init(&ci, unit->directory); | |
123 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
124 | switch (key) { | |
125 | case CSR_SPECIFIER_ID: | |
126 | specifier_id = value; | |
127 | break; | |
128 | case CSR_VERSION: | |
129 | version = value; | |
130 | break; | |
131 | } | |
132 | } | |
133 | ||
134 | return snprintf(buffer, buffer_size, | |
135 | "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", | |
136 | vendor, model, specifier_id, version); | |
137 | } | |
138 | ||
53dca511 | 139 | static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) |
19a15b93 KH |
140 | { |
141 | struct fw_unit *unit = fw_unit(dev); | |
142 | char modalias[64]; | |
19a15b93 | 143 | |
2d826cc5 | 144 | get_modalias(unit, modalias, sizeof(modalias)); |
19a15b93 | 145 | |
7eff2e7a | 146 | if (add_uevent_var(env, "MODALIAS=%s", modalias)) |
19a15b93 KH |
147 | return -ENOMEM; |
148 | ||
19a15b93 KH |
149 | return 0; |
150 | } | |
151 | ||
152 | struct bus_type fw_bus_type = { | |
362c2c8c | 153 | .name = "firewire", |
19a15b93 | 154 | .match = fw_unit_match, |
19a15b93 | 155 | }; |
19a15b93 KH |
156 | EXPORT_SYMBOL(fw_bus_type); |
157 | ||
19a15b93 KH |
158 | int fw_device_enable_phys_dma(struct fw_device *device) |
159 | { | |
b5d2a5e0 SR |
160 | int generation = device->generation; |
161 | ||
162 | /* device->node_id, accessed below, must not be older than generation */ | |
163 | smp_rmb(); | |
164 | ||
19a15b93 KH |
165 | return device->card->driver->enable_phys_dma(device->card, |
166 | device->node_id, | |
b5d2a5e0 | 167 | generation); |
19a15b93 | 168 | } |
19a15b93 KH |
169 | EXPORT_SYMBOL(fw_device_enable_phys_dma); |
170 | ||
7feb9cce KH |
171 | struct config_rom_attribute { |
172 | struct device_attribute attr; | |
173 | u32 key; | |
174 | }; | |
175 | ||
53dca511 SR |
176 | static ssize_t show_immediate(struct device *dev, |
177 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
178 | { |
179 | struct config_rom_attribute *attr = | |
180 | container_of(dattr, struct config_rom_attribute, attr); | |
181 | struct fw_csr_iterator ci; | |
182 | u32 *dir; | |
c9755e14 SR |
183 | int key, value, ret = -ENOENT; |
184 | ||
185 | down_read(&fw_device_rwsem); | |
7feb9cce KH |
186 | |
187 | if (is_fw_unit(dev)) | |
188 | dir = fw_unit(dev)->directory; | |
189 | else | |
190 | dir = fw_device(dev)->config_rom + 5; | |
191 | ||
192 | fw_csr_iterator_init(&ci, dir); | |
193 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
c9755e14 SR |
194 | if (attr->key == key) { |
195 | ret = snprintf(buf, buf ? PAGE_SIZE : 0, | |
196 | "0x%06x\n", value); | |
197 | break; | |
198 | } | |
199 | ||
200 | up_read(&fw_device_rwsem); | |
7feb9cce | 201 | |
c9755e14 | 202 | return ret; |
7feb9cce KH |
203 | } |
204 | ||
205 | #define IMMEDIATE_ATTR(name, key) \ | |
206 | { __ATTR(name, S_IRUGO, show_immediate, NULL), key } | |
207 | ||
53dca511 SR |
208 | static ssize_t show_text_leaf(struct device *dev, |
209 | struct device_attribute *dattr, char *buf) | |
7feb9cce KH |
210 | { |
211 | struct config_rom_attribute *attr = | |
212 | container_of(dattr, struct config_rom_attribute, attr); | |
213 | struct fw_csr_iterator ci; | |
214 | u32 *dir, *block = NULL, *p, *end; | |
c9755e14 | 215 | int length, key, value, last_key = 0, ret = -ENOENT; |
7feb9cce KH |
216 | char *b; |
217 | ||
c9755e14 SR |
218 | down_read(&fw_device_rwsem); |
219 | ||
7feb9cce KH |
220 | if (is_fw_unit(dev)) |
221 | dir = fw_unit(dev)->directory; | |
222 | else | |
223 | dir = fw_device(dev)->config_rom + 5; | |
224 | ||
225 | fw_csr_iterator_init(&ci, dir); | |
226 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
227 | if (attr->key == last_key && | |
228 | key == (CSR_DESCRIPTOR | CSR_LEAF)) | |
229 | block = ci.p - 1 + value; | |
230 | last_key = key; | |
231 | } | |
232 | ||
233 | if (block == NULL) | |
c9755e14 | 234 | goto out; |
7feb9cce KH |
235 | |
236 | length = min(block[0] >> 16, 256U); | |
237 | if (length < 3) | |
c9755e14 | 238 | goto out; |
7feb9cce KH |
239 | |
240 | if (block[1] != 0 || block[2] != 0) | |
241 | /* Unknown encoding. */ | |
c9755e14 | 242 | goto out; |
7feb9cce | 243 | |
c9755e14 SR |
244 | if (buf == NULL) { |
245 | ret = length * 4; | |
246 | goto out; | |
247 | } | |
7feb9cce KH |
248 | |
249 | b = buf; | |
250 | end = &block[length + 1]; | |
251 | for (p = &block[3]; p < end; p++, b += 4) | |
252 | * (u32 *) b = (__force u32) __cpu_to_be32(*p); | |
253 | ||
254 | /* Strip trailing whitespace and add newline. */ | |
255 | while (b--, (isspace(*b) || *b == '\0') && b > buf); | |
256 | strcpy(b + 1, "\n"); | |
