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989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
07e4a3e2 | 2 | /* |
4a3ad20c | 3 | * drivers/base/dd.c - The core device/driver interactions. |
07e4a3e2 | 4 | * |
4a3ad20c GKH |
5 | * This file contains the (sometimes tricky) code that controls the |
6 | * interactions between devices and drivers, which primarily includes | |
7 | * driver binding and unbinding. | |
07e4a3e2 | 8 | * |
4a3ad20c GKH |
9 | * All of this code used to exist in drivers/base/bus.c, but was |
10 | * relocated to here in the name of compartmentalization (since it wasn't | |
11 | * strictly code just for the 'struct bus_type'. | |
07e4a3e2 | 12 | * |
4a3ad20c GKH |
13 | * Copyright (c) 2002-5 Patrick Mochel |
14 | * Copyright (c) 2002-3 Open Source Development Labs | |
b4028437 GKH |
15 | * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de> |
16 | * Copyright (c) 2007-2009 Novell Inc. | |
07e4a3e2 PM |
17 | */ |
18 | ||
28af109a | 19 | #include <linux/debugfs.h> |
07e4a3e2 | 20 | #include <linux/device.h> |
216773a7 | 21 | #include <linux/delay.h> |
09515ef5 | 22 | #include <linux/dma-mapping.h> |
1f5000bd | 23 | #include <linux/init.h> |
07e4a3e2 | 24 | #include <linux/module.h> |
d779249e | 25 | #include <linux/kthread.h> |
735a7ffb | 26 | #include <linux/wait.h> |
216773a7 | 27 | #include <linux/async.h> |
5e928f77 | 28 | #include <linux/pm_runtime.h> |
ab78029e | 29 | #include <linux/pinctrl/devinfo.h> |
07e4a3e2 PM |
30 | |
31 | #include "base.h" | |
32 | #include "power/power.h" | |
33 | ||
d1c3414c GL |
34 | /* |
35 | * Deferred Probe infrastructure. | |
36 | * | |
37 | * Sometimes driver probe order matters, but the kernel doesn't always have | |
38 | * dependency information which means some drivers will get probed before a | |
39 | * resource it depends on is available. For example, an SDHCI driver may | |
40 | * first need a GPIO line from an i2c GPIO controller before it can be | |
41 | * initialized. If a required resource is not available yet, a driver can | |
42 | * request probing to be deferred by returning -EPROBE_DEFER from its probe hook | |
43 | * | |
44 | * Deferred probe maintains two lists of devices, a pending list and an active | |
45 | * list. A driver returning -EPROBE_DEFER causes the device to be added to the | |
46 | * pending list. A successful driver probe will trigger moving all devices | |
47 | * from the pending to the active list so that the workqueue will eventually | |
48 | * retry them. | |
49 | * | |
50 | * The deferred_probe_mutex must be held any time the deferred_probe_*_list | |
ef8a3fd6 | 51 | * of the (struct device*)->p->deferred_probe pointers are manipulated |
d1c3414c GL |
52 | */ |
53 | static DEFINE_MUTEX(deferred_probe_mutex); | |
54 | static LIST_HEAD(deferred_probe_pending_list); | |
55 | static LIST_HEAD(deferred_probe_active_list); | |
58b116bc | 56 | static atomic_t deferred_trigger_count = ATOMIC_INIT(0); |
28af109a | 57 | static struct dentry *deferred_devices; |
25b4e70d | 58 | static bool initcalls_done; |
d1c3414c | 59 | |
013c074f SG |
60 | /* |
61 | * In some cases, like suspend to RAM or hibernation, It might be reasonable | |
62 | * to prohibit probing of devices as it could be unsafe. | |
63 | * Once defer_all_probes is true all drivers probes will be forcibly deferred. | |
64 | */ | |
65 | static bool defer_all_probes; | |
66 | ||
41575335 | 67 | /* |
d1c3414c GL |
68 | * deferred_probe_work_func() - Retry probing devices in the active list. |
69 | */ | |
70 | static void deferred_probe_work_func(struct work_struct *work) | |
71 | { | |
72 | struct device *dev; | |
ef8a3fd6 | 73 | struct device_private *private; |
d1c3414c GL |
74 | /* |
75 | * This block processes every device in the deferred 'active' list. | |
76 | * Each device is removed from the active list and passed to | |
77 | * bus_probe_device() to re-attempt the probe. The loop continues | |
78 | * until every device in the active list is removed and retried. | |
79 | * | |
80 | * Note: Once the device is removed from the list and the mutex is | |
81 | * released, it is possible for the device get freed by another thread | |
82 | * and cause a illegal pointer dereference. This code uses | |
83 | * get/put_device() to ensure the device structure cannot disappear | |
84 | * from under our feet. | |
85 | */ | |
86 | mutex_lock(&deferred_probe_mutex); | |
87 | while (!list_empty(&deferred_probe_active_list)) { | |
ef8a3fd6 GKH |
88 | private = list_first_entry(&deferred_probe_active_list, |
89 | typeof(*dev->p), deferred_probe); | |
90 | dev = private->device; | |
91 | list_del_init(&private->deferred_probe); | |
d1c3414c GL |
92 | |
93 | get_device(dev); | |
94 | ||
8b0372a2 GKH |
95 | /* |
96 | * Drop the mutex while probing each device; the probe path may | |
97 | * manipulate the deferred list | |
98 | */ | |
d1c3414c | 99 | mutex_unlock(&deferred_probe_mutex); |
8153584e MB |
100 | |
101 | /* | |
102 | * Force the device to the end of the dpm_list since | |
103 | * the PM code assumes that the order we add things to | |
104 | * the list is a good order for suspend but deferred | |
105 | * probe makes that very unsafe. | |
106 | */ | |
494fd7b7 | 107 | device_pm_move_to_tail(dev); |
8153584e | 108 | |
d1c3414c | 109 | dev_dbg(dev, "Retrying from deferred list\n"); |
0a50f61c | 110 | bus_probe_device(dev); |
d1c3414c GL |
111 | mutex_lock(&deferred_probe_mutex); |
112 | ||
113 | put_device(dev); | |
114 | } | |
115 | mutex_unlock(&deferred_probe_mutex); | |
116 | } | |
117 | static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func); | |
118 | ||
e7dd4010 | 119 | void driver_deferred_probe_add(struct device *dev) |
d1c3414c GL |
