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Commit | Line | Data |
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1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_fops.c |
1da177e4 | 3 | * File operations for DRM |
b5e89ed5 | 4 | * |
1da177e4 LT |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
6 | * \author Daryll Strauss <daryll@valinux.com> | |
7 | * \author Gareth Hughes <gareth@valinux.com> | |
8 | */ | |
9 | ||
10 | /* | |
11 | * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com | |
12 | * | |
13 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
14 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
15 | * All Rights Reserved. | |
16 | * | |
17 | * Permission is hereby granted, free of charge, to any person obtaining a | |
18 | * copy of this software and associated documentation files (the "Software"), | |
19 | * to deal in the Software without restriction, including without limitation | |
20 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
21 | * and/or sell copies of the Software, and to permit persons to whom the | |
22 | * Software is furnished to do so, subject to the following conditions: | |
23 | * | |
24 | * The above copyright notice and this permission notice (including the next | |
25 | * paragraph) shall be included in all copies or substantial portions of the | |
26 | * Software. | |
27 | * | |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
29 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
30 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
31 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
32 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
33 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
34 | * OTHER DEALINGS IN THE SOFTWARE. | |
35 | */ | |
36 | ||
37 | #include "drmP.h" | |
d985c108 | 38 | #include "drm_sarea.h" |
1da177e4 | 39 | #include <linux/poll.h> |
70ffa16e | 40 | #include <linux/smp_lock.h> |
1da177e4 | 41 | |
b5e89ed5 | 42 | static int drm_open_helper(struct inode *inode, struct file *filp, |
84b1fd10 | 43 | struct drm_device * dev); |
c94f7029 | 44 | |
84b1fd10 | 45 | static int drm_setup(struct drm_device * dev) |
1da177e4 LT |
46 | { |
47 | int i; | |
48 | int ret; | |
49 | ||
22eae947 DA |
50 | if (dev->driver->firstopen) { |
51 | ret = dev->driver->firstopen(dev); | |
b5e89ed5 | 52 | if (ret != 0) |
1da177e4 LT |
53 | return ret; |
54 | } | |
55 | ||
b5e89ed5 DA |
56 | atomic_set(&dev->ioctl_count, 0); |
57 | atomic_set(&dev->vma_count, 0); | |
1da177e4 | 58 | dev->buf_use = 0; |
b5e89ed5 | 59 | atomic_set(&dev->buf_alloc, 0); |
1da177e4 | 60 | |
b5e89ed5 DA |
61 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) { |
62 | i = drm_dma_setup(dev); | |
63 | if (i < 0) | |
1da177e4 LT |
64 | return i; |
65 | } | |
66 | ||
3d77461e | 67 | for (i = 0; i < ARRAY_SIZE(dev->counts); i++) |
b5e89ed5 | 68 | atomic_set(&dev->counts[i], 0); |
1da177e4 | 69 | |
11d9c2fd | 70 | dev->sigdata.lock = NULL; |
7c1c2871 | 71 | |
1da177e4 LT |
72 | dev->queue_count = 0; |
73 | dev->queue_reserved = 0; | |
74 | dev->queue_slots = 0; | |
75 | dev->queuelist = NULL; | |
1da177e4 LT |
76 | dev->context_flag = 0; |
77 | dev->interrupt_flag = 0; | |
78 | dev->dma_flag = 0; | |
79 | dev->last_context = 0; | |
80 | dev->last_switch = 0; | |
81 | dev->last_checked = 0; | |
b5e89ed5 | 82 | init_waitqueue_head(&dev->context_wait); |
1da177e4 LT |
83 | dev->if_version = 0; |
84 | ||
85 | dev->ctx_start = 0; | |
86 | dev->lck_start = 0; | |
87 | ||
1da177e4 | 88 | dev->buf_async = NULL; |
b5e89ed5 DA |
89 | init_waitqueue_head(&dev->buf_readers); |
90 | init_waitqueue_head(&dev->buf_writers); | |
1da177e4 | 91 | |
b5e89ed5 | 92 | DRM_DEBUG("\n"); |
1da177e4 LT |
93 | |
94 | /* | |
95 | * The kernel's context could be created here, but is now created | |
b5e89ed5 | 96 | * in drm_dma_enqueue. This is more resource-efficient for |
1da177e4 LT |
