Commit | Line | Data |
---|---|---|
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" | |
38 | #include <linux/poll.h> | |
70ffa16e | 39 | #include <linux/smp_lock.h> |
1da177e4 | 40 | |
b5e89ed5 | 41 | static int drm_open_helper(struct inode *inode, struct file *filp, |
84b1fd10 | 42 | struct drm_device * dev); |
c94f7029 | 43 | |
84b1fd10 | 44 | static int drm_setup(struct drm_device * dev) |
1da177e4 LT |
45 | { |
46 | int i; | |
47 | int ret; | |
48 | ||
22eae947 DA |
49 | if (dev->driver->firstopen) { |
50 | ret = dev->driver->firstopen(dev); | |
b5e89ed5 | 51 | if (ret != 0) |
1da177e4 LT |
52 | return ret; |
53 | } | |
54 | ||
b5e89ed5 DA |
55 | atomic_set(&dev->ioctl_count, 0); |
56 | atomic_set(&dev->vma_count, 0); | |
1da177e4 | 57 | |
f453ba04 DA |
58 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && |
59 | !drm_core_check_feature(dev, DRIVER_MODESET)) { | |
60 | dev->buf_use = 0; | |
61 | atomic_set(&dev->buf_alloc, 0); | |
62 | ||
b5e89ed5 DA |
63 | i = drm_dma_setup(dev); |
64 | if (i < 0) | |
1da177e4 LT |
65 | return i; |
66 | } | |
67 | ||
3d77461e | 68 | for (i = 0; i < ARRAY_SIZE(dev->counts); i++) |
b5e89ed5 | 69 | atomic_set(&dev->counts[i], 0); |
1da177e4 | 70 | |
11d9c2fd | 71 | dev->sigdata.lock = NULL; |
7c1c2871 | 72 | |
1da177e4 LT |
73 | dev->queue_count = 0; |
74 | dev->queue_reserved = 0; | |
75 | dev->queue_slots = 0; | |
76 | dev->queuelist = NULL; | |
1da177e4 LT |
77 | dev->context_flag = 0; |
78 | dev->interrupt_flag = 0; | |
79 | dev->dma_flag = 0; | |
80 | dev->last_context = 0; | |
81 | dev->last_switch = 0; | |
82 | dev->last_checked = 0; | |
b5e89ed5 | 83 | init_waitqueue_head(&dev->context_wait); |
1da177e4 LT |
84 | dev->if_version = 0; |
85 | ||
86 | dev->ctx_start = 0; | |
87 | dev->lck_start = 0; | |
88 | ||
1da177e4 | 89 | dev->buf_async = NULL; |
b5e89ed5 DA |
90 | init_waitqueue_head(&dev->buf_readers); |
91 | init_waitqueue_head(&dev->buf_writers); | |
1da177e4 | 92 | |
b5e89ed5 | 93 | DRM_DEBUG("\n"); |
1da177e4 LT |
94 | |
95 | /* | |
96 | * The kernel's context could be created here, but is now created | |
b5e89ed5 | 97 | * in drm_dma_enqueue. This is more resource-efficient for |
1da177e4 LT |
98 | * hardware that does not do DMA, but may mean that |
99 | * drm_select_queue fails between the time the interrupt is | |
100 | * initialized and the time the queues are initialized. | |
101 | */ | |
1da177e4 LT |
102 | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /** | |
107 | * Open file. | |
b5e89ed5 | 108 | * |
1da177e4 LT |
109 | * \param inode device inode |
110 | * \param filp file pointer. | |
111 | * \return zero on success or a negative number on failure. | |
112 | * | |
113 | * Searches the DRM device with the same minor number, calls open_helper(), and | |
114 | * increments the device open count. If the open count was previous at zero, | |
115 | * i.e., it's the first that the device is open, then calls setup(). | |
116 | */ | |
b5e89ed5 | 117 | int drm_open(struct inode *inode, struct file *filp) |
1da177e4 | 118 | { |