120 | { |
121 | mutex_lock(&deferred_probe_mutex); | |
ef8a3fd6 | 122 | if (list_empty(&dev->p->deferred_probe)) { |
d1c3414c | 123 | dev_dbg(dev, "Added to deferred list\n"); |
1d29cfa5 | 124 | list_add_tail(&dev->p->deferred_probe, &deferred_probe_pending_list); |
d1c3414c GL |
125 | } |
126 | mutex_unlock(&deferred_probe_mutex); | |
127 | } | |
128 | ||
129 | void driver_deferred_probe_del(struct device *dev) | |
130 | { | |
131 | mutex_lock(&deferred_probe_mutex); | |
ef8a3fd6 | 132 | if (!list_empty(&dev->p->deferred_probe)) { |
d1c3414c | 133 | dev_dbg(dev, "Removed from deferred list\n"); |
ef8a3fd6 | 134 | list_del_init(&dev->p->deferred_probe); |
d1c3414c GL |
135 | } |
136 | mutex_unlock(&deferred_probe_mutex); | |
137 | } | |
138 | ||
139 | static bool driver_deferred_probe_enable = false; | |
140 | /** | |
141 | * driver_deferred_probe_trigger() - Kick off re-probing deferred devices | |
142 | * | |
143 | * This functions moves all devices from the pending list to the active | |
144 | * list and schedules the deferred probe workqueue to process them. It | |
145 | * should be called anytime a driver is successfully bound to a device. | |
58b116bc GL |
146 | * |
147 | * Note, there is a race condition in multi-threaded probe. In the case where | |
148 | * more than one device is probing at the same time, it is possible for one | |
149 | * probe to complete successfully while another is about to defer. If the second | |
150 | * depends on the first, then it will get put on the pending list after the | |
9ba8af66 | 151 | * trigger event has already occurred and will be stuck there. |
58b116bc GL |
152 | * |
153 | * The atomic 'deferred_trigger_count' is used to determine if a successful | |
154 | * trigger has occurred in the midst of probing a driver. If the trigger count | |
155 | * changes in the midst of a probe, then deferred processing should be triggered | |
156 | * again. | |
d1c3414c GL |
157 | */ |
158 | static void driver_deferred_probe_trigger(void) | |
159 | { | |
160 | if (!driver_deferred_probe_enable) | |
161 | return; | |
162 | ||
8b0372a2 GKH |
163 | /* |
164 | * A successful probe means that all the devices in the pending list | |
d1c3414c | 165 | * should be triggered to be reprobed. Move all the deferred devices |
8b0372a2 GKH |
166 | * into the active list so they can be retried by the workqueue |
167 | */ | |
d1c3414c | 168 | mutex_lock(&deferred_probe_mutex); |
58b116bc | 169 | atomic_inc(&deferred_trigger_count); |
d1c3414c GL |
170 | list_splice_tail_init(&deferred_probe_pending_list, |
171 | &deferred_probe_active_list); | |
172 | mutex_unlock(&deferred_probe_mutex); | |
173 | ||
8b0372a2 GKH |
174 | /* |
175 | * Kick the re-probe thread. It may already be scheduled, but it is | |
176 | * safe to kick it again. | |
177 | */ | |
2c507e46 | 178 | schedule_work(&deferred_probe_work); |
d1c3414c GL |
179 | } |
180 | ||
013c074f | 181 | /** |
dbf03d65 | 182 | * device_block_probing() - Block/defer device's probes |
013c074f SG |
183 | * |
184 | * It will disable probing of devices and defer their probes instead. | |
185 | */ | |
186 | void device_block_probing(void) | |
187 | { | |
188 | defer_all_probes = true; | |
189 | /* sync with probes to avoid races. */ | |
190 | wait_for_device_probe(); | |
191 | } | |
192 | ||
193 | /** | |
194 | * device_unblock_probing() - Unblock/enable device's probes | |
195 | * | |
196 | * It will restore normal behavior and trigger re-probing of deferred | |
197 | * devices. | |
198 | */ | |
199 | void device_unblock_probing(void) | |
200 | { | |
201 | defer_all_probes = false; | |
202 | driver_deferred_probe_trigger(); | |
203 | } | |
204 | ||
28af109a JMC |
205 | /* |
206 | * deferred_devs_show() - Show the devices in the deferred probe pending list. | |
207 | */ | |
208 | static int deferred_devs_show(struct seq_file *s, void *data) | |
209 | { | |
210 | struct device_private *curr; | |
211 | ||
212 | mutex_lock(&deferred_probe_mutex); | |
213 | ||
214 | list_for_each_entry(curr, &deferred_probe_pending_list, deferred_probe) | |
215 | seq_printf(s, "%s\n", dev_name(curr->device)); | |
216 | ||
217 | mutex_unlock(&deferred_probe_mutex); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | DEFINE_SHOW_ATTRIBUTE(deferred_devs); | |
222 | ||
25b4e70d RH |
223 | static int deferred_probe_timeout = -1; |
224 | static int __init deferred_probe_timeout_setup(char *str) | |
225 | { | |
63c98047 MS |
226 | int timeout; |
227 | ||
228 | if (!kstrtoint(str, 10, &timeout)) | |
229 | deferred_probe_timeout = timeout; | |
25b4e70d RH |
230 | return 1; |
231 | } | |
232 | __setup("deferred_probe_timeout=", deferred_probe_timeout_setup); | |
233 | ||
234 | /** | |
235 | * driver_deferred_probe_check_state() - Check deferred probe state | |
236 | * @dev: device to check | |
237 | * | |
238 | * Returns -ENODEV if init is done and all built-in drivers have had a chance | |
239 | * to probe (i.e. initcalls are done), -ETIMEDOUT if deferred probe debug | |
240 | * timeout has expired, or -EPROBE_DEFER if none of those conditions are met. | |
241 | * | |
242 | * Drivers or subsystems can opt-in to calling this function instead of directly | |
243 | * returning -EPROBE_DEFER. | |
244 | */ | |
245 | int driver_deferred_probe_check_state(struct device *dev) | |
246 | { | |
247 | if (initcalls_done) { | |
248 | if (!deferred_probe_timeout) { | |
249 | dev_WARN(dev, "deferred probe timeout, ignoring dependency"); | |
250 | return -ETIMEDOUT; | |
251 | } | |
252 | dev_warn(dev, "ignoring dependency for device, assuming no driver"); | |
253 | return -ENODEV; | |
254 | } | |
255 | return -EPROBE_DEFER; | |
256 | } | |
257 | ||
258 | static void deferred_probe_timeout_work_func(struct work_struct *work) | |