97 | * hardware that does not do DMA, but may mean that |
98 | * drm_select_queue fails between the time the interrupt is | |
99 | * initialized and the time the queues are initialized. | |
100 | */ | |
1da177e4 LT |
101 | |
102 | return 0; | |
103 | } | |
104 | ||
105 | /** | |
106 | * Open file. | |
b5e89ed5 | 107 | * |
1da177e4 LT |
108 | * \param inode device inode |
109 | * \param filp file pointer. | |
110 | * \return zero on success or a negative number on failure. | |
111 | * | |
112 | * Searches the DRM device with the same minor number, calls open_helper(), and | |
113 | * increments the device open count. If the open count was previous at zero, | |
114 | * i.e., it's the first that the device is open, then calls setup(). | |
115 | */ | |
b5e89ed5 | 116 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 | 117 | { |
84b1fd10 | 118 | struct drm_device *dev = NULL; |
2c14f28b DA |
119 | int minor_id = iminor(inode); |
120 | struct drm_minor *minor; | |
1da177e4 LT |
121 | int retcode = 0; |
122 | ||
2c14f28b DA |
123 | minor = idr_find(&drm_minors_idr, minor_id); |
124 | if (!minor) | |
1da177e4 | 125 | return -ENODEV; |
b5e89ed5 | 126 | |
2c14f28b | 127 | if (!(dev = minor->dev)) |
1da177e4 | 128 | return -ENODEV; |
b5e89ed5 DA |
129 | |
130 | retcode = drm_open_helper(inode, filp, dev); | |
131 | if (!retcode) { | |
132 | atomic_inc(&dev->counts[_DRM_STAT_OPENS]); | |
133 | spin_lock(&dev->count_lock); | |
134 | if (!dev->open_count++) { | |
135 | spin_unlock(&dev->count_lock); | |
136 | return drm_setup(dev); | |
1da177e4 | 137 | } |
b5e89ed5 | 138 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
139 | } |
140 | ||
141 | return retcode; | |
142 | } | |
143 | EXPORT_SYMBOL(drm_open); | |
144 | ||
d985c108 DA |
145 | /** |
146 | * File \c open operation. | |
147 | * | |
148 | * \param inode device inode. | |
149 | * \param filp file pointer. | |
150 | * | |
151 | * Puts the dev->fops corresponding to the device minor number into | |
152 | * \p filp, call the \c open method, and restore the file operations. | |
153 | */ | |
154 | int drm_stub_open(struct inode *inode, struct file *filp) | |
155 | { | |
84b1fd10 | 156 | struct drm_device *dev = NULL; |
2c14f28b DA |
157 | struct drm_minor *minor; |
158 | int minor_id = iminor(inode); | |
d985c108 | 159 | int err = -ENODEV; |
99ac48f5 | 160 | const struct file_operations *old_fops; |
d985c108 DA |
161 | |
162 | DRM_DEBUG("\n"); | |
163 | ||
70ffa16e JC |
164 | /* BKL pushdown: note that nothing else serializes idr_find() */ |
165 | lock_kernel(); | |
2c14f28b DA |
166 | minor = idr_find(&drm_minors_idr, minor_id); |
167 | if (!minor) | |
70ffa16e | 168 | goto out; |
d985c108 | 169 | |
2c14f28b | 170 | if (!(dev = minor->dev)) |
70ffa16e | 171 | goto out; |
d985c108 DA |
172 | |
173 | old_fops = filp->f_op; | |
174 | filp->f_op = fops_get(&dev->driver->fops); | |
175 | if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { | |
176 | fops_put(filp->f_op); | |
177 | filp->f_op = fops_get(old_fops); | |
178 | } | |
179 | fops_put(old_fops); | |
180 | ||
70ffa16e JC |
181 | out: |
182 | unlock_kernel(); | |
d985c108 DA |
183 | return err; |
184 | } | |
185 | ||
186 | /** | |
187 | * Check whether DRI will run on this CPU. | |
188 | * | |
189 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
190 | */ | |
191 | static int drm_cpu_valid(void) | |
192 | { | |
193 | #if defined(__i386__) | |
194 | if (boot_cpu_data.x86 == 3) | |
195 | return 0; /* No cmpxchg on a 386 */ | |
196 | #endif | |
197 | #if defined(__sparc__) && !defined(__sparc_v9__) | |
198 | return 0; /* No cmpxchg before v9 sparc. */ | |
199 | #endif | |
200 | return 1; | |
201 | } | |
202 | ||
203 | /** | |
204 | * Called whenever a process opens /dev/drm. | |
205 | * | |
206 | * \param inode device inode. | |
207 | * \param filp file pointer. | |
208 | * \param dev device. | |
209 | * \return zero on success or a negative number on failure. | |