c9755e14 SR |
257 | ret = b + 2 - buf; |
258 | out: | |
259 | up_read(&fw_device_rwsem); | |
7feb9cce | 260 | |
c9755e14 | 261 | return ret; |
7feb9cce KH |
262 | } |
263 | ||
264 | #define TEXT_LEAF_ATTR(name, key) \ | |
265 | { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } | |
266 | ||
267 | static struct config_rom_attribute config_rom_attributes[] = { | |
268 | IMMEDIATE_ATTR(vendor, CSR_VENDOR), | |
269 | IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), | |
270 | IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), | |
271 | IMMEDIATE_ATTR(version, CSR_VERSION), | |
272 | IMMEDIATE_ATTR(model, CSR_MODEL), | |
273 | TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), | |
274 | TEXT_LEAF_ATTR(model_name, CSR_MODEL), | |
275 | TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), | |
276 | }; | |
277 | ||
53dca511 SR |
278 | static void init_fw_attribute_group(struct device *dev, |
279 | struct device_attribute *attrs, | |
280 | struct fw_attribute_group *group) | |
7feb9cce KH |
281 | { |
282 | struct device_attribute *attr; | |
6f2e53d5 KH |
283 | int i, j; |
284 | ||
285 | for (j = 0; attrs[j].attr.name != NULL; j++) | |
286 | group->attrs[j] = &attrs[j].attr; | |
7feb9cce KH |
287 | |
288 | for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { | |
289 | attr = &config_rom_attributes[i].attr; | |
290 | if (attr->show(dev, attr, NULL) < 0) | |
291 | continue; | |
6f2e53d5 | 292 | group->attrs[j++] = &attr->attr; |
7feb9cce KH |
293 | } |
294 | ||
6f2e53d5 KH |
295 | BUG_ON(j >= ARRAY_SIZE(group->attrs)); |
296 | group->attrs[j++] = NULL; | |
297 | group->groups[0] = &group->group; | |
298 | group->groups[1] = NULL; | |
299 | group->group.attrs = group->attrs; | |
300 | dev->groups = group->groups; | |
7feb9cce KH |
301 | } |
302 | ||
53dca511 SR |
303 | static ssize_t modalias_show(struct device *dev, |
304 | struct device_attribute *attr, char *buf) | |
19a15b93 KH |
305 | { |
306 | struct fw_unit *unit = fw_unit(dev); | |
307 | int length; | |
308 | ||
309 | length = get_modalias(unit, buf, PAGE_SIZE); | |
310 | strcpy(buf + length, "\n"); | |
311 | ||
312 | return length + 1; | |
313 | } | |
314 | ||
53dca511 SR |
315 | static ssize_t rom_index_show(struct device *dev, |
316 | struct device_attribute *attr, char *buf) | |
19a15b93 | 317 | { |
21351dbe KH |
318 | struct fw_device *device = fw_device(dev->parent); |
319 | struct fw_unit *unit = fw_unit(dev); | |
19a15b93 | 320 | |
21351dbe KH |
321 | return snprintf(buf, PAGE_SIZE, "%d\n", |
322 | (int)(unit->directory - device->config_rom)); | |
19a15b93 KH |
323 | } |
324 | ||
21351dbe KH |
325 | static struct device_attribute fw_unit_attributes[] = { |
326 | __ATTR_RO(modalias), | |
327 | __ATTR_RO(rom_index), | |
328 | __ATTR_NULL, | |
19a15b93 KH |
329 | }; |
330 | ||
53dca511 SR |
331 | static ssize_t config_rom_show(struct device *dev, |
332 | struct device_attribute *attr, char *buf) | |
048961ef | 333 | { |
21351dbe | 334 | struct fw_device *device = fw_device(dev); |
c9755e14 | 335 | size_t length; |
048961ef | 336 | |
c9755e14 SR |
337 | down_read(&fw_device_rwsem); |
338 | length = device->config_rom_length * 4; | |
339 | memcpy(buf, device->config_rom, length); | |
340 | up_read(&fw_device_rwsem); | |
21351dbe | 341 | |
c9755e14 | 342 | return length; |
048961ef KH |
343 | } |
344 | ||
53dca511 SR |
345 | static ssize_t guid_show(struct device *dev, |
346 | struct device_attribute *attr, char *buf) | |
bbd14945 KH |
347 | { |
348 | struct fw_device *device = fw_device(dev); | |
c9755e14 SR |
349 | int ret; |
350 | ||
351 | down_read(&fw_device_rwsem); | |
352 | ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", | |
353 | device->config_rom[3], device->config_rom[4]); | |
354 | up_read(&fw_device_rwsem); | |
bbd14945 | 355 | |
c9755e14 | 356 | return ret; |
bbd14945 KH |
357 | } |
358 | ||
21351dbe KH |
359 | static struct device_attribute fw_device_attributes[] = { |
360 | __ATTR_RO(config_rom), | |
bbd14945 | 361 | __ATTR_RO(guid), |
21351dbe | 362 | __ATTR_NULL, |
048961ef KH |
363 | }; |
364 | ||
53dca511 SR |
365 | static int read_rom(struct fw_device *device, |
366 | int generation, int index, u32 *data) | |
19a15b93 | 367 | { |
1e119fa9 | 368 | int rcode; |
b5d2a5e0 SR |
369 | |
370 | /* device->node_id, accessed below, must not be older than generation */ | |
371 | smp_rmb(); | |
19a15b93 | 372 | |
1e119fa9 | 373 | rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, |
b5d2a5e0 | 374 | device->node_id, generation, device->max_speed, |
1e119fa9 JF |
