[PATCH] IB uverbs: core implementation
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / infiniband / core / uverbs_main.c
CommitLineData
bc38a6ab
RD
1/*
2 * Copyright (c) 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Cisco Systems. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 *
33 * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
34 */
35
36#include <linux/module.h>
37#include <linux/init.h>
38#include <linux/device.h>
39#include <linux/err.h>
40#include <linux/fs.h>
41#include <linux/poll.h>
42#include <linux/file.h>
43#include <linux/mount.h>
44
45#include <asm/uaccess.h>
46
47#include "uverbs.h"
48
49MODULE_AUTHOR("Roland Dreier");
50MODULE_DESCRIPTION("InfiniBand userspace verbs access");
51MODULE_LICENSE("Dual BSD/GPL");
52
53#define INFINIBANDEVENTFS_MAGIC 0x49426576 /* "IBev" */
54
55enum {
56 IB_UVERBS_MAJOR = 231,
57 IB_UVERBS_BASE_MINOR = 192,
58 IB_UVERBS_MAX_DEVICES = 32
59};
60
61#define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
62
63DECLARE_MUTEX(ib_uverbs_idr_mutex);
64DEFINE_IDR(ib_uverbs_pd_idr);
65DEFINE_IDR(ib_uverbs_mr_idr);
66DEFINE_IDR(ib_uverbs_mw_idr);
67DEFINE_IDR(ib_uverbs_ah_idr);
68DEFINE_IDR(ib_uverbs_cq_idr);
69DEFINE_IDR(ib_uverbs_qp_idr);
70
71static spinlock_t map_lock;
72static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
73
74static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
75 const char __user *buf, int in_len,
76 int out_len) = {
77 [IB_USER_VERBS_CMD_QUERY_PARAMS] = ib_uverbs_query_params,
78 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
79 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
80 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
81 [IB_USER_VERBS_CMD_QUERY_GID] = ib_uverbs_query_gid,
82 [IB_USER_VERBS_CMD_QUERY_PKEY] = ib_uverbs_query_pkey,
83 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
84 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
85 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
86 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
87 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
88 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
89 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
90 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
91 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
92 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
93 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
94};
95
96static struct vfsmount *uverbs_event_mnt;
97
98static void ib_uverbs_add_one(struct ib_device *device);
99static void ib_uverbs_remove_one(struct ib_device *device);
100
101static int ib_dealloc_ucontext(struct ib_ucontext *context)
102{
103 struct ib_uobject *uobj, *tmp;
104
105 if (!context)
106 return 0;
107
108 down(&ib_uverbs_idr_mutex);
109
110 /* XXX Free AHs */
111
112 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
113 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
114 idr_remove(&ib_uverbs_qp_idr, uobj->id);
115 ib_destroy_qp(qp);
116 list_del(&uobj->list);
117 kfree(uobj);
118 }
119
120 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
121 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
122 idr_remove(&ib_uverbs_cq_idr, uobj->id);
123 ib_destroy_cq(cq);
124 list_del(&uobj->list);
125 kfree(uobj);
126 }
127
128 /* XXX Free SRQs */
129 /* XXX Free MWs */
130
131 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
132 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
133 struct ib_umem_object *memobj;
134
135 idr_remove(&ib_uverbs_mr_idr, uobj->id);
136 ib_dereg_mr(mr);
137
138 memobj = container_of(uobj, struct ib_umem_object, uobject);
139 ib_umem_release_on_close(mr->device, &memobj->umem);
140
141 list_del(&uobj->list);
142 kfree(memobj);
143 }
144
145 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
146 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
147 idr_remove(&ib_uverbs_pd_idr, uobj->id);
148 ib_dealloc_pd(pd);
149 list_del(&uobj->list);
150 kfree(uobj);
151 }
152
153 up(&ib_uverbs_idr_mutex);
154
155 return context->device->dealloc_ucontext(context);
156}
157
158static void ib_uverbs_release_file(struct kref *ref)
159{
160 struct ib_uverbs_file *file =
161 container_of(ref, struct ib_uverbs_file, ref);
162
163 module_put(file->device->ib_dev->owner);
164 kfree(file);
165}
166
167static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
168 size_t count, loff_t *pos)
169{
170 struct ib_uverbs_event_file *file = filp->private_data;
171 void *event;
172 int eventsz;
173 int ret = 0;
174
175 spin_lock_irq(&file->lock);
