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Commit | Line | Data |
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07e4a3e2 | 1 | /* |
4a3ad20c | 2 | * drivers/base/dd.c - The core device/driver interactions. |
07e4a3e2 | 3 | * |
4a3ad20c GKH |
4 | * This file contains the (sometimes tricky) code that controls the |
5 | * interactions between devices and drivers, which primarily includes | |
6 | * driver binding and unbinding. | |
07e4a3e2 | 7 | * |
4a3ad20c GKH |
8 | * All of this code used to exist in drivers/base/bus.c, but was |
9 | * relocated to here in the name of compartmentalization (since it wasn't | |
10 | * strictly code just for the 'struct bus_type'. | |
07e4a3e2 | 11 | * |
4a3ad20c GKH |
12 | * Copyright (c) 2002-5 Patrick Mochel |
13 | * Copyright (c) 2002-3 Open Source Development Labs | |
b4028437 GKH |
14 | * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de> |
15 | * Copyright (c) 2007-2009 Novell Inc. | |
07e4a3e2 | 16 | * |
4a3ad20c | 17 | * This file is released under the GPLv2 |
07e4a3e2 PM |
18 | */ |
19 | ||
20 | #include <linux/device.h> | |
216773a7 | 21 | #include <linux/delay.h> |
07e4a3e2 | 22 | #include <linux/module.h> |
d779249e | 23 | #include <linux/kthread.h> |
735a7ffb | 24 | #include <linux/wait.h> |
216773a7 | 25 | #include <linux/async.h> |
5e928f77 | 26 | #include <linux/pm_runtime.h> |
07e4a3e2 PM |
27 | |
28 | #include "base.h" | |
29 | #include "power/power.h" | |
30 | ||
d1c3414c GL |
31 | /* |
32 | * Deferred Probe infrastructure. | |
33 | * | |
34 | * Sometimes driver probe order matters, but the kernel doesn't always have | |
35 | * dependency information which means some drivers will get probed before a | |
36 | * resource it depends on is available. For example, an SDHCI driver may | |
37 | * first need a GPIO line from an i2c GPIO controller before it can be | |
38 | * initialized. If a required resource is not available yet, a driver can | |
39 | * request probing to be deferred by returning -EPROBE_DEFER from its probe hook | |
40 | * | |
41 | * Deferred probe maintains two lists of devices, a pending list and an active | |
42 | * list. A driver returning -EPROBE_DEFER causes the device to be added to the | |
43 | * pending list. A successful driver probe will trigger moving all devices | |
44 | * from the pending to the active list so that the workqueue will eventually | |
45 | * retry them. | |
46 | * | |
47 | * The deferred_probe_mutex must be held any time the deferred_probe_*_list | |
ef8a3fd6 | 48 | * of the (struct device*)->p->deferred_probe pointers are manipulated |
d1c3414c GL |
49 | */ |
50 | static DEFINE_MUTEX(deferred_probe_mutex); | |
51 | static LIST_HEAD(deferred_probe_pending_list); | |
52 | static LIST_HEAD(deferred_probe_active_list); | |
53 | static struct workqueue_struct *deferred_wq; | |
54 | ||
55 | /** | |
56 | * deferred_probe_work_func() - Retry probing devices in the active list. | |
57 | */ | |
58 | static void deferred_probe_work_func(struct work_struct *work) | |
59 | { | |
60 | struct device *dev; | |
ef8a3fd6 | 61 | struct device_private *private; |
d1c3414c GL |
62 | /* |
63 | * This block processes every device in the deferred 'active' list. | |
64 | * Each device is removed from the active list and passed to | |
65 | * bus_probe_device() to re-attempt the probe. The loop continues | |
66 | * until every device in the active list is removed and retried. | |
