/**
 * watchdog_register_device() - register a watchdog device
 * @wdd: watchdog device
 *
 * Register a watchdog device with the kernel so that the
 * watchdog timer can be accessed from userspace.
 *
 * A zero is returned on success and a negative errno code for
 * failure.
 */
int watchdog_register_device(struct watchdog_device *wdd)
{
	int ret, id, devno;

	if (wdd == NULL || wdd->info == NULL || wdd->ops == NULL)
		return -EINVAL;

	/* Mandatory operations need to be supported */
	if (wdd->ops->start == NULL || wdd->ops->stop == NULL)
		return -EINVAL;

	watchdog_check_min_max_timeout(wdd);

	/*
	 * Note: now that all watchdog_device data has been verified, we
	 * will not check this anymore in other functions. If data gets
	 * corrupted in a later stage then we expect a kernel panic!
	 */

	mutex_init(&wdd->lock);
	id = ida_simple_get(&watchdog_ida, 0, MAX_DOGS, GFP_KERNEL);
	if (id < 0)
		return id;
	wdd->id = id;

	ret = watchdog_dev_register(wdd);
	if (ret) {
		ida_simple_remove(&watchdog_ida, id);
		if (!(id == 0 && ret == -EBUSY))
			return ret;

		/* Retry in case a legacy watchdog module exists */
		id = ida_simple_get(&watchdog_ida, 1, MAX_DOGS, GFP_KERNEL);
		if (id < 0)
			return id;
		wdd->id = id;

		ret = watchdog_dev_register(wdd);
		if (ret) {
			ida_simple_remove(&watchdog_ida, id);
			return ret;
		}
	}

	devno = wdd->cdev.dev;
	wdd->dev = device_create(watchdog_class, wdd->parent, devno,
					NULL, "watchdog%d", wdd->id);
	if (IS_ERR(wdd->dev)) {
		watchdog_dev_unregister(wdd);
		ida_simple_remove(&watchdog_ida, id);
		ret = PTR_ERR(wdd->dev);
		return ret;
	}

	return 0;
}

int iio_trigger_register(struct iio_trigger *trig_info)
{
	int ret;

	trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL);
	if (trig_info->id < 0)
		return trig_info->id;

	/* Set the name used for the sysfs directory etc */
	dev_set_name(&trig_info->dev, "trigger%ld",
		     (unsigned long) trig_info->id);

	ret = device_add(&trig_info->dev);
	if (ret)
		goto error_unregister_id;

	/* Add to list of available triggers held by the IIO core */
	mutex_lock(&iio_trigger_list_lock);
	list_add_tail(&trig_info->list, &iio_trigger_list);
	mutex_unlock(&iio_trigger_list_lock);

	return 0;

error_unregister_id:
	ida_simple_remove(&iio_trigger_ida, trig_info->id);
	return ret;
}

static int henry_close
(
	struct inode *inode,
	struct file  *file
)
{
	struct henry_session *session = file->private_data;
	struct henry_drv *drv = session->drv;

	/*Do not release resource in debug*/
	if (drv->debug_mode)
		return 0;

	mutex_lock(&drv->mutex);

	ida_simple_remove(&drv->sess_ida, session->id);
	drv->num_exist--;
	henry_dbgfs_del_session(session);
	devm_kfree(drv->dev, session);

	mutex_unlock(&drv->mutex);

	dev_info(drv->dev, "henry_drv_close\n");

	return 0;
}

void unregister_virtio_device(struct virtio_device *dev)
{
	int index = dev->index; /* save for after device release */

	device_unregister(&dev->dev);
	ida_simple_remove(&virtio_index_ida, index);
}

/**
 * kdbus_node_unref() - Drop object reference
 * @node:	node to drop reference to (or NULL)
 *
 * This drops an object reference to @node. You must not access the node if you
 * no longer own a reference.
 * If the ref-count drops to 0, the object will be destroyed (->free_cb will be
 * called).
 *
 * If you linked or activated the node, you must deactivate the node before you
 * drop your last reference! If you didn't link or activate the node, you can
 * drop any reference you want.
 *
 * Note that this calls into ->free_cb() and thus _might_ sleep. The ->free_cb()
 * callbacks must not acquire any outer locks, though. So you can safely drop
 * references while holding locks.
 *
 * If @node is NULL, this is a no-op.
 *
 * Return: This always returns NULL
 */
struct kdbus_node *kdbus_node_unref(struct kdbus_node *node)
{
	if (node && atomic_dec_and_test(&node->refcnt)) {
		struct kdbus_node safe = *node;