176
177 while (list_empty(&file->event_list) && file->fd >= 0) {
178 spin_unlock_irq(&file->lock);
179
180 if (filp->f_flags & O_NONBLOCK)
181 return -EAGAIN;
182
183 if (wait_event_interruptible(file->poll_wait,
184 !list_empty(&file->event_list) ||
185 file->fd < 0))
186 return -ERESTARTSYS;
187
188 spin_lock_irq(&file->lock);
189 }
190
191 if (file->fd < 0) {
192 spin_unlock_irq(&file->lock);
193 return -ENODEV;
194 }
195
196 if (file->is_async) {
197 event = list_entry(file->event_list.next,
198 struct ib_uverbs_async_event, list);
199 eventsz = sizeof (struct ib_uverbs_async_event_desc);
200 } else {
201 event = list_entry(file->event_list.next,
202 struct ib_uverbs_comp_event, list);
203 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
204 }
205
206 if (eventsz > count) {
207 ret = -EINVAL;
208 event = NULL;
209 } else
210 list_del(file->event_list.next);
211
212 spin_unlock_irq(&file->lock);
213
214 if (event) {
215 if (copy_to_user(buf, event, eventsz))
216 ret = -EFAULT;
217 else
218 ret = eventsz;
219 }
220
221 kfree(event);
222
223 return ret;
224}
225
226static unsigned int ib_uverbs_event_poll(struct file *filp,
227 struct poll_table_struct *wait)
228{
229 unsigned int pollflags = 0;
230 struct ib_uverbs_event_file *file = filp->private_data;
231
232 poll_wait(filp, &file->poll_wait, wait);
233
234 spin_lock_irq(&file->lock);
235 if (file->fd < 0)
236 pollflags = POLLERR;
237 else if (!list_empty(&file->event_list))
238 pollflags = POLLIN | POLLRDNORM;
239 spin_unlock_irq(&file->lock);
240
241 return pollflags;
242}
243
244static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
245{
246 struct list_head *entry, *tmp;
247
248 spin_lock_irq(&file->lock);
249 if (file->fd != -1) {
250 file->fd = -1;
251 list_for_each_safe(entry, tmp, &file->event_list)
252 if (file->is_async)
253 kfree(list_entry(entry, struct ib_uverbs_async_event, list));
254 else
255 kfree(list_entry(entry, struct ib_uverbs_comp_event, list));
256 }
257 spin_unlock_irq(&file->lock);
258}
259
260static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
261{
262 struct ib_uverbs_event_file *file = filp->private_data;
263
264 ib_uverbs_event_release(file);
265 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
266
267 return 0;
268}
269
270static struct file_operations uverbs_event_fops = {
271 /*
272 * No .owner field since we artificially create event files,
273 * so there is no increment to the module reference count in
274 * the open path. All event files come from a uverbs command
275 * file, which already takes a module reference, so this is OK.
276 */
277 .read = ib_uverbs_event_read,
278 .poll = ib_uverbs_event_poll,
279 .release = ib_uverbs_event_close
280};
281
282void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
283{
284 struct ib_uverbs_file *file = cq_context;
285 struct ib_uverbs_comp_event *entry;
286 unsigned long flags;
287
288 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
289 if (!entry)
290 return;
291
292 entry->desc.cq_handle = cq->uobject->user_handle;
293
294 spin_lock_irqsave(&file->comp_file[0].lock, flags);
295 list_add_tail(&entry->list, &file->comp_file[0].event_list);
296 spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
297
298 wake_up_interruptible(&file->comp_file[0].poll_wait);
299}
300
301static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
302 __u64 element, __u64 event)
303{
304 struct ib_uverbs_async_event *entry;
305 unsigned long flags;
306
307 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
308 if (!entry)
309 return;
310
311 entry->desc.element = element;
312 entry->desc.event_type = event;
313
314 spin_lock_irqsave(&file->async_file.lock, flags);
315 list_add_tail(&entry->list, &file->async_file.event_list);
316 spin_unlock_irqrestore(&file->async_file.lock, flags);
317
318 wake_up_interruptible(&file->async_file.poll_wait);
319}
320
321void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
322{
323 ib_uverbs_async_handler(context_ptr,
324 event->element.cq->uobject->user_handle,
325 event->event);
326}
327
328void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
329{
330 ib_uverbs_async_handler(context_ptr,
331 event->element.qp->uobject->user_handle,
332 event->event);
333}
334
335static void ib_uverbs_event_handler(struct ib_event_handler *handler,
336 struct ib_event *event)
337{
338 struct ib_uverbs_file *file =
339 container_of(handler, struct ib_uverbs_file, event_handler);
340
341 ib_uverbs_async_handler(file, event->element.port_num, event->event);
342}
343