67 | * | |
68 | * Note: Once the device is removed from the list and the mutex is | |
69 | * released, it is possible for the device get freed by another thread | |
70 | * and cause a illegal pointer dereference. This code uses | |
71 | * get/put_device() to ensure the device structure cannot disappear | |
72 | * from under our feet. | |
73 | */ | |
74 | mutex_lock(&deferred_probe_mutex); | |
75 | while (!list_empty(&deferred_probe_active_list)) { | |
ef8a3fd6 GKH |
76 | private = list_first_entry(&deferred_probe_active_list, |
77 | typeof(*dev->p), deferred_probe); | |
78 | dev = private->device; | |
79 | list_del_init(&private->deferred_probe); | |
d1c3414c GL |
80 | |
81 | get_device(dev); | |
82 | ||
8b0372a2 GKH |
83 | /* |
84 | * Drop the mutex while probing each device; the probe path may | |
85 | * manipulate the deferred list | |
86 | */ | |
d1c3414c | 87 | mutex_unlock(&deferred_probe_mutex); |
8153584e MB |
88 | |
89 | /* | |
90 | * Force the device to the end of the dpm_list since | |
91 | * the PM code assumes that the order we add things to | |
92 | * the list is a good order for suspend but deferred | |
93 | * probe makes that very unsafe. | |
94 | */ | |
95 | device_pm_lock(); | |
96 | device_pm_move_last(dev); | |
97 | device_pm_unlock(); | |
98 | ||
d1c3414c GL |
99 | dev_dbg(dev, "Retrying from deferred list\n"); |
100 | bus_probe_device(dev); | |
8153584e | 101 | |
d1c3414c GL |
102 | mutex_lock(&deferred_probe_mutex); |
103 | ||
104 | put_device(dev); | |
105 | } | |
106 | mutex_unlock(&deferred_probe_mutex); | |
107 | } | |
108 | static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func); | |
109 | ||
110 | static void driver_deferred_probe_add(struct device *dev) | |
111 | { | |
112 | mutex_lock(&deferred_probe_mutex); | |
ef8a3fd6 | 113 | if (list_empty(&dev->p->deferred_probe)) { |
d1c3414c | 114 | dev_dbg(dev, "Added to deferred list\n"); |
1d29cfa5 | 115 | list_add_tail(&dev->p->deferred_probe, &deferred_probe_pending_list); |
d1c3414c GL |
116 | } |
117 | mutex_unlock(&deferred_probe_mutex); | |
118 | } | |
119 | ||
120 | void driver_deferred_probe_del(struct device *dev) | |
121 | { | |
122 | mutex_lock(&deferred_probe_mutex); | |
ef8a3fd6 | 123 | if (!list_empty(&dev->p->deferred_probe)) { |
d1c3414c | 124 | dev_dbg(dev, "Removed from deferred list\n"); |
ef8a3fd6 | 125 | list_del_init(&dev->p->deferred_probe); |
d1c3414c GL |
126 | } |
127 | mutex_unlock(&deferred_probe_mutex); | |
128 | } | |
129 | ||
130 | static bool driver_deferred_probe_enable = false; | |
131 | /** | |
132 | * driver_deferred_probe_trigger() - Kick off re-probing deferred devices | |
133 | * | |
134 | * This functions moves all devices from the pending list to the active | |
135 | * list and schedules the deferred probe workqueue to process them. It | |
136 | * should be called anytime a driver is successfully bound to a device. | |
137 | */ | |
138 | static void driver_deferred_probe_trigger(void) | |
139 | { | |
140 | if (!driver_deferred_probe_enable) | |
141 | return; | |
142 | ||
8b0372a2 GKH |
143 | /* |
144 | * A successful probe means that all the devices in the pending list | |
d1c3414c | 145 | * should be triggered to be reprobed. Move all the deferred devices |
8b0372a2 GKH |
146 | * into the active list so they can be retried by the workqueue |
147 | */ | |
d1c3414c GL |
148 | mutex_lock(&deferred_probe_mutex); |