		WARN_ON(atomic_read(&node->active) != KDBUS_NODE_DRAINED);
		WARN_ON(!RB_EMPTY_NODE(&node->rb));

		if (node->free_cb)
			node->free_cb(node);
		if (safe.id > 0)
			ida_simple_remove(&kdbus_node_ida, safe.id);

		kfree(safe.name);

		/*
		 * kdbusfs relies on the parent to be available even after the
		 * node was deactivated and unlinked. Therefore, we pin it
		 * until a node is destroyed.
		 */
		kdbus_node_unref(safe.parent);
	}

	return NULL;
}

static void nvdimm_release(struct device *dev)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	ida_simple_remove(&dimm_ida, nvdimm->id);
	kfree(nvdimm);
}

/**
 * blk_release_queue: - release a &struct request_queue when it is no longer needed
 * @kobj:    the kobj belonging to the request queue to be released
 *
 * Description:
 *     blk_release_queue is the pair to blk_init_queue() or
 *     blk_queue_make_request().  It should be called when a request queue is
 *     being released; typically when a block device is being de-registered.
 *     Currently, its primary task it to free all the &struct request
 *     structures that were allocated to the queue and the queue itself.
 *
 * Note:
 *     The low level driver must have finished any outstanding requests first
 *     via blk_cleanup_queue().
 **/
static void blk_release_queue(struct kobject *kobj)
{
    struct request_queue *q =
        container_of(kobj, struct request_queue, kobj);

    blkcg_exit_queue(q);

    if (q->elevator) {
        spin_lock_irq(q->queue_lock);
        ioc_clear_queue(q);
        spin_unlock_irq(q->queue_lock);
        elevator_exit(q->elevator);
    }

    blk_exit_rl(&q->root_rl);

    if (q->queue_tags)
        __blk_queue_free_tags(q);

    kfree(q->flush_rq);

    blk_trace_shutdown(q);

    bdi_destroy(&q->backing_dev_info);

    ida_simple_remove(&blk_queue_ida, q->id);
    call_rcu(&q->rcu_head, blk_free_queue_rcu);
}

static int w1_ds2781_add_slave(struct w1_slave *sl)
{
	int ret;
	int id;
	struct platform_device *pdev;

	id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
	if (id < 0) {
		ret = id;
		goto noid;
	}

	pdev = platform_device_alloc("ds2781-battery", id);
	if (!pdev) {
		ret = -ENOMEM;
		goto pdev_alloc_failed;
	}
	pdev->dev.parent = &sl->dev;

	ret = platform_device_add(pdev);
	if (ret)
		goto pdev_add_failed;

	dev_set_drvdata(&sl->dev, pdev);

	return 0;

pdev_add_failed:
	platform_device_put(pdev);
pdev_alloc_failed:
	ida_simple_remove(&bat_ida, id);
noid:
	return ret;
}

static void kp2000_pcie_remove(struct pci_dev *pdev)
{
	struct kp2000_device *pcard = pci_get_drvdata(pdev);

	dev_dbg(&pdev->dev, "kp2000_pcie_remove(pdev=%p)\n", pdev);

	if (pcard == NULL)
		return;

	mutex_lock(&pcard->sem);
	kp2000_remove_cores(pcard);
	mfd_remove_devices(PCARD_TO_DEV(pcard));
	misc_deregister(&pcard->miscdev);
	sysfs_remove_files(&(pdev->dev.kobj), kp_attr_list);
	free_irq(pcard->pdev->irq, pcard);
	pci_disable_msi(pcard->pdev);
	if (pcard->dma_bar_base != NULL) {
		iounmap(pcard->dma_bar_base);
		pci_release_region(pdev, DMA_BAR);
		pcard->dma_bar_base = NULL;
	}
	if (pcard->regs_bar_base != NULL) {
		iounmap(pcard->regs_bar_base);
		pci_release_region(pdev, REG_BAR);
		pcard->regs_bar_base = NULL;
	}
	pci_disable_device(pcard->pdev);
	pci_set_drvdata(pdev, NULL);
	mutex_unlock(&pcard->sem);
	ida_simple_remove(&card_num_ida, pcard->card_num);
	kfree(pcard);
}