210 | * | |
211 | * Creates and initializes a drm_file structure for the file private data in \p | |
212 | * filp and add it into the double linked list in \p dev. | |
213 | */ | |
214 | static int drm_open_helper(struct inode *inode, struct file *filp, | |
84b1fd10 | 215 | struct drm_device * dev) |
d985c108 | 216 | { |
2c14f28b | 217 | int minor_id = iminor(inode); |
84b1fd10 | 218 | struct drm_file *priv; |
d985c108 DA |
219 | int ret; |
220 | ||
221 | if (filp->f_flags & O_EXCL) | |
222 | return -EBUSY; /* No exclusive opens */ | |
223 | if (!drm_cpu_valid()) | |
224 | return -EINVAL; | |
225 | ||
2c14f28b | 226 | DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id); |
d985c108 DA |
227 | |
228 | priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); | |
229 | if (!priv) | |
230 | return -ENOMEM; | |
231 | ||
232 | memset(priv, 0, sizeof(*priv)); | |
233 | filp->private_data = priv; | |
6c340eac | 234 | priv->filp = filp; |
2df68b43 | 235 | priv->uid = current_euid(); |
ba25f9dc | 236 | priv->pid = task_pid_nr(current); |
2c14f28b | 237 | priv->minor = idr_find(&drm_minors_idr, minor_id); |
d985c108 DA |
238 | priv->ioctl_count = 0; |
239 | /* for compatibility root is always authenticated */ | |
240 | priv->authenticated = capable(CAP_SYS_ADMIN); | |
241 | priv->lock_count = 0; | |
242 | ||
bd1b331f DA |
243 | INIT_LIST_HEAD(&priv->lhead); |
244 | ||
673a394b EA |
245 | if (dev->driver->driver_features & DRIVER_GEM) |
246 | drm_gem_open(dev, priv); | |
247 | ||
d985c108 DA |
248 | if (dev->driver->open) { |
249 | ret = dev->driver->open(dev, priv); | |
250 | if (ret < 0) | |
251 | goto out_free; | |
252 | } | |
253 | ||
7c1c2871 DA |
254 | |
255 | /* if there is no current master make this fd it */ | |
30e2fb18 | 256 | mutex_lock(&dev->struct_mutex); |
7c1c2871 DA |
257 | if (!priv->minor->master) { |
258 | /* create a new master */ | |
259 | priv->minor->master = drm_master_create(priv->minor); | |
260 | if (!priv->minor->master) { | |
261 | ret = -ENOMEM; | |
262 | goto out_free; | |
263 | } | |
264 | ||
265 | priv->is_master = 1; | |
266 | /* take another reference for the copy in the local file priv */ | |
267 | priv->master = drm_master_get(priv->minor->master); | |
268 | ||
269 | priv->authenticated = 1; | |
270 | ||
271 | mutex_unlock(&dev->struct_mutex); | |
272 | if (dev->driver->master_create) { | |
273 | ret = dev->driver->master_create(dev, priv->master); | |
274 | if (ret) { | |
275 | mutex_lock(&dev->struct_mutex); | |
276 | /* drop both references if this fails */ | |
277 | drm_master_put(&priv->minor->master); | |
278 | drm_master_put(&priv->master); | |
279 | mutex_unlock(&dev->struct_mutex); | |
280 | goto out_free; | |
281 | } | |
282 | } | |
283 | } else { | |
284 | /* get a reference to the master */ | |
285 | priv->master = drm_master_get(priv->minor->master); | |
286 | mutex_unlock(&dev->struct_mutex); | |
287 | } | |
bd1b331f | 288 | |
7c1c2871 | 289 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 290 | list_add(&priv->lhead, &dev->filelist); |
30e2fb18 | 291 | mutex_unlock(&dev->struct_mutex); |
d985c108 DA |
292 | |
293 | #ifdef __alpha__ | |
294 | /* | |
295 | * Default the hose | |
296 | */ | |
297 | if (!dev->hose) { | |
298 | struct pci_dev *pci_dev; | |
299 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
300 | if (pci_dev) { | |
301 | dev->hose = pci_dev->sysdata; | |
302 | pci_dev_put(pci_dev); | |
303 | } | |
304 | if (!dev->hose) { | |
305 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); | |
306 | if (b) | |
307 | dev->hose = b->sysdata; | |
308 | } | |
309 | } | |
310 | #endif | |
311 | ||
312 | return 0; | |
313 | out_free: | |
314 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); | |
315 | filp->private_data = NULL; | |
316 | return ret; | |
317 | } | |
318 | ||
319 | /** No-op. */ | |
320 | int drm_fasync(int fd, struct file *filp, int on) | |
321 | { | |
