| 1 | /* |
| 2 | * drivers/base/dd.c - The core device/driver interactions. |
| 3 | * |
| 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. |
| 7 | * |
| 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'. |
| 11 | * |
| 12 | * Copyright (c) 2002-5 Patrick Mochel |
| 13 | * Copyright (c) 2002-3 Open Source Development Labs |
| 14 | * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de> |
| 15 | * Copyright (c) 2007-2009 Novell Inc. |
| 16 | * |
| 17 | * This file is released under the GPLv2 |
| 18 | */ |
| 19 | |
| 20 | #include <linux/device.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/kthread.h> |
| 24 | #include <linux/wait.h> |
| 25 | #include <linux/async.h> |
| 26 | #include <linux/pm_runtime.h> |
| 27 | |
| 28 | #include "base.h" |
| 29 | #include "power/power.h" |
| 30 | |
| 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 |
| 48 | * of the (struct device*)->p->deferred_probe pointers are manipulated |
| 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; |
| 61 | struct device_private *private; |
| 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)) { |
| 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); |
| 80 | |
| 81 | get_device(dev); |
| 82 | |
| 83 | /* |
| 84 | * Drop the mutex while probing each device; the probe path may |
| 85 | * manipulate the deferred list |
| 86 | */ |
| 87 | mutex_unlock(&deferred_probe_mutex); |
| 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 | |
| 99 | dev_dbg(dev, "Retrying from deferred list\n"); |
| 100 | bus_probe_device(dev); |
| 101 | |
| 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); |
| 113 | if (list_empty(&dev->p->deferred_probe)) { |
| 114 | dev_dbg(dev, "Added to deferred list\n"); |
| 115 | list_add_tail(&dev->p->deferred_probe, &deferred_probe_pending_list); |
| 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); |
| 123 | if (!list_empty(&dev->p->deferred_probe)) { |
| 124 | dev_dbg(dev, "Removed from deferred list\n"); |
| 125 | list_del_init(&dev->p->deferred_probe); |
| 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 | |
| 143 | /* |
| 144 | * A successful probe means that all the devices in the pending list |
| 145 | * should be triggered to be reprobed. Move all the deferred devices |
| 146 | * into the active list so they can be retried by the workqueue |
| 147 | */ |
| 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 | |
| 153 | /* |
| 154 | * Kick the re-probe thread. It may already be scheduled, but it is |
| 155 | * safe to kick it again. |
| 156 | */ |
| 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); |
| 178 | |
| 179 | static void driver_bound(struct device *dev) |
| 180 | { |
| 181 | if (klist_node_attached(&dev->p->knode_driver)) { |
| 182 | printk(KERN_WARNING "%s: device %s already bound\n", |
| 183 | __func__, kobject_name(&dev->kobj)); |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | pr_debug("driver: '%s': %s: bound to device '%s'\n", dev_name(dev), |
| 188 | __func__, dev->driver->name); |
| 189 | |
| 190 | klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices); |
| 191 | |
| 192 | /* |
| 193 | * Make sure the device is no longer in one of the deferred lists and |
| 194 | * kick off retrying all pending devices |
| 195 | */ |
| 196 | driver_deferred_probe_del(dev); |
| 197 | driver_deferred_probe_trigger(); |
| 198 | |
| 199 | if (dev->bus) |
| 200 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| 201 | BUS_NOTIFY_BOUND_DRIVER, dev); |
| 202 | } |
| 203 | |
| 204 | static int driver_sysfs_add(struct device *dev) |
| 205 | { |
| 206 | int ret; |
| 207 | |
| 208 | if (dev->bus) |
| 209 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| 210 | BUS_NOTIFY_BIND_DRIVER, dev); |
| 211 | |
| 212 | ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj, |
