Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 824 insertions, 0 deletions

diff --git a/drivers/base/component.c b/drivers/base/component.c
new file mode 100644
index 0000000000..7dbf14a1d9
--- /dev/null
+++ b/drivers/base/component.c
@@ -0,0 +1,824 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Componentized device handling.
+ */
+#include <linux/component.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+
+/**
+ * DOC: overview
+ *
+ * The component helper allows drivers to collect a pile of sub-devices,
+ * including their bound drivers, into an aggregate driver. Various subsystems
+ * already provide functions to get hold of such components, e.g.
+ * of_clk_get_by_name(). The component helper can be used when such a
+ * subsystem-specific way to find a device is not available: The component
+ * helper fills the niche of aggregate drivers for specific hardware, where
+ * further standardization into a subsystem would not be practical. The common
+ * example is when a logical device (e.g. a DRM display driver) is spread around
+ * the SoC on various components (scanout engines, blending blocks, transcoders
+ * for various outputs and so on).
+ *
+ * The component helper also doesn't solve runtime dependencies, e.g. for system
+ * suspend and resume operations. See also :ref:`device links<device_link>`.
+ *
+ * Components are registered using component_add() and unregistered with
+ * component_del(), usually from the driver's probe and disconnect functions.
+ *
+ * Aggregate drivers first assemble a component match list of what they need
+ * using component_match_add(). This is then registered as an aggregate driver
+ * using component_master_add_with_match(), and unregistered using
+ * component_master_del().
+ */
+
+struct component;
+
+struct component_match_array {
+	void *data;
+	int (*compare)(struct device *, void *);
+	int (*compare_typed)(struct device *, int, void *);
+	void (*release)(struct device *, void *);
+	struct component *component;
+	bool duplicate;
+};
+
+struct component_match {
+	size_t alloc;
+	size_t num;
+	struct component_match_array *compare;
+};
+
+struct aggregate_device {
+	struct list_head node;
+	bool bound;
+
+	const struct component_master_ops *ops;
+	struct device *parent;
+	struct component_match *match;
+};
+
+struct component {
+	struct list_head node;
+	struct aggregate_device *adev;
+	bool bound;
+
+	const struct component_ops *ops;
+	int subcomponent;
+	struct device *dev;
+};
+
+static DEFINE_MUTEX(component_mutex);
+static LIST_HEAD(component_list);
+static LIST_HEAD(aggregate_devices);
+
+#ifdef CONFIG_DEBUG_FS
+
+static struct dentry *component_debugfs_dir;
+
+static int component_devices_show(struct seq_file *s, void *data)
+{
+	struct aggregate_device *m = s->private;
+	struct component_match *match = m->match;
+	size_t i;
+
+	mutex_lock(&component_mutex);
+	seq_printf(s, "%-40s %20s\n", "aggregate_device name", "status");
+	seq_puts(s, "-------------------------------------------------------------\n");
+	seq_printf(s, "%-40s %20s\n\n",
+		   dev_name(m->parent), m->bound ? "bound" : "not bound");
+
+	seq_printf(s, "%-40s %20s\n", "device name", "status");
+	seq_puts(s, "-------------------------------------------------------------\n");
+	for (i = 0; i < match->num; i++) {
+		struct component *component = match->compare[i].component;
+
+		seq_printf(s, "%-40s %20s\n",
+			   component ? dev_name(component->dev) : "(unknown)",
+			   component ? (component->bound ? "bound" : "not bound") : "not registered");
+	}
+	mutex_unlock(&component_mutex);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(component_devices);
+
+static int __init component_debug_init(void)
+{
+	component_debugfs_dir = debugfs_create_dir("device_component", NULL);
+
+	return 0;
+}
+
+core_initcall(component_debug_init);
+
+static void component_debugfs_add(struct aggregate_device *m)
+{
+	debugfs_create_file(dev_name(m->parent), 0444, component_debugfs_dir, m,
+			    &component_devices_fops);
+}
+
+static void component_debugfs_del(struct aggregate_device *m)
+{
+	debugfs_lookup_and_remove(dev_name(m->parent), component_debugfs_dir);
+}
+
+#else
+
+static void component_debugfs_add(struct aggregate_device *m)
+{ }
+
+static void component_debugfs_del(struct aggregate_device *m)
+{ }
+
+#endif
+
+static struct aggregate_device *__aggregate_find(struct device *parent,
+	const struct component_master_ops *ops)
+{
+	struct aggregate_device *m;
+
+	list_for_each_entry(m, &aggregate_devices, node)
+		if (m->parent == parent && (!ops || m->ops == ops))
+			return m;
+
+	return NULL;
+}
+
+static struct component *find_component(struct aggregate_device *adev,
+	struct component_match_array *mc)
+{
+	struct component *c;
+
+	list_for_each_entry(c, &component_list, node) {
+		if (c->adev && c->adev != adev)
+			continue;
+
+		if (mc->compare && mc->compare(c->dev, mc->data))
+			return c;
+
+		if (mc->compare_typed &&
+		    mc->compare_typed(c->dev, c->subcomponent, mc->data))
+			return c;
+	}
+
+	return NULL;
+}
+
+static int find_components(struct aggregate_device *adev)
+{
+	struct component_match *match = adev->match;
+	size_t i;
+	int ret = 0;
+
+	/*
+	 * Scan the array of match functions and attach
+	 * any components which are found to this adev.