84b1fd10 | 119 | struct drm_device *dev = NULL; |
2c14f28b DA |
120 | int minor_id = iminor(inode); |
121 | struct drm_minor *minor; | |
1da177e4 LT |
122 | int retcode = 0; |
123 | ||
2c14f28b DA |
124 | minor = idr_find(&drm_minors_idr, minor_id); |
125 | if (!minor) | |
1da177e4 | 126 | return -ENODEV; |
b5e89ed5 | 127 | |
2c14f28b | 128 | if (!(dev = minor->dev)) |
1da177e4 | 129 | return -ENODEV; |
b5e89ed5 DA |
130 | |
131 | retcode = drm_open_helper(inode, filp, dev); | |
132 | if (!retcode) { | |
133 | atomic_inc(&dev->counts[_DRM_STAT_OPENS]); | |
134 | spin_lock(&dev->count_lock); | |
135 | if (!dev->open_count++) { | |
136 | spin_unlock(&dev->count_lock); | |
a2c0a97b JB |
137 | retcode = drm_setup(dev); |
138 | goto out; | |
1da177e4 | 139 | } |
b5e89ed5 | 140 | spin_unlock(&dev->count_lock); |
1da177e4 | 141 | } |
a2c0a97b JB |
142 | out: |
143 | mutex_lock(&dev->struct_mutex); | |
f453ba04 DA |
144 | if (minor->type == DRM_MINOR_LEGACY) { |
145 | BUG_ON((dev->dev_mapping != NULL) && | |
146 | (dev->dev_mapping != inode->i_mapping)); | |
147 | if (dev->dev_mapping == NULL) | |
148 | dev->dev_mapping = inode->i_mapping; | |
149 | } | |
a2c0a97b JB |
150 | mutex_unlock(&dev->struct_mutex); |
151 | ||
1da177e4 LT |
152 | return retcode; |
153 | } | |
154 | EXPORT_SYMBOL(drm_open); | |
155 | ||
d985c108 DA |
156 | /** |
157 | * File \c open operation. | |
158 | * | |
159 | * \param inode device inode. | |
160 | * \param filp file pointer. | |
161 | * | |
162 | * Puts the dev->fops corresponding to the device minor number into | |
163 | * \p filp, call the \c open method, and restore the file operations. | |
164 | */ | |
165 | int drm_stub_open(struct inode *inode, struct file *filp) | |
166 | { | |
84b1fd10 | 167 | struct drm_device *dev = NULL; |
2c14f28b DA |
168 | struct drm_minor *minor; |
169 | int minor_id = iminor(inode); | |
d985c108 | 170 | int err = -ENODEV; |
99ac48f5 | 171 | const struct file_operations *old_fops; |
d985c108 DA |
172 | |
173 | DRM_DEBUG("\n"); | |
174 | ||
70ffa16e JC |
175 | /* BKL pushdown: note that nothing else serializes idr_find() */ |
176 | lock_kernel(); | |
2c14f28b DA |
177 | minor = idr_find(&drm_minors_idr, minor_id); |
178 | if (!minor) | |
70ffa16e | 179 | goto out; |
d985c108 | 180 | |
2c14f28b | 181 | if (!(dev = minor->dev)) |
70ffa16e | 182 | goto out; |
d985c108 DA |
183 | |
184 | old_fops = filp->f_op; | |
185 | filp->f_op = fops_get(&dev->driver->fops); | |
186 | if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) { | |
187 | fops_put(filp->f_op); | |
188 | filp->f_op = fops_get(old_fops); | |
189 | } | |
190 | fops_put(old_fops); | |
191 | ||
70ffa16e JC |
192 | out: |
193 | unlock_kernel(); | |
d985c108 DA |
194 | return err; |
195 | } | |
196 | ||
197 | /** | |
198 | * Check whether DRI will run on this CPU. | |
199 | * | |
200 | * \return non-zero if the DRI will run on this CPU, or zero otherwise. | |
201 | */ | |
202 | static int drm_cpu_valid(void) | |
203 | { | |
204 | #if defined(__i386__) | |
205 | if (boot_cpu_data.x86 == 3) | |
