mirror of https://gitee.com/openkylin/linux.git
94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/*
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* Created: Tue Feb 2 08:37:54 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Author Rickard E. (Rik) Faith <faith@valinux.com>
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* Author Gareth Hughes <gareth@valinux.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include "drm_internal.h"
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/**
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* drm_getmagic - Get unique magic of a client
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* @dev: DRM device to operate on
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* @data: ioctl data containing the drm_auth object
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* @file_priv: DRM file that performs the operation
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*
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* This looks up the unique magic of the passed client and returns it. If the
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* client did not have a magic assigned, yet, a new one is registered. The magic
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* is stored in the passed drm_auth object.
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*
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* Returns: 0 on success, negative error code on failure.
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*/
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int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_auth *auth = data;
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int ret = 0;
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mutex_lock(&dev->struct_mutex);
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if (!file_priv->magic) {
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ret = idr_alloc(&file_priv->master->magic_map, file_priv,
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1, 0, GFP_KERNEL);
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if (ret >= 0)
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file_priv->magic = ret;
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}
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auth->magic = file_priv->magic;
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mutex_unlock(&dev->struct_mutex);
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DRM_DEBUG("%u\n", auth->magic);
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return ret < 0 ? ret : 0;
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}
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/**
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* drm_authmagic - Authenticate client with a magic
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* @dev: DRM device to operate on
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* @data: ioctl data containing the drm_auth object
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* @file_priv: DRM file that performs the operation
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*
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* This looks up a DRM client by the passed magic and authenticates it.
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*
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* Returns: 0 on success, negative error code on failure.
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*/
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int drm_authmagic(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_auth *auth = data;
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struct drm_file *file;
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DRM_DEBUG("%u\n", auth->magic);
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mutex_lock(&dev->struct_mutex);
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file = idr_find(&file_priv->master->magic_map, auth->magic);
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if (file) {
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file->authenticated = 1;
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idr_replace(&file_priv->master->magic_map, NULL, auth->magic);
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}
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mutex_unlock(&dev->struct_mutex);
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return file ? 0 : -EINVAL;
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}
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