+	 */
+	for (i = 0; i < match->num; i++) {
+		struct component_match_array *mc = &match->compare[i];
+		struct component *c;
+
+		dev_dbg(adev->parent, "Looking for component %zu\n", i);
+
+		if (match->compare[i].component)
+			continue;
+
+		c = find_component(adev, mc);
+		if (!c) {
+			ret = -ENXIO;
+			break;
+		}
+
+		dev_dbg(adev->parent, "found component %s, duplicate %u\n",
+			dev_name(c->dev), !!c->adev);
+
+		/* Attach this component to the adev */
+		match->compare[i].duplicate = !!c->adev;
+		match->compare[i].component = c;
+		c->adev = adev;
+	}
+	return ret;
+}
+
+/* Detach component from associated aggregate_device */
+static void remove_component(struct aggregate_device *adev, struct component *c)
+{
+	size_t i;
+
+	/* Detach the component from this adev. */
+	for (i = 0; i < adev->match->num; i++)
+		if (adev->match->compare[i].component == c)
+			adev->match->compare[i].component = NULL;
+}
+
+/*
+ * Try to bring up an aggregate device.  If component is NULL, we're interested
+ * in this aggregate device, otherwise it's a component which must be present
+ * to try and bring up the aggregate device.
+ *
+ * Returns 1 for successful bringup, 0 if not ready, or -ve errno.
+ */
+static int try_to_bring_up_aggregate_device(struct aggregate_device *adev,
+	struct component *component)
+{
+	int ret;
+
+	dev_dbg(adev->parent, "trying to bring up adev\n");
+
+	if (find_components(adev)) {
+		dev_dbg(adev->parent, "master has incomplete components\n");
+		return 0;
+	}
+
+	if (component && component->adev != adev) {
+		dev_dbg(adev->parent, "master is not for this component (%s)\n",
+			dev_name(component->dev));
+		return 0;
+	}
+
+	if (!devres_open_group(adev->parent, adev, GFP_KERNEL))
+		return -ENOMEM;
+
+	/* Found all components */
+	ret = adev->ops->bind(adev->parent);
+	if (ret < 0) {
+		devres_release_group(adev->parent, NULL);
+		if (ret != -EPROBE_DEFER)
+			dev_info(adev->parent, "adev bind failed: %d\n", ret);
+		return ret;
+	}
+
+	devres_close_group(adev->parent, NULL);
+	adev->bound = true;
+	return 1;
+}
+
+static int try_to_bring_up_masters(struct component *component)
+{
+	struct aggregate_device *adev;
+	int ret = 0;
+
+	list_for_each_entry(adev, &aggregate_devices, node) {
+		if (!adev->bound) {
+			ret = try_to_bring_up_aggregate_device(adev, component);
+			if (ret != 0)
+				break;
+		}
+	}
+
+	return ret;
+}
+
+static void take_down_aggregate_device(struct aggregate_device *adev)
+{
+	if (adev->bound) {
+		adev->ops->unbind(adev->parent);
+		devres_release_group(adev->parent, adev);
+		adev->bound = false;
+	}
+}
+
+/**
+ * component_compare_of - A common component compare function for of_node
+ * @dev: component device
+ * @data: @compare_data from component_match_add_release()
+ *
+ * A common compare function when compare_data is device of_node. e.g.
