/**
* 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);
}
static void w1_ds2760_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);
sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);
}
static int gpio_exar_remove(struct platform_device *pdev)
{
struct exar_gpio_chip *exar_gpio = platform_get_drvdata(pdev);
ida_simple_remove(&ida_index, exar_gpio->index);
mutex_destroy(&exar_gpio->lock);
return 0;
}
static void reuseport_free_rcu(struct rcu_head *head)
{
struct sock_reuseport *reuse;
reuse = container_of(head, struct sock_reuseport, rcu);
sk_reuseport_prog_free(rcu_dereference_protected(reuse->prog, 1));
if (reuse->reuseport_id)
ida_simple_remove(&reuseport_ida, reuse->reuseport_id);
kfree(reuse);
}
void iio_trigger_unregister(struct iio_trigger *trig_info)
{
mutex_lock(&iio_trigger_list_lock);
list_del(&trig_info->list);
mutex_unlock(&iio_trigger_list_lock);
ida_simple_remove(&iio_trigger_ida, trig_info->id);
/* Possible issue in here */
device_del(&trig_info->dev);
}
static void gb_hd_release(struct device *dev)
{
struct gb_host_device *hd = to_gb_host_device(dev);
if (hd->svc)
gb_svc_put(hd->svc);
ida_simple_remove(&gb_hd_bus_id_map, hd->bus_id);
ida_destroy(&hd->cport_id_map);
kfree(hd);
}
static void xpad_led_disconnect(struct usb_xpad *xpad)
{
struct xpad_led *xpad_led = xpad->led;
if (xpad_led) {
led_classdev_unregister(&xpad_led->led_cdev);
ida_simple_remove(&xpad_pad_seq, xpad->pad_nr);
kfree(xpad_led);
}
}
static void tb_domain_release(struct device *dev)
{
struct tb *tb = container_of(dev, struct tb, dev);
tb_ctl_free(tb->ctl);
destroy_workqueue(tb->wq);
ida_simple_remove(&tb_domain_ida, tb->index);
mutex_destroy(&tb->lock);
kfree(tb);
}
void unregister_virtio_device(struct virtio_device *dev)
{
#if LINUX_VERSION_CODE > KERNEL_VERSION(3,0,13)
int index = dev->index; /* save for after device release */
#endif
device_unregister(&dev->dev);
#if LINUX_VERSION_CODE > KERNEL_VERSION(3,0,13)
ida_simple_remove(&virtio_index_ida, index);
#endif
}
/**
* hwmon_device_unregister - removes the previously registered class device
*
* @dev: the class device to destroy
*/
void hwmon_device_unregister(struct device *dev)
{
int id;
if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
device_unregister(dev);
ida_simple_remove(&hwmon_ida, id);
} else
dev_dbg(dev->parent,
"hwmon_device_unregister() failed: bad class ID!\n");
}
static void nd_pfn_release(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev->parent);
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
dev_dbg(dev, "%s\n", __func__);
nd_detach_ndns(&nd_pfn->dev, &nd_pfn->ndns);
ida_simple_remove(&nd_region->pfn_ida, nd_pfn->id);
kfree(nd_pfn->uuid);
kfree(nd_pfn);
}