206 | return 0; /* No cmpxchg on a 386 */ | |
207 | #endif | |
208 | #if defined(__sparc__) && !defined(__sparc_v9__) | |
209 | return 0; /* No cmpxchg before v9 sparc. */ | |
210 | #endif | |
211 | return 1; | |
212 | } | |
213 | ||
214 | /** | |
215 | * Called whenever a process opens /dev/drm. | |
216 | * | |
217 | * \param inode device inode. | |
218 | * \param filp file pointer. | |
219 | * \param dev device. | |
220 | * \return zero on success or a negative number on failure. | |
221 | * | |
222 | * Creates and initializes a drm_file structure for the file private data in \p | |
223 | * filp and add it into the double linked list in \p dev. | |
224 | */ | |
225 | static int drm_open_helper(struct inode *inode, struct file *filp, | |
84b1fd10 | 226 | struct drm_device * dev) |
d985c108 | 227 | { |
2c14f28b | 228 | int minor_id = iminor(inode); |
84b1fd10 | 229 | struct drm_file *priv; |
d985c108 DA |
230 | int ret; |
231 | ||
232 | if (filp->f_flags & O_EXCL) | |
233 | return -EBUSY; /* No exclusive opens */ | |
234 | if (!drm_cpu_valid()) | |
235 | return -EINVAL; | |
236 | ||
2c14f28b | 237 | DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id); |
d985c108 DA |
238 | |
239 | priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); | |
240 | if (!priv) | |
241 | return -ENOMEM; | |
242 | ||
243 | memset(priv, 0, sizeof(*priv)); | |
244 | filp->private_data = priv; | |
6c340eac | 245 | priv->filp = filp; |
2df68b43 | 246 | priv->uid = current_euid(); |
ba25f9dc | 247 | priv->pid = task_pid_nr(current); |
2c14f28b | 248 | priv->minor = idr_find(&drm_minors_idr, minor_id); |
d985c108 DA |
249 | priv->ioctl_count = 0; |
250 | /* for compatibility root is always authenticated */ | |
251 | priv->authenticated = capable(CAP_SYS_ADMIN); | |
252 | priv->lock_count = 0; | |
253 | ||
bd1b331f | 254 | INIT_LIST_HEAD(&priv->lhead); |
f453ba04 | 255 | INIT_LIST_HEAD(&priv->fbs); |
bd1b331f | 256 | |
673a394b EA |
257 | if (dev->driver->driver_features & DRIVER_GEM) |
258 | drm_gem_open(dev, priv); | |
259 | ||
d985c108 DA |
260 | if (dev->driver->open) { |
261 | ret = dev->driver->open(dev, priv); | |
262 | if (ret < 0) | |
263 | goto out_free; | |
264 | } | |
265 | ||
7c1c2871 DA |
266 | |
267 | /* if there is no current master make this fd it */ | |
30e2fb18 | 268 | mutex_lock(&dev->struct_mutex); |
7c1c2871 DA |
269 | if (!priv->minor->master) { |
270 | /* create a new master */ | |
271 | priv->minor->master = drm_master_create(priv->minor); | |
272 | if (!priv->minor->master) { | |
273 | ret = -ENOMEM; | |
274 | goto out_free; | |
275 | } | |
276 | ||
277 | priv->is_master = 1; | |
278 | /* take another reference for the copy in the local file priv */ | |
279 | priv->master = drm_master_get(priv->minor->master); | |
280 | ||
281 | priv->authenticated = 1; | |
282 | ||
283 | mutex_unlock(&dev->struct_mutex); | |
284 | if (dev->driver->master_create) { | |
285 | ret = dev->driver->master_create(dev, priv->master); | |
286 | if (ret) { | |
287 | mutex_lock(&dev->struct_mutex); | |
288 | /* drop both references if this fails */ | |