149 | list_splice_tail_init(&deferred_probe_pending_list, | |
150 | &deferred_probe_active_list); | |
151 | mutex_unlock(&deferred_probe_mutex); | |
152 | ||
8b0372a2 GKH |
153 | /* |
154 | * Kick the re-probe thread. It may already be scheduled, but it is | |
155 | * safe to kick it again. | |
156 | */ | |
d1c3414c GL |
157 | queue_work(deferred_wq, &deferred_probe_work); |
158 | } | |
159 | ||
160 | /** | |
161 | * deferred_probe_initcall() - Enable probing of deferred devices | |
162 | * | |
163 | * We don't want to get in the way when the bulk of drivers are getting probed. | |
164 | * Instead, this initcall makes sure that deferred probing is delayed until | |
165 | * late_initcall time. | |
166 | */ | |
167 | static int deferred_probe_initcall(void) | |
168 | { | |
169 | deferred_wq = create_singlethread_workqueue("deferwq"); | |
170 | if (WARN_ON(!deferred_wq)) | |
171 | return -ENOMEM; | |
172 | ||
173 | driver_deferred_probe_enable = true; | |
174 | driver_deferred_probe_trigger(); | |
175 | return 0; | |
176 | } | |
177 | late_initcall(deferred_probe_initcall); | |
07e4a3e2 | 178 | |
1901fb26 | 179 | static void driver_bound(struct device *dev) |
07e4a3e2 | 180 | { |
8940b4f3 | 181 | if (klist_node_attached(&dev->p->knode_driver)) { |
f86db396 | 182 | printk(KERN_WARNING "%s: device %s already bound\n", |
2b3a302a | 183 | __func__, kobject_name(&dev->kobj)); |
1901fb26 | 184 | return; |
f86db396 | 185 | } |
4c898c7f | 186 | |
1e0b2cf9 | 187 | pr_debug("driver: '%s': %s: bound to device '%s'\n", dev_name(dev), |
2b3a302a | 188 | __func__, dev->driver->name); |
116af378 | 189 | |
fbb88fad SS |
190 | klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices); |
191 | ||
8b0372a2 GKH |
192 | /* |
193 | * Make sure the device is no longer in one of the deferred lists and | |
194 | * kick off retrying all pending devices | |
195 | */ | |
d1c3414c GL |
196 | driver_deferred_probe_del(dev); |
197 | driver_deferred_probe_trigger(); | |
198 | ||
116af378 | 199 | if (dev->bus) |
c6f7e72a | 200 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 201 | BUS_NOTIFY_BOUND_DRIVER, dev); |
1901fb26 KS |
202 | } |
203 | ||
204 | static int driver_sysfs_add(struct device *dev) | |
205 | { | |
206 | int ret; | |
207 | ||
45daef0f MD |
208 | if (dev->bus) |
209 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
210 | BUS_NOTIFY_BIND_DRIVER, dev); | |
211 | ||
e5dd1278 | 212 | ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj, |
07e4a3e2 | 213 | kobject_name(&dev->kobj)); |
f86db396 | 214 | if (ret == 0) { |
e5dd1278 | 215 | ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj, |
f86db396 AM |
216 | "driver"); |
217 | if (ret) | |
e5dd1278 | 218 | sysfs_remove_link(&dev->driver->p->kobj, |
f86db396 AM |
219 | kobject_name(&dev->kobj)); |
220 | } | |
221 | return ret; | |
07e4a3e2 PM |
222 | } |
223 | ||
1901fb26 KS |
224 | static void driver_sysfs_remove(struct device *dev) |
225 | { | |
226 | struct device_driver *drv = dev->driver; | |
227 | ||
228 | if (drv) { | |
e5dd1278 | 229 | sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj)); |
1901fb26 KS |
230 | sysfs_remove_link(&dev->kobj, "driver"); |
231 | } | |
232 | } | |
233 | ||
234 | /** | |
4a3ad20c GKH |
235 | * device_bind_driver - bind a driver to one device. |
236 | * @dev: device. | |
1901fb26 | 237 | * |
4a3ad20c GKH |
238 | * Allow manual attachment of a driver to a device. |
