/* * Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Author Rickard E. (Rik) Faith <faith@valinux.com> * Author Gareth Hughes <gareth@valinux.com> * * 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 <drm/drmP.h> #include "drm_internal.h" /** * drm_getmagic - Get unique magic of a client * @dev: DRM device to operate on * @data: ioctl data containing the drm_auth object * @file_priv: DRM file that performs the operation * * This looks up the unique magic of the passed client and returns it. If the * client did not have a magic assigned, yet, a new one is registered. The magic * is stored in the passed drm_auth object. * * Returns: 0 on success, negative error code on failure. */ int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct drm_auth *auth = data; int ret = 0; mutex_lock(&dev->struct_mutex); if (!file_priv->magic) { ret = idr_alloc(&file_priv->master->magic_map, file_priv, 1, 0, GFP_KERNEL); if (ret >= 0) file_priv->magic = ret; } auth->magic = file_priv->magic; mutex_unlock(&dev->struct_mutex); DRM_DEBUG("%u\n", auth->magic); return ret < 0 ? ret : 0; } /** * drm_authmagic - Authenticate client with a magic * @dev: DRM device to operate on * @data: ioctl data containing the drm_auth object * @file_priv: DRM file that performs the operation * * This looks up a DRM client by the passed magic and authenticates it. * * Returns: 0 on success, negative error code on failure. */ 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); mutex_lock(&dev->struct_mutex); file = idr_find(&file_priv->master->magic_map, auth->magic); if (file) { file->authenticated = 1; idr_replace(&file_priv->master->magic_map, NULL, auth->magic); } mutex_unlock(&dev->struct_mutex); return file ? 0 : -EINVAL; }