375 | (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, |
376 | data, 4); | |
377 | be32_to_cpus(data); | |
19a15b93 | 378 | |
1e119fa9 | 379 | return rcode; |
19a15b93 KH |
380 | } |
381 | ||
1dadff71 SR |
382 | #define READ_BIB_ROM_SIZE 256 |
383 | #define READ_BIB_STACK_SIZE 16 | |
384 | ||
f8d2dc39 SR |
385 | /* |
386 | * Read the bus info block, perform a speed probe, and read all of the rest of | |
387 | * the config ROM. We do all this with a cached bus generation. If the bus | |
388 | * generation changes under us, read_bus_info_block will fail and get retried. | |
389 | * It's better to start all over in this case because the node from which we | |
390 | * are reading the ROM may have changed the ROM during the reset. | |
391 | */ | |
392 | static int read_bus_info_block(struct fw_device *device, int generation) | |
19a15b93 | 393 | { |
c9755e14 | 394 | u32 *rom, *stack, *old_rom, *new_rom; |
1dadff71 SR |
395 | u32 sp, key; |
396 | int i, end, length, ret = -1; | |
397 | ||
398 | rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + | |
399 | sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); | |
400 | if (rom == NULL) | |
401 | return -ENOMEM; | |
402 | ||
403 | stack = &rom[READ_BIB_ROM_SIZE]; | |
19a15b93 | 404 | |
f1397490 SR |
405 | device->max_speed = SCODE_100; |
406 | ||
19a15b93 KH |
407 | /* First read the bus info block. */ |
408 | for (i = 0; i < 5; i++) { | |
f8d2dc39 | 409 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 410 | goto out; |
c781c06d KH |
411 | /* |
412 | * As per IEEE1212 7.2, during power-up, devices can | |
19a15b93 KH |
413 | * reply with a 0 for the first quadlet of the config |
414 | * rom to indicate that they are booting (for example, | |
415 | * if the firmware is on the disk of a external | |
416 | * harddisk). In that case we just fail, and the | |
c781c06d KH |
417 | * retry mechanism will try again later. |
418 | */ | |
19a15b93 | 419 | if (i == 0 && rom[i] == 0) |
1dadff71 | 420 | goto out; |
19a15b93 KH |
421 | } |
422 | ||
f1397490 SR |
423 | device->max_speed = device->node->max_speed; |
424 | ||
425 | /* | |
426 | * Determine the speed of | |
427 | * - devices with link speed less than PHY speed, | |
428 | * - devices with 1394b PHY (unless only connected to 1394a PHYs), | |
429 | * - all devices if there are 1394b repeaters. | |
430 | * Note, we cannot use the bus info block's link_spd as starting point | |
431 | * because some buggy firmwares set it lower than necessary and because | |
432 | * 1394-1995 nodes do not have the field. | |
433 | */ | |
434 | if ((rom[2] & 0x7) < device->max_speed || | |
435 | device->max_speed == SCODE_BETA || | |
436 | device->card->beta_repeaters_present) { | |
437 | u32 dummy; | |
438 | ||
439 | /* for S1600 and S3200 */ | |
440 | if (device->max_speed == SCODE_BETA) | |
441 | device->max_speed = device->card->link_speed; | |
442 | ||
443 | while (device->max_speed > SCODE_100) { | |
f8d2dc39 SR |
444 | if (read_rom(device, generation, 0, &dummy) == |
445 | RCODE_COMPLETE) | |
f1397490 SR |
446 | break; |
447 | device->max_speed--; | |
448 | } | |
449 | } | |
450 | ||
c781c06d KH |
451 | /* |
452 | * Now parse the config rom. The config rom is a recursive | |
19a15b93 KH |
453 | * directory structure so we parse it using a stack of |
454 | * references to the blocks that make up the structure. We | |
455 | * push a reference to the root directory on the stack to | |
c781c06d KH |
456 | * start things off. |
457 | */ | |
19a15b93 KH |
458 | length = i; |
459 | sp = 0; | |
460 | stack[sp++] = 0xc0000005; | |
461 | while (sp > 0) { | |
c781c06d KH |
462 | /* |
463 | * Pop the next block reference of the stack. The | |
19a15b93 KH |
464 | * lower 24 bits is the offset into the config rom, |
465 | * the upper 8 bits are the type of the reference the | |
c781c06d KH |
466 | * block. |
467 | */ | |
19a15b93 KH |
468 | key = stack[--sp]; |
469 | i = key & 0xffffff; | |
1dadff71 | 470 | if (i >= READ_BIB_ROM_SIZE) |
c781c06d KH |
471 | /* |
472 | * The reference points outside the standard | |
473 | * config rom area, something's fishy. | |
474 | */ | |
1dadff71 | 475 | goto out; |
19a15b93 KH |
476 | |
477 | /* Read header quadlet for the block to get the length. */ | |
f8d2dc39 | 478 | if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) |
1dadff71 | 479 | goto out; |
19a15b93 KH |
480 | end = i + (rom[i] >> 16) + 1; |
481 | i++; | |
1dadff71 | 482 | if (end > READ_BIB_ROM_SIZE) |
c781c06d KH |
483 | /* |
484 | * This block extends outside standard config | |
19a15b93 KH |