| 213 | kobject_name(&dev->kobj)); |
| 214 | if (ret == 0) { |
| 215 | ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj, |
| 216 | "driver"); |
| 217 | if (ret) |
| 218 | sysfs_remove_link(&dev->driver->p->kobj, |
| 219 | kobject_name(&dev->kobj)); |
| 220 | } |
| 221 | return ret; |
| 222 | } |
| 223 | |
| 224 | static void driver_sysfs_remove(struct device *dev) |
| 225 | { |
| 226 | struct device_driver *drv = dev->driver; |
| 227 | |
| 228 | if (drv) { |
| 229 | sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj)); |
| 230 | sysfs_remove_link(&dev->kobj, "driver"); |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * device_bind_driver - bind a driver to one device. |
| 236 | * @dev: device. |
| 237 | * |
| 238 | * Allow manual attachment of a driver to a device. |
| 239 | * Caller must have already set @dev->driver. |
| 240 | * |
| 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.) |
| 245 | * |
| 246 | * This function must be called with the device lock held. |
| 247 | */ |
| 248 | int device_bind_driver(struct device *dev) |
| 249 | { |
| 250 | int ret; |
| 251 | |
| 252 | ret = driver_sysfs_add(dev); |
| 253 | if (!ret) |
| 254 | driver_bound(dev); |
| 255 | return ret; |
| 256 | } |
| 257 | EXPORT_SYMBOL_GPL(device_bind_driver); |
| 258 | |
| 259 | static atomic_t probe_count = ATOMIC_INIT(0); |
| 260 | static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue); |
| 261 | |
| 262 | static int really_probe(struct device *dev, struct device_driver *drv) |
| 263 | { |
| 264 | int ret = 0; |
| 265 | |
| 266 | atomic_inc(&probe_count); |
| 267 | pr_debug("bus: '%s': %s: probing driver %s with device %s\n", |
| 268 | drv->bus->name, __func__, drv->name, dev_name(dev)); |
| 269 | WARN_ON(!list_empty(&dev->devres_head)); |
| 270 | |
| 271 | dev->driver = drv; |
| 272 | if (driver_sysfs_add(dev)) { |
| 273 | printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n", |
| 274 | __func__, dev_name(dev)); |
| 275 | goto probe_failed; |
| 276 | } |
| 277 | |
| 278 | if (dev->bus->probe) { |
| 279 | ret = dev->bus->probe(dev); |
| 280 | if (ret) |
| 281 | goto probe_failed; |
| 282 | } else if (drv->probe) { |
| 283 | ret = drv->probe(dev); |
| 284 | if (ret) |
| 285 | goto probe_failed; |
| 286 | } |
| 287 | |
| 288 | driver_bound(dev); |
| 289 | ret = 1; |
| 290 | pr_debug("bus: '%s': %s: bound device %s to driver %s\n", |
| 291 | drv->bus->name, __func__, dev_name(dev), drv->name); |
| 292 | goto done; |
| 293 | |
| 294 | probe_failed: |
| 295 | devres_release_all(dev); |
| 296 | driver_sysfs_remove(dev); |
| 297 | dev->driver = NULL; |
| 298 | dev_set_drvdata(dev, NULL); |
| 299 | |
| 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) { |
| 305 | /* driver matched but the probe failed */ |
| 306 | printk(KERN_WARNING |
| 307 | "%s: probe of %s failed with error %d\n", |
| 308 | drv->name, dev_name(dev), ret); |
| 309 | } else { |
| 310 | pr_debug("%s: probe of %s rejects match %d\n", |
| 311 | drv->name, dev_name(dev), ret); |
| 312 | } |
| 313 | /* |
| 314 | * Ignore errors returned by ->probe so that the next driver can try |
| 315 | * its luck. |
| 316 | */ |
| 317 | ret = 0; |
| 318 | done: |
| 319 | atomic_dec(&probe_count); |
| 320 | wake_up(&probe_waitqueue); |
| 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 | { |
| 332 | pr_debug("%s: probe_count = %d\n", __func__, |
| 333 | atomic_read(&probe_count)); |
| 334 | if (atomic_read(&probe_count)) |
| 335 | return -EBUSY; |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * wait_for_device_probe |
| 341 | * Wait for device probing to be completed. |
| 342 | */ |
| 343 | void wait_for_device_probe(void) |
| 344 | { |
| 345 | /* wait for the known devices to complete their probing */ |
| 346 | wait_event(probe_waitqueue, atomic_read(&probe_count) == 0); |