344static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
345 struct ib_uverbs_file *uverbs_file)
346{
347 struct file *filp;
348
349 spin_lock_init(&file->lock);
350 INIT_LIST_HEAD(&file->event_list);
351 init_waitqueue_head(&file->poll_wait);
352 file->uverbs_file = uverbs_file;
353
354 file->fd = get_unused_fd();
355 if (file->fd < 0)
356 return file->fd;
357
358 filp = get_empty_filp();
359 if (!filp) {
360 put_unused_fd(file->fd);
361 return -ENFILE;
362 }
363
364 filp->f_op = &uverbs_event_fops;
365 filp->f_vfsmnt = mntget(uverbs_event_mnt);
366 filp->f_dentry = dget(uverbs_event_mnt->mnt_root);
367 filp->f_mapping = filp->f_dentry->d_inode->i_mapping;
368 filp->f_flags = O_RDONLY;
369 filp->f_mode = FMODE_READ;
370 filp->private_data = file;
371
372 fd_install(file->fd, filp);
373
374 return 0;
375}
376
377static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
378 size_t count, loff_t *pos)
379{
380 struct ib_uverbs_file *file = filp->private_data;
381 struct ib_uverbs_cmd_hdr hdr;
382
383 if (count < sizeof hdr)
384 return -EINVAL;
385
386 if (copy_from_user(&hdr, buf, sizeof hdr))
387 return -EFAULT;
388
389 if (hdr.in_words * 4 != count)
390 return -EINVAL;
391
392 if (hdr.command < 0 || hdr.command >= ARRAY_SIZE(uverbs_cmd_table))
393 return -EINVAL;
394
395 if (!file->ucontext &&
396 hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
397 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
398 return -EINVAL;
399
400 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
401 hdr.in_words * 4, hdr.out_words * 4);
402}
403
404static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
405{
406 struct ib_uverbs_file *file = filp->private_data;
407
408 if (!file->ucontext)
409 return -ENODEV;
410 else
411 return file->device->ib_dev->mmap(file->ucontext, vma);
412}
413
414static int ib_uverbs_open(struct inode *inode, struct file *filp)
415{
416 struct ib_uverbs_device *dev =
417 container_of(inode->i_cdev, struct ib_uverbs_device, dev);
418 struct ib_uverbs_file *file;
419 int i = 0;
420 int ret;
421
422 if (!try_module_get(dev->ib_dev->owner))
423 return -ENODEV;
424
425 file = kmalloc(sizeof *file +
426 (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
427 GFP_KERNEL);
428 if (!file)
429 return -ENOMEM;
430
431 file->device = dev;
432 kref_init(&file->ref);
433
434 file->ucontext = NULL;
435
436 ret = ib_uverbs_event_init(&file->async_file, file);
437 if (ret)
438 goto err;
439
440 file->async_file.is_async = 1;
441
442 kref_get(&file->ref);
443
444 for (i = 0; i < dev->num_comp; ++i) {
445 ret = ib_uverbs_event_init(&file->comp_file[i], file);
446 if (ret)
447 goto err_async;
448 kref_get(&file->ref);
449 file->comp_file[i].is_async = 0;
450 }
451
452
453 filp->private_data = file;
454
455 INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
456 ib_uverbs_event_handler);
457 if (ib_register_event_handler(&file->event_handler))
458 goto err_async;
459
460 return 0;
461
462err_async:
463 while (i--)
464 ib_uverbs_event_release(&file->comp_file[i]);
465
466 ib_uverbs_event_release(&file->async_file);
467
468err:
469 kref_put(&file->ref, ib_uverbs_release_file);
470
471 return ret;
472}
473
474static int ib_uverbs_close(struct inode *inode, struct file *filp)
475{
476 struct ib_uverbs_file *file = filp->private_data;
477 int i;
478
479 ib_unregister_event_handler(&file->event_handler);
480 ib_uverbs_event_release(&file->async_file);
481 ib_dealloc_ucontext(file->ucontext);
482
483 for (i = 0; i < file->device->num_comp; ++i)
484 ib_uverbs_event_release(&file->comp_file[i]);
485
486 kref_put(&file->ref, ib_uverbs_release_file);
487
488 return 0;
489}
490
491static struct file_operations uverbs_fops = {
492 .owner = THIS_MODULE,
493 .write = ib_uverbs_write,
494 .open = ib_uverbs_open,
495 .release = ib_uverbs_close
496};
497
498static struct file_operations uverbs_mmap_fops = {
499 .owner = THIS_MODULE,
500 .write = ib_uverbs_write,
501 .mmap = ib_uverbs_mmap,
502 .open = ib_uverbs_open,
503 .release = ib_uverbs_close
504};
505
506static struct ib_client uverbs_client = {
507 .name = "uverbs",
508 .add = ib_uverbs_add_one,
509 .remove = ib_uverbs_remove_one
510};
511
512static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
513{
514 struct ib_uverbs_device *dev =
515 container_of(class_dev, struct ib_uverbs_device, class_dev);
516
517 return sprintf(buf, "%s\n", dev->ib_dev->name);
518}
519static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
520
521static void ib_uverbs_release_class_dev(struct class_device *class_dev)
522{