+ * component_match_add_release(masterdev, &match, component_release_of,
+ * component_compare_of, component_dev_of_node)
+ */
+int component_compare_of(struct device *dev, void *data)
+{
+	return device_match_of_node(dev, data);
+}
+EXPORT_SYMBOL_GPL(component_compare_of);
+
+/**
+ * component_release_of - A common component release function for of_node
+ * @dev: component device
+ * @data: @compare_data from component_match_add_release()
+ *
+ * About the example, Please see component_compare_of().
+ */
+void component_release_of(struct device *dev, void *data)
+{
+	of_node_put(data);
+}
+EXPORT_SYMBOL_GPL(component_release_of);
+
+/**
+ * component_compare_dev - A common component compare function for dev
+ * @dev: component device
+ * @data: @compare_data from component_match_add_release()
+ *
+ * A common compare function when compare_data is struce device. e.g.
+ * component_match_add(masterdev, &match, component_compare_dev, component_dev)
+ */
+int component_compare_dev(struct device *dev, void *data)
+{
+	return dev == data;
+}
+EXPORT_SYMBOL_GPL(component_compare_dev);
+
+/**
+ * component_compare_dev_name - A common component compare function for device name
+ * @dev: component device
+ * @data: @compare_data from component_match_add_release()
+ *
+ * A common compare function when compare_data is device name string. e.g.
+ * component_match_add(masterdev, &match, component_compare_dev_name,
+ * "component_dev_name")
+ */
+int component_compare_dev_name(struct device *dev, void *data)
+{
+	return device_match_name(dev, data);
+}
+EXPORT_SYMBOL_GPL(component_compare_dev_name);
+
+static void devm_component_match_release(struct device *parent, void *res)
+{
+	struct component_match *match = res;
+	unsigned int i;
+
+	for (i = 0; i < match->num; i++) {
+		struct component_match_array *mc = &match->compare[i];
+
+		if (mc->release)
+			mc->release(parent, mc->data);
+	}
+
+	kfree(match->compare);
+}
+
+static int component_match_realloc(struct component_match *match, size_t num)
+{
+	struct component_match_array *new;
+
+	if (match->alloc == num)
+		return 0;
+
+	new = kmalloc_array(num, sizeof(*new), GFP_KERNEL);
+	if (!new)
+		return -ENOMEM;
+
+	if (match->compare) {
+		memcpy(new, match->compare, sizeof(*new) *
+					    min(match->num, num));
+		kfree(match->compare);
+	}
+	match->compare = new;
+	match->alloc = num;
+
+	return 0;
+}
+
+static void __component_match_add(struct device *parent,
+	struct component_match **matchptr,
+	void (*release)(struct device *, void *),
+	int (*compare)(struct device *, void *),
+	int (*compare_typed)(struct device *, int, void *),
+	void *compare_data)
+{
+	struct component_match *match = *matchptr;
+
+	if (IS_ERR(match))
+		return;
+
+	if (!match) {
+		match = devres_alloc(devm_component_match_release,
+				     sizeof(*match), GFP_KERNEL);
+		if (!match) {
+			*matchptr = ERR_PTR(-ENOMEM);
+			return;
+		}
+
+		devres_add(parent, match);
+
+		*matchptr = match;
+	}
+
+	if (match->num == match->alloc) {
+		size_t new_size = match->alloc + 16;
+		int ret;
+
+		ret = component_match_realloc(match, new_size);
+		if (ret) {
+			*matchptr = ERR_PTR(ret);
+			return;
+		}
+	}
+
+	match->compare[match->num].compare = compare;
+	match->compare[match->num].compare_typed = compare_typed;
+	match->compare[match->num].release = release;
+	match->compare[match->num].data = compare_data;
+	match->compare[match->num].component = NULL;
+	match->num++;
+}
+
+/**
+ * component_match_add_release - add a component match entry with release callback
+ * @parent: parent device of the aggregate driver
+ * @matchptr: pointer to the list of component matches
+ * @release: release function for @compare_data
+ * @compare: compare function to match against all components
+ * @compare_data: opaque pointer passed to the @compare function
+ *
+ * Adds a new component match to the list stored in @matchptr, which the
+ * aggregate driver needs to function. The list of component matches pointed to
+ * by @matchptr must be initialized to NULL before adding the first match. This
+ * only matches against components added with component_add().