| 347 | async_synchronize_full(); |
| 348 | } |
| 349 | EXPORT_SYMBOL_GPL(wait_for_device_probe); |
| 350 | |
| 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 | * |
| 356 | * This function returns -ENODEV if the device is not registered, |
| 357 | * 1 if the device is bound successfully and 0 otherwise. |
| 358 | * |
| 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. |
| 361 | */ |
| 362 | int driver_probe_device(struct device_driver *drv, struct device *dev) |
| 363 | { |
| 364 | int ret = 0; |
| 365 | |
| 366 | if (!device_is_registered(dev)) |
| 367 | return -ENODEV; |
| 368 | |
| 369 | pr_debug("bus: '%s': %s: matched device %s with driver %s\n", |
| 370 | drv->bus->name, __func__, dev_name(dev), drv->name); |
| 371 | |
| 372 | pm_runtime_barrier(dev); |
| 373 | ret = really_probe(dev, drv); |
| 374 | pm_runtime_idle(dev); |
| 375 | |
| 376 | return ret; |
| 377 | } |
| 378 | |
| 379 | static int __device_attach(struct device_driver *drv, void *data) |
| 380 | { |
| 381 | struct device *dev = data; |
| 382 | |
| 383 | if (!driver_match_device(drv, dev)) |
| 384 | return 0; |
| 385 | |
| 386 | return driver_probe_device(drv, dev); |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * device_attach - try to attach device to a driver. |
| 391 | * @dev: device. |
| 392 | * |
| 393 | * Walk the list of drivers that the bus has and call |
| 394 | * driver_probe_device() for each pair. If a compatible |
| 395 | * pair is found, break out and return. |
| 396 | * |
| 397 | * Returns 1 if the device was bound to a driver; |
| 398 | * 0 if no matching driver was found; |
| 399 | * -ENODEV if the device is not registered. |
| 400 | * |
| 401 | * When called for a USB interface, @dev->parent lock must be held. |
| 402 | */ |
| 403 | int device_attach(struct device *dev) |
| 404 | { |
| 405 | int ret = 0; |
| 406 | |
| 407 | device_lock(dev); |
| 408 | if (dev->driver) { |
| 409 | if (klist_node_attached(&dev->p->knode_driver)) { |
| 410 | ret = 1; |
| 411 | goto out_unlock; |
| 412 | } |
| 413 | ret = device_bind_driver(dev); |
| 414 | if (ret == 0) |
| 415 | ret = 1; |
| 416 | else { |
| 417 | dev->driver = NULL; |
| 418 | ret = 0; |
| 419 | } |
| 420 | } else { |
| 421 | ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach); |
| 422 | pm_runtime_idle(dev); |
| 423 | } |
| 424 | out_unlock: |
| 425 | device_unlock(dev); |
| 426 | return ret; |
| 427 | } |
| 428 | EXPORT_SYMBOL_GPL(device_attach); |
| 429 | |
| 430 | static int __driver_attach(struct device *dev, void *data) |
| 431 | { |
| 432 | struct device_driver *drv = data; |
| 433 | |
| 434 | /* |
| 435 | * Lock device and try to bind to it. We drop the error |
| 436 | * here and always return 0, because we need to keep trying |
| 437 | * to bind to devices and some drivers will return an error |
| 438 | * simply if it didn't support the device. |
| 439 | * |
| 440 | * driver_probe_device() will spit a warning if there |
| 441 | * is an error. |
| 442 | */ |
| 443 | |
| 444 | if (!driver_match_device(drv, dev)) |
| 445 | return 0; |
| 446 | |
| 447 | if (dev->parent) /* Needed for USB */ |
| 448 | device_lock(dev->parent); |
| 449 | device_lock(dev); |
| 450 | if (!dev->driver) |
| 451 | driver_probe_device(drv, dev); |
| 452 | device_unlock(dev); |
| 453 | if (dev->parent) |
| 454 | device_unlock(dev->parent); |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | /** |
| 460 | * driver_attach - try to bind driver to devices. |
| 461 | * @drv: driver. |
| 462 | * |
| 463 | * Walk the list of devices that the bus has on it and try to |
| 464 | * match the driver with each one. If driver_probe_device() |
| 465 | * returns 0 and the @dev->driver is set, we've found a |
| 466 | * compatible pair. |
| 467 | */ |
| 468 | int driver_attach(struct device_driver *drv) |
| 469 | { |
