linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Media device request objects

 *

 * Copyright 2018 Cisco Systems, Inc. and/or its affiliates. All rights reserved.

 * Copyright (C) 2018 Intel Corporation

 * Copyright (C) 2018 Google, Inc.

 *

 * Author: Hans Verkuil <hans.verkuil@cisco.com>

 * Author: Sakari Ailus <sakari.ailus@linux.intel.com>

 */

​

#include <linux/anon_inodes.h>

#include <linux/file.h>

#include <linux/refcount.h>

​

#include <media/media-device.h>

#include <media/media-request.h>

​

static const char * const request_state[] = {

    [MEDIA_REQUEST_STATE_IDLE]   = "idle",

    [MEDIA_REQUEST_STATE_VALIDATING] = "validating",

    [MEDIA_REQUEST_STATE_QUEUED]     = "queued",

    [MEDIA_REQUEST_STATE_COMPLETE]   = "complete",

    [MEDIA_REQUEST_STATE_CLEANING]   = "cleaning",

    [MEDIA_REQUEST_STATE_UPDATING]   = "updating",

};

​

static const char *

media_request_state_str(enum media_request_state state)

{

    BUILD_BUG_ON(ARRAY_SIZE(request_state) != NR_OF_MEDIA_REQUEST_STATE);

​

    if (WARN_ON(state >= ARRAY_SIZE(request_state)))

        return "invalid";

    return request_state[state];

}

​

static void media_request_clean(struct media_request *req)

{

    struct media_request_object *obj, *obj_safe;

​

    /* Just a sanity check. No other code path is allowed to change this. */

    WARN_ON(req->state != MEDIA_REQUEST_STATE_CLEANING);

    WARN_ON(req->updating_count);

    WARN_ON(req->access_count);

​

    list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {

        media_request_object_unbind(obj);

        media_request_object_put(obj);

    }

​

    req->updating_count = 0;

    req->access_count = 0;

    WARN_ON(req->num_incomplete_objects);

    req->num_incomplete_objects = 0;

    wake_up_interruptible_all(&req->poll_wait);

}

​

static void media_request_release(struct kref *kref)

{

    struct media_request *req =

        container_of(kref, struct media_request, kref);