+ *
+ * The allocated match list in @matchptr is automatically released using devm
+ * actions, where upon @release will be called to free any references held by
+ * @compare_data, e.g. when @compare_data is a &device_node that must be
+ * released with of_node_put().
+ *
+ * See also component_match_add() and component_match_add_typed().
+ */
+void component_match_add_release(struct device *parent,
+	struct component_match **matchptr,
+	void (*release)(struct device *, void *),
+	int (*compare)(struct device *, void *), void *compare_data)
+{
+	__component_match_add(parent, matchptr, release, compare, NULL,
+			      compare_data);
+}
+EXPORT_SYMBOL(component_match_add_release);
+
+/**
+ * component_match_add_typed - add a component match entry for a typed component
+ * @parent: parent device of the aggregate driver
+ * @matchptr: pointer to the list of component matches
+ * @compare_typed: compare function to match against all typed components
+ * @compare_data: opaque pointer passed to the @compare function
+ *
+ * Adds a new component match to the list stored in @matchptr, which the
+ * aggregate driver needs to function. The list of component matches pointed to
+ * by @matchptr must be initialized to NULL before adding the first match. This
+ * only matches against components added with component_add_typed().
+ *
+ * The allocated match list in @matchptr is automatically released using devm
+ * actions.
+ *
+ * See also component_match_add_release() and component_match_add_typed().
+ */
+void component_match_add_typed(struct device *parent,
+	struct component_match **matchptr,
+	int (*compare_typed)(struct device *, int, void *), void *compare_data)
+{
+	__component_match_add(parent, matchptr, NULL, NULL, compare_typed,
+			      compare_data);
+}
+EXPORT_SYMBOL(component_match_add_typed);
+
+static void free_aggregate_device(struct aggregate_device *adev)
+{
+	struct component_match *match = adev->match;
+	int i;
+
+	component_debugfs_del(adev);
+	list_del(&adev->node);
+
+	if (match) {
+		for (i = 0; i < match->num; i++) {
+			struct component *c = match->compare[i].component;
+			if (c)
+				c->adev = NULL;
+		}
+	}
+
+	kfree(adev);
+}
+
+/**
+ * component_master_add_with_match - register an aggregate driver
+ * @parent: parent device of the aggregate driver
+ * @ops: callbacks for the aggregate driver
+ * @match: component match list for the aggregate driver
+ *
+ * Registers a new aggregate driver consisting of the components added to @match
+ * by calling one of the component_match_add() functions. Once all components in
+ * @match are available, it will be assembled by calling
+ * &component_master_ops.bind from @ops. Must be unregistered by calling
+ * component_master_del().
+ */
+int component_master_add_with_match(struct device *parent,
+	const struct component_master_ops *ops,
+	struct component_match *match)
+{
+	struct aggregate_device *adev;
+	int ret;
+
+	/* Reallocate the match array for its true size */
+	ret = component_match_realloc(match, match->num);
+	if (ret)
+		return ret;
+
+	adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+	if (!adev)
+		return -ENOMEM;
+
+	adev->parent = parent;
+	adev->ops = ops;
+	adev->match = match;
+
+	component_debugfs_add(adev);
+	/* Add to the list of available aggregate devices. */
+	mutex_lock(&component_mutex);
+	list_add(&adev->node, &aggregate_devices);
+
+	ret = try_to_bring_up_aggregate_device(adev, NULL);
+
+	if (ret < 0)
+		free_aggregate_device(adev);
+
+	mutex_unlock(&component_mutex);
+
+	return ret < 0 ? ret : 0;
+}
+EXPORT_SYMBOL_GPL(component_master_add_with_match);
+
+/**
+ * component_master_del - unregister an aggregate driver
+ * @parent: parent device of the aggregate driver
+ * @ops: callbacks for the aggregate driver
+ *
+ * Unregisters an aggregate driver registered with
+ * component_master_add_with_match(). If necessary the aggregate driver is first
+ * disassembled by calling &component_master_ops.unbind from @ops.
