patch-2.4.8 linux/drivers/char/drm/auth.c
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- Lines: 163
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.4.7/linux/drivers/char/drm/auth.c
- Orig date:
Tue Aug 29 14:09:15 2000
diff -u --recursive --new-file v2.4.7/linux/drivers/char/drm/auth.c linux/drivers/char/drm/auth.c
@@ -1,162 +0,0 @@
-/* auth.c -- IOCTLs for authentication -*- linux-c -*-
- * Created: Tue Feb 2 08:37:54 1999 by faith@precisioninsight.com
- *
- * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
- * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- *
- * Authors:
- * Rickard E. (Rik) Faith <faith@valinux.com>
- *
- */
-
-#define __NO_VERSION__
-#include "drmP.h"
-
-static int drm_hash_magic(drm_magic_t magic)
-{
- return magic & (DRM_HASH_SIZE-1);
-}
-
-static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic)
-{
- drm_file_t *retval = NULL;
- drm_magic_entry_t *pt;
- int hash = drm_hash_magic(magic);
-
- down(&dev->struct_sem);
- for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
- if (pt->magic == magic) {
- retval = pt->priv;
- break;
- }
- }
- up(&dev->struct_sem);
- return retval;
-}
-
-int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
-{
- int hash;
- drm_magic_entry_t *entry;
-
- DRM_DEBUG("%d\n", magic);
-
- hash = drm_hash_magic(magic);
- entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC);
- if (!entry) return -ENOMEM;
- entry->magic = magic;
- entry->priv = priv;
- entry->next = NULL;
-
- down(&dev->struct_sem);
- if (dev->magiclist[hash].tail) {
- dev->magiclist[hash].tail->next = entry;
- dev->magiclist[hash].tail = entry;
- } else {
- dev->magiclist[hash].head = entry;
- dev->magiclist[hash].tail = entry;
- }
- up(&dev->struct_sem);
-
- return 0;
-}
-
-int drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
-{
- drm_magic_entry_t *prev = NULL;
- drm_magic_entry_t *pt;
- int hash;
-
- DRM_DEBUG("%d\n", magic);
- hash = drm_hash_magic(magic);
-
- down(&dev->struct_sem);
- for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
- if (pt->magic == magic) {
- if (dev->magiclist[hash].head == pt) {
- dev->magiclist[hash].head = pt->next;
- }
- if (dev->magiclist[hash].tail == pt) {
- dev->magiclist[hash].tail = prev;
- }
- if (prev) {
- prev->next = pt->next;
- }
- up(&dev->struct_sem);
- return 0;
- }
- }
- up(&dev->struct_sem);
-
- drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
-
- return -EINVAL;
-}
-
-int drm_getmagic(struct inode *inode, struct file *filp, unsigned int cmd,
- unsigned long arg)
-{
- static drm_magic_t sequence = 0;
- static spinlock_t lock = SPIN_LOCK_UNLOCKED;
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_auth_t auth;
-
- /* Find unique magic */
- if (priv->magic) {
- auth.magic = priv->magic;
- } else {
- do {
- spin_lock(&lock);
- if (!sequence) ++sequence; /* reserve 0 */
- auth.magic = sequence++;
- spin_unlock(&lock);
- } while (drm_find_file(dev, auth.magic));
- priv->magic = auth.magic;
- drm_add_magic(dev, priv, auth.magic);
- }
-
- DRM_DEBUG("%u\n", auth.magic);
- if (copy_to_user((drm_auth_t *)arg, &auth, sizeof(auth)))
- return -EFAULT;
- return 0;
-}
-
-int drm_authmagic(struct inode *inode, struct file *filp, unsigned int cmd,
- unsigned long arg)
-{
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_auth_t auth;
- drm_file_t *file;
-
- if (copy_from_user(&auth, (drm_auth_t *)arg, sizeof(auth)))
- return -EFAULT;
- DRM_DEBUG("%u\n", auth.magic);
- if ((file = drm_find_file(dev, auth.magic))) {
- file->authenticated = 1;
- drm_remove_magic(dev, auth.magic);
- return 0;
- }
- return -EINVAL;
-}
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