239 | * Caller must have already set @dev->driver. | |
1901fb26 | 240 | * |
4a3ad20c GKH |
241 | * Note that this does not modify the bus reference count |
242 | * nor take the bus's rwsem. Please verify those are accounted | |
243 | * for before calling this. (It is ok to call with no other effort | |
244 | * from a driver's probe() method.) | |
1901fb26 | 245 | * |
8e9394ce | 246 | * This function must be called with the device lock held. |
1901fb26 KS |
247 | */ |
248 | int device_bind_driver(struct device *dev) | |
249 | { | |
cb986b74 CH |
250 | int ret; |
251 | ||
252 | ret = driver_sysfs_add(dev); | |
253 | if (!ret) | |
254 | driver_bound(dev); | |
255 | return ret; | |
1901fb26 | 256 | } |
4a3ad20c | 257 | EXPORT_SYMBOL_GPL(device_bind_driver); |
1901fb26 | 258 | |
d779249e | 259 | static atomic_t probe_count = ATOMIC_INIT(0); |
735a7ffb AM |
260 | static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue); |
261 | ||
21c7f30b | 262 | static int really_probe(struct device *dev, struct device_driver *drv) |
07e4a3e2 | 263 | { |
0d3e5a2e | 264 | int ret = 0; |
07e4a3e2 | 265 | |
d779249e | 266 | atomic_inc(&probe_count); |
7dc72b28 | 267 | pr_debug("bus: '%s': %s: probing driver %s with device %s\n", |
1e0b2cf9 | 268 | drv->bus->name, __func__, drv->name, dev_name(dev)); |
9ac7849e | 269 | WARN_ON(!list_empty(&dev->devres_head)); |
07e4a3e2 | 270 | |
07e4a3e2 | 271 | dev->driver = drv; |
1901fb26 KS |
272 | if (driver_sysfs_add(dev)) { |
273 | printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n", | |
1e0b2cf9 | 274 | __func__, dev_name(dev)); |
1901fb26 KS |
275 | goto probe_failed; |
276 | } | |
277 | ||
594c8281 RK |
278 | if (dev->bus->probe) { |
279 | ret = dev->bus->probe(dev); | |
1901fb26 | 280 | if (ret) |
d779249e | 281 | goto probe_failed; |
594c8281 | 282 | } else if (drv->probe) { |
0d3e5a2e | 283 | ret = drv->probe(dev); |
1901fb26 | 284 | if (ret) |
d779249e | 285 | goto probe_failed; |
f86db396 | 286 | } |
1901fb26 KS |
287 | |
288 | driver_bound(dev); | |
0d3e5a2e | 289 | ret = 1; |
7dc72b28 | 290 | pr_debug("bus: '%s': %s: bound device %s to driver %s\n", |
1e0b2cf9 | 291 | drv->bus->name, __func__, dev_name(dev), drv->name); |
d779249e | 292 | goto done; |
0d3e5a2e | 293 | |
d779249e | 294 | probe_failed: |
9ac7849e | 295 | devres_release_all(dev); |
1901fb26 KS |
296 | driver_sysfs_remove(dev); |
297 | dev->driver = NULL; | |
0998d063 | 298 | dev_set_drvdata(dev, NULL); |
1901fb26 | 299 | |
d1c3414c GL |
300 | if (ret == -EPROBE_DEFER) { |
301 | /* Driver requested deferred probing */ | |
302 | dev_info(dev, "Driver %s requests probe deferral\n", drv->name); | |
303 | driver_deferred_probe_add(dev); | |
304 | } else if (ret != -ENODEV && ret != -ENXIO) { | |
0d3e5a2e PM |
305 | /* driver matched but the probe failed */ |
306 | printk(KERN_WARNING | |
307 | "%s: probe of %s failed with error %d\n", | |
1e0b2cf9 | 308 | drv->name, dev_name(dev), ret); |
bcbe4f94 WS |
309 | } else { |
310 | pr_debug("%s: probe of %s rejects match %d\n", | |
311 | drv->name, dev_name(dev), ret); | |
0d3e5a2e | 312 | } |
c578abbc CH |
313 | /* |
314 | * Ignore errors returned by ->probe so that the next driver can try | |
315 | * its luck. | |
316 | */ | |
317 | ret = 0; | |
d779249e | 318 | done: |
d779249e | 319 | atomic_dec(&probe_count); |
735a7ffb | 320 | wake_up(&probe_waitqueue); |
d779249e GKH |
321 | return ret; |
322 | } | |
323 | ||
324 | /** | |