+ */
+void component_master_del(struct device *parent,
+	const struct component_master_ops *ops)
+{
+	struct aggregate_device *adev;
+
+	mutex_lock(&component_mutex);
+	adev = __aggregate_find(parent, ops);
+	if (adev) {
+		take_down_aggregate_device(adev);
+		free_aggregate_device(adev);
+	}
+	mutex_unlock(&component_mutex);
+}
+EXPORT_SYMBOL_GPL(component_master_del);
+
+static void component_unbind(struct component *component,
+	struct aggregate_device *adev, void *data)
+{
+	WARN_ON(!component->bound);
+
+	if (component->ops && component->ops->unbind)
+		component->ops->unbind(component->dev, adev->parent, data);
+	component->bound = false;
+
+	/* Release all resources claimed in the binding of this component */
+	devres_release_group(component->dev, component);
+}
+
+/**
+ * component_unbind_all - unbind all components of an aggregate driver
+ * @parent: parent device of the aggregate driver
+ * @data: opaque pointer, passed to all components
+ *
+ * Unbinds all components of the aggregate device by passing @data to their
+ * &component_ops.unbind functions. Should be called from
+ * &component_master_ops.unbind.
+ */
+void component_unbind_all(struct device *parent, void *data)
+{
+	struct aggregate_device *adev;
+	struct component *c;
+	size_t i;
+
+	WARN_ON(!mutex_is_locked(&component_mutex));
+
+	adev = __aggregate_find(parent, NULL);
+	if (!adev)
+		return;
+
+	/* Unbind components in reverse order */
+	for (i = adev->match->num; i--; )
+		if (!adev->match->compare[i].duplicate) {
+			c = adev->match->compare[i].component;
+			component_unbind(c, adev, data);
+		}
+}
+EXPORT_SYMBOL_GPL(component_unbind_all);
+
+static int component_bind(struct component *component, struct aggregate_device *adev,
+	void *data)
+{
+	int ret;
+
+	/*
+	 * Each component initialises inside its own devres group.
+	 * This allows us to roll-back a failed component without
+	 * affecting anything else.
+	 */
+	if (!devres_open_group(adev->parent, NULL, GFP_KERNEL))
+		return -ENOMEM;
+
+	/*
+	 * Also open a group for the device itself: this allows us
+	 * to release the resources claimed against the sub-device
+	 * at the appropriate moment.
+	 */
+	if (!devres_open_group(component->dev, component, GFP_KERNEL)) {
+		devres_release_group(adev->parent, NULL);
+		return -ENOMEM;
+	}
+
+	dev_dbg(adev->parent, "binding %s (ops %ps)\n",
+		dev_name(component->dev), component->ops);
+
+	ret = component->ops->bind(component->dev, adev->parent, data);
+	if (!ret) {
+		component->bound = true;
+
+		/*
+		 * Close the component device's group so that resources
+		 * allocated in the binding are encapsulated for removal
+		 * at unbind.  Remove the group on the DRM device as we
+		 * can clean those resources up independently.
+		 */
+		devres_close_group(component->dev, NULL);
+		devres_remove_group(adev->parent, NULL);
+
+		dev_info(adev->parent, "bound %s (ops %ps)\n",
+			 dev_name(component->dev), component->ops);
+	} else {
+		devres_release_group(component->dev, NULL);
+		devres_release_group(adev->parent, NULL);
+
+		if (ret != -EPROBE_DEFER)
+			dev_err(adev->parent, "failed to bind %s (ops %ps): %d\n",
+				dev_name(component->dev), component->ops, ret);
+	}
+
+	return ret;
+}
+
+/**
+ * component_bind_all - bind all components of an aggregate driver
+ * @parent: parent device of the aggregate driver
+ * @data: opaque pointer, passed to all components
+ *
+ * Binds all components of the aggregate @dev by passing @data to their
+ * &component_ops.bind functions. Should be called from
+ * &component_master_ops.bind.