289 | drm_master_put(&priv->minor->master); | |
290 | drm_master_put(&priv->master); | |
291 | mutex_unlock(&dev->struct_mutex); | |
292 | goto out_free; | |
293 | } | |
294 | } | |
295 | } else { | |
296 | /* get a reference to the master */ | |
297 | priv->master = drm_master_get(priv->minor->master); | |
298 | mutex_unlock(&dev->struct_mutex); | |
299 | } | |
bd1b331f | 300 | |
7c1c2871 | 301 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 302 | list_add(&priv->lhead, &dev->filelist); |
30e2fb18 | 303 | mutex_unlock(&dev->struct_mutex); |
d985c108 DA |
304 | |
305 | #ifdef __alpha__ | |
306 | /* | |
307 | * Default the hose | |
308 | */ | |
309 | if (!dev->hose) { | |
310 | struct pci_dev *pci_dev; | |
311 | pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); | |
312 | if (pci_dev) { | |
313 | dev->hose = pci_dev->sysdata; | |
314 | pci_dev_put(pci_dev); | |
315 | } | |
316 | if (!dev->hose) { | |
317 | struct pci_bus *b = pci_bus_b(pci_root_buses.next); | |
318 | if (b) | |
319 | dev->hose = b->sysdata; | |
320 | } | |
321 | } | |
322 | #endif | |
323 | ||
324 | return 0; | |
325 | out_free: | |
326 | drm_free(priv, sizeof(*priv), DRM_MEM_FILES); | |
327 | filp->private_data = NULL; | |
328 | return ret; | |
329 | } | |
330 | ||
331 | /** No-op. */ | |
332 | int drm_fasync(int fd, struct file *filp, int on) | |
333 | { | |
84b1fd10 | 334 | struct drm_file *priv = filp->private_data; |
2c14f28b | 335 | struct drm_device *dev = priv->minor->dev; |
d985c108 DA |
336 | int retcode; |
337 | ||
338 | DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, | |
2c14f28b | 339 | (long)old_encode_dev(priv->minor->device)); |
d985c108 DA |
340 | retcode = fasync_helper(fd, filp, on, &dev->buf_async); |
341 | if (retcode < 0) | |
342 | return retcode; | |
343 | return 0; | |
344 | } | |
345 | EXPORT_SYMBOL(drm_fasync); | |
346 | ||
7c1c2871 DA |
347 | /* |
348 | * Reclaim locked buffers; note that this may be a bad idea if the current | |
349 | * context doesn't have the hw lock... | |
350 | */ | |
351 | static void drm_reclaim_locked_buffers(struct drm_device *dev, struct file *f) | |
352 | { | |
353 | struct drm_file *file_priv = f->private_data; | |
354 | ||
355 | if (drm_i_have_hw_lock(dev, file_priv)) { | |
356 | dev->driver->reclaim_buffers_locked(dev, file_priv); | |
357 | } else { | |
358 | unsigned long _end = jiffies + 3 * DRM_HZ; | |
359 | int locked = 0; | |
360 | ||
361 | drm_idlelock_take(&file_priv->master->lock); | |
362 | ||
363 | /* | |
364 | * Wait for a while. | |
365 | */ | |
366 | do { | |
367 | spin_lock_bh(&file_priv->master->lock.spinlock); | |
368 | locked = file_priv->master->lock.idle_has_lock; | |
369 | spin_unlock_bh(&file_priv->master->lock.spinlock); | |
370 | if (locked) | |
371 | break; | |
372 | schedule(); | |
373 | } while (!time_after_eq(jiffies, _end)); | |
374 | ||
375 | if (!locked) { | |
376 | DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n" | |
377 | "\tdriver to use reclaim_buffers_idlelocked() instead.\n" | |
378 | "\tI will go on reclaiming the buffers anyway.\n"); | |
