counter: remove old and now unused registration API

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>
Link: https://lore.kernel.org/r/20211230150300.72196-24-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
index b3fa15b..7e0957e 100644 (file)
--- 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 = {
@@ -67,77 +66,14 @@ 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 ed8d582..1fe17f5 100644 (file)
--- 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,