| 470 | return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach); |
| 471 | } |
| 472 | EXPORT_SYMBOL_GPL(driver_attach); |
| 473 | |
| 474 | /* |
| 475 | * __device_release_driver() must be called with @dev lock held. |
| 476 | * When called for a USB interface, @dev->parent lock must be held as well. |
| 477 | */ |
| 478 | static void __device_release_driver(struct device *dev) |
| 479 | { |
| 480 | struct device_driver *drv; |
| 481 | |
| 482 | drv = dev->driver; |
| 483 | if (drv) { |
| 484 | pm_runtime_get_sync(dev); |
| 485 | |
| 486 | driver_sysfs_remove(dev); |
| 487 | |
| 488 | if (dev->bus) |
| 489 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| 490 | BUS_NOTIFY_UNBIND_DRIVER, |
| 491 | dev); |
| 492 | |
| 493 | pm_runtime_put_sync(dev); |
| 494 | |
| 495 | if (dev->bus && dev->bus->remove) |
| 496 | dev->bus->remove(dev); |
| 497 | else if (drv->remove) |
| 498 | drv->remove(dev); |
| 499 | devres_release_all(dev); |
| 500 | dev->driver = NULL; |
| 501 | dev_set_drvdata(dev, NULL); |
| 502 | klist_remove(&dev->p->knode_driver); |
| 503 | if (dev->bus) |
| 504 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| 505 | BUS_NOTIFY_UNBOUND_DRIVER, |
| 506 | dev); |
| 507 | |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | /** |
| 512 | * device_release_driver - manually detach device from driver. |
| 513 | * @dev: device. |
| 514 | * |
| 515 | * Manually detach device from driver. |
| 516 | * When called for a USB interface, @dev->parent lock must be held. |
| 517 | */ |
| 518 | void device_release_driver(struct device *dev) |
| 519 | { |
| 520 | /* |
| 521 | * If anyone calls device_release_driver() recursively from |
| 522 | * within their ->remove callback for the same device, they |
| 523 | * will deadlock right here. |
| 524 | */ |
| 525 | device_lock(dev); |
| 526 | __device_release_driver(dev); |
| 527 | device_unlock(dev); |
| 528 | } |
| 529 | EXPORT_SYMBOL_GPL(device_release_driver); |
| 530 | |
| 531 | /** |
| 532 | * driver_detach - detach driver from all devices it controls. |
| 533 | * @drv: driver. |
| 534 | */ |
| 535 | void driver_detach(struct device_driver *drv) |
| 536 | { |
| 537 | struct device_private *dev_prv; |
| 538 | struct device *dev; |
| 539 | |
| 540 | for (;;) { |
| 541 | spin_lock(&drv->p->klist_devices.k_lock); |
| 542 | if (list_empty(&drv->p->klist_devices.k_list)) { |
| 543 | spin_unlock(&drv->p->klist_devices.k_lock); |
| 544 | break; |
| 545 | } |
| 546 | dev_prv = list_entry(drv->p->klist_devices.k_list.prev, |
| 547 | struct device_private, |
| 548 | knode_driver.n_node); |
| 549 | dev = dev_prv->device; |
| 550 | get_device(dev); |
| 551 | spin_unlock(&drv->p->klist_devices.k_lock); |
| 552 | |
| 553 | if (dev->parent) /* Needed for USB */ |
| 554 | device_lock(dev->parent); |
| 555 | device_lock(dev); |
| 556 | if (dev->driver == drv) |
| 557 | __device_release_driver(dev); |
| 558 | device_unlock(dev); |
| 559 | if (dev->parent) |
| 560 | device_unlock(dev->parent); |
| 561 | put_device(dev); |
| 562 | } |
| 563 | } |
| 564 | |
| 565 | /* |
| 566 | * These exports can't be _GPL due to .h files using this within them, and it |
| 567 | * might break something that was previously working... |
| 568 | */ |
| 569 | void *dev_get_drvdata(const struct device *dev) |
| 570 | { |
| 571 | if (dev && dev->p) |
| 572 | return dev->p->driver_data; |
| 573 | return NULL; |
| 574 | } |
| 575 | EXPORT_SYMBOL(dev_get_drvdata); |
| 576 | |
| 577 | int dev_set_drvdata(struct device *dev, void *data) |
| 578 | { |
| 579 | int error; |
| 580 | |
| 581 | if (!dev->p) { |
| 582 | error = device_private_init(dev); |
| 583 | if (error) |
| 584 | return error; |
| 585 | } |
| 586 | dev->p->driver_data = data; |
| 587 | return 0; |
| 588 | } |
| 589 | EXPORT_SYMBOL(dev_set_drvdata); |