+ */
+int component_bind_all(struct device *parent, void *data)
+{
+	struct aggregate_device *adev;
+	struct component *c;
+	size_t i;
+	int ret = 0;
+
+	WARN_ON(!mutex_is_locked(&component_mutex));
+
+	adev = __aggregate_find(parent, NULL);
+	if (!adev)
+		return -EINVAL;
+
+	/* Bind components in match order */
+	for (i = 0; i < adev->match->num; i++)
+		if (!adev->match->compare[i].duplicate) {
+			c = adev->match->compare[i].component;
+			ret = component_bind(c, adev, data);
+			if (ret)
+				break;
+		}
+
+	if (ret != 0) {
+		for (; i > 0; i--)
+			if (!adev->match->compare[i - 1].duplicate) {
+				c = adev->match->compare[i - 1].component;
+				component_unbind(c, adev, data);
+			}
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(component_bind_all);
+
+static int __component_add(struct device *dev, const struct component_ops *ops,
+	int subcomponent)
+{
+	struct component *component;
+	int ret;
+
+	component = kzalloc(sizeof(*component), GFP_KERNEL);
+	if (!component)
+		return -ENOMEM;
+
+	component->ops = ops;
+	component->dev = dev;
+	component->subcomponent = subcomponent;
+
+	dev_dbg(dev, "adding component (ops %ps)\n", ops);
+
+	mutex_lock(&component_mutex);
+	list_add_tail(&component->node, &component_list);
+
+	ret = try_to_bring_up_masters(component);
+	if (ret < 0) {
+		if (component->adev)
+			remove_component(component->adev, component);
+		list_del(&component->node);
+
+		kfree(component);
+	}
+	mutex_unlock(&component_mutex);
+
+	return ret < 0 ? ret : 0;
+}
+
+/**
+ * component_add_typed - register a component
+ * @dev: component device
+ * @ops: component callbacks
+ * @subcomponent: nonzero identifier for subcomponents
+ *
+ * Register a new component for @dev. Functions in @ops will be call when the
+ * aggregate driver is ready to bind the overall driver by calling
+ * component_bind_all(). See also &struct component_ops.
+ *
+ * @subcomponent must be nonzero and is used to differentiate between multiple
+ * components registerd on the same device @dev. These components are match
+ * using component_match_add_typed().
+ *
+ * The component needs to be unregistered at driver unload/disconnect by
+ * calling component_del().
+ *
+ * See also component_add().
+ */
+int component_add_typed(struct device *dev, const struct component_ops *ops,
+	int subcomponent)
+{
+	if (WARN_ON(subcomponent == 0))
+		return -EINVAL;
+
+	return __component_add(dev, ops, subcomponent);
+}
+EXPORT_SYMBOL_GPL(component_add_typed);
+
+/**
+ * component_add - register a component
+ * @dev: component device
+ * @ops: component callbacks
+ *
+ * Register a new component for @dev. Functions in @ops will be called when the
+ * aggregate driver is ready to bind the overall driver by calling
+ * component_bind_all(). See also &struct component_ops.
+ *
+ * The component needs to be unregistered at driver unload/disconnect by
+ * calling component_del().
+ *
+ * See also component_add_typed() for a variant that allows multipled different
+ * components on the same device.
+ */
+int component_add(struct device *dev, const struct component_ops *ops)
+{
+	return __component_add(dev, ops, 0);
+}
+EXPORT_SYMBOL_GPL(component_add);
+
+/**
+ * component_del - unregister a component
+ * @dev: component device
+ * @ops: component callbacks
+ *
+ * Unregister a component added with component_add(). If the component is bound
+ * into an aggregate driver, this will force the entire aggregate driver, including
+ * all its components, to be unbound.
+ */
+void component_del(struct device *dev, const struct component_ops *ops)
+{
+	struct component *c, *component = NULL;
+
+	mutex_lock(&component_mutex);
+	list_for_each_entry(c, &component_list, node)
+		if (c->dev == dev && c->ops == ops) {
+			list_del(&c->node);
+			component = c;
+			break;
+		}
+
+	if (component && component->adev) {
+		take_down_aggregate_device(component->adev);
+		remove_component(component->adev, component);
+	}
+
+	mutex_unlock(&component_mutex);
+
+	WARN_ON(!component);
+	kfree(component);
+}
+EXPORT_SYMBOL_GPL(component_del);