485 | * area (and the array we're reading it |
486 | * into). That's broken, so ignore this | |
c781c06d KH |
487 | * device. |
488 | */ | |
1dadff71 | 489 | goto out; |
19a15b93 | 490 | |
c781c06d KH |
491 | /* |
492 | * Now read in the block. If this is a directory | |
19a15b93 | 493 | * block, check the entries as we read them to see if |
c781c06d KH |
494 | * it references another block, and push it in that case. |
495 | */ | |
19a15b93 | 496 | while (i < end) { |
f8d2dc39 SR |
497 | if (read_rom(device, generation, i, &rom[i]) != |
498 | RCODE_COMPLETE) | |
1dadff71 | 499 | goto out; |
19a15b93 | 500 | if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && |
1dadff71 | 501 | sp < READ_BIB_STACK_SIZE) |
19a15b93 KH |
502 | stack[sp++] = i + rom[i]; |
503 | i++; | |
504 | } | |
505 | if (length < i) | |
506 | length = i; | |
507 | } | |
508 | ||
c9755e14 SR |
509 | old_rom = device->config_rom; |
510 | new_rom = kmemdup(rom, length * 4, GFP_KERNEL); | |
511 | if (new_rom == NULL) | |
1dadff71 | 512 | goto out; |
c9755e14 SR |
513 | |
514 | down_write(&fw_device_rwsem); | |
515 | device->config_rom = new_rom; | |
19a15b93 | 516 | device->config_rom_length = length; |
c9755e14 SR |
517 | up_write(&fw_device_rwsem); |
518 | ||
519 | kfree(old_rom); | |
1dadff71 | 520 | ret = 0; |
c9755e14 | 521 | device->cmc = rom[2] & 1 << 30; |
1dadff71 SR |
522 | out: |
523 | kfree(rom); | |
19a15b93 | 524 | |
1dadff71 | 525 | return ret; |
19a15b93 KH |
526 | } |
527 | ||
528 | static void fw_unit_release(struct device *dev) | |
529 | { | |
530 | struct fw_unit *unit = fw_unit(dev); | |
531 | ||
532 | kfree(unit); | |
533 | } | |
534 | ||
21351dbe | 535 | static struct device_type fw_unit_type = { |
21351dbe KH |
536 | .uevent = fw_unit_uevent, |
537 | .release = fw_unit_release, | |
538 | }; | |
539 | ||
19a15b93 KH |
540 | static int is_fw_unit(struct device *dev) |
541 | { | |
21351dbe | 542 | return dev->type == &fw_unit_type; |
19a15b93 KH |
543 | } |
544 | ||
545 | static void create_units(struct fw_device *device) | |
546 | { | |
547 | struct fw_csr_iterator ci; | |
548 | struct fw_unit *unit; | |
549 | int key, value, i; | |
550 | ||
551 | i = 0; | |
552 | fw_csr_iterator_init(&ci, &device->config_rom[5]); | |
553 | while (fw_csr_iterator_next(&ci, &key, &value)) { | |
554 | if (key != (CSR_UNIT | CSR_DIRECTORY)) | |
555 | continue; | |
556 | ||
c781c06d KH |
557 | /* |
558 | * Get the address of the unit directory and try to | |
559 | * match the drivers id_tables against it. | |
560 | */ | |
2d826cc5 | 561 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); |
19a15b93 KH |
562 | if (unit == NULL) { |
563 | fw_error("failed to allocate memory for unit\n"); | |
564 | continue; | |
565 | } | |
566 | ||
567 | unit->directory = ci.p + value - 1; | |
568 | unit->device.bus = &fw_bus_type; | |
21351dbe | 569 | unit->device.type = &fw_unit_type; |
19a15b93 | 570 | unit->device.parent = &device->device; |
a1f64819 | 571 | dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); |
19a15b93 | 572 | |
6f2e53d5 KH |
573 | init_fw_attribute_group(&unit->device, |
574 | fw_unit_attributes, | |
575 | &unit->attribute_group); | |
7feb9cce KH |
576 | if (device_register(&unit->device) < 0) |
577 | goto skip_unit; | |
578 | ||
7feb9cce KH |
579 | continue; |
580 | ||
7feb9cce KH |
581 | skip_unit: |
582 | kfree(unit); | |
19a15b93 KH |
583 | } |
584 | } | |
585 | ||
586 | static int shutdown_unit(struct device *device, void *data) | |
587 | { | |
21351dbe | 588 | device_unregister(device); |
19a15b93 KH |
589 | |
590 | return 0; | |
591 | } | |
592 | ||
c9755e14 SR |
593 | /* |
594 | * fw_device_rwsem acts as dual purpose mutex: | |
595 | * - serializes accesses to fw_device_idr, | |
596 | * - serializes accesses to fw_device.config_rom/.config_rom_length and | |
597 | * fw_unit.directory, unless those accesses happen at safe occasions | |
598 | */ | |
599 | DECLARE_RWSEM(fw_device_rwsem); | |
600 | ||
d6053e08 | 601 | DEFINE_IDR(fw_device_idr); |
a3aca3da KH |
602 | int fw_cdev_major; |
603 | ||
96b19062 | 604 | struct fw_device *fw_device_get_by_devt(dev_t devt) |
a3aca3da KH |
605 | { |
606 | struct fw_device *device; | |
607 | ||
c9755e14 | 608 | down_read(&fw_device_rwsem); |
a3aca3da | 609 | device = idr_find(&fw_device_idr, MINOR(devt)); |
96b19062 SR |
610 | if (device) |
611 | fw_device_get(device); | |
c9755e14 | 612 | up_read(&fw_device_rwsem); |
a3aca3da KH |
613 | |
614 | return device; | |
615 | } | |
616 | ||
3d36a0df SR |
617 | /* |
618 | * These defines control the retry behavior for reading the config | |