259 | { | |
260 | struct device_private *private, *p; | |
261 | ||
262 | deferred_probe_timeout = 0; | |
263 | driver_deferred_probe_trigger(); | |
264 | flush_work(&deferred_probe_work); | |
265 | ||
266 | list_for_each_entry_safe(private, p, &deferred_probe_pending_list, deferred_probe) | |
267 | dev_info(private->device, "deferred probe pending"); | |
268 | } | |
269 | static DECLARE_DELAYED_WORK(deferred_probe_timeout_work, deferred_probe_timeout_work_func); | |
270 | ||
d1c3414c GL |
271 | /** |
272 | * deferred_probe_initcall() - Enable probing of deferred devices | |
273 | * | |
274 | * We don't want to get in the way when the bulk of drivers are getting probed. | |
275 | * Instead, this initcall makes sure that deferred probing is delayed until | |
276 | * late_initcall time. | |
277 | */ | |
278 | static int deferred_probe_initcall(void) | |
279 | { | |
28af109a JMC |
280 | deferred_devices = debugfs_create_file("devices_deferred", 0444, NULL, |
281 | NULL, &deferred_devs_fops); | |
282 | ||
d1c3414c GL |
283 | driver_deferred_probe_enable = true; |
284 | driver_deferred_probe_trigger(); | |
d72cca1e | 285 | /* Sort as many dependencies as possible before exiting initcalls */ |
2c507e46 | 286 | flush_work(&deferred_probe_work); |
25b4e70d RH |
287 | initcalls_done = true; |
288 | ||
289 | /* | |
290 | * Trigger deferred probe again, this time we won't defer anything | |
291 | * that is optional | |
292 | */ | |
293 | driver_deferred_probe_trigger(); | |
294 | flush_work(&deferred_probe_work); | |
295 | ||
296 | if (deferred_probe_timeout > 0) { | |
297 | schedule_delayed_work(&deferred_probe_timeout_work, | |
298 | deferred_probe_timeout * HZ); | |
299 | } | |
d1c3414c GL |
300 | return 0; |
301 | } | |
302 | late_initcall(deferred_probe_initcall); | |
07e4a3e2 | 303 | |
28af109a JMC |
304 | static void __exit deferred_probe_exit(void) |
305 | { | |
306 | debugfs_remove_recursive(deferred_devices); | |
307 | } | |
308 | __exitcall(deferred_probe_exit); | |
309 | ||
6b9cb427 TV |
310 | /** |
311 | * device_is_bound() - Check if device is bound to a driver | |
312 | * @dev: device to check | |
313 | * | |
314 | * Returns true if passed device has already finished probing successfully | |
315 | * against a driver. | |
316 | * | |
317 | * This function must be called with the device lock held. | |
318 | */ | |
319 | bool device_is_bound(struct device *dev) | |
320 | { | |
3ded9104 | 321 | return dev->p && klist_node_attached(&dev->p->knode_driver); |
6b9cb427 TV |
322 | } |
323 | ||
1901fb26 | 324 | static void driver_bound(struct device *dev) |
07e4a3e2 | 325 | { |
6b9cb427 | 326 | if (device_is_bound(dev)) { |
f86db396 | 327 | printk(KERN_WARNING "%s: device %s already bound\n", |
2b3a302a | 328 | __func__, kobject_name(&dev->kobj)); |
1901fb26 | 329 | return; |
f86db396 | 330 | } |
4c898c7f | 331 | |
94f8cc0e FR |
332 | pr_debug("driver: '%s': %s: bound to device '%s'\n", dev->driver->name, |
333 | __func__, dev_name(dev)); | |
116af378 | 334 | |
fbb88fad | 335 | klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices); |
9ed98953 | 336 | device_links_driver_bound(dev); |
fbb88fad | 337 | |
aa8e54b5 TV |
338 | device_pm_check_callbacks(dev); |
339 | ||
8b0372a2 GKH |
340 | /* |
341 | * Make sure the device is no longer in one of the deferred lists and | |
342 | * kick off retrying all pending devices | |
343 | */ | |
d1c3414c GL |
344 | driver_deferred_probe_del(dev); |
345 | driver_deferred_probe_trigger(); | |
346 | ||
116af378 | 347 | if (dev->bus) |
c6f7e72a | 348 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 349 | BUS_NOTIFY_BOUND_DRIVER, dev); |
1455cf8d DT |
350 | |
351 | kobject_uevent(&dev->kobj, KOBJ_BIND); | |
1901fb26 KS |
352 | } |
353 | ||
3c47d19f AS |
354 | static ssize_t coredump_store(struct device *dev, struct device_attribute *attr, |
355 | const char *buf, size_t count) | |
356 | { | |
357 | device_lock(dev); | |
1fe56e0c | 358 | dev->driver->coredump(dev); |
3c47d19f AS |
359 | device_unlock(dev); |
360 | ||
361 | return count; | |
362 | } | |
363 | static DEVICE_ATTR_WO(coredump); | |
364 | ||
1901fb26 KS |
365 | static int driver_sysfs_add(struct device *dev) |
366 | { | |
367 | int ret; | |
368 | ||
45daef0f MD |
369 | if (dev->bus) |
370 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
371 | BUS_NOTIFY_BIND_DRIVER, dev); | |
372 | ||
e5dd1278 | 373 | ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj, |
3c47d19f AS |
374 | kobject_name(&dev->kobj)); |
375 | if (ret) | |
376 | goto fail; | |
377 | ||
378 | ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj, | |
379 | "driver"); | |
380 | if (ret) | |
381 | goto rm_dev; | |
382 | ||
383 | if (!IS_ENABLED(CONFIG_DEV_COREDUMP) || !dev->driver->coredump || | |
384 | !device_create_file(dev, &dev_attr_coredump)) | |
385 | return 0; | |
386 | ||
387 | sysfs_remove_link(&dev->kobj, "driver"); | |
388 | ||
389 | rm_dev: | |
390 | sysfs_remove_link(&dev->driver->p->kobj, | |
07e4a3e2 | 391 | kobject_name(&dev->kobj)); |
3c47d19f AS |
392 | |
393 | fail: | |
f86db396 | 394 | return ret; |
07e4a3e2 PM |
395 | } |
396 | ||
1901fb26 KS |
397 | static void driver_sysfs_remove(struct device *dev) |
398 | { | |
399 | struct device_driver *drv = dev->driver; | |
400 | ||
401 | if (drv) { | |
3c47d19f AS |
402 | if (drv->coredump) |
403 | device_remove_file(dev, &dev_attr_coredump); | |
e5dd1278 | 404 | sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj)); |
1901fb26 KS |
405 | sysfs_remove_link(&dev->kobj, "driver"); |
406 | } | |
407 | } | |
408 | ||
409 | /** | |
4a3ad20c GKH |
410 | * device_bind_driver - bind a driver to one device. |
411 | * @dev: device. | |
1901fb26 | 412 | * |