379 | } | |
380 | ||
381 | dev->driver->reclaim_buffers_locked(dev, file_priv); | |
382 | drm_idlelock_release(&file_priv->master->lock); | |
383 | } | |
384 | } | |
385 | ||
386 | static void drm_master_release(struct drm_device *dev, struct file *filp) | |
387 | { | |
388 | struct drm_file *file_priv = filp->private_data; | |
389 | ||
390 | if (dev->driver->reclaim_buffers_locked && | |
391 | file_priv->master->lock.hw_lock) | |
392 | drm_reclaim_locked_buffers(dev, filp); | |
393 | ||
394 | if (dev->driver->reclaim_buffers_idlelocked && | |
395 | file_priv->master->lock.hw_lock) { | |
396 | drm_idlelock_take(&file_priv->master->lock); | |
397 | dev->driver->reclaim_buffers_idlelocked(dev, file_priv); | |
398 | drm_idlelock_release(&file_priv->master->lock); | |
399 | } | |
400 | ||
401 | ||
402 | if (drm_i_have_hw_lock(dev, file_priv)) { | |
403 | DRM_DEBUG("File %p released, freeing lock for context %d\n", | |
404 | filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); | |
405 | drm_lock_free(&file_priv->master->lock, | |
406 | _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock)); | |
407 | } | |
408 | ||
409 | if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && | |
410 | !dev->driver->reclaim_buffers_locked) { | |
411 | dev->driver->reclaim_buffers(dev, file_priv); | |
412 | } | |
413 | } | |
414 | ||
1da177e4 LT |
415 | /** |
416 | * Release file. | |
417 | * | |
418 | * \param inode device inode | |
6c340eac | 419 | * \param file_priv DRM file private. |
1da177e4 LT |
420 | * \return zero on success or a negative number on failure. |
421 | * | |
422 | * If the hardware lock is held then free it, and take it again for the kernel | |
423 | * context since it's necessary to reclaim buffers. Unlink the file private | |
424 | * data from its list and free it. Decreases the open count and if it reaches | |
22eae947 | 425 | * zero calls drm_lastclose(). |
1da177e4 | 426 | */ |
b5e89ed5 | 427 | int drm_release(struct inode *inode, struct file *filp) |
1da177e4 | 428 | { |
6c340eac | 429 | struct drm_file *file_priv = filp->private_data; |
2c14f28b | 430 | struct drm_device *dev = file_priv->minor->dev; |
1da177e4 LT |
431 | int retcode = 0; |
432 | ||
433 | lock_kernel(); | |
1da177e4 | 434 | |
b5e89ed5 | 435 | DRM_DEBUG("open_count = %d\n", dev->open_count); |
1da177e4 | 436 | |
22eae947 | 437 | if (dev->driver->preclose) |
6c340eac | 438 | dev->driver->preclose(dev, file_priv); |
1da177e4 LT |
439 | |
440 | /* ======================================================== | |
441 | * Begin inline drm_release | |
442 | */ | |
443 | ||
b5e89ed5 | 444 | DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
ba25f9dc | 445 | task_pid_nr(current), |
2c14f28b | 446 | (long)old_encode_dev(file_priv->minor->device), |
b5e89ed5 DA |
447 | dev->open_count); |
448 | ||
7c1c2871 DA |
449 | /* if the master has gone away we can't do anything with the lock */ |
450 | if (file_priv->minor->master) | |
451 | drm_master_release(dev, filp); | |
1da177e4 | 452 | |
673a394b EA |
