[PATCH v3 23/23] counter: remove old and now unused registration API

Uwe Kleine-König
2021-12-29T15:45:38Z

Usage of counter_register() yields issues in device lifetime tracking. All
drivers were converted to the new API, so the old one can go away.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/counter/counter-core.c | 100 ++-------------------------------
include/linux/counter.h | 12 ----
2 files changed, 4 insertions(+), 108 deletions(-)

diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
index b3fa15bbcbdb..7e0957eea094 100644
--- a/drivers/counter/counter-core.c
+++ b/drivers/counter/counter-core.c
@@ -43,8 +43,7 @@ static void counter_device_release(struct device *dev)
counter_chrdev_remove(counter);
ida_free(&counter_ida, dev->id);

- if (!counter->legacy_device)
- kfree(container_of(counter, struct counter_device_allochelper, counter));
+ kfree(container_of(counter, struct counter_device_allochelper, counter));
}

static struct device_type counter_device_type = {
@@ -67,76 +66,13 @@ static dev_t counter_devt;
*/
void *counter_priv(const struct counter_device *const counter)
{
- if (counter->legacy_device) {
- return counter->priv;
- } else {
- struct counter_device_allochelper *ch =
- container_of(counter, struct counter_device_allochelper, counter);
+ struct counter_device_allochelper *ch =
+ container_of(counter, struct counter_device_allochelper, counter);

- return &ch->privdata;
- }
+ return &ch->privdata;
}
EXPORT_SYMBOL_GPL(counter_priv);

-/**
- * counter_register - register Counter to the system
- * @counter: pointer to Counter to register
- *
- * This function registers a Counter to the system. A sysfs "counter" directory
- * will be created and populated with sysfs attributes correlating with the
- * Counter Signals, Synapses, and Counts respectively.
- *
- * RETURNS:
- * 0 on success, negative error number on failure.
- */
-int counter_register(struct counter_device *const counter)
-{
- struct device *const dev = &counter->dev;
- int id;
- int err;
-
- counter->legacy_device = true;
-
- /* Acquire unique ID */
- id = ida_alloc(&counter_ida, GFP_KERNEL);
- if (id < 0)
- return id;
-
- mutex_init(&counter->ops_exist_lock);
-
- /* Configure device structure for Counter */
- dev->id = id;
- dev->type = &counter_device_type;
- dev->bus = &counter_bus_type;
- dev->devt = MKDEV(MAJOR(counter_devt), id);
- if (counter->parent) {
- dev->parent = counter->parent;
- dev->of_node = counter->parent->of_node;
- }
- device_initialize(dev);
-
- err = counter_sysfs_add(counter);
- if (err < 0)
- goto err_free_id;
-
- err = counter_chrdev_add(counter);
- if (err < 0)
- goto err_free_id;
-
- err = cdev_device_add(&counter->chrdev, dev);
- if (err < 0)
- goto err_remove_chrdev;
-
- return 0;
-
-err_remove_chrdev:
- counter_chrdev_remove(counter);
-err_free_id:
- put_device(dev);
- return err;
-}
-EXPORT_SYMBOL_GPL(counter_register);
-
/**
* counter_alloc - allocate a counter_device
* @sizeof_priv: size of the driver private data
@@ -245,9 +181,6 @@ void counter_unregister(struct counter_device *const counter)
wake_up(&counter->events_wait);

mutex_unlock(&counter->ops_exist_lock);
-
- if (counter->legacy_device)
- put_device(&counter->dev);
}
EXPORT_SYMBOL_GPL(counter_unregister);

@@ -256,31 +189,6 @@ static void devm_counter_release(void *counter)
counter_unregister(counter);
}

-/**
- * devm_counter_register - Resource-managed counter_register
- * @dev: device to allocate counter_device for
- * @counter: pointer to Counter to register
- *
- * Managed counter_register. The Counter registered with this function is
- * automatically unregistered on driver detach. This function calls
- * counter_register internally. Refer to that function for more information.
- *
- * RETURNS:
- * 0 on success, negative error number on failure.
- */
-int devm_counter_register(struct device *dev,
- struct counter_device *const counter)
-{
- int err;
-
- err = counter_register(counter);
- if (err < 0)
- return err;
-
- return devm_add_action_or_reset(dev, devm_counter_release, counter);
-}
-EXPORT_SYMBOL_GPL(devm_counter_register);
-
static void devm_counter_put(void *counter)
{
counter_put(counter);
diff --git a/include/linux/counter.h b/include/linux/counter.h
index f1350a43cd48..9afa0f1e9cea 100644
--- a/include/linux/counter.h
+++ b/include/linux/counter.h
@@ -314,8 +314,6 @@ struct counter_device {
struct counter_comp *ext;
size_t num_ext;

- void *priv;
-
struct device dev;
struct cdev chrdev;
struct list_head events_list;
@@ -327,25 +325,15 @@ struct counter_device {
spinlock_t events_in_lock;
struct mutex events_out_lock;
struct mutex ops_exist_lock;
-
- /*
- * This can go away once all drivers are converted to
- * counter_alloc()/counter_add().
- */
- bool legacy_device;
};

void *counter_priv(const struct counter_device *const counter);

-int counter_register(struct counter_device *const counter);
-
struct counter_device *counter_alloc(size_t sizeof_priv);
void counter_put(struct counter_device *const counter);
int counter_add(struct counter_device *const counter);

void counter_unregister(struct counter_device *const counter);
-int devm_counter_register(struct device *dev,
- struct counter_device *const counter);
struct counter_device *devm_counter_alloc(struct device *dev,
size_t sizeof_priv);
int devm_counter_add(struct device *dev,
--
2.34.1