4a3ad20c GKH |
413 | * Allow manual attachment of a driver to a device. |
414 | * Caller must have already set @dev->driver. | |
1901fb26 | 415 | * |
4a3ad20c GKH |
416 | * Note that this does not modify the bus reference count |
417 | * nor take the bus's rwsem. Please verify those are accounted | |
418 | * for before calling this. (It is ok to call with no other effort | |
419 | * from a driver's probe() method.) | |
1901fb26 | 420 | * |
8e9394ce | 421 | * This function must be called with the device lock held. |
1901fb26 KS |
422 | */ |
423 | int device_bind_driver(struct device *dev) | |
424 | { | |
cb986b74 CH |
425 | int ret; |
426 | ||
427 | ret = driver_sysfs_add(dev); | |
428 | if (!ret) | |
429 | driver_bound(dev); | |
14b6257a AS |
430 | else if (dev->bus) |
431 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
432 | BUS_NOTIFY_DRIVER_NOT_BOUND, dev); | |
cb986b74 | 433 | return ret; |
1901fb26 | 434 | } |
4a3ad20c | 435 | EXPORT_SYMBOL_GPL(device_bind_driver); |
1901fb26 | 436 | |
d779249e | 437 | static atomic_t probe_count = ATOMIC_INIT(0); |
735a7ffb AM |
438 | static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue); |
439 | ||
0ff26c66 AH |
440 | static void driver_deferred_probe_add_trigger(struct device *dev, |
441 | int local_trigger_count) | |
442 | { | |
443 | driver_deferred_probe_add(dev); | |
444 | /* Did a trigger occur while probing? Need to re-trigger if yes */ | |
445 | if (local_trigger_count != atomic_read(&deferred_trigger_count)) | |
446 | driver_deferred_probe_trigger(); | |
447 | } | |
448 | ||
21c7f30b | 449 | static int really_probe(struct device *dev, struct device_driver *drv) |
07e4a3e2 | 450 | { |
013c074f | 451 | int ret = -EPROBE_DEFER; |
58b116bc | 452 | int local_trigger_count = atomic_read(&deferred_trigger_count); |
c5f06274 RH |
453 | bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) && |
454 | !drv->suppress_bind_attrs; | |
07e4a3e2 | 455 | |
013c074f SG |
456 | if (defer_all_probes) { |
457 | /* | |
458 | * Value of defer_all_probes can be set only by | |
dbf03d65 | 459 | * device_block_probing() which, in turn, will call |
013c074f SG |
460 | * wait_for_device_probe() right after that to avoid any races. |
461 | */ | |
462 | dev_dbg(dev, "Driver %s force probe deferral\n", drv->name); | |
463 | driver_deferred_probe_add(dev); | |
464 | return ret; | |
465 | } | |
466 | ||
9ed98953 | 467 | ret = device_links_check_suppliers(dev); |
0ff26c66 AH |
468 | if (ret == -EPROBE_DEFER) |
469 | driver_deferred_probe_add_trigger(dev, local_trigger_count); | |
9ed98953 RW |
470 | if (ret) |
471 | return ret; | |
472 | ||
d779249e | 473 | atomic_inc(&probe_count); |
7dc72b28 | 474 | pr_debug("bus: '%s': %s: probing driver %s with device %s\n", |
1e0b2cf9 | 475 | drv->bus->name, __func__, drv->name, dev_name(dev)); |
9ac7849e | 476 | WARN_ON(!list_empty(&dev->devres_head)); |
07e4a3e2 | 477 | |
bea5b158 | 478 | re_probe: |
07e4a3e2 | 479 | dev->driver = drv; |
ab78029e LW |
480 | |
481 | /* If using pinctrl, bind pins now before probing */ | |
482 | ret = pinctrl_bind_pins(dev); | |
483 | if (ret) | |
14b6257a | 484 | goto pinctrl_bind_failed; |
ab78029e | 485 | |
ccf640f4 CH |
486 | if (dev->bus->dma_configure) { |
487 | ret = dev->bus->dma_configure(dev); | |
488 | if (ret) | |
489 | goto dma_failed; | |
490 | } | |
09515ef5 | 491 | |
1901fb26 KS |
492 | if (driver_sysfs_add(dev)) { |
493 | printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n", | |
1e0b2cf9 | 494 | __func__, dev_name(dev)); |
1901fb26 KS |
495 | goto probe_failed; |
496 | } | |
497 | ||
e90d5532 RW |
498 | if (dev->pm_domain && dev->pm_domain->activate) { |
499 | ret = dev->pm_domain->activate(dev); | |
500 | if (ret) | |
501 | goto probe_failed; | |
502 | } | |
503 | ||
594c8281 RK |
504 | if (dev->bus->probe) { |
505 | ret = dev->bus->probe(dev); | |
1901fb26 | 506 | if (ret) |
d779249e | 507 | goto probe_failed; |
594c8281 | 508 | } else if (drv->probe) { |
0d3e5a2e | 509 | ret = drv->probe(dev); |
1901fb26 | 510 | if (ret) |
d779249e | 511 | goto probe_failed; |
f86db396 | 512 | } |
1901fb26 | 513 | |
bea5b158 RH |
514 | if (test_remove) { |
515 | test_remove = false; | |
516 | ||
bdacd1b4 | 517 | if (dev->bus->remove) |
bea5b158 RH |
518 | dev->bus->remove(dev); |
519 | else if (drv->remove) | |
520 | drv->remove(dev); | |
521 | ||
522 | devres_release_all(dev); | |
523 | driver_sysfs_remove(dev); | |
524 | dev->driver = NULL; | |
525 | dev_set_drvdata(dev, NULL); | |
526 | if (dev->pm_domain && dev->pm_domain->dismiss) | |
527 | dev->pm_domain->dismiss(dev); | |
528 | pm_runtime_reinit(dev); | |
529 | ||
530 | goto re_probe; | |
531 | } | |
532 | ||
ef0eebc0 DA |
533 | pinctrl_init_done(dev); |
534 | ||
e90d5532 RW |
535 | if (dev->pm_domain && dev->pm_domain->sync) |
536 | dev->pm_domain->sync(dev); | |
537 | ||
1901fb26 | 538 | driver_bound(dev); |
0d3e5a2e | 539 | ret = 1; |
7dc72b28 | 540 | pr_debug("bus: '%s': %s: bound device %s to driver %s\n", |
1e0b2cf9 | 541 | drv->bus->name, __func__, dev_name(dev), drv->name); |
d779249e | 542 | goto done; |
0d3e5a2e | 543 | |
d779249e | 544 | probe_failed: |
dc3c0550 | 545 | arch_teardown_dma_ops(dev); |
09515ef5 | 546 | dma_failed: |
14b6257a AS |
547 | if (dev->bus) |
548 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
549 | BUS_NOTIFY_DRIVER_NOT_BOUND, dev); | |
550 | pinctrl_bind_failed: | |
9ed98953 | 551 | device_links_no_driver(dev); |
9ac7849e | 552 | devres_release_all(dev); |
1901fb26 KS |
553 | driver_sysfs_remove(dev); |
554 | dev->driver = NULL; | |
0998d063 | 555 | dev_set_drvdata(dev, NULL); |
e90d5532 RW |
556 | if (dev->pm_domain && dev->pm_domain->dismiss) |
557 | dev->pm_domain->dismiss(dev); | |