/**
 * blk_cleanup_queue: - release a &struct request_queue when it is no longer needed
 * @kobj:    the kobj belonging of the request queue to be released
 *
 * Description:
 *     blk_cleanup_queue is the pair to blk_init_queue() or
 *     blk_queue_make_request().  It should be called when a request queue is
 *     being released; typically when a block device is being de-registered.
 *     Currently, its primary task it to free all the &struct request
 *     structures that were allocated to the queue and the queue itself.
 *
 * Caveat:
 *     Hopefully the low level driver will have finished any
 *     outstanding requests first...
 **/
static void blk_release_queue(struct kobject *kobj)
{
	struct request_queue *q =
		container_of(kobj, struct request_queue, kobj);
	struct request_list *rl = &q->rq;

	blk_sync_queue(q);

	if (q->elevator) {
		spin_lock_irq(q->queue_lock);
		ioc_clear_queue(q);
		spin_unlock_irq(q->queue_lock);
		elevator_exit(q->elevator);
	}

	blk_throtl_exit(q);

	if (rl->rq_pool)
		mempool_destroy(rl->rq_pool);

	if (q->queue_tags)
		__blk_queue_free_tags(q);

	blk_throtl_release(q);
	blk_trace_shutdown(q);

	bdi_destroy(&q->backing_dev_info);

	ida_simple_remove(&blk_queue_ida, q->id);
	kmem_cache_free(blk_requestq_cachep, q);
}

void i915_gem_context_free(struct kref *ctx_ref)
{
	struct i915_gem_context *ctx = container_of(ctx_ref, typeof(*ctx), ref);
	int i;

	lockdep_assert_held(&ctx->i915->drm.struct_mutex);
	trace_i915_context_free(ctx);
	GEM_BUG_ON(!i915_gem_context_is_closed(ctx));

	i915_ppgtt_put(ctx->ppgtt);

	for (i = 0; i < I915_NUM_ENGINES; i++) {
		struct intel_context *ce = &ctx->engine[i];

		if (!ce->state)
			continue;

		WARN_ON(ce->pin_count);
		if (ce->ring)
			intel_ring_free(ce->ring);

		__i915_gem_object_release_unless_active(ce->state->obj);
	}

	kfree(ctx->name);
	put_pid(ctx->pid);
	list_del(&ctx->link);

	ida_simple_remove(&ctx->i915->context_hw_ida, ctx->hw_id);
	kfree(ctx);
}

/**
 * blk_release_queue: - release a &struct request_queue when it is no longer needed
 * @kobj:    the kobj belonging to the request queue to be released
 *
 * Description:
 *     blk_release_queue is the pair to blk_init_queue() or
 *     blk_queue_make_request().  It should be called when a request queue is
 *     being released; typically when a block device is being de-registered.
 *     Currently, its primary task it to free all the &struct request
 *     structures that were allocated to the queue and the queue itself.
 *
 * Note:
 *     The low level driver must have finished any outstanding requests first
 *     via blk_cleanup_queue().
 **/
static void blk_release_queue(struct kobject *kobj)
{
	struct request_queue *q =
		container_of(kobj, struct request_queue, kobj);

	blkcg_exit_queue(q);

	if (q->elevator) {
		spin_lock_irq(q->queue_lock);
		ioc_clear_queue(q);
		spin_unlock_irq(q->queue_lock);
		elevator_exit(q->elevator);
	}

	blk_exit_rl(&q->root_rl);

	if (q->queue_tags)
		__blk_queue_free_tags(q);

	if (!q->mq_ops)
		blk_free_flush_queue(q->fq);
	else
		blk_mq_release(q);

	blk_trace_shutdown(q);

	if (q->bio_split)
		bioset_free(q->bio_split);

	ida_simple_remove(&blk_queue_ida, q->id);
	call_rcu(&q->rcu_head, blk_free_queue_rcu);
}

/**
 * of_devfreq_cooling_register_power() - Register devfreq cooling device,
 *                                      with OF and power information.
 * @np:	Pointer to OF device_node.
 * @df:	Pointer to devfreq device.
 * @dfc_power:	Pointer to devfreq_cooling_power.
 *
 * Register a devfreq cooling device.  The available OPPs must be
 * registered on the device.
 *
 * If @dfc_power is provided, the cooling device is registered with the
 * power extensions.  For the power extensions to work correctly,
 * devfreq should use the simple_ondemand governor, other governors
 * are not currently supported.
 */
struct thermal_cooling_device *
of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
				  struct devfreq_cooling_power *dfc_power)
{
	struct thermal_cooling_device *cdev;
	struct devfreq_cooling_device *dfc;
	char dev_name[THERMAL_NAME_LENGTH];
	int err;

	dfc = kzalloc(sizeof(*dfc), GFP_KERNEL);
	if (!dfc)
		return ERR_PTR(-ENOMEM);

	dfc->devfreq = df;

	if (dfc_power) {
		dfc->power_ops = dfc_power;

		devfreq_cooling_ops.get_requested_power =
			devfreq_cooling_get_requested_power;
		devfreq_cooling_ops.state2power = devfreq_cooling_state2power;
		devfreq_cooling_ops.power2state = devfreq_cooling_power2state;
	}