619 | * rom. It shouldn't be necessary to tweak these; if the device | |
620 | * doesn't respond to a config rom read within 10 seconds, it's not | |
621 | * going to respond at all. As for the initial delay, a lot of | |
622 | * devices will be able to respond within half a second after bus | |
623 | * reset. On the other hand, it's not really worth being more | |
624 | * aggressive than that, since it scales pretty well; if 10 devices | |
625 | * are plugged in, they're all getting read within one second. | |
626 | */ | |
627 | ||
628 | #define MAX_RETRIES 10 | |
629 | #define RETRY_DELAY (3 * HZ) | |
630 | #define INITIAL_DELAY (HZ / 2) | |
631 | #define SHUTDOWN_DELAY (2 * HZ) | |
632 | ||
19a15b93 KH |
633 | static void fw_device_shutdown(struct work_struct *work) |
634 | { | |
635 | struct fw_device *device = | |
636 | container_of(work, struct fw_device, work.work); | |
a3aca3da KH |
637 | int minor = MINOR(device->device.devt); |
638 | ||
e747a5c0 SR |
639 | if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) |
640 | && !list_empty(&device->card->link)) { | |
3d36a0df SR |
641 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); |
642 | return; | |
643 | } | |
644 | ||
645 | if (atomic_cmpxchg(&device->state, | |
646 | FW_DEVICE_GONE, | |
647 | FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) | |
648 | return; | |
649 | ||
2603bf21 | 650 | fw_device_cdev_remove(device); |
19a15b93 KH |
651 | device_for_each_child(&device->device, NULL, shutdown_unit); |
652 | device_unregister(&device->device); | |
96b19062 | 653 | |
c9755e14 | 654 | down_write(&fw_device_rwsem); |
96b19062 | 655 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 656 | up_write(&fw_device_rwsem); |
3d36a0df | 657 | |
96b19062 | 658 | fw_device_put(device); |
19a15b93 KH |
659 | } |
660 | ||
aed80892 SR |
661 | static void fw_device_release(struct device *dev) |
662 | { | |
663 | struct fw_device *device = fw_device(dev); | |
664 | struct fw_card *card = device->card; | |
665 | unsigned long flags; | |
666 | ||
667 | /* | |
668 | * Take the card lock so we don't set this to NULL while a | |
669 | * FW_NODE_UPDATED callback is being handled or while the | |
670 | * bus manager work looks at this node. | |
671 | */ | |
672 | spin_lock_irqsave(&card->lock, flags); | |
673 | device->node->data = NULL; | |
674 | spin_unlock_irqrestore(&card->lock, flags); | |
675 | ||
676 | fw_node_put(device->node); | |
677 | kfree(device->config_rom); | |
678 | kfree(device); | |
679 | fw_card_put(card); | |
680 | } | |
681 | ||
21351dbe | 682 | static struct device_type fw_device_type = { |
aed80892 | 683 | .release = fw_device_release, |
21351dbe KH |
684 | }; |
685 | ||
aed80892 SR |
686 | static int update_unit(struct device *dev, void *data) |
687 | { | |
688 | struct fw_unit *unit = fw_unit(dev); | |
689 | struct fw_driver *driver = (struct fw_driver *)dev->driver; | |
690 | ||
691 | if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { | |
692 | down(&dev->sem); | |
693 | driver->update(unit); | |
694 | up(&dev->sem); | |
695 | } | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | static void fw_device_update(struct work_struct *work) | |
701 | { | |
702 | struct fw_device *device = | |
703 | container_of(work, struct fw_device, work.work); | |
704 | ||
705 | fw_device_cdev_update(device); | |
706 | device_for_each_child(&device->device, NULL, update_unit); | |
707 | } | |
3d36a0df | 708 | |
c781c06d | 709 | /* |
3d36a0df SR |
710 | * If a device was pending for deletion because its node went away but its |
711 | * bus info block and root directory header matches that of a newly discovered | |
712 | * device, revive the existing fw_device. | |
713 | * The newly allocated fw_device becomes obsolete instead. | |
c781c06d | 714 | */ |
3d36a0df SR |
715 | static int lookup_existing_device(struct device *dev, void *data) |
716 | { | |
717 | struct fw_device *old = fw_device(dev); | |
718 | struct fw_device *new = data; | |
719 | struct fw_card *card = new->card; | |
720 | int match = 0; | |
721 | ||
722 | down_read(&fw_device_rwsem); /* serialize config_rom access */ | |
723 | spin_lock_irq(&card->lock); /* serialize node access */ | |
724 | ||
725 | if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && | |
726 | atomic_cmpxchg(&old->state, | |
727 | FW_DEVICE_GONE, | |
728 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
729 | struct fw_node *current_node = new->node; | |
730 | struct fw_node *obsolete_node = old->node; | |
731 | ||
732 | new->node = obsolete_node; | |
733 | new->node->data = new; | |