5de85b9d | 558 | pm_runtime_reinit(dev); |
08810a41 | 559 | dev_pm_set_driver_flags(dev, 0); |
1901fb26 | 560 | |
bb2b4075 SS |
561 | switch (ret) { |
562 | case -EPROBE_DEFER: | |
d1c3414c | 563 | /* Driver requested deferred probing */ |
13fcffbb | 564 | dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name); |
0ff26c66 | 565 | driver_deferred_probe_add_trigger(dev, local_trigger_count); |
bb2b4075 SS |
566 | break; |
567 | case -ENODEV: | |
568 | case -ENXIO: | |
569 | pr_debug("%s: probe of %s rejects match %d\n", | |
570 | drv->name, dev_name(dev), ret); | |
571 | break; | |
572 | default: | |
0d3e5a2e PM |
573 | /* driver matched but the probe failed */ |
574 | printk(KERN_WARNING | |
575 | "%s: probe of %s failed with error %d\n", | |
1e0b2cf9 | 576 | drv->name, dev_name(dev), ret); |
0d3e5a2e | 577 | } |
c578abbc CH |
578 | /* |
579 | * Ignore errors returned by ->probe so that the next driver can try | |
580 | * its luck. | |
581 | */ | |
582 | ret = 0; | |
d779249e | 583 | done: |
d779249e | 584 | atomic_dec(&probe_count); |
735a7ffb | 585 | wake_up(&probe_waitqueue); |
d779249e GKH |
586 | return ret; |
587 | } | |
588 | ||
0a50f61c TP |
589 | /* |
590 | * For initcall_debug, show the driver probe time. | |
591 | */ | |
592 | static int really_probe_debug(struct device *dev, struct device_driver *drv) | |
593 | { | |
594 | ktime_t calltime, delta, rettime; | |
595 | int ret; | |
596 | ||
597 | calltime = ktime_get(); | |
598 | ret = really_probe(dev, drv); | |
599 | rettime = ktime_get(); | |
600 | delta = ktime_sub(rettime, calltime); | |
601 | printk(KERN_DEBUG "probe of %s returned %d after %lld usecs\n", | |
602 | dev_name(dev), ret, (s64) ktime_to_us(delta)); | |
603 | return ret; | |
604 | } | |
605 | ||
d779249e GKH |
606 | /** |
607 | * driver_probe_done | |
608 | * Determine if the probe sequence is finished or not. | |
609 | * | |
610 | * Should somehow figure out how to use a semaphore, not an atomic variable... | |
611 | */ | |
612 | int driver_probe_done(void) | |
613 | { | |
2b3a302a | 614 | pr_debug("%s: probe_count = %d\n", __func__, |
d779249e GKH |
615 | atomic_read(&probe_count)); |
616 | if (atomic_read(&probe_count)) | |
617 | return -EBUSY; | |
618 | return 0; | |
619 | } | |
620 | ||
216773a7 AV |
621 | /** |
622 | * wait_for_device_probe | |
623 | * Wait for device probing to be completed. | |
216773a7 | 624 | */ |
b23530eb | 625 | void wait_for_device_probe(void) |
216773a7 | 626 | { |
013c074f | 627 | /* wait for the deferred probe workqueue to finish */ |
2c507e46 | 628 | flush_work(&deferred_probe_work); |
013c074f | 629 | |
216773a7 | 630 | /* wait for the known devices to complete their probing */ |
b23530eb | 631 | wait_event(probe_waitqueue, atomic_read(&probe_count) == 0); |
216773a7 | 632 | async_synchronize_full(); |
216773a7 | 633 | } |
d4d5291c | 634 | EXPORT_SYMBOL_GPL(wait_for_device_probe); |
216773a7 | 635 | |
d779249e GKH |
636 | /** |
637 | * driver_probe_device - attempt to bind device & driver together | |
638 | * @drv: driver to bind a device to | |
639 | * @dev: device to try to bind to the driver | |
640 | * | |
49b420a1 | 641 | * This function returns -ENODEV if the device is not registered, |
af901ca1 | 642 | * 1 if the device is bound successfully and 0 otherwise. |
d779249e | 643 | * |
8e9394ce GKH |
644 | * This function must be called with @dev lock held. When called for a |
645 | * USB interface, @dev->parent lock must be held as well. | |
ddef08dd RW |
646 | * |
647 | * If the device has a parent, runtime-resume the parent before driver probing. | |
d779249e | 648 | */ |
4a3ad20c | 649 | int driver_probe_device(struct device_driver *drv, struct device *dev) |
d779249e | 650 | { |
d779249e GKH |
651 | int ret = 0; |
652 | ||
f2eaae19 AS |
653 | if (!device_is_registered(dev)) |
654 | return -ENODEV; | |
d779249e | 655 | |
7dc72b28 | 656 | pr_debug("bus: '%s': %s: matched device %s with driver %s\n", |
1e0b2cf9 | 657 | drv->bus->name, __func__, dev_name(dev), drv->name); |
d779249e | 658 | |
b06c0b2f | 659 | pm_runtime_get_suppliers(dev); |
ddef08dd RW |
660 | if (dev->parent) |
661 | pm_runtime_get_sync(dev->parent); | |
662 | ||
5e928f77 | 663 | pm_runtime_barrier(dev); |
0a50f61c TP |
664 | if (initcall_debug) |
665 | ret = really_probe_debug(dev, drv); | |
666 | else | |
667 | ret = really_probe(dev, drv); | |
fa180eb4 | 668 | pm_request_idle(dev); |
d779249e | 669 | |
ddef08dd RW |
670 | if (dev->parent) |
671 | pm_runtime_put(dev->parent); | |
672 | ||
b06c0b2f | 673 | pm_runtime_put_suppliers(dev); |
0d3e5a2e | 674 | return ret; |
07e4a3e2 PM |
675 | } |
676 | ||
765230b5 | 677 | bool driver_allows_async_probing(struct device_driver *drv) |
2287c322 | 678 | { |
d173a137 LR |
679 | switch (drv->probe_type) { |
680 | case PROBE_PREFER_ASYNCHRONOUS: | |
f2411da7 LR |
681 | return true; |
682 | ||
d173a137 LR |
683 | case PROBE_FORCE_SYNCHRONOUS: |
684 | return false; | |
685 | ||
686 | default: | |
80c6e146 | 687 | if (module_requested_async_probing(drv->owner)) |
d173a137 | 688 | return true; |
f2411da7 | 689 | |
d173a137 LR |
690 | return false; |
691 | } | |
765230b5 DT |
692 | } |
693 | ||
694 | struct device_attach_data { | |
695 | struct device *dev; | |
696 | ||
697 | /* | |
698 | * Indicates whether we are are considering asynchronous probing or | |
699 | * not. Only initial binding after device or driver registration | |
700 | * (including deferral processing) may be done asynchronously, the | |
701 | * rest is always synchronous, as we expect it is being done by | |
702 | * request from userspace. | |
703 | */ | |
704 | bool check_async; | |
705 | ||
706 | /* | |
707 | * Indicates if we are binding synchronous or asynchronous drivers. | |