523 struct ib_uverbs_device *dev =
524 container_of(class_dev, struct ib_uverbs_device, class_dev);
525
526 cdev_del(&dev->dev);
527 clear_bit(dev->devnum, dev_map);
528 kfree(dev);
529}
530
531static struct class uverbs_class = {
532 .name = "infiniband_verbs",
533 .release = ib_uverbs_release_class_dev
534};
535
536static ssize_t show_abi_version(struct class *class, char *buf)
537{
538 return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
539}
540static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
541
542static void ib_uverbs_add_one(struct ib_device *device)
543{
544 struct ib_uverbs_device *uverbs_dev;
545
546 if (!device->alloc_ucontext)
547 return;
548
549 uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
550 if (!uverbs_dev)
551 return;
552
553 memset(uverbs_dev, 0, sizeof *uverbs_dev);
554
555 spin_lock(&map_lock);
556 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
557 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
558 spin_unlock(&map_lock);
559 goto err;
560 }
561 set_bit(uverbs_dev->devnum, dev_map);
562 spin_unlock(&map_lock);
563
564 uverbs_dev->ib_dev = device;
565 uverbs_dev->num_comp = 1;
566
567 if (device->mmap)
568 cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
569 else
570 cdev_init(&uverbs_dev->dev, &uverbs_fops);
571 uverbs_dev->dev.owner = THIS_MODULE;
572 kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
573 if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
574 goto err;
575
576 uverbs_dev->class_dev.class = &uverbs_class;
577 uverbs_dev->class_dev.dev = device->dma_device;
578 uverbs_dev->class_dev.devt = uverbs_dev->dev.dev;
579 snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
580 if (class_device_register(&uverbs_dev->class_dev))
581 goto err_cdev;
582
583 if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
584 goto err_class;
585
586 ib_set_client_data(device, &uverbs_client, uverbs_dev);
587
588 return;
589
590err_class:
591 class_device_unregister(&uverbs_dev->class_dev);
592
593err_cdev:
594 cdev_del(&uverbs_dev->dev);
595 clear_bit(uverbs_dev->devnum, dev_map);
596
597err:
598 kfree(uverbs_dev);
599 return;
600}
601
602static void ib_uverbs_remove_one(struct ib_device *device)
603{
604 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
605
606 if (!uverbs_dev)
607 return;
608
609 class_device_unregister(&uverbs_dev->class_dev);
610}
611
612static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
613 const char *dev_name, void *data)
614{
615 return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
616 INFINIBANDEVENTFS_MAGIC);
617}
618
619static struct file_system_type uverbs_event_fs = {
620 /* No owner field so module can be unloaded */
621 .name = "infinibandeventfs",
622 .get_sb = uverbs_event_get_sb,
623 .kill_sb = kill_litter_super
624};
625
626static int __init ib_uverbs_init(void)
627{
628 int ret;
629
630 spin_lock_init(&map_lock);
631
632 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
633 "infiniband_verbs");
634 if (ret) {
635 printk(KERN_ERR "user_verbs: couldn't register device number\n");
636 goto out;
637 }
638
639 ret = class_register(&uverbs_class);
640 if (ret) {
641 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
642 goto out_chrdev;
643 }
644
645 ret = class_create_file(&uverbs_class, &class_attr_abi_version);
646 if (ret) {
647 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
648 goto out_class;
649 }
650
651 ret = register_filesystem(&uverbs_event_fs);
652 if (ret) {
653 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
654 goto out_class;
655 }
656
657 uverbs_event_mnt = kern_mount(&uverbs_event_fs);
658 if (IS_ERR(uverbs_event_mnt)) {
659 ret = PTR_ERR(uverbs_event_mnt);
660 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
661 goto out_fs;
662 }
663
664 ret = ib_register_client(&uverbs_client);
665 if (ret) {
666 printk(KERN_ERR "user_verbs: couldn't register client\n");
667 goto out_mnt;
668 }
669
670 return 0;
671
672out_mnt:
673 mntput(uverbs_event_mnt);
674
675out_fs:
676 unregister_filesystem(&uverbs_event_fs);
677
678out_class:
679 class_unregister(&uverbs_class);
680
681out_chrdev:
682 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
683
684out:
685 return ret;
686}
687
688static void __exit ib_uverbs_cleanup(void)
689{
690 ib_unregister_client(&uverbs_client);
691 mntput(uverbs_event_mnt);
692 unregister_filesystem(&uverbs_event_fs);
693 class_unregister(&uverbs_class);
694 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
695}
696
697module_init(ib_uverbs_init);
698module_exit(ib_uverbs_cleanup);