734 | old->node = current_node; | |
735 | old->node->data = old; | |
736 | ||
737 | old->max_speed = new->max_speed; | |
738 | old->node_id = current_node->node_id; | |
739 | smp_wmb(); /* update node_id before generation */ | |
740 | old->generation = card->generation; | |
741 | old->config_rom_retries = 0; | |
742 | fw_notify("rediscovered device %s\n", dev_name(dev)); | |
19a15b93 | 743 | |
3d36a0df SR |
744 | PREPARE_DELAYED_WORK(&old->work, fw_device_update); |
745 | schedule_delayed_work(&old->work, 0); | |
746 | ||
747 | if (current_node == card->root_node) | |
748 | fw_schedule_bm_work(card, 0); | |
749 | ||
750 | match = 1; | |
751 | } | |
752 | ||
753 | spin_unlock_irq(&card->lock); | |
754 | up_read(&fw_device_rwsem); | |
755 | ||
756 | return match; | |
757 | } | |
19a15b93 KH |
758 | |
759 | static void fw_device_init(struct work_struct *work) | |
760 | { | |
19a15b93 KH |
761 | struct fw_device *device = |
762 | container_of(work, struct fw_device, work.work); | |
3d36a0df | 763 | struct device *revived_dev; |
a3aca3da | 764 | int minor, err; |
19a15b93 | 765 | |
c781c06d KH |
766 | /* |
767 | * All failure paths here set node->data to NULL, so that we | |
19a15b93 | 768 | * don't try to do device_for_each_child() on a kfree()'d |
c781c06d KH |
769 | * device. |
770 | */ | |
19a15b93 | 771 | |
f8d2dc39 | 772 | if (read_bus_info_block(device, device->generation) < 0) { |
855c603d SR |
773 | if (device->config_rom_retries < MAX_RETRIES && |
774 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
19a15b93 KH |
775 | device->config_rom_retries++; |
776 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
777 | } else { | |
907293d7 | 778 | fw_notify("giving up on config rom for node id %x\n", |
19a15b93 | 779 | device->node_id); |
931c4834 | 780 | if (device->node == device->card->root_node) |
0fa1986f | 781 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
782 | fw_device_release(&device->device); |
783 | } | |
784 | return; | |
785 | } | |
786 | ||
3d36a0df SR |
787 | revived_dev = device_find_child(device->card->device, |
788 | device, lookup_existing_device); | |
789 | if (revived_dev) { | |
790 | put_device(revived_dev); | |
791 | fw_device_release(&device->device); | |
792 | ||
793 | return; | |
794 | } | |
795 | ||
62305823 | 796 | device_initialize(&device->device); |
96b19062 SR |
797 | |
798 | fw_device_get(device); | |
c9755e14 | 799 | down_write(&fw_device_rwsem); |
62305823 SR |
800 | err = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? |
801 | idr_get_new(&fw_device_idr, device, &minor) : | |
802 | -ENOMEM; | |
c9755e14 | 803 | up_write(&fw_device_rwsem); |
96b19062 | 804 | |
a3aca3da KH |
805 | if (err < 0) |
806 | goto error; | |
807 | ||
19a15b93 | 808 | device->device.bus = &fw_bus_type; |
21351dbe | 809 | device->device.type = &fw_device_type; |
19a15b93 | 810 | device->device.parent = device->card->device; |
a3aca3da | 811 | device->device.devt = MKDEV(fw_cdev_major, minor); |
a1f64819 | 812 | dev_set_name(&device->device, "fw%d", minor); |
19a15b93 | 813 | |
6f2e53d5 KH |
814 | init_fw_attribute_group(&device->device, |
815 | fw_device_attributes, | |
816 | &device->attribute_group); | |
19a15b93 KH |
817 | if (device_add(&device->device)) { |
818 | fw_error("Failed to add device.\n"); | |
a3aca3da | 819 | goto error_with_cdev; |
19a15b93 KH |
820 | } |
821 | ||
19a15b93 KH |
822 | create_units(device); |
823 | ||
c781c06d KH |
824 | /* |
825 | * Transition the device to running state. If it got pulled | |
19a15b93 KH |
826 | * out from under us while we did the intialization work, we |
827 | * have to shut down the device again here. Normally, though, | |
828 | * fw_node_event will be responsible for shutting it down when | |
829 | * necessary. We have to use the atomic cmpxchg here to avoid | |
830 | * racing with the FW_NODE_DESTROYED case in | |
c781c06d KH |
831 | * fw_node_event(). |
832 | */ | |
641f8791 | 833 | if (atomic_cmpxchg(&device->state, |
3d36a0df SR |
834 | FW_DEVICE_INITIALIZING, |
835 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { | |
836 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
837 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
fa6e697b SR |
838 | } else { |
839 | if (device->config_rom_retries) | |
840 | fw_notify("created device %s: GUID %08x%08x, S%d00, " | |
841 | "%d config ROM retries\n", | |
a1f64819 | 842 | dev_name(&device->device), |
fa6e697b SR |
843 | device->config_rom[3], device->config_rom[4], |
844 | 1 << device->max_speed, | |
845 | device->config_rom_retries); | |