325 | * driver_probe_done | |
326 | * Determine if the probe sequence is finished or not. | |
327 | * | |
328 | * Should somehow figure out how to use a semaphore, not an atomic variable... | |
329 | */ | |
330 | int driver_probe_done(void) | |
331 | { | |
2b3a302a | 332 | pr_debug("%s: probe_count = %d\n", __func__, |
d779249e GKH |
333 | atomic_read(&probe_count)); |
334 | if (atomic_read(&probe_count)) | |
335 | return -EBUSY; | |
336 | return 0; | |
337 | } | |
338 | ||
216773a7 AV |
339 | /** |
340 | * wait_for_device_probe | |
341 | * Wait for device probing to be completed. | |
216773a7 | 342 | */ |
b23530eb | 343 | void wait_for_device_probe(void) |
216773a7 AV |
344 | { |
345 | /* wait for the known devices to complete their probing */ | |
b23530eb | 346 | wait_event(probe_waitqueue, atomic_read(&probe_count) == 0); |
216773a7 | 347 | async_synchronize_full(); |
216773a7 | 348 | } |
d4d5291c | 349 | EXPORT_SYMBOL_GPL(wait_for_device_probe); |
216773a7 | 350 | |
d779249e GKH |
351 | /** |
352 | * driver_probe_device - attempt to bind device & driver together | |
353 | * @drv: driver to bind a device to | |
354 | * @dev: device to try to bind to the driver | |
355 | * | |
49b420a1 | 356 | * This function returns -ENODEV if the device is not registered, |
af901ca1 | 357 | * 1 if the device is bound successfully and 0 otherwise. |
d779249e | 358 | * |
8e9394ce GKH |
359 | * This function must be called with @dev lock held. When called for a |
360 | * USB interface, @dev->parent lock must be held as well. | |
d779249e | 361 | */ |
4a3ad20c | 362 | int driver_probe_device(struct device_driver *drv, struct device *dev) |
d779249e | 363 | { |
d779249e GKH |
364 | int ret = 0; |
365 | ||
f2eaae19 AS |
366 | if (!device_is_registered(dev)) |
367 | return -ENODEV; | |
d779249e | 368 | |
7dc72b28 | 369 | pr_debug("bus: '%s': %s: matched device %s with driver %s\n", |
1e0b2cf9 | 370 | drv->bus->name, __func__, dev_name(dev), drv->name); |
d779249e | 371 | |
5e928f77 RW |
372 | pm_runtime_get_noresume(dev); |
373 | pm_runtime_barrier(dev); | |
21c7f30b | 374 | ret = really_probe(dev, drv); |
5e928f77 | 375 | pm_runtime_put_sync(dev); |
d779249e | 376 | |
0d3e5a2e | 377 | return ret; |
07e4a3e2 PM |
378 | } |
379 | ||
4a3ad20c | 380 | static int __device_attach(struct device_driver *drv, void *data) |
2287c322 | 381 | { |
4a3ad20c | 382 | struct device *dev = data; |
49b420a1 ML |
383 | |
384 | if (!driver_match_device(drv, dev)) | |
385 | return 0; | |
386 | ||
0d3e5a2e | 387 | return driver_probe_device(drv, dev); |
2287c322 PM |
388 | } |
389 | ||
07e4a3e2 | 390 | /** |
4a3ad20c GKH |
391 | * device_attach - try to attach device to a driver. |
392 | * @dev: device. | |
07e4a3e2 | 393 | * |
4a3ad20c GKH |
394 | * Walk the list of drivers that the bus has and call |
395 | * driver_probe_device() for each pair. If a compatible | |
396 | * pair is found, break out and return. | |
0d3e5a2e | 397 | * |
4a3ad20c | 398 | * Returns 1 if the device was bound to a driver; |
59a3cd7f | 399 | * 0 if no matching driver was found; |
4a3ad20c | 400 | * -ENODEV if the device is not registered. |
bf74ad5b | 401 | * |
8e9394ce | 402 | * When called for a USB interface, @dev->parent lock must be held. |
07e4a3e2 | 403 | */ |
4a3ad20c | 404 | int device_attach(struct device *dev) |
07e4a3e2 | 405 | { |
0d3e5a2e PM |
406 | int ret = 0; |
407 | ||
8e9394ce | 408 | device_lock(dev); |