453 | if (dev->driver->driver_features & DRIVER_GEM) |
454 | drm_gem_release(dev, file_priv); | |
455 | ||
30e2fb18 | 456 | mutex_lock(&dev->ctxlist_mutex); |
bd1b331f | 457 | if (!list_empty(&dev->ctxlist)) { |
55910517 | 458 | struct drm_ctx_list *pos, *n; |
1da177e4 | 459 | |
bd1b331f | 460 | list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
6c340eac | 461 | if (pos->tag == file_priv && |
b5e89ed5 | 462 | pos->handle != DRM_KERNEL_CONTEXT) { |
1da177e4 | 463 | if (dev->driver->context_dtor) |
b5e89ed5 DA |
464 | dev->driver->context_dtor(dev, |
465 | pos->handle); | |
1da177e4 | 466 | |
b5e89ed5 | 467 | drm_ctxbitmap_free(dev, pos->handle); |
1da177e4 | 468 | |
b5e89ed5 DA |
469 | list_del(&pos->head); |
470 | drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); | |
1da177e4 LT |
471 | --dev->ctx_count; |
472 | } | |
473 | } | |
474 | } | |
30e2fb18 | 475 | mutex_unlock(&dev->ctxlist_mutex); |
1da177e4 | 476 | |
30e2fb18 | 477 | mutex_lock(&dev->struct_mutex); |
7c1c2871 DA |
478 | |
479 | if (file_priv->is_master) { | |
84b1fd10 | 480 | struct drm_file *temp; |
7c1c2871 DA |
481 | list_for_each_entry(temp, &dev->filelist, lhead) { |
482 | if ((temp->master == file_priv->master) && | |
483 | (temp != file_priv)) | |
484 | temp->authenticated = 0; | |
485 | } | |
bd1b331f | 486 | |
7c1c2871 DA |
487 | if (file_priv->minor->master == file_priv->master) { |
488 | /* drop the reference held my the minor */ | |
489 | drm_master_put(&file_priv->minor->master); | |
490 | } | |
1da177e4 | 491 | } |
7c1c2871 DA |
492 | |
493 | /* drop the reference held my the file priv */ | |
494 | drm_master_put(&file_priv->master); | |
495 | file_priv->is_master = 0; | |
6c340eac | 496 | list_del(&file_priv->lhead); |
30e2fb18 | 497 | mutex_unlock(&dev->struct_mutex); |
b5e89ed5 | 498 | |
22eae947 | 499 | if (dev->driver->postclose) |
6c340eac EA |
500 | dev->driver->postclose(dev, file_priv); |
501 | drm_free(file_priv, sizeof(*file_priv), DRM_MEM_FILES); | |
1da177e4 LT |
502 | |
503 | /* ======================================================== | |
504 | * End inline drm_release | |
505 | */ | |
506 | ||
b5e89ed5 DA |
507 | atomic_inc(&dev->counts[_DRM_STAT_CLOSES]); |
508 | spin_lock(&dev->count_lock); | |
509 | if (!--dev->open_count) { | |
7c1c2871 DA |
510 | if (atomic_read(&dev->ioctl_count)) { |
511 | DRM_ERROR("Device busy: %d\n", | |
512 | atomic_read(&dev->ioctl_count)); | |
b5e89ed5 | 513 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
514 | unlock_kernel(); |
515 | return -EBUSY; | |
516 | } | |
b5e89ed5 | 517 | spin_unlock(&dev->count_lock); |
1da177e4 | 518 | unlock_kernel(); |
22eae947 | 519 | return drm_lastclose(dev); |
1da177e4 | 520 | } |
b5e89ed5 | 521 | spin_unlock(&dev->count_lock); |
1da177e4 LT |
522 | |
523 | unlock_kernel(); | |
524 | ||
525 | return retcode; | |
526 | } | |
527 | EXPORT_SYMBOL(drm_release); | |
528 | ||
1da177e4 LT |
529 | /** No-op. */ |
530 | unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) | |
531 | { | |
532 | return 0; | |
533 | } | |
b5e89ed5 | 534 | EXPORT_SYMBOL(drm_poll); |