846 | else | |
847 | fw_notify("created device %s: GUID %08x%08x, S%d00\n", | |
a1f64819 | 848 | dev_name(&device->device), |
fa6e697b SR |
849 | device->config_rom[3], device->config_rom[4], |
850 | 1 << device->max_speed); | |
c9755e14 | 851 | device->config_rom_retries = 0; |
fa6e697b | 852 | } |
19a15b93 | 853 | |
c781c06d KH |
854 | /* |
855 | * Reschedule the IRM work if we just finished reading the | |
19a15b93 KH |
856 | * root node config rom. If this races with a bus reset we |
857 | * just end up running the IRM work a couple of extra times - | |
c781c06d KH |
858 | * pretty harmless. |
859 | */ | |
19a15b93 | 860 | if (device->node == device->card->root_node) |
0fa1986f | 861 | fw_schedule_bm_work(device->card, 0); |
19a15b93 KH |
862 | |
863 | return; | |
864 | ||
a3aca3da | 865 | error_with_cdev: |
c9755e14 | 866 | down_write(&fw_device_rwsem); |
a3aca3da | 867 | idr_remove(&fw_device_idr, minor); |
c9755e14 | 868 | up_write(&fw_device_rwsem); |
373b2edd | 869 | error: |
96b19062 SR |
870 | fw_device_put(device); /* fw_device_idr's reference */ |
871 | ||
872 | put_device(&device->device); /* our reference */ | |
19a15b93 KH |
873 | } |
874 | ||
c9755e14 SR |
875 | enum { |
876 | REREAD_BIB_ERROR, | |
877 | REREAD_BIB_GONE, | |
878 | REREAD_BIB_UNCHANGED, | |
879 | REREAD_BIB_CHANGED, | |
880 | }; | |
881 | ||
882 | /* Reread and compare bus info block and header of root directory */ | |
883 | static int reread_bus_info_block(struct fw_device *device, int generation) | |
884 | { | |
885 | u32 q; | |
886 | int i; | |
887 | ||
888 | for (i = 0; i < 6; i++) { | |
889 | if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) | |
890 | return REREAD_BIB_ERROR; | |
891 | ||
892 | if (i == 0 && q == 0) | |
893 | return REREAD_BIB_GONE; | |
894 | ||
d01b0178 | 895 | if (q != device->config_rom[i]) |
c9755e14 SR |
896 | return REREAD_BIB_CHANGED; |
897 | } | |
898 | ||
899 | return REREAD_BIB_UNCHANGED; | |
900 | } | |
901 | ||
902 | static void fw_device_refresh(struct work_struct *work) | |
903 | { | |
904 | struct fw_device *device = | |
905 | container_of(work, struct fw_device, work.work); | |
906 | struct fw_card *card = device->card; | |
907 | int node_id = device->node_id; | |
908 | ||
909 | switch (reread_bus_info_block(device, device->generation)) { | |
910 | case REREAD_BIB_ERROR: | |
911 | if (device->config_rom_retries < MAX_RETRIES / 2 && | |
912 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
913 | device->config_rom_retries++; | |
914 | schedule_delayed_work(&device->work, RETRY_DELAY / 2); | |
915 | ||
916 | return; | |
917 | } | |
918 | goto give_up; | |
919 | ||
920 | case REREAD_BIB_GONE: | |
921 | goto gone; | |
922 | ||
923 | case REREAD_BIB_UNCHANGED: | |
924 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
925 | FW_DEVICE_INITIALIZING, |
926 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
927 | goto gone; |
928 | ||
929 | fw_device_update(work); | |
930 | device->config_rom_retries = 0; | |
931 | goto out; | |
932 | ||
933 | case REREAD_BIB_CHANGED: | |
934 | break; | |
935 | } | |
936 | ||
937 | /* | |
938 | * Something changed. We keep things simple and don't investigate | |
939 | * further. We just destroy all previous units and create new ones. | |
940 | */ | |
941 | device_for_each_child(&device->device, NULL, shutdown_unit); | |
942 | ||
943 | if (read_bus_info_block(device, device->generation) < 0) { | |
944 | if (device->config_rom_retries < MAX_RETRIES && | |
945 | atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { | |
946 | device->config_rom_retries++; | |
947 | schedule_delayed_work(&device->work, RETRY_DELAY); | |
948 | ||
949 | return; | |
950 | } | |
951 | goto give_up; | |
952 | } | |
953 | ||
954 | create_units(device); | |
955 | ||
956 | if (atomic_cmpxchg(&device->state, | |
3d36a0df SR |
957 | FW_DEVICE_INITIALIZING, |
958 | FW_DEVICE_RUNNING) == FW_DEVICE_GONE) | |
c9755e14 SR |
959 | goto gone; |
960 | ||
a1f64819 | 961 | fw_notify("refreshed device %s\n", dev_name(&device->device)); |
c9755e14 SR |
962 | device->config_rom_retries = 0; |
963 | goto out; | |
964 | ||
965 | give_up: | |
a1f64819 | 966 | fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); |
c9755e14 | 967 | gone: |
3d36a0df SR |
968 | atomic_set(&device->state, FW_DEVICE_GONE); |
969 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); | |
970 | schedule_delayed_work(&device->work, SHUTDOWN_DELAY); | |
c9755e14 SR |
971 | out: |
972 | if (node_id == card->root_node->node_id) | |
0fa1986f | 973 | fw_schedule_bm_work(card, 0); |