84b1fd10 | 322 | struct drm_file *priv = filp->private_data; |
2c14f28b | 323 | struct drm_device *dev = priv->minor->dev; |
d985c108 DA |
324 | int retcode; |
325 | ||
326 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, | |
2c14f28b | 327 | (long)old_encode_dev(priv->minor->device)); |
d985c108 DA |
328 | retcode = fasync_helper(fd, filp, on, &dev->buf_async); |
329 | if (retcode < 0) | |
330 | return retcode; | |
331 | return 0; | |
332 | } | |
333 | EXPORT_SYMBOL(drm_fasync); | |
334 | ||
7c1c2871 DA |
335 | /* |
336 | * Reclaim locked buffers; note that this may be a bad idea if the current | |
337 | * context doesn't have the hw lock... | |
338 | */ | |
339 | static void drm_reclaim_locked_buffers(struct drm_device *dev, struct file *f) | |
340 | { | |
341 | struct drm_file *file_priv = f->private_data; | |
342 | ||
343 | if (drm_i_have_hw_lock(dev, file_priv)) { | |
344 | dev->driver->reclaim_buffers_locked(dev, file_priv); | |
345 | } else { | |
346 | unsigned long _end = jiffies + 3 * DRM_HZ; | |
347 | int locked = 0; | |
348 | ||
349 | drm_idlelock_take(&file_priv->master->lock); | |
350 | ||
351 | /* | |
352 | * Wait for a while. | |
353 | */ | |
354 | do { | |
355 | spin_lock_bh(&file_priv->master->lock.spinlock); | |
356 | locked = file_priv->master->lock.idle_has_lock; | |
357 | spin_unlock_bh(&file_priv->master->lock.spinlock); | |
358 | if (locked) | |
359 | break; | |
360 | schedule(); | |
361 | } while (!time_after_eq(jiffies, _end)); | |
362 | ||
363 | if (!locked) { | |
364 | DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n" | |
365 | "\tdriver to use reclaim_buffers_idlelocked() instead.\n" | |
366 | "\tI will go on reclaiming the buffers anyway.\n"); | |
367 | } | |
368 | ||
369 | dev->driver->reclaim_buffers_locked(dev, file_priv); | |
370 | drm_idlelock_release(&file_priv->master->lock); | |
371 | } | |
372 | } | |
373 | ||
374 | static void drm_master_release(struct drm_device *dev, struct file *filp) | |
375 | { | |
376 | struct drm_file *file_priv = filp->private_data; | |
377 | ||
378 | if (dev->driver->reclaim_buffers_locked && | |
379 | file_priv->master->lock.hw_lock) | |
380 | drm_reclaim_locked_buffers(dev, filp); | |
381 | ||
382 | if (dev->driver->reclaim_buffers_idlelocked && | |
383 | file_priv->master->lock.hw_lock) { | |
384 | drm_idlelock_take(&file_priv->master->lock); | |
385 | dev->driver->reclaim_buffers_idlelocked(dev, file_priv); | |
386 | drm_idlelock_release(&file_priv->master->lock); | |
387 | } | |
388 | ||
389 | ||
390 | if (drm_i_have_hw_lock(dev, file_priv)) { | |
391 | DRM_DEBUG("File %p released, freeing lock for context %d\n", | |
392 | filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); | |
393 | drm_lock_free(&file_priv->master->lock, | |
394 | _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); | |
395 | } | |
396 | ||
397 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && | |
398 | !dev->driver->reclaim_buffers_locked) { | |
399 | dev->driver->reclaim_buffers(dev, file_priv); | |
400 | } | |
401 | } | |
402 | ||
1da177e4 LT |
403 | /** |
404 | * Release file. | |
405 | * | |
406 | * \param inode device inode | |
6c340eac | 407 | * \param file_priv DRM file private. |
1da177e4 LT |
408 | * \return zero on success or a negative number on failure. |
409 | * | |
410 | * If the hardware lock is held then free it, and take it again for the kernel | |
411 | * context since it's necessary to reclaim buffers. Unlink the file private | |
412 | * data from its list and free it. Decreases the open count and if it reaches | |
22eae947 | 413 | * zero calls drm_lastclose(). |
1da177e4 | 414 | */ |
b5e89ed5 | 415 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 | 416 | { |
6c340eac | 417 | struct drm_file *file_priv = filp->private_data; |
2c14f28b | 418 | struct drm_device *dev = file_priv->minor->dev; |
1da177e4 LT |
419 | int retcode = 0; |
420 | ||
