diff options
Diffstat (limited to 'drivers/char/drm/drm_auth.c')
| -rw-r--r-- | drivers/char/drm/drm_auth.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/drivers/char/drm/drm_auth.c b/drivers/char/drm/drm_auth.c deleted file mode 100644 index a73462723d2d..000000000000 --- a/drivers/char/drm/drm_auth.c +++ /dev/null @@ -1,190 +0,0 @@ -/** - * \file drm_auth.c - * IOCTLs for authentication - * - * \author Rickard E. (Rik) Faith <[email protected]> - * \author Gareth Hughes <[email protected]> - */ - -/* - * Created: Tue Feb 2 08:37:54 1999 by [email protected] - * - * 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 - * VA LINUX SYSTEMS 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. - */ - -#include "drmP.h" - -/** - * Find the file with the given magic number. - * - * \param dev DRM device. - * \param magic magic number. - * - * Searches in drm_device::magiclist within all files with the same hash key - * the one with matching magic number, while holding the drm_device::struct_mutex - * lock. - */ -static struct drm_file *drm_find_file(struct drm_device * dev, drm_magic_t magic) -{ - struct drm_file *retval = NULL; - struct drm_magic_entry *pt; - struct drm_hash_item *hash; - - mutex_lock(&dev->struct_mutex); - if (!drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) { - pt = drm_hash_entry(hash, struct drm_magic_entry, hash_item); - retval = pt->priv; - } - mutex_unlock(&dev->struct_mutex); - return retval; -} - -/** - * Adds a magic number. - * - * \param dev DRM device. - * \param priv file private data. - * \param magic magic number. - * - * Creates a drm_magic_entry structure and appends to the linked list - * associated the magic number hash key in drm_device::magiclist, while holding - * the drm_device::struct_mutex lock. - */ -static int drm_add_magic(struct drm_device * dev, struct drm_file * priv, - drm_magic_t magic) -{ - struct drm_magic_entry *entry; - - DRM_DEBUG("%d\n", magic); - - entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC); - if (!entry) - return -ENOMEM; - memset(entry, 0, sizeof(*entry)); - entry->priv = priv; - - entry->hash_item.key = (unsigned long)magic; - mutex_lock(&dev->struct_mutex); - drm_ht_insert_item(&dev->magiclist, &entry->hash_item); - list_add_tail(&entry->head, &dev->magicfree); - mutex_unlock(&dev->struct_mutex); - - return 0; -} - -/** - * Remove a magic number. - * - * \param dev DRM device. - * \param magic magic number. - * - * Searches and unlinks the entry in drm_device::magiclist with the magic - * number hash key, while holding the drm_device::struct_mutex lock. - */ -static int drm_remove_magic(struct drm_device * dev, drm_magic_t magic) -{ - struct drm_magic_entry *pt; - struct drm_hash_item *hash; - - DRM_DEBUG("%d\n", magic); - - mutex_lock(&dev->struct_mutex); - if (drm_ht_find_item(&dev->magiclist, (unsigned long)magic, &hash)) { - mutex_unlock(&dev->struct_mutex); - return -EINVAL; - } - pt = drm_hash_entry(hash, struct drm_magic_entry, hash_item); - drm_ht_remove_item(&dev->magiclist, hash); - list_del(&pt->head); - mutex_unlock(&dev->struct_mutex); - - drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC); - - return 0; -} - -/** - * Get a unique magic number (ioctl). - * - * \param inode device inode. - * \param file_priv DRM file private. - * \param cmd command. - * \param arg pointer to a resulting drm_auth structure. - * \return zero on success, or a negative number on failure. - * - * If there is a magic number in drm_file::magic then use it, otherwise - * searches an unique non-zero magic number and add it associating it with \p - * file_priv. - */ -int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv) -{ - static drm_magic_t sequence = 0; - static DEFINE_SPINLOCK(lock); - struct drm_auth *auth = data; - - /* Find unique magic */ - if (file_priv->magic) { - auth->magic = file_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)); - file_priv->magic = auth->magic; - drm_add_magic(dev, file_priv, auth->magic); - } - - DRM_DEBUG("%u\n", auth->magic); - - return 0; -} - -/** - * Authenticate with a magic. - * - * \param inode device inode. - * \param file_priv DRM file private. - * \param cmd command. - * \param arg pointer to a drm_auth structure. - * \return zero if authentication successed, or a negative number otherwise. - * - * Checks if \p file_priv is associated with the magic number passed in \arg. - */ -int drm_authmagic(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_auth *auth = data; - struct drm_file *file; - - 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; -} |