c9755e14 SR |
974 | } |
975 | ||
19a15b93 KH |
976 | void fw_node_event(struct fw_card *card, struct fw_node *node, int event) |
977 | { | |
978 | struct fw_device *device; | |
979 | ||
19a15b93 KH |
980 | switch (event) { |
981 | case FW_NODE_CREATED: | |
982 | case FW_NODE_LINK_ON: | |
983 | if (!node->link_on) | |
984 | break; | |
c9755e14 | 985 | create: |
19a15b93 KH |
986 | device = kzalloc(sizeof(*device), GFP_ATOMIC); |
987 | if (device == NULL) | |
988 | break; | |
989 | ||
c781c06d KH |
990 | /* |
991 | * Do minimal intialization of the device here, the | |
62305823 SR |
992 | * rest will happen in fw_device_init(). |
993 | * | |
994 | * Attention: A lot of things, even fw_device_get(), | |
995 | * cannot be done before fw_device_init() finished! | |
996 | * You can basically just check device->state and | |
997 | * schedule work until then, but only while holding | |
998 | * card->lock. | |
c781c06d | 999 | */ |
641f8791 | 1000 | atomic_set(&device->state, FW_DEVICE_INITIALIZING); |
459f7923 | 1001 | device->card = fw_card_get(card); |
19a15b93 KH |
1002 | device->node = fw_node_get(node); |
1003 | device->node_id = node->node_id; | |
1004 | device->generation = card->generation; | |
d67cfb96 | 1005 | mutex_init(&device->client_list_mutex); |
97bd9efa | 1006 | INIT_LIST_HEAD(&device->client_list); |
19a15b93 | 1007 | |
c781c06d KH |
1008 | /* |
1009 | * Set the node data to point back to this device so | |
19a15b93 | 1010 | * FW_NODE_UPDATED callbacks can update the node_id |
c781c06d KH |
1011 | * and generation for the device. |
1012 | */ | |
19a15b93 KH |
1013 | node->data = device; |
1014 | ||
c781c06d KH |
1015 | /* |
1016 | * Many devices are slow to respond after bus resets, | |
19a15b93 KH |
1017 | * especially if they are bus powered and go through |
1018 | * power-up after getting plugged in. We schedule the | |
c781c06d KH |
1019 | * first config rom scan half a second after bus reset. |
1020 | */ | |
19a15b93 KH |
1021 | INIT_DELAYED_WORK(&device->work, fw_device_init); |
1022 | schedule_delayed_work(&device->work, INITIAL_DELAY); | |
1023 | break; | |
1024 | ||
c9755e14 SR |
1025 | case FW_NODE_INITIATED_RESET: |
1026 | device = node->data; | |
1027 | if (device == NULL) | |
1028 | goto create; | |
1029 | ||
1030 | device->node_id = node->node_id; | |
1031 | smp_wmb(); /* update node_id before generation */ | |
1032 | device->generation = card->generation; | |
1033 | if (atomic_cmpxchg(&device->state, | |
1034 | FW_DEVICE_RUNNING, | |
1035 | FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { | |
1036 | PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); | |
1037 | schedule_delayed_work(&device->work, | |
1038 | node == card->local_node ? 0 : INITIAL_DELAY); | |
1039 | } | |
1040 | break; | |
1041 | ||
19a15b93 KH |
1042 | case FW_NODE_UPDATED: |
1043 | if (!node->link_on || node->data == NULL) | |
1044 | break; | |
1045 | ||
1046 | device = node->data; | |
1047 | device->node_id = node->node_id; | |
b5d2a5e0 | 1048 | smp_wmb(); /* update node_id before generation */ |
19a15b93 | 1049 | device->generation = card->generation; |
5f480477 KH |
1050 | if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { |
1051 | PREPARE_DELAYED_WORK(&device->work, fw_device_update); | |
1052 | schedule_delayed_work(&device->work, 0); | |
1053 | } | |
19a15b93 KH |
1054 | break; |
1055 | ||
1056 | case FW_NODE_DESTROYED: | |
1057 | case FW_NODE_LINK_OFF: | |
1058 | if (!node->data) | |
1059 | break; | |
1060 | ||
c781c06d KH |
1061 | /* |
1062 | * Destroy the device associated with the node. There | |
19a15b93 KH |
1063 | * are two cases here: either the device is fully |
1064 | * initialized (FW_DEVICE_RUNNING) or we're in the | |
1065 | * process of reading its config rom | |
1066 | * (FW_DEVICE_INITIALIZING). If it is fully | |
1067 | * initialized we can reuse device->work to schedule a | |
1068 | * full fw_device_shutdown(). If not, there's work | |
1069 | * scheduled to read it's config rom, and we just put | |
1070 | * the device in shutdown state to have that code fail | |
c781c06d KH |
1071 | * to create the device. |
1072 | */ | |
19a15b93 | 1073 | device = node->data; |
641f8791 | 1074 | if (atomic_xchg(&device->state, |
3d36a0df | 1075 | FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { |
5f480477 | 1076 | PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); |
e747a5c0 SR |
1077 | schedule_delayed_work(&device->work, |
1078 | list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); | |
19a15b93 KH |
1079 | } |
1080 | break; | |
1081 | } | |
1082 | } |