708 | * When asynchronous probing is enabled we'll execute 2 passes | |
709 | * over drivers: first pass doing synchronous probing and second | |
710 | * doing asynchronous probing (if synchronous did not succeed - | |
711 | * most likely because there was no driver requiring synchronous | |
712 | * probing - and we found asynchronous driver during first pass). | |
713 | * The 2 passes are done because we can't shoot asynchronous | |
714 | * probe for given device and driver from bus_for_each_drv() since | |
715 | * driver pointer is not guaranteed to stay valid once | |
716 | * bus_for_each_drv() iterates to the next driver on the bus. | |
717 | */ | |
718 | bool want_async; | |
719 | ||
720 | /* | |
721 | * We'll set have_async to 'true' if, while scanning for matching | |
722 | * driver, we'll encounter one that requests asynchronous probing. | |
723 | */ | |
724 | bool have_async; | |
725 | }; | |
726 | ||
727 | static int __device_attach_driver(struct device_driver *drv, void *_data) | |
728 | { | |
729 | struct device_attach_data *data = _data; | |
730 | struct device *dev = data->dev; | |
731 | bool async_allowed; | |
656b8035 | 732 | int ret; |
765230b5 | 733 | |
656b8035 TV |
734 | ret = driver_match_device(drv, dev); |
735 | if (ret == 0) { | |
736 | /* no match */ | |
49b420a1 | 737 | return 0; |
656b8035 TV |
738 | } else if (ret == -EPROBE_DEFER) { |
739 | dev_dbg(dev, "Device match requests probe deferral\n"); | |
740 | driver_deferred_probe_add(dev); | |
741 | } else if (ret < 0) { | |
742 | dev_dbg(dev, "Bus failed to match device: %d", ret); | |
743 | return ret; | |
744 | } /* ret > 0 means positive match */ | |
49b420a1 | 745 | |
765230b5 DT |
746 | async_allowed = driver_allows_async_probing(drv); |
747 | ||
748 | if (async_allowed) | |
749 | data->have_async = true; | |
750 | ||
751 | if (data->check_async && async_allowed != data->want_async) | |
752 | return 0; | |
753 | ||
0d3e5a2e | 754 | return driver_probe_device(drv, dev); |
2287c322 PM |
755 | } |
756 | ||
765230b5 DT |
757 | static void __device_attach_async_helper(void *_dev, async_cookie_t cookie) |
758 | { | |
759 | struct device *dev = _dev; | |
760 | struct device_attach_data data = { | |
761 | .dev = dev, | |
762 | .check_async = true, | |
763 | .want_async = true, | |
764 | }; | |
765 | ||
766 | device_lock(dev); | |
767 | ||
3451a495 AD |
768 | /* |
769 | * Check if device has already been removed or claimed. This may | |
770 | * happen with driver loading, device discovery/registration, | |
771 | * and deferred probe processing happens all at once with | |
772 | * multiple threads. | |
773 | */ | |
774 | if (dev->p->dead || dev->driver) | |
775 | goto out_unlock; | |
776 | ||
ddef08dd RW |
777 | if (dev->parent) |
778 | pm_runtime_get_sync(dev->parent); | |
779 | ||
765230b5 DT |
780 | bus_for_each_drv(dev->bus, NULL, &data, __device_attach_driver); |
781 | dev_dbg(dev, "async probe completed\n"); | |
782 | ||
783 | pm_request_idle(dev); | |
784 | ||
ddef08dd RW |
785 | if (dev->parent) |
786 | pm_runtime_put(dev->parent); | |
3451a495 | 787 | out_unlock: |
765230b5 DT |
788 | device_unlock(dev); |
789 | ||
790 | put_device(dev); | |
791 | } | |
792 | ||
802a87fd | 793 | static int __device_attach(struct device *dev, bool allow_async) |
07e4a3e2 | 794 | { |
0d3e5a2e PM |
795 | int ret = 0; |
796 | ||
8e9394ce | 797 | device_lock(dev); |
07e4a3e2 | 798 | if (dev->driver) { |
6b9cb427 | 799 | if (device_is_bound(dev)) { |
8497d6a2 SO |
800 | ret = 1; |
801 | goto out_unlock; | |
802 | } | |
f86db396 AM |
803 | ret = device_bind_driver(dev); |
804 | if (ret == 0) | |
805 | ret = 1; | |
c6a46696 CH |
806 | else { |
807 | dev->driver = NULL; | |
808 | ret = 0; | |
809 | } | |
21c7f30b | 810 | } else { |
765230b5 DT |
811 | struct device_attach_data data = { |
812 | .dev = dev, | |
813 | .check_async = allow_async, | |
814 | .want_async = false, | |
815 | }; | |
816 | ||
ddef08dd RW |
817 | if (dev->parent) |
818 | pm_runtime_get_sync(dev->parent); | |
819 | ||
765230b5 DT |
820 | ret = bus_for_each_drv(dev->bus, NULL, &data, |
821 | __device_attach_driver); | |
822 | if (!ret && allow_async && data.have_async) { | |
823 | /* | |
824 | * If we could not find appropriate driver | |
825 | * synchronously and we are allowed to do | |
826 | * async probes and there are drivers that | |
827 | * want to probe asynchronously, we'll | |
828 | * try them. | |
829 | */ | |
830 | dev_dbg(dev, "scheduling asynchronous probe\n"); | |
831 | get_device(dev); | |
c37e20ea | 832 | async_schedule_dev(__device_attach_async_helper, dev); |
765230b5 DT |
833 | } else { |
834 | pm_request_idle(dev); | |
835 | } | |
ddef08dd RW |
836 | |
837 | if (dev->parent) | |
838 | pm_runtime_put(dev->parent); | |
21c7f30b | 839 | } |
8497d6a2 | 840 | out_unlock: |
8e9394ce | 841 | device_unlock(dev); |
0d3e5a2e | 842 | return ret; |
2287c322 | 843 | } |
765230b5 DT |
844 | |
845 | /** | |
846 | * device_attach - try to attach device to a driver. | |
847 | * @dev: device. | |
848 | * | |
849 | * Walk the list of drivers that the bus has and call | |
850 | * driver_probe_device() for each pair. If a compatible | |
851 | * pair is found, break out and return. | |
852 | * | |
853 | * Returns 1 if the device was bound to a driver; | |
854 | * 0 if no matching driver was found; | |
855 | * -ENODEV if the device is not registered. | |
856 | * | |
857 | * When called for a USB interface, @dev->parent lock must be held. | |
858 | */ | |
859 | int device_attach(struct device *dev) | |
860 | { | |
861 | return __device_attach(dev, false); | |
862 | } | |
4a3ad20c | 863 | EXPORT_SYMBOL_GPL(device_attach); |
2287c322 | 864 | |
765230b5 DT |