07e4a3e2 | 409 | if (dev->driver) { |
8497d6a2 SO |
410 | if (klist_node_attached(&dev->p->knode_driver)) { |
411 | ret = 1; | |
412 | goto out_unlock; | |
413 | } | |
f86db396 AM |
414 | ret = device_bind_driver(dev); |
415 | if (ret == 0) | |
416 | ret = 1; | |
c6a46696 CH |
417 | else { |
418 | dev->driver = NULL; | |
419 | ret = 0; | |
420 | } | |
21c7f30b | 421 | } else { |
5e928f77 | 422 | pm_runtime_get_noresume(dev); |
5adc55da | 423 | ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach); |
5e928f77 | 424 | pm_runtime_put_sync(dev); |
21c7f30b | 425 | } |
8497d6a2 | 426 | out_unlock: |
8e9394ce | 427 | device_unlock(dev); |
0d3e5a2e | 428 | return ret; |
2287c322 | 429 | } |
4a3ad20c | 430 | EXPORT_SYMBOL_GPL(device_attach); |
2287c322 | 431 | |
4a3ad20c | 432 | static int __driver_attach(struct device *dev, void *data) |
2287c322 | 433 | { |
4a3ad20c | 434 | struct device_driver *drv = data; |
0d3e5a2e PM |
435 | |
436 | /* | |
437 | * Lock device and try to bind to it. We drop the error | |
438 | * here and always return 0, because we need to keep trying | |
439 | * to bind to devices and some drivers will return an error | |
440 | * simply if it didn't support the device. | |
441 | * | |
442 | * driver_probe_device() will spit a warning if there | |
443 | * is an error. | |
444 | */ | |
445 | ||
49b420a1 | 446 | if (!driver_match_device(drv, dev)) |
6cd49586 AV |
447 | return 0; |
448 | ||
bf74ad5b | 449 | if (dev->parent) /* Needed for USB */ |
8e9394ce GKH |
450 | device_lock(dev->parent); |
451 | device_lock(dev); | |
0d3e5a2e PM |
452 | if (!dev->driver) |
453 | driver_probe_device(drv, dev); | |
8e9394ce | 454 | device_unlock(dev); |
bf74ad5b | 455 | if (dev->parent) |
8e9394ce | 456 | device_unlock(dev->parent); |
0d3e5a2e | 457 | |
07e4a3e2 PM |
458 | return 0; |
459 | } | |
460 | ||
461 | /** | |
4a3ad20c GKH |
462 | * driver_attach - try to bind driver to devices. |
463 | * @drv: driver. | |
07e4a3e2 | 464 | * |
4a3ad20c GKH |
465 | * Walk the list of devices that the bus has on it and try to |
466 | * match the driver with each one. If driver_probe_device() | |
467 | * returns 0 and the @dev->driver is set, we've found a | |
468 | * compatible pair. | |
07e4a3e2 | 469 | */ |
4a3ad20c | 470 | int driver_attach(struct device_driver *drv) |
07e4a3e2 | 471 | { |
f86db396 | 472 | return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach); |
07e4a3e2 | 473 | } |
4a3ad20c | 474 | EXPORT_SYMBOL_GPL(driver_attach); |
07e4a3e2 | 475 | |
ab71c6f0 | 476 | /* |
8e9394ce GKH |
477 | * __device_release_driver() must be called with @dev lock held. |
478 | * When called for a USB interface, @dev->parent lock must be held as well. | |
07e4a3e2 | 479 | */ |
4a3ad20c | 480 | static void __device_release_driver(struct device *dev) |
07e4a3e2 | 481 | { |
4a3ad20c | 482 | struct device_driver *drv; |
07e4a3e2 | 483 | |
ef2c5174 | 484 | drv = dev->driver; |
c95a6b05 | 485 | if (drv) { |
e1866b33 | 486 | pm_runtime_get_sync(dev); |
5e928f77 | 487 | |
1901fb26 | 488 | driver_sysfs_remove(dev); |
0d3e5a2e | 489 | |
116af378 | 490 | if (dev->bus) |
c6f7e72a | 491 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
492 | BUS_NOTIFY_UNBIND_DRIVER, |
493 | dev); | |
494 | ||
e1866b33 RW |
495 | pm_runtime_put_sync(dev); |
496 | ||
0f836ca4 | 497 | if (dev->bus && dev->bus->remove) |
594c8281 RK |
498 | dev->bus->remove(dev); |
499 | else if (drv->remove) | |