421 | lock_kernel(); | |
1da177e4 | 422 | |
b5e89ed5 | 423 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 | 424 | |
22eae947 | 425 | if (dev->driver->preclose) |
6c340eac | 426 | dev->driver->preclose(dev, file_priv); |
1da177e4 LT |
427 | |
428 | /* ======================================================== | |
429 | * Begin inline drm_release | |
430 | */ | |
431 | ||
b5e89ed5 | 432 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
ba25f9dc | 433 | task_pid_nr(current), |
2c14f28b | 434 | (long)old_encode_dev(file_priv->minor->device), |
b5e89ed5 DA |
435 | dev->open_count); |
436 | ||
7c1c2871 DA |
437 | /* if the master has gone away we can't do anything with the lock */ |
438 | if (file_priv->minor->master) | |
439 | drm_master_release(dev, filp); | |
1da177e4 | 440 | |
673a394b EA |
441 | if (dev->driver->driver_features & DRIVER_GEM) |
442 | drm_gem_release(dev, file_priv); | |
443 | ||
30e2fb18 | 444 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 445 | if (!list_empty(&dev->ctxlist)) { |
55910517 | 446 | struct drm_ctx_list *pos, *n; |
1da177e4 | 447 | |
bd1b331f | 448 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
6c340eac | 449 | if (pos->tag == file_priv && |
b5e89ed5 | 450 | pos->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 451 | if (dev->driver->context_dtor) |
b5e89ed5 DA |
452 | dev->driver->context_dtor(dev, |
453 | pos->handle); | |
1da177e4 | 454 | |
b5e89ed5 | 455 | drm_ctxbitmap_free(dev, pos->handle); |
1da177e4 | 456 | |
b5e89ed5 DA |
457 | list_del(&pos->head); |
458 | drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); | |
1da177e4 LT |
459 | --dev->ctx_count; |
460 | } | |
461 | } | |
462 | } | |
30e2fb18 | 463 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 464 | |
30e2fb18 | 465 | mutex_lock(&dev->struct_mutex); |
7c1c2871 DA |
466 | |
467 | if (file_priv->is_master) { | |
84b1fd10 | 468 | struct drm_file *temp; |
7c1c2871 DA |
469 | list_for_each_entry(temp, &dev->filelist, lhead) { |
470 | if ((temp->master == file_priv->master) && | |
471 | (temp != file_priv)) | |
472 | temp->authenticated = 0; | |
473 | } | |
bd1b331f | 474 | |
7c1c2871 DA |
475 | if (file_priv->minor->master == file_priv->master) { |
476 | /* drop the reference held my the minor */ | |
477 | drm_master_put(&file_priv->minor->master); | |
478 | } | |
1da177e4 | 479 | } |
7c1c2871 DA |
480 | |
481 | /* drop the reference held my the file priv */ | |
482 | drm_master_put(&file_priv->master); | |
483 | file_priv->is_master = 0; | |
6c340eac | 484 | list_del(&file_priv->lhead); |
30e2fb18 | 485 | mutex_unlock(&dev->struct_mutex); |
b5e89ed5 | 486 | |
22eae947 | 487 | if (dev->driver->postclose) |
6c340eac EA |
488 | dev->driver->postclose(dev, file_priv); |
489 | drm_free(file_priv, sizeof(*file_priv), DRM_MEM_FILES); | |
1da177e4 LT |
490 | |
491 | /* ======================================================== | |
492 | * End inline drm_release | |
493 | */ | |
494 | ||
b5e89ed5 DA |
495 | atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); |
496 | spin_lock(&dev->count_lock); | |
497 | if (!--dev->open_count) { | |
7c1c2871 DA |
498 | if (atomic_read(&dev->ioctl_count)) { |
499 | DRM_ERROR("Device busy: %d\n", | |
500 | atomic_read(&dev->ioctl_count)); | |
b5e89ed5 | 501 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
502 | unlock_kernel(); |
503 | return -EBUSY; | |
504 | } | |
b5e89ed5 | 505 | spin_unlock(&dev->count_lock); |
1da177e4 | 506 | unlock_kernel(); |
22eae947 | 507 | return drm_lastclose(dev); |
1da177e4 | 508 | } |
b5e89ed5 | 509 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
510 | |
511 | unlock_kernel(); | |
512 | ||
513 | return retcode; | |
514 | } | |
515 | EXPORT_SYMBOL(drm_release); | |
516 | ||
1da177e4 LT |
517 | /** No-op. */ |
518 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) | |
519 | { | |
520 | return 0; | |
521 | } | |
b5e89ed5 | 522 | EXPORT_SYMBOL(drm_poll); |