865 | void device_initial_probe(struct device *dev) |
866 | { | |
867 | __device_attach(dev, true); | |
868 | } | |
869 | ||
ed88747c AD |
870 | /* |
871 | * __device_driver_lock - acquire locks needed to manipulate dev->drv | |
872 | * @dev: Device we will update driver info for | |
873 | * @parent: Parent device. Needed if the bus requires parent lock | |
874 | * | |
875 | * This function will take the required locks for manipulating dev->drv. | |
876 | * Normally this will just be the @dev lock, but when called for a USB | |
877 | * interface, @parent lock will be held as well. | |
878 | */ | |
879 | static void __device_driver_lock(struct device *dev, struct device *parent) | |
880 | { | |
881 | if (parent && dev->bus->need_parent_lock) | |
882 | device_lock(parent); | |
883 | device_lock(dev); | |
884 | } | |
885 | ||
886 | /* | |
887 | * __device_driver_unlock - release locks needed to manipulate dev->drv | |
888 | * @dev: Device we will update driver info for | |
889 | * @parent: Parent device. Needed if the bus requires parent lock | |
890 | * | |
891 | * This function will release the required locks for manipulating dev->drv. | |
892 | * Normally this will just be the the @dev lock, but when called for a | |
893 | * USB interface, @parent lock will be released as well. | |
894 | */ | |
895 | static void __device_driver_unlock(struct device *dev, struct device *parent) | |
896 | { | |
897 | device_unlock(dev); | |
898 | if (parent && dev->bus->need_parent_lock) | |
899 | device_unlock(parent); | |
900 | } | |
901 | ||
902 | /** | |
903 | * device_driver_attach - attach a specific driver to a specific device | |
904 | * @drv: Driver to attach | |
905 | * @dev: Device to attach it to | |
906 | * | |
907 | * Manually attach driver to a device. Will acquire both @dev lock and | |
908 | * @dev->parent lock if needed. | |
909 | */ | |
910 | int device_driver_attach(struct device_driver *drv, struct device *dev) | |
911 | { | |
912 | int ret = 0; | |
913 | ||
914 | __device_driver_lock(dev, dev->parent); | |
915 | ||
916 | /* | |
917 | * If device has been removed or someone has already successfully | |
918 | * bound a driver before us just skip the driver probe call. | |
919 | */ | |
920 | if (!dev->p->dead && !dev->driver) | |
921 | ret = driver_probe_device(drv, dev); | |
922 | ||
923 | __device_driver_unlock(dev, dev->parent); | |
924 | ||
925 | return ret; | |
926 | } | |
927 | ||
ef0ff683 AD |
928 | static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie) |
929 | { | |
930 | struct device *dev = _dev; | |
931 | struct device_driver *drv; | |
932 | int ret = 0; | |
933 | ||
934 | __device_driver_lock(dev, dev->parent); | |
935 | ||
936 | drv = dev->p->async_driver; | |
937 | ||
938 | /* | |
939 | * If device has been removed or someone has already successfully | |
940 | * bound a driver before us just skip the driver probe call. | |
941 | */ | |
942 | if (!dev->p->dead && !dev->driver) | |
943 | ret = driver_probe_device(drv, dev); | |
944 | ||
945 | __device_driver_unlock(dev, dev->parent); | |
946 | ||
947 | dev_dbg(dev, "driver %s async attach completed: %d\n", drv->name, ret); | |
948 | ||
949 | put_device(dev); | |
950 | } | |
951 | ||
4a3ad20c | 952 | static int __driver_attach(struct device *dev, void *data) |
2287c322 | 953 | { |
4a3ad20c | 954 | struct device_driver *drv = data; |
656b8035 | 955 | int ret; |
0d3e5a2e PM |
956 | |
957 | /* | |
958 | * Lock device and try to bind to it. We drop the error | |
959 | * here and always return 0, because we need to keep trying | |
960 | * to bind to devices and some drivers will return an error | |
961 | * simply if it didn't support the device. | |
962 | * | |
963 | * driver_probe_device() will spit a warning if there | |
964 | * is an error. | |
965 | */ | |
966 | ||
656b8035 TV |
967 | ret = driver_match_device(drv, dev); |
968 | if (ret == 0) { | |
969 | /* no match */ | |
6cd49586 | 970 | return 0; |
656b8035 TV |
971 | } else if (ret == -EPROBE_DEFER) { |
972 | dev_dbg(dev, "Device match requests probe deferral\n"); | |
973 | driver_deferred_probe_add(dev); | |
974 | } else if (ret < 0) { | |
975 | dev_dbg(dev, "Bus failed to match device: %d", ret); | |
976 | return ret; | |
977 | } /* ret > 0 means positive match */ | |
6cd49586 | 978 | |
ef0ff683 AD |
979 | if (driver_allows_async_probing(drv)) { |
980 | /* | |
981 | * Instead of probing the device synchronously we will | |
982 | * probe it asynchronously to allow for more parallelism. | |
983 | * | |
984 | * We only take the device lock here in order to guarantee | |
985 | * that the dev->driver and async_driver fields are protected | |
986 | */ | |
987 | dev_dbg(dev, "probing driver %s asynchronously\n", drv->name); | |
988 | device_lock(dev); | |
989 | if (!dev->driver) { | |
990 | get_device(dev); | |
991 | dev->p->async_driver = drv; | |
c37e20ea | 992 | async_schedule_dev(__driver_attach_async_helper, dev); |
ef0ff683 AD |
993 | } |
994 | device_unlock(dev); | |
995 | return 0; | |
996 | } | |
997 | ||
ed88747c | 998 | device_driver_attach(drv, dev); |
0d3e5a2e | 999 | |
07e4a3e2 PM |
1000 | return 0; |
1001 | } | |
1002 | ||
1003 | /** | |
4a3ad20c GKH |
1004 | * driver_attach - try to bind driver to devices. |
1005 | * @drv: driver. | |
07e4a3e2 | 1006 | * |
4a3ad20c GKH |
1007 | * Walk the list of devices that the bus has on it and try to |
1008 | * match the driver with each one. If driver_probe_device() | |
1009 | * returns 0 and the @dev->driver is set, we've found a | |
1010 | * compatible pair. | |
07e4a3e2 | 1011 | */ |
4a3ad20c | 1012 | int driver_attach(struct device_driver *drv) |
07e4a3e2 | 1013 | { |
f86db396 | 1014 | return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach); |