	err = devfreq_cooling_gen_tables(dfc);
	if (err)
		goto free_dfc;

	err = ida_simple_get(&devfreq_ida, 0, 0, GFP_KERNEL);
	if (err < 0)
		goto free_tables;
	dfc->id = err;

	snprintf(dev_name, sizeof(dev_name), "thermal-devfreq-%d", dfc->id);

	cdev = thermal_of_cooling_device_register(np, dev_name, dfc,
						  &devfreq_cooling_ops);
	if (IS_ERR(cdev)) {
		err = PTR_ERR(cdev);
		dev_err(df->dev.parent,
			"Failed to register devfreq cooling device (%d)\n",
			err);
		goto release_ida;
	}

	dfc->cdev = cdev;

	return cdev;

release_ida:
	ida_simple_remove(&devfreq_ida, dfc->id);
free_tables:
	kfree(dfc->power_table);
	kfree(dfc->freq_table);
free_dfc:
	kfree(dfc);

	return ERR_PTR(err);
}

static void flexrm_shutdown(struct mbox_chan *chan)
{
	u32 reqid;
	unsigned int timeout;
	struct brcm_message *msg;
	struct flexrm_ring *ring = chan->con_priv;

	/* Disable/inactivate ring */
	writel_relaxed(0x0, ring->regs + RING_CONTROL);

	/* Flush ring with timeout of 1s */
	timeout = 1000;
	writel_relaxed(BIT(CONTROL_FLUSH_SHIFT),
			ring->regs + RING_CONTROL);
	do {
		if (readl_relaxed(ring->regs + RING_FLUSH_DONE) &
		    FLUSH_DONE_MASK)
			break;
		mdelay(1);
	} while (timeout--);

	/* Abort all in-flight requests */
	for (reqid = 0; reqid < RING_MAX_REQ_COUNT; reqid++) {
		msg = ring->requests[reqid];
		if (!msg)
			continue;

		/* Release reqid for recycling */
		ring->requests[reqid] = NULL;
		ida_simple_remove(&ring->requests_ida, reqid);

		/* Unmap DMA mappings */
		flexrm_dma_unmap(ring->mbox->dev, msg);

		/* Give-back message to mailbox client */
		msg->error = -EIO;
		mbox_chan_received_data(chan, msg);
	}

	/* Release IRQ */
	if (ring->irq_requested) {
		free_irq(ring->irq, ring);
		ring->irq_requested = false;
	}

	/* Free-up completion descriptor ring */
	if (ring->cmpl_base) {
		dma_pool_free(ring->mbox->cmpl_pool,
			      ring->cmpl_base, ring->cmpl_dma_base);
		ring->cmpl_base = NULL;
	}

	/* Free-up BD descriptor ring */
	if (ring->bd_base) {
		dma_pool_free(ring->mbox->bd_pool,
			      ring->bd_base, ring->bd_dma_base);
		ring->bd_base = NULL;
	}
}

/**
 * mcb_release_bus() - Free a @mcb_bus
 * @bus: The @mcb_bus to release
 *
 * Release an allocated @mcb_bus from the system.
 */
void mcb_release_bus(struct mcb_bus *bus)
{
    mcb_devices_unregister(bus);

    ida_simple_remove(&mcb_ida, bus->bus_nr);

    kfree(bus);
}

static void nvdimm_bus_release(struct device *dev)
{
	struct nvdimm_bus *nvdimm_bus;

	nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
	ida_simple_remove(&nd_ida, nvdimm_bus->id);
	kfree(nvdimm_bus);
}

int ipack_bus_unregister(struct ipack_bus_device *bus)
{
    bus_for_each_dev(&ipack_bus_type, NULL, bus,
                     ipack_unregister_bus_member);
    ida_simple_remove(&ipack_ida, bus->bus_nr);
    kfree(bus);
    return 0;
}

static void w1_ds2781_remove_slave(struct w1_slave *sl)
{
	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
	int id = pdev->id;

	platform_device_unregister(pdev);
	ida_simple_remove(&bat_ida, id);
}

static void mcb_free_bus(struct device *dev)
{
	struct mcb_bus *bus = to_mcb_bus(dev);

	put_device(bus->carrier);
	ida_simple_remove(&mcb_ida, bus->bus_nr);
	kfree(bus);
}

static void delete_ptp_clock(struct posix_clock *pc)
{
	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);

	mutex_destroy(&ptp->tsevq_mux);
	ida_simple_remove(&ptp_clocks_map, ptp->index);
	kfree(ptp);
}