0d3e5a2e | 500 | drv->remove(dev); |
9ac7849e | 501 | devres_release_all(dev); |
0d3e5a2e | 502 | dev->driver = NULL; |
0998d063 | 503 | dev_set_drvdata(dev, NULL); |
8940b4f3 | 504 | klist_remove(&dev->p->knode_driver); |
309b7d60 JR |
505 | if (dev->bus) |
506 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
507 | BUS_NOTIFY_UNBOUND_DRIVER, | |
508 | dev); | |
5e928f77 | 509 | |
0d3e5a2e | 510 | } |
07e4a3e2 PM |
511 | } |
512 | ||
ab71c6f0 | 513 | /** |
4a3ad20c GKH |
514 | * device_release_driver - manually detach device from driver. |
515 | * @dev: device. | |
ab71c6f0 | 516 | * |
4a3ad20c | 517 | * Manually detach device from driver. |
8e9394ce | 518 | * When called for a USB interface, @dev->parent lock must be held. |
ab71c6f0 | 519 | */ |
4a3ad20c | 520 | void device_release_driver(struct device *dev) |
94e7b1c5 | 521 | { |
c95a6b05 AS |
522 | /* |
523 | * If anyone calls device_release_driver() recursively from | |
524 | * within their ->remove callback for the same device, they | |
525 | * will deadlock right here. | |
526 | */ | |
8e9394ce | 527 | device_lock(dev); |
c95a6b05 | 528 | __device_release_driver(dev); |
8e9394ce | 529 | device_unlock(dev); |
94e7b1c5 | 530 | } |
4a3ad20c | 531 | EXPORT_SYMBOL_GPL(device_release_driver); |
c95a6b05 | 532 | |
07e4a3e2 PM |
533 | /** |
534 | * driver_detach - detach driver from all devices it controls. | |
535 | * @drv: driver. | |
536 | */ | |
4a3ad20c | 537 | void driver_detach(struct device_driver *drv) |
07e4a3e2 | 538 | { |
8940b4f3 | 539 | struct device_private *dev_prv; |
4a3ad20c | 540 | struct device *dev; |
c95a6b05 AS |
541 | |
542 | for (;;) { | |
e5dd1278 GKH |
543 | spin_lock(&drv->p->klist_devices.k_lock); |
544 | if (list_empty(&drv->p->klist_devices.k_list)) { | |
545 | spin_unlock(&drv->p->klist_devices.k_lock); | |
c95a6b05 AS |
546 | break; |
547 | } | |
8940b4f3 GKH |
548 | dev_prv = list_entry(drv->p->klist_devices.k_list.prev, |
549 | struct device_private, | |
550 | knode_driver.n_node); | |
551 | dev = dev_prv->device; | |
c95a6b05 | 552 | get_device(dev); |
e5dd1278 | 553 | spin_unlock(&drv->p->klist_devices.k_lock); |
c95a6b05 | 554 | |
bf74ad5b | 555 | if (dev->parent) /* Needed for USB */ |
8e9394ce GKH |
556 | device_lock(dev->parent); |
557 | device_lock(dev); | |
c95a6b05 AS |
558 | if (dev->driver == drv) |
559 | __device_release_driver(dev); | |
8e9394ce | 560 | device_unlock(dev); |
bf74ad5b | 561 | if (dev->parent) |
8e9394ce | 562 | device_unlock(dev->parent); |
c95a6b05 AS |
563 | put_device(dev); |
564 | } | |
07e4a3e2 | 565 | } |
b4028437 GKH |
566 | |
567 | /* | |
568 | * These exports can't be _GPL due to .h files using this within them, and it | |
569 | * might break something that was previously working... | |
570 | */ | |
571 | void *dev_get_drvdata(const struct device *dev) | |
572 | { | |
573 | if (dev && dev->p) | |
574 | return dev->p->driver_data; | |
575 | return NULL; | |
576 | } | |
577 | EXPORT_SYMBOL(dev_get_drvdata); | |
578 | ||
c8705082 | 579 | int dev_set_drvdata(struct device *dev, void *data) |
b4028437 GKH |
580 | { |
581 | int error; | |
582 | ||
b4028437 GKH |
583 | if (!dev->p) { |
584 | error = device_private_init(dev); | |
585 | if (error) | |
c8705082 | 586 | return error; |
b4028437 GKH |
587 | } |
588 | dev->p->driver_data = data; | |
c8705082 | 589 | return 0; |
b4028437 GKH |
590 | } |
591 | EXPORT_SYMBOL(dev_set_drvdata); |