07e4a3e2 | 1015 | } |
4a3ad20c | 1016 | EXPORT_SYMBOL_GPL(driver_attach); |
07e4a3e2 | 1017 | |
ab71c6f0 | 1018 | /* |
8e9394ce GKH |
1019 | * __device_release_driver() must be called with @dev lock held. |
1020 | * When called for a USB interface, @dev->parent lock must be held as well. | |
07e4a3e2 | 1021 | */ |
9ed98953 | 1022 | static void __device_release_driver(struct device *dev, struct device *parent) |
07e4a3e2 | 1023 | { |
4a3ad20c | 1024 | struct device_driver *drv; |
07e4a3e2 | 1025 | |
ef2c5174 | 1026 | drv = dev->driver; |
c95a6b05 | 1027 | if (drv) { |
9ed98953 | 1028 | while (device_links_busy(dev)) { |
ed88747c | 1029 | __device_driver_unlock(dev, parent); |
9ed98953 RW |
1030 | |
1031 | device_links_unbind_consumers(dev); | |
9ed98953 | 1032 | |
ed88747c | 1033 | __device_driver_lock(dev, parent); |
9ed98953 RW |
1034 | /* |
1035 | * A concurrent invocation of the same function might | |
1036 | * have released the driver successfully while this one | |
1037 | * was waiting, so check for that. | |
1038 | */ | |
1039 | if (dev->driver != drv) | |
1040 | return; | |
1041 | } | |
1042 | ||
e1866b33 | 1043 | pm_runtime_get_sync(dev); |
21d5c57b | 1044 | pm_runtime_clean_up_links(dev); |
5e928f77 | 1045 | |
1901fb26 | 1046 | driver_sysfs_remove(dev); |
0d3e5a2e | 1047 | |
116af378 | 1048 | if (dev->bus) |
c6f7e72a | 1049 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
1050 | BUS_NOTIFY_UNBIND_DRIVER, |
1051 | dev); | |
1052 | ||
baab52de | 1053 | pm_runtime_put_sync(dev); |
e1866b33 | 1054 | |
0f836ca4 | 1055 | if (dev->bus && dev->bus->remove) |
594c8281 RK |
1056 | dev->bus->remove(dev); |
1057 | else if (drv->remove) | |
0d3e5a2e | 1058 | drv->remove(dev); |
9ed98953 RW |
1059 | |
1060 | device_links_driver_cleanup(dev); | |
dc3c0550 | 1061 | arch_teardown_dma_ops(dev); |
09515ef5 | 1062 | |
9ac7849e | 1063 | devres_release_all(dev); |
0d3e5a2e | 1064 | dev->driver = NULL; |
0998d063 | 1065 | dev_set_drvdata(dev, NULL); |
e90d5532 RW |
1066 | if (dev->pm_domain && dev->pm_domain->dismiss) |
1067 | dev->pm_domain->dismiss(dev); | |
5de85b9d | 1068 | pm_runtime_reinit(dev); |
08810a41 | 1069 | dev_pm_set_driver_flags(dev, 0); |
e90d5532 | 1070 | |
8940b4f3 | 1071 | klist_remove(&dev->p->knode_driver); |
aa8e54b5 | 1072 | device_pm_check_callbacks(dev); |
309b7d60 JR |
1073 | if (dev->bus) |
1074 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1075 | BUS_NOTIFY_UNBOUND_DRIVER, | |
1076 | dev); | |
1455cf8d DT |
1077 | |
1078 | kobject_uevent(&dev->kobj, KOBJ_UNBIND); | |
0d3e5a2e | 1079 | } |
07e4a3e2 PM |
1080 | } |
1081 | ||
9ed98953 RW |
1082 | void device_release_driver_internal(struct device *dev, |
1083 | struct device_driver *drv, | |
1084 | struct device *parent) | |
4bdb3550 | 1085 | { |
ed88747c | 1086 | __device_driver_lock(dev, parent); |
4bdb3550 | 1087 | |
4bdb3550 | 1088 | if (!drv || drv == dev->driver) |
9ed98953 | 1089 | __device_release_driver(dev, parent); |
4bdb3550 | 1090 | |
ed88747c | 1091 | __device_driver_unlock(dev, parent); |
4bdb3550 RW |
1092 | } |
1093 | ||
ab71c6f0 | 1094 | /** |
4a3ad20c GKH |
1095 | * device_release_driver - manually detach device from driver. |
1096 | * @dev: device. | |
ab71c6f0 | 1097 | * |
4a3ad20c | 1098 | * Manually detach device from driver. |
8e9394ce | 1099 | * When called for a USB interface, @dev->parent lock must be held. |
9ed98953 RW |
1100 | * |
1101 | * If this function is to be called with @dev->parent lock held, ensure that | |
1102 | * the device's consumers are unbound in advance or that their locks can be | |
1103 | * acquired under the @dev->parent lock. | |
ab71c6f0 | 1104 | */ |
4a3ad20c | 1105 | void device_release_driver(struct device *dev) |
94e7b1c5 | 1106 | { |
c95a6b05 AS |
1107 | /* |
1108 | * If anyone calls device_release_driver() recursively from | |
1109 | * within their ->remove callback for the same device, they | |
1110 | * will deadlock right here. | |
1111 | */ | |
4bdb3550 | 1112 | device_release_driver_internal(dev, NULL, NULL); |
94e7b1c5 | 1113 | } |
4a3ad20c | 1114 | EXPORT_SYMBOL_GPL(device_release_driver); |
c95a6b05 | 1115 | |
ed88747c AD |
1116 | /** |
1117 | * device_driver_detach - detach driver from a specific device | |
1118 | * @dev: device to detach driver from | |
1119 | * | |
1120 | * Detach driver from device. Will acquire both @dev lock and @dev->parent | |
1121 | * lock if needed. | |
1122 | */ | |
1123 | void device_driver_detach(struct device *dev) | |
1124 | { | |
1125 | device_release_driver_internal(dev, NULL, dev->parent); | |
1126 | } | |
1127 | ||
07e4a3e2 PM |
1128 | /** |
1129 | * driver_detach - detach driver from all devices it controls. | |
1130 | * @drv: driver. | |
1131 | */ | |
4a3ad20c | 1132 | void driver_detach(struct device_driver *drv) |
07e4a3e2 | 1133 | { |
8940b4f3 | 1134 | struct device_private *dev_prv; |
4a3ad20c | 1135 | struct device *dev; |
c95a6b05 | 1136 | |
c37d721c AD |
1137 | if (driver_allows_async_probing(drv)) |
1138 | async_synchronize_full(); | |
1139 | ||
c95a6b05 | 1140 | for (;;) { |
e5dd1278 GKH |
1141 | spin_lock(&drv->p->klist_devices.k_lock); |
1142 | if (list_empty(&drv->p->klist_devices.k_list)) { | |
1143 | spin_unlock(&drv->p->klist_devices.k_lock); | |
c95a6b05 AS |
1144 | break; |
1145 | } | |
8940b4f3 GKH |
1146 | dev_prv = list_entry(drv->p->klist_devices.k_list.prev, |
1147 | struct device_private, | |
1148 | knode_driver.n_node); | |
1149 | dev = dev_prv->device; | |
c95a6b05 | 1150 | get_device(dev); |
e5dd1278 | 1151 | spin_unlock(&drv->p->klist_devices.k_lock); |
4bdb3550 | 1152 | device_release_driver_internal(dev, drv, dev->parent); |
c95a6b05 AS |
1153 | put_device(dev); |
1154 | } | |
